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PHYSICS (538 journals)            First | 1 2 3 4 5 6 | Last

Journal of Sol-Gel Science and Technology     Hybrid Journal   (Followers: 2)
Journal of Solid State Lighting     Open Access  
Journal of Solid State Physics     Open Access  
Journal of Spectroscopy     Full-text available via subscription  
Journal of Superconductivity and Novel Magnetism     Partially Free   (Followers: 1)
Journal of Synchrotron Radiation     Hybrid Journal   (Followers: 1)
Journal of Testing and Evaluation     Full-text available via subscription   (Followers: 9)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 16)
Journal of the Brazilian Society of Mechanical Sciences     Open Access   (Followers: 1)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free   (Followers: 1)
Journal of Theoretical and Applied Physics     Open Access   (Followers: 1)
Journal of Tissue Engineering     Open Access   (Followers: 4)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 3)
Journal of Vibration and Control     Hybrid Journal   (Followers: 13)
Journal of Visualization     Hybrid Journal   (Followers: 2)
Journal of Zhejiang University SCIENCE A     Hybrid Journal  
Jurnal Penelitian Sains (JPS)     Open Access  
Language Learning Journal     Hybrid Journal   (Followers: 10)
Lasers in Surgery and Medicine     Hybrid Journal  
Latvian Journal of Physics and Technical Sciences     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Les Houches Summer School Proceedings     Full-text available via subscription  
Letters in Mathematical Physics     Hybrid Journal   (Followers: 3)
Light : Science & Applications     Open Access  
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access  
Lubrication Science     Hybrid Journal  
Macalester Journal of Physics and Astronomy     Open Access  
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 2)
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 1)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 1)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 16)
Matéria (Rio de Janeiro)     Open Access   (Followers: 1)
Materials & Design     Hybrid Journal   (Followers: 21)
Materials at High Temperatures     Full-text available via subscription   (Followers: 4)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 11)
Materials Research     Open Access   (Followers: 7)
Materials Research Bulletin     Hybrid Journal   (Followers: 16)
Materials Science     Hybrid Journal   (Followers: 7)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 31)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 15)
Materials Science and Engineering: C     Hybrid Journal   (Followers: 14)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 10)
Matériaux & Techniques     Full-text available via subscription   (Followers: 1)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 1)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 2)
Meccanica     Hybrid Journal   (Followers: 1)
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 3)
Mechanics of Materials     Hybrid Journal   (Followers: 12)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 1)
Mechanics Research Communications     Hybrid Journal   (Followers: 2)
Metamaterials     Hybrid Journal   (Followers: 2)
Micro and Nano Systems Letters     Open Access   (Followers: 1)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 9)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 3)
Modern Instrumentation     Open Access   (Followers: 3)
Modern Physics Letters A     Hybrid Journal   (Followers: 1)
Modern Physics Letters B     Hybrid Journal  
Molecular Diversity     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Multibody System Dynamics     Hybrid Journal  
NANO     Hybrid Journal   (Followers: 6)
Nano Letters     Full-text available via subscription   (Followers: 42)
Nano Reviews     Open Access   (Followers: 15)
Nanoscale and Microscale Thermophysical Engineering     Hybrid Journal   (Followers: 3)
Nanoscale Research Letters     Open Access   (Followers: 4)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 13)
Natural Science     Open Access   (Followers: 9)
Nature Communications     Hybrid Journal   (Followers: 40)
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Nature Physics     Full-text available via subscription   (Followers: 23)
NDT & E International     Hybrid Journal   (Followers: 10)
NEUTRINO     Open Access  
Neutron News     Hybrid Journal  
New Journal of Physics     Open Access   (Followers: 7)
Niels Bohr Collected Works     Full-text available via subscription  
Noise & Vibration Worldwide     Full-text available via subscription   (Followers: 5)
Noise Notes     Full-text available via subscription   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 3)
Nonlinear Dynamics     Hybrid Journal   (Followers: 5)
NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin     Hybrid Journal   (Followers: 4)
Nuclear Engineering and Design     Hybrid Journal   (Followers: 11)
Nuclear Medicine and Biology     Hybrid Journal   (Followers: 1)
Nuclear Receptor     Full-text available via subscription   (Followers: 1)
Open Journal of Biophysics     Open Access   (Followers: 1)
Open Journal of Fluid Dynamics     Open Access   (Followers: 3)
Open Journal of Microphysics     Open Access  
Optical Communications and Networking, IEEE/OSA Journal of     Hybrid Journal   (Followers: 3)
Organic Electronics     Hybrid Journal   (Followers: 3)
PAJ: A Journal of Performance and Art     Hybrid Journal   (Followers: 11)
Particle Physics Insights     Open Access   (Followers: 2)
Particuology     Hybrid Journal  
Pattern Recognition in Physics     Open Access   (Followers: 1)
Pergamon Materials Series     Full-text available via subscription  
Phase Transitions and Critical Phenomena     Full-text available via subscription   (Followers: 1)
Philosophical Magazine     Hybrid Journal   (Followers: 2)
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences     Full-text available via subscription   (Followers: 5)
Philosophy and Foundations of Physics     Full-text available via subscription  

  First | 1 2 3 4 5 6 | Last

Journal Cover Microporous and Mesoporous Materials
   Journal TOC RSS feeds Export to Zotero [5 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1387-1811
     Published by Elsevier Homepage  [2563 journals]   [SJR: 1.306]   [H-I: 93]
  • Adsorption of aniline on template-synthesized porous carbons
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Lina Zuo , Wenzhe Song , Taihong Shi , Can Lv , Juan Yao , JinFeng Liu , Yinghong Weng
      The aniline in aqueous solutions is harmful to both human health and the environment. A new synthetic, the templated porous carbon, was designed and studied in this study to adsorb the aniline from aqueous solutions. The templated porous carbon was synthesized by SBA-15 and natural zeolite and characterized by SEM/TEM /FTIR and N2 sorption/desorption isotherm analysis. The results indicated that the adsorption of aniline followed pseudo-second-order kinetic model and was well fit using the Freundlich isotherm model. The adsorption capacity was influenced by the pore structure and pH. The adsorption–desorption cycles were also investigated in this study, and the results suggested the template-synthesized porous carbon would be a promising adsorbent for the removal of aniline from aqueous solution.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Ionic liquid-assisted growth of Cu3(BTC)2 nanocrystals on graphene oxide
           sheets: Towards both high capacity and high rate for CO2 adsorption
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Zijun Bian , Xiang Zhu , Tian Jin , Jie Gao , Jun Hu , Honglai Liu
      Hierarchical porous metal organic framework (MOF) composites are highly demanded because they can keep the high activity and good transport property simultaneously. A novel method of ionic liquid-assisted growth of Cu3(BTC)2 on graphene oxide (GO) sheets was proposed and applied to improve both CO2 adsorption capacity and adsorption rate. Three ionic liquids (ILs) of triethylene tetramine acetate (TETA-Ac), triethylene tetramine tetrafluoroborate (TETA-BF4) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) were used to investigate the effects of cations and anions of ILs on the structure of GO-IL/MOF composite. With amine or imidazole cations adsorbed at the surface of GO and the contrary anions closely attached, GO-ILs can provide a lot of active sites for the absorption of Cu2+ cations through the coordination. Just like a bridge, ILs assisted the initial growth of the first seed layer of Cu3(BTC)2 on the surface of GO. Among various GO-IL/MOF composites, GO-TAc/MOF-60 sample showed a superimposed structure, which lead to more accessible adsorption activity sites and shorten the transfer distance. Also, the GO sheets in GO-IL/MOF provide channels for faster transfer. It showed a high CO2 adsorption capability of 5.62mmol/g at 25°C and 100kPa, and a high CO2 kinetic separation performance as well. More importantly, the composite presented a quite good cyclic adsorption/desorption stability. The relations between the specific structures of the composites and the CO2 adsorption behaviors were tentatively demonstrated to reveal a convenient way for designing and fabricating hierarchical MOF composites.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Facile synthesis of novel flowerlike magnetic mesoporous carbon for
           efficient chlorophenols removal
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Shuangliu Liu , Sheng Li , Hongyun Niu , Tao Zeng , Yaqi Cai , Chunhong Shi , Beihai Zhou , Fengchang Wu , Xiaoli Zhao
      We present here a novel, low cost and environmental-friendly synthetic strategy for fabricating flowerlike magnetic mesoporous carbon (MMC) microspheres by using silica coated Fe3O4 as core, anisotropic layered double hydroxide (LDH) nanocrystals as hard template and dopamine as carbon source, respectively. The resulting MMC spheres has high surface areas (90.3m2 g− 1), excellent magnetic response (16.99emug− 1), and large mesopore volume (0.22cm3 g− 1), as well as good chemical inertness and mechanical stability. The MMC spheres were used to adsorb 2,4,6-trichlorophenol (TCP) from simulated water samples. Experiment results suggest that the adsorption was favorable at acidic pH and increased with the rise of initial TCP concentration and temperature. Kinetic parameters were proved to follow the pseudo-second-order kinetics model and the equilibrium data was more favorable for Freundlich isotherm. The equilibrium absorption capacity was 210mgg− 1 at initial TCP concentration of 20mgL− 1 and increased to 587mgg− 1 when the initial TCP concentration was up to 100mgL− 1, which was much higher than those of other carbon-based adsorbents reported in literature. To the best of our knowledge, this is the first report on the synthesis of flowerlike MMC material by using LDH as template and its application as adsorbent to remove TCP.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Nature of the active sites in Al-MCM-41 nano-structured catalysts for the
           selective rearrangement of cyclohexanone oxime toward ɛ-caprolactam
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Eliana G. Vaschetto , Gina A. Pecchi , Sandra G. Casuscelli , Griselda A. Eimer
      Al-MCM-41 type nano-structured catalysts with different Al contents were prepared by direct hydrothermal synthesis. All the materials were characterized by XRD, N2 adsorption, TEM, SEM, ICP-OES, FT-IR and adsorption of pyridine coupled to FT-IR spectroscopy. The relationship between the Al contents in the synthesis gel and final solid, the degree of Al introduction in tetrahedral coordination into the framework, the formation of nest silanols and the relative density of the acidic hydroxyl sites has been exhaustively analyzed. We could corroborate that hydroxyl groups present in silanol nests are the direct responsible of the weakly acid character of our materials. Moreover, a critical concentration of framework Al seems to be necessary to generate such nests, after which the acid sites density is strongly increased, according the framework Al amount increasing. The enhancement in the density of acidic nest silanols (active sites for the selective rearrangement of cyclohexanone oxime toward ɛ-caprolactam) reached by increasing the Al content, permitted to us achieve a cyclohexanone oxime conversion about 66%. The ɛ-caprolactam selectivity was 100% for all the evaluated catalysts, indicating that the acidic strength was kept sufficiently weak to not catalyze the formation of by-products.
      Graphical abstract image Highlights

      PubDate: 2014-09-16T08:46:02Z
       
  • Influence of porosity and methyl doping inside silica network: An electron
           diffraction and DFTB analysis
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Pradeep K. Singh , Jan M. Knaup , Sven Zimmermann , Steffen Schulze , Stefan E. Schulz , Thomas Frauenheim , Michael Hietschold
      The continuous scaling of transistor size towards deep submicron level demands an inevitable replacement of SiO2 with a low-k dielectric material. Doping of methyl groups in SiO2 network reduces the dielectric constant by replacing oxygen atoms bonded with silicon and creating a lower polarizable silicon methyl bond in the network. Further reduction in dielectric constant is possible by introducing porosity in the dense low-k network. The detailed knowledge about atomic structure of such low-k materials is a must for understanding their electronic and optical properties. In this study, electron diffraction and (density functional based tight binding) DFTB calculations are used to investigate the structure of dense and porous low-k dielectric materials. The radial distribution function (RDF) obtained from electron diffraction technique contains information about the short-range order present in the material. Bond lengths and bond angles determined from RDF indicate a significant modification occurring in the SiO2 network after doping with methyl groups. The local density of the materials is also derived from radial distribution function. It depends on the number and distances of nearest neighbors and was found to be decreased in these low-k materials compared with amorphous SiO2.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Synthesis of mesostructured indium oxide doped with rare earth metals for
           gas detection
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Haifeng Yang , Xuan Zhang , Junfang Li , Wentao Li , Guangcheng Xi , Yan Yan , Hua Bai
      Utilizing an improved one-step nanocasting method, ordered mesostructured In2O3 doped with different rare earth metals was synthesized. The obtained materials showed tunable doping ratios and ordered pore structure with high surface area, which led to remarkable sensitivity and selectivity for NH3 gas.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Periodic Mesoporous Organosilicas as adsorbents for the organic pollutants
           removal in aqueous phase
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Soliu O. Ganiyu , Cláudia Bispo , Nicolas Bion , Paula Ferreira , Isabelle Batonneau-Gener
      Heavy organic pollutants such as pesticides and pharmaceuticals are found in wastewater and are difficult to remove by microporous adsorbents because of their large size. Mesoporous organosilicas as potential adsorbents for removal of heavy organic pollutants from aqueous phase are investigated. Propylsulfonic acid-functionalized mesoporous silica (SBA-15-SO3H) and propylsulfonic acid-functionalized periodic mesoporous benzene-silica (Ph-PMO-SO3H) are prepared by co-condensation method. Textural and structural characterizations are conducted by X-ray diffraction, N2 physisorption, solid state NMR spectroscopy, elemental analysis and confirmed the structural integrity of the materials. Material adsorption behaviors are studied in pesticide, mesosulfuron methyl (MM), removal from aqueous phase. For all the materials, adsorption kinetics are well described by a pseudo-second order model indicating the chemisorption of the MM molecules via acid–basic interaction of the neutral form. Sorption isotherms are S-shape isotherms and can be well fitted by the Freundlich model. Ph-PMO-SO3H exhibits higher sorption rate (8.95mgg−1 h−1) and better sorption capacity (9.70mgg−1) than the mesoporous silica SBA-15-SO3H (4.16mgg−1 h−1, 9.4mgg−1). Furthermore, Ph-PMO-SO3H has also the best MM abatement rates in aqueous phase up to 95% for initial concentrations ranging from 4 to 10ppm than microporous acidic zeolite (HFAU) (∼70%) and mesoporous silica SBA-15-SO3H (∼70%). The phenyl groups in sulfonic PMO material seem to enhance organic pollutant adsorption capacity either by reducing wall hydrophilicity or by favoring the interaction with MM phenyl rings.
      Graphical abstract image Highlights

      PubDate: 2014-09-16T08:46:02Z
       
  • The synthesis of aluminophosphate and germanosilicate LTA using a
           triquaternary structure directing agent
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Joel E. Schmidt , Stacey I. Zones , Dan Xie , Mark E. Davis
      The use of triquaternary organic structure directing agents (OSDAs) for the synthesis of microporous materials is relatively unexplored. Here a triquaternary OSDA prepared by reacting 1,2-dimethylimidazole with 1,3,5-tris(bromomethyl)benzene promotes the formation of LTA in the aluminophosphate or germanosilicate reaction chemistries.
      Graphical abstract image Highlights

      PubDate: 2014-09-16T08:46:02Z
       
  • Hydrophobically modified spherical MCM-41 as nanovalve system for
           controlled drug delivery
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Aneesh Mathew , Surendran Parambadath , Sung Soo Park , Chang-Sik Ha
      Spherical MCM-41 nanovalve having hydrophobically modified pore channels was synthesized via surfactant assisted sol–gel methodology and post modification process. The spherical MCM-41 has been tailored as a smart pH responsive drug carrier system by the insertion of N-3-(trimethoxysilyl)propyl aniline (TMSPA) at the pore opening before extracting the surfactant and further with phenyltrimethoxysilane (PTMS) to impart hydrophobicity on the inner surfaces of the pore channels. The surfactant extracted MCM-41 exhibits excellent textural properties such as very high specific surface area (1307 m2 g−1), pore diameter (24 Å) and pore volume (0.65 cm3 g−1). The transmission electron microscope (TEM) and scanning electron microscope (SEM) images of mesosphere reflect the highly uniform and mono-dispersed spherical morphology having a particle size of 500nm. 5-Fluorouracil (5-Fu) and famotidine have been loaded into the hydrophobically modified channels followed with β-cyclodextrin (β-CD) as the gatekeeper to make the material as a pH responsive drug delivery system. The drug delivery has been carried out under in vitro condition at pH 4 and the amount of drug released from the nanovalve system was monitored by UV–Vis spectroscopy under regular intervals. The hydrophobically modified nanovalve was found to have delayed drug release of both 5-Fu and famotidine in comparison to the drug delivery from the nanovalve having unmodified pore channels synthesized from spherical MCM-41 under similar experimental conditions. The significance of functionalization as well as capping has been verified by the comparison of drug delivery behaviors among hydrophobically modified, unmodified, β-CD capped and uncapped nanocontainers.
      Graphical abstract image

      PubDate: 2014-09-16T08:46:02Z
       
  • Gas and liquid permeability in nano composites gels: Comparison of Knudsen
           and Klinkenberg correction factors
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Liz Anez , Sylvie Calas-Etienne , Juan Primera , Thierry Woignier
      We measured gas and water permeability in sets of nano-composite silica gels, (silica gel network with aerosil particles), which are highly porous but low permeability materials. Experimental results showed that gas and liquid permeability increased with aerosil content, allowing control of transport properties. Our results also showed that gas permeability was more than one order of magnitude higher than water permeability. This difference was analysed in view of the gas slippage effect. To this end, we tested and compared different correction factor models (Knudsen and Klinkenberg correction factors) proposed in the literature. We showed that the Klinkenberg factor increases with porosity, and discuss the effect of tortuosity. Models that account for porosity and tortuosity improve the accuracy of the prediction. The Knudsen correction increased the accuracy of the experimental data and made it possible to extrapolate the intrinsic permeability from the gas permeability with quite reasonable accuracy.
      Graphical abstract image

      PubDate: 2014-09-12T08:40:07Z
       
  • Synthesis of CuNi and CuNi/SBA-15 by aqueous method at room temperature
           and their catalytic activity
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): P. Hari Krishna Charan , G. Ranga Rao
      Here we report the room temperature synthesis of stable CuNi bimetallic alloy particles under aqueous conditions using cetyltrimethylammonium bromide surfactant and hydrazine hydrate as a reducing agent. The bimetallic particles are formed in situ by the reduction of Ni2+ ions to Ni0 by hydrazine. No additional base is added to maintain the pH of the aqueous solution during the synthesis. The reduction process is favoured by Cu nuclei which formed initially. Metallic Cu nuclei assist the growth of CuNi alloy particles of all compositions with nickel-rich kernel phases. The oxidation and hydrogen uptake behaviour of the CuNi particles are found to differ significantly due to the size and intrinsic variations in composition. CuNi particles are also embedded in SBA-15 matrix by similar co-reduction method. The catalytic properties of pristine and SBA-15 grafted CuNi bimetallic systems are studied by p-nitrophenol reduction.
      Graphical abstract image Highlights

      PubDate: 2014-09-12T08:40:07Z
       
  • Preparation, characterization and electrochemical properties of porous
           NiO/NPC composite nanosheets
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Yanli Tan , Qiuming Gao , Weiqian Tian , Yunlu Zhang , Jiandong Xu
      We present a facile combined hydrothermal and calcination method to prepare porous nickel oxide/nanoporous carbon (NiO/NPC) composite nanosheets. The material is characterized by powder X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM) and high-resolution TEM (HRTEM), X-ray photoelectron spectrometer (XPS), as well as N2 sorption analyses. Cyclic voltammetry (CV) and galvanostatic charge–discharge tests are performed and indicate that the NiO/NPC possesses superior pseudocapacitive performance with the specific capacitance value of 1337Fg−1 at the current density of 2Ag−1 using as the electrode material. The specific capacitance value of 457Ag−1 can be obtained at the high current density of 10Ag−1 showing its high rate performance. The material exhibits good cycling stability by retaining 95% of the max capacitance after 500 cycles of continuous charge–discharge processes. Adding NPC in the synthetic process not only changes the elemental composition, but also leads to more Ni3+ ions and abundant pores in the texture of the NiO/NPC material, which provides high electron conductivity and fast ion transport, enhances the rate performance of the NiO/NPC electrode, and stabilizes the active material.
      Graphical abstract image

      PubDate: 2014-09-12T08:40:07Z
       
  • Changes of medium-range structure in the course of crystallization of
           zeolite omega from magadiite
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Miao Cui , Yifu Zhang , Xiaoyu Liu , Lin Wang , Changgong Meng
      Changes of medium-range structure during the crystallization of zeolite omega from magadiite were characterized. It is found that although the long-range order of magadiite is collapsed in the initial stage, parts of 5-member rings and 6-member rings are still preserved as secondary building units. The fraction of 5-member rings and 6-member rings increases as the crystallization progresses. The 4-member ring chains are formed at a stage later than that of 5-member rings and 6-member rings.
      Graphical abstract image

      PubDate: 2014-09-12T08:40:07Z
       
  • Outside back cover (contents)
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199




      PubDate: 2014-09-06T08:19:33Z
       
  • Editorial Board
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199




      PubDate: 2014-09-06T08:19:33Z
       
  • Effect of microwaves, ultrasounds and interlayer anion on the
           hydrocalumites synthesis
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Judith Granados-Reyes , Pilar Salagre , Yolanda Cesteros
      Several hydrocalumites were precipitated from nitrate or chloride salts with and without ultrasounds, and aged hydrothermally in autoclave or by refluxing with and without microwaves. The use of ultrasounds during coprecipitation led to more crystalline hydrocalumites whereas the use of autoclave and microwaves during aging, favoured the formation of a secondary phase, katoite, in addition to hydrocalumite. The presence of katoite affected the crystallization of hydrocalumite. Hydrocalumites with nitrates as interlayer anions were slightly less crystalline than those prepared with chloride anions. Additionally, the synthesis with nitrates resulted in the formation of higher amounts of katoite in autoclave conditions. Hydrocalumites exhibited thin regular hexagonal layers, as observed by SEM and TEM, with lower particle size for the samples aged with microwaves. Interestingly, the hydrocalumite prepared from nitrates by coprecipitation in ultrasounds and aged under microwaves resulted in the highest surface area measured (25m2/g) according to the additional mesoporosity observed by N2 physisorption.
      Graphical abstract image Highlights

      PubDate: 2014-09-06T08:19:33Z
       
  • Introducing a self-consistent test and the corresponding modification in
           the Barrett, Joyner and Halenda method for pore-size determination
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Jhonny Villarroel-Rocha , Deicy Barrera , Karim Sapag
      A standard method to obtain the mesopore size distribution of adsorbents is the Barrett, Joyner and Halenda (BJH) analysis of the N2 adsorption–desorption isotherm at 77K. The availability, over the last two decades, of well-defined model adsorbents in the mesopore range, together with other forms of isotherm analysis with the help of the Density Functional Theory (DFT) has shown that the BJH method tended to underestimate the pore-width when they are smaller than 10nm. Regarding this fact, we have reported an improved BJH method, where we have remarked that the reconstruction of the adsorption–desorption isotherm from the BJH results leads to some inconsistency. We therefore proposed a simple means to cancel the mentioned discrepancy and inconsistency. This correction can be made by simply adding a corrective term to the standard BJH equation, which value is selected to meet a self-consistent criterion, i.e. the reconstructed isotherm should fit the original one. In the first article, the method was applied for some ordered mesoporous materials (OMM) synthesized in our laboratory, showing only the results without major details. In this work, we validate the test for other samples, in other pore size ranges, introducing some remarks in theoretical aspects and in the importance of obtaining and taking into account the micropore volume. Finally, a detailed procedure to apply the proposal method using only the experimental data of the analysis is presented.
      Graphical abstract image

      PubDate: 2014-09-06T08:19:33Z
       
  • Hydrothermal conversion of Fe2O3/SiO2 spheres into Fe2O3/Silicalite-1
           nanowires: Synthesis, characterization, and catalytic properties
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Pengfei Xie , Lifeng Chen , Zhen Ma , Chengyun Huang , Zhiwei Huang , Yinghong Yue , Weiming Hua , Yi Tang , Zi Gao
      Fe2O3 nanoparticles were dispersed onto SiO2 by impregnating amorphous SiO2 spheres with Fe(NO3)3 followed by spray drying and calcination. Interestingly, the amorphous SiO2 spheres in the sample could be converted into Silicalite-1 nanowires after being hydrothermally treated in the presence of a mixture of ethylenediamine and triethylamine (dual templates) for over 4days, whereas the Fe2O3 nanoparticles were still highly dispersed on the formed Silicalite-1 nanowires. Meanwhile, a fraction of Fe(III) species entered the zeolitic framework. Relevant characterization was conducted using X-ray fluorescence (XRF), N2 adsorption–desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet–visible (UV–Vis) spectroscopy, electron paramagnetic resonance (ESR), X-ray photoelectron spectroscopy (XPS), and H2-temperature-programmed reduction (H2-TPR). The catalytic properties of the samples were studied using CO oxidation, N2O decomposition, and selective reduction of NO as probe reactions.
      Graphical abstract image

      PubDate: 2014-09-06T08:19:33Z
       
  • A nickel foam supported copper core/nickel oxide shell composite for
           supercapacitor applications
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): J.L. Yin , J.Y. Park
      Micro porous and branched copper/nickel oxide composite with novel core–shell structure was fabricated on the nickel foam by using two consecutive electroplating processes and normally used electrochemical oxidation process. Nickel foam was used as the current collector to deposit more electroactive material, and it also helped to rapidly disperse hydrogen bubbles generated during the copper electroplating process. Field emission-scanning electronic microscopy (FE-SEM) images showed that mesoporous NiO wrinkles with lateral sizes of tens of nm were well grown and dispersed on the surface of 3-dimensional copper core. The electrochemical measurements of the as prepared Ni foam/Cu/NiO composite were performed to determine its performances. A maximum specific capacitance of 416F/g and energy density of 11.2Wh/kg at the 3.6kW/kg were obtained, indicating its excellent ions accessibility and charge storage ability. Moreover, the developed composite material exhibited low inner resistance (0.6Ω) and good cycling performance along with 71.1% specific capacitance retained after 5000 cycles. These results reveal that the developed composite electrode could be a promising positive electrode candidate material for supercapacitor applications.
      Graphical abstract image Highlights

      PubDate: 2014-09-06T08:19:33Z
       
  • Dual-responsive drug delivery system with real time tunable release
           behavior
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Fang Li , Yingchun Zhu , Yunli Wang
      A dual-responsive drug delivery system (DDS) was successfully established by coating functional macromolecules onto the outlets of mesoporous silica nanospheres. Electro-sensitive and thermally responsive units were copolymerized into the macromolecular networks to control the drug release under different circumstances. The simulated drug delivery experiments conducted in vitro revealed that the drug release rate could be regulated continuously and remotely by one or both stimuli sources. The drug release rate under 0.5Hz alternating electric field was almost twice as much as that without an alternating electric field. This combination of electro-responsive function and temperature sensitive characteristics could lead to a real time tunable drug delivery system with wide application area.
      Graphical abstract image Highlights Electro- and thermo-responsive drug release (DFMS) system for real time tunable drug delivery application.

      PubDate: 2014-09-06T08:19:33Z
       
  • Deblocking effect of carbonates and hydrogen carbonates in the alkali form
           zeolites with narrow pores
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): A.V. Larin
      The alkali forms of MeRHO zeolite (Me=Li, Na, K, Cs) are studied theoretically at the DFT/PBE level using projector augmented wave method (PAW) and periodic boundary conditions (PBC). The equilibrium positions of the Me cations have been optimized at the D8R prisms where they control molecular transport in the pores of MeRHO. The effect of the displacement of alkali cations has been estimated due to coordination of both carbonate or hydrogen carbonate anions that can also induce RHO framework transformations. Admitting the CO3 −2 and HCO3 − formations via the reactions between H2O and CO2, the energy of respective reactions was evaluated at various Si/Al moduli and analyzed regarding possible influence on the gas adsorption.
      Graphical abstract image Highlights

      PubDate: 2014-09-06T08:19:33Z
       
  • MnO2 nanowires in situ grown on diatomite: Highly efficient absorbents for
           the removal of Cr(VI) and As(V)
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Yucheng Du , Guangwei Zheng , Jinshu Wang , Liping Wang , Junshu Wu , Hongxing Dai
      The MnO2 nanowires-deposited diatomite samples were prepared using the hydrothermal method with KMnO4 and (NH4)2S2O8. Physicochemical properties of the samples were characterized by means of numerous techniques, and their efficiency for the removal of Cr(VI) and As(V) was determined. The parameters, such as pH value, adsorption time, adsorbent mass, and initial Cr(VI) or As(V) concentration, could influence the Cr(VI) and As(V) removal efficiency or adsorption capacity of the MnO2 nanowires/diatomite sample obtained after hydrothermal treatment at 90°C for 12h. These MnO2 nanowires/diatomite samples showed high surface areas and superb Cr(VI) and As(V) adsorption behaviors, with the maximum Cr(VI) and As(V) adsorption capacities being 197.6 and 108.2mg/g, respectively. The Cr(VI) and As(V) adsorption mechanisms of the samples were also discussed.
      Graphical abstract image

      PubDate: 2014-09-06T08:19:33Z
       
  • Adsorption of volatile hydrocarbons in iron polysulfide chalcogels
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Ejaz Ahmed , Alexander Rothenberger
      We report the synthesis, characterization and possible applications of three new metal-chalcogenide aerogels KFe3Co3S21, KFe3Y3S22 and KFe3Eu3S22. Metal acetates react with the alkali metal polychalcogenides in formamide/water mixture to form extended polymeric frameworks that exhibit gelation phenomena. Amorphous aerogels obtained after supercritical CO2 drying have BET surface area from 461 to 573m2/g. Electron microscopy images and nitrogen adsorption measurements showed that pore sizes are found in micro (below 2nm), meso (2–50nm), and macro (above 50nm) porous regions. These chalcogels possess optical bandgaps in the range of 1.55–2.70eV. These aerogels have been studied for the adsorption of volatile hydrocarbons and gases. A much higher adsorption of toluene in comparison with cyclohexane and cyclopentane vapors have been observed. The adsorption capacities of the three volatile hydrocarbons are found in the following order: toluene>cyclohexane>cyclopentane. It has been observed that high selectivity in adsorption is feasible with high-surface-area metal chalcogenides. Similarly, almost an eight to ten times increase in adsorption selectivity towards CO2 over H2/CH4 was observed in the aerogels. Moreover, reversible ion-exchange properties for K+/Cs+ ions have also been demonstrated.
      Graphical abstract image Highlights

      PubDate: 2014-09-01T08:05:22Z
       
  • Methoxylation of α-pinene over mesoporous carbons and microporous
           carbons: A comparative study
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Inês Matos , Marta F. Silva , Ramiro Ruiz-Rosas , Joaquim Vital , José Rodríguez-Mirasol , T. Cordero , José E. Castanheiro , Isabel M. Fonseca
      A biomass derived carbon, a commercial microporous carbon and a xerogel mesoporous carbon catalysts were used in the study of α-pinene methoxilation reaction and the influence of textural and physical–chemical properties of the carbons was evaluated. Biomass carbon presented the higher activity, whereas the commercial one is the less active in the conditions studied. The main product of the reaction was α-terpinyl methyl ether and good values of selectivity were obtained over all the catalysts. A kinetic model was developed assuming that the α-pinene is consumed according to the parallel reaction network. The kinetic model presents high quality fittings to the experimental concentration profiles. These results show that it is possible to activate a waste residue using H3PO4 and convert it to high added value product such as acid catalyst.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Immobilization of laccase on hairy polymer grafted zeolite particles:
           Degradation of a model dye and product analysis with MALDI–ToF-MS
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Omur Celikbicak , Gulay Bayramoglu , Meltem Yılmaz , Gozde Ersoy , Niyazi Bicak , Bekir Salih , M. Yakup Arica
      Poly(2-chloroethyl acrylate), p(CEA), as a functional polymer was grafted via surface initiated atom transfer radical polymerization (SI-ATRP) on zeolite particles. The p(CEA) grafted zeolite particles were aminated, and a ligninolytic enzyme “laccase” from Trametes versicolor was covalently immobilized on the composite particles via glutaraldehyde coupling. The amount of immobilized laccase on the zeolite-g-p(CEA) particles was determined as 17.7mgg−1 particles. The degradation of a model dye (i.e., Reactive Red 120; RR-120) with the free and immobilized laccases was evaluated in batch and continuous systems. The covalently immobilized laccase showed a high decolorization efficiency toward RR-120 in aqueous solution compared to the free counterpart. The resulting dye degradation products were analyzed by matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI–ToF-MS).
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Editorial Board
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198




      PubDate: 2014-09-01T08:05:22Z
       
  • Enhanced desulfurization characteristics of Cu-KIT-6 for thiophene
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Fazle Subhan , Sobia Aslam , Zifeng Yan , Muhammad Ikram , Sadia Rehman
      Mesoporous KIT-6 molecular sieves containing Cu (Cu-KIT-6) to the extent of 5 to 15wt% were synthesized by ultrasound assisted incipient wetness impregnation (IWI) for the first time and used as the adsorbents for desulfurization of model fuel at a temperature range of 30–90°C. The sorbents were characterized by XRD, N2 adsorption, TPR, FT-IR HRTEM, SEM and XPS techniques. The result revealed that Cu-KIT-6 adsorbent with a copper content up to 10wt% can still retain the uniform mesoporous framework of KIT-6 and the proposed ultrasonic method gives highest Cu dispersion without segregation than impregnated method, which improved significantly the adsorptive desulfurization performance of the sorbents. The adsorption capacities of the sorbents at 70°C follow the order 10 Cu-KIT-6 (33.5mg-S/g)>5 Cu-KIT-6 (31.1mg-S/g)>10 Cu/KIT-6 (26.3mg-S/g)>15 Cu-KIT-6 (19.5mg-S/g)>(0.5mg-S/g) KIT-6. Moreover, the experimental equilibrium data have been analyzed using the linearized form of Langmuir and Freundlich isotherms and the Langmuir isotherm was found to provide the best theoretical correlation of the experimental data for the adsorption of thiophene.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Hydrothermal synthesis of high purity zeolite A from natural kaolin
           without calcination
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Jing-Quan Wang , Ya-Xi Huang , Yuanming Pan , Jin-Xiao Mi
      Zeolite A is a commercially and environmentally important microporous material, which is commonly synthesized from calcined kaolin. One major drawback inherent to this approach is that the properties (i.e., purity, particle size, morphology, and cation-exchange capacity) of the final product depend largely on the quality of the raw kaolin ores. Herein we report on a new hydrothermal route for the synthesis of high purity zeolite A with controllable particle size and morphology, from natural kaolin without conventional high temperature calcination. This route starts with hydrothermal reaction of natural kaolin with NaOH to form hydrous sodium aluminosilicates (i.e. hydroxycancrinite and nepheline hydrate), which are then dissolved in dilute HCl. The resulting acid solution, after filtration to remove unreacted impurity minerals such as quartz and muscovite, is then adjusted to pH=7 to form an amorphous Si and Al gel, which is used for the hydrothermal synthesis of zeolite A. A comparative study of zeolite A samples synthesized from this new route and those from the conventional calcination method reveals that the former have more controllable size and morphology than the latter, giving rise to higher brightness and enhanced cation-exchange capacity. Another major advantage of this new method is that the common impurity minerals such as quartz, muscovite and feldspars in natural kaolin can be removed, giving rise to high purity zeolite A and possibly expanding this technique to the use of low-grade kaolin.
      Graphical abstract image Highlights A new hydrothermal route has been developed for the synthesis of high purity zeolite A with controllable particle size and morphology, from natural kaolin without high temperature calcination.

      PubDate: 2014-09-01T08:05:22Z
       
  • Versatile drug releaser derived from the Ti-substituted mesoporous silica
           SBA-15
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Mi Mi Wan , Xiao Dan Sun , Shuai Liu , Jing Ma , Jian Hua Zhu
      Multiple modification of SBA-15 in its electrostatic and geometric properties was simultaneously performed by titanium substitution in the framework of mesoporous silica, in order to fabricate versatile drug releaser based on the Ti-SBA-15 with subtle “critical state”. The SBA-15 with proper Ti-content, no more than 4.2μmolg−1 without formation of TiO2, was synthesized via special hydrothermal conditions with assistance of fluorine ion, and the resulting composite had the appropriately distorted mesoporous structure provided the Si/Ti of initial gel no less than 50, plus the lowered surface negative charge (Zeta-potential). The controlled Ti-substitution enabled SBA-15 to be more active in adsorbing negative charged drug like heparin, especially in dilute solution. Also, sustained heparin release was achieved on the Ti-SBA-15 with a little initial burst. Ti-substitution also improved the loading and release of small drug such as ibuprofen on SBA-15, compensating the lack of fine geometric confinement in mesoporous silica. Moreover, liquid adsorption of probes with different negative charge and molecular size, including heparin, ibuprofen and volatile nitrosamines N-nitrosopyrrolidine was investigated to explore the influence of Ti-substitution on the electrostatic attraction and structural distortion of SBA-15, offering a tool to characterize the mesoporous materials and providing a valuable clue for design of new drug releaser.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Superhydrophobic hybrid aerogel powders from waterglass with distinctive
           applications
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Maria de Fátima Júlio , Laura M. Ilharco
      Hybrid silica aerogel powders with enhanced superhydrophobicity and very high reaction yield were prepared by a fast co-precursor method at ambient pressure. An inexpensive aqueous sodium silicate solution was used as starting material (waterglass or WG), with hexamethyldisilazane (HMDZ) as organic co-precursor. The key for successfully achieving such high yields and superhydrophobicity was a systematic tuning of the synthesis parameters (co-precursors and acid catalyst molar ratios) and process conditions (stirring speed, stirring period, aging, washing and drying steps), in close correlation with the reaction mechanism. Using a minimum amount of organic co-precursor, a total yield of ∼80% in hybrid aerogels with high lipophilic/hydrophilic ratio, very high water contact angles (∼152±2°) and very low densities (∼0.120gcm−3) were obtained. The optimized synthesis conditions consist in HNO3:WG:HMDZ molar ratios of 1.5:1.0:1.5, stirring speed of 120rpm, only during addition of the catalyst and co-precursor, aging for 5min and washing with water before drying at atmospheric pressure. The minimization of the only costly precursor allows envisaging a low-cost large scale production and, moreover, the encapsulation of water droplets within aerogel powder allows proposing distinctive applications, such as water transport at a microscale level.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • One-step approach for synthesis of nanosized Cu-doped zeolite A crystals
           using the Cu–EDTA-complex
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Ivan Yordanov , Inna Karatchevtseva , Hubert Chevreau , Maxim Avdeev , Rohan Holmes , Gordon Thorogood , Tracey Hanley
      Copper-doped nanosized zeolite A crystals were synthesized by an in situ templating approach using [Cu(EDTA)]2−-complex. The structural properties of the copper containing zeolite crystals were characterized by a suite of different techniques including SEM–EDX, ESR, mid-IR and Far-IR, Raman, in situ XRD and non-ambient neutron powder diffraction. The SEM investigations on the morphology show spheroidal zeolite A crystals with average size ∼200nm. The asymmetric ESR spectrum shows that the Cu2+ ion is in a tetragonal-distorted octahedral crystal field. FT-IR and Raman spectroscopies provide information on coordination environment of the copper ion. The band due to stretching vibration of C–N bond, where N is coordinated to the copper ion (C–N–Cu), was observed at 1109cm−1 in the mid-infrared region. The Raman band due to the Cu–O bond is present at 630cm−1 indicating the coordination of the Cu2+-cation to COO−-group of the EDTA-ion. The XRD data shows an enlarged d-spacing between the adjacent zeolite lattice planes due to the presence of the [Cu(EDTA)]2−-complex in comparison to template-free LTA zeolite structure. LeBail fitting approach on temperature-dependent in situ X-ray and neutron diffraction profiles have demonstrated the expansion of the zeolite cell during the thermal treatment followed by subsequent contraction with the decomposition of the organic template.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Synthesis of thermally stable porous SiC hollow spheres and control of the
           shell thickness
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Seong-Cheol Noh , Seung-Young Lee , Sungrye Kim , Sungho Yoon , Yong Gon Shul , Kwang-Deog Jung
      Thermally stable SiC hollow spheres were prepared using SiO2 templates with two layers. At the calcination at higher than 1300°C, the SiC hollow sphere could be obtained. The shell thickness of the porous SiC hollow spheres can be controlled by the molar ratio of TMS/TEOS. The pore volumes and BET surface areas of the template SiO2 increased with the molar ratio of TMS/TEOS, while those of the SiC/SiO2 and SiC spheres decreased. It is evident that the pore sizes of the SiC hollow spheres were not influenced by the TMS/TEOS ratio. The wall thickness of the SiC sample increased with an increase in the TMS/TEOS mole ratio. The prepared SiC hollow spheres with the surface area higher than 770m2/g were thermally stable up to temperatures higher than 700°C.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • An novel approach to synthesize layered material PLS-4
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Zhengjia Li , Kun Jiao , Xiangyu Xu , Jiaqing Song
      A novel synthetic route to the layered material PLS-4 has been developed using amorphous silica as the silica source and ethyldimethylethanolammonium fluoride as the organic structure-directing agent. This reaction can proceed under high concentration conditions utilizing quaternary ammonium fluoride salt rather than ammonium fluoride or hydrofluoric acid. By introducing aluminum, alkali metal and alkaline earth metal into the aforementioned system, three new morphologies have been obtained. Products were fully characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption analyses.
      Graphical abstract image Highlights

      PubDate: 2014-09-01T08:05:22Z
       
  • Synthesis of 1,10-phenanthroline functionalized periodic mesoporous
           organosilicas as metal ion-responsive sensors
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Bing Xiao , Jiao Zhao , Xiao Liu , Peiyuan Wang , Qihua Yang
      The periodic mesoporous organosilicas with 1,10-phenanthroline (Phen) integrated in the framework (Phen-PMOs) were synthesized by co-condensation of tetramethoxysilane (TMOS) and the phenanthroline bridged organosilicas (Phen-Si) using triblock copolymer P123 as a template in weak acidic medium. The FT-IR, 13C CP-MAS and 29Si MAS NMR characterizations confirmed the integration of phenanthroline ligand in material. The Phen-PMOs have ordered 2-D hexagonal mesostructure though the structural order decreases with the increment in Phen content based on XRD and TEM characterizations. The hybrid materials exhibited specific surface area of 328–106m2/g and total pore volume of 0.43–0.17cm3/g. These Phen-functionalized PMOs, with strong blue fluorescent emission originated from phenanthroline group in the framework, have potential application in recognition of different metal ions, with luminescence intensity sensed to the type and concentration of the metal ions.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Study of the influence of physical–chemical properties of steamed
           H-MOR zeolites in the mechanism of adsorption of fatty acids and their
           esterification
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Luis F. Isernia
      The increasing use of fatty acid esters, on the industry and the substitution of traditional petroleum fuels, promotes the study of heterogeneous catalysts with a better environmental performance than their homogeneous counterparts. The mordenite, has attracted special attention, for its environmental friendliness, exceptional physical chemical properties and the availability of large natural deposits. In order to study the influence of its physical chemical properties over the mechanism of adsorption of fatty acids (FA) and their esterification, three new solids were obtained through hydrothermal treatment at 800–1000K of a mordenite with a Si/Al ratio of about six. The characterization by FTIR and XRD confirms the collapse of crystallinity with the increase of the treatment temperature. The partial exiting of tetrahedral aluminum out of the crystalline network, revealed by 29Si and 27Al MAS NMR leads to the diminution of the acidity and the increasing hydrophobicity, evidenced by FTIR spectroscopy and adsorption isotherms of stearic acid. The kinetic evaluation of FA esterification reveals a pseudo-second order model. These results suggest a change in the adsorption mechanism: In the original mordenite and treated at low temperatures, a higher density of acid sites favors the adsorption of the carboxyl group of FA molecules by hydrogen-bonding to the zeolite Al–OH–Si groups, while the tails adsorb on the less polar surroundings. At greater treatment temperatures, the taller hydrophobicity induces the adsorption of the FA molecules onto the lesser polar (and lesser active) sites of the zeolite with its carboxyl groups oriented away from the zeolitic surface.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Adsorption of dyes with different molecular properties on activated
           carbons prepared from lignocellulosic wastes by Taguchi method
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): G. Durán-Jiménez , V. Hernández-Montoya , M.A. Montes-Morán , A. Bonilla-Petriciolet , N.A. Rangel-Vázquez
      A design of experiments based in the Taguchi method was used to prepare activated carbons from different lignocellulosic residues with optimum properties for the removal of food and textile dyes (food yellow 4, food yellow 3, food red 17 and acid blue 74). A Taguchi L16 orthogonal array was devised for the design of experiments, using the dye removal percentage as response variable and several experimental factors, including the origin of the lignocellulosic precursor, type of chemical agent used for the impregnation of the precursors and other specific variables of the impregnation and thermal treatments. Statistical analysis of the results helped to identify the chemical agent and the final temperature of carbonization/activation as the experimental factors having the most relevant effect on the response (i.e., amount of dye adsorbed). Carbons obtained using the optimum conditions predicted by the Taguchi methodology for each dye were characterized using elemental analysis, FT-IR spectroscopy, adsorption isotherms of nitrogen at −196°C and SEM/EDX analysis. The optimum carbons had a high specific surface area (∼1400m2/g) with a considerable amount of micropores (∼50%). Mesoporosity seemed also to play an important role in the adsorption of these dyes.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Achieve to easier opening of channels in anionic nanoporous
           metal–organic framework by cation exchange process
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Zhao-Jun Li , Sarah Karbalaei Khani , Kamran Akhbari , Ali Morsali , Pascal Retailleau
      A zinc-based metal–organic framework {(HDMA)2[Zn3(BDC)4]·DMF·H2O} (1) (BDC2 − is 1,4-benzenedicarboxylate, DMF is N,N-dimethylformamide and HDMA+ is dimethylammonium), with C2/c space group, a =33.299 (3), b =9.790 (4), c =18.185 (5)Å, α = γ =90.00°, β =93.420 (6)° and V =5918 (3)Å3, was synthesized by solvothermal technique. Compound 1 was characterized by single crystal X-ray diffraction. It contains isolated zinc tetrahedra and octahedra by the organic linker BDC2 − forming an anionic porous network with 2D channels. Positively charged ions and solvent molecules are present in the pores compensating for the negative charge of the framework. This positively charged molecule could be exchanged with metal ions, as it is evident by ICP, TGA and NMR studies. Unlike type V nitrogen adsorption isotherm curve of 1 at 77K, replacement of the organic cation with smaller Li+ leads to a type I adsorption isotherm.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • A first principle study on Fe incorporated MTW-type zeolite
    • Abstract: Publication date: 15 November 2014
      Source:Microporous and Mesoporous Materials, Volume 199
      Author(s): Gang Feng , Zhang-Hui Lu , Deqin Yang , Dejin Kong , Jianwen Liu
      The distribution scheme of Fe3+ cation in MTW-type zeolite and its influence on the acid property were systematically studied using dispersion-corrected density functional theory. The calculated energy differences are small for different incorporated T sites, indicating that Fe atoms might distribute in all kinds of T sites. Substitution energy is firstly introduced to evaluate relative synthesis difficulty for metal incorporated zeolite. For MTW-type zeolites, the calculated substitution energies give the order of NaAl-MTW>NaFe-MTW>NH4Al-MTW>NH4Fe-MTW>HAl-MTW>HFe-MTW, which are in line with experimental observations, illustrating a real case that substitution energies can be used to pre-select the prescriptions for zeolite synthesis. Acidity studies show that the Lewis acidities of HFe-MTW zeolite are stronger than those of HAl-MTW zeolite, while the Brønsted acidities of HFe-MTW zeolite are weaker than those of HAl-MTW zeolite. Adsorption studies of NH3 and pyridine show that adsorption on the Lewis acid sites are less stable than on the Brønsted acid sites. These results are also in well agreement with the previous experimental observations and provide new insights for MTW-type zeolites.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Effectiveness of the reversible structural conversion of MWW zeolite for
           preparation of interlayer-expanded Ti-MWW with high catalytic performance
           in olefin epoxidation
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Masato Yoshioka , Toshiyuki Yokoi , Takashi Tatsumi
      Interlayer-expanded MWW-type titanosilicate, Ti-IEZ-MWW, has been successfully prepared through the reversible structural conversion (RSC) of the MWW zeolite. First, the layered precursor of the MWW titanosilicates, Ti-MWW(P), was treated in an aqueous solution of HNO3 to remove octahedrally-coordinated Ti species in Ti-MWW(P) (Ti-MWW(P)-AT). This acid-treatment led to the partial removal of piperidine molecules, which served as pillaring species between the MWW layers as well as the structure-directing agent for the MWW-type zeolite, resulting in the condensation of silanol on the layer surface and formation of the three-dimensional (3D) MWW structure. Next, to promote the structural rearrangement from the 3D MWW structure to the original layered precursor, Ti-MWW(P)-AT was hydrothermally treated in the aqueous solution containing piperidine, forming a layered material (Ti-MWW(P)-RSC), which has almost the same structure as Ti-MWW(P). Finally, the interlayer silylation of Ti-MWW(P)-RSC was performed using diethoxydimethylsilane under acidic conditions. Thus prepared material, Ti-IEZ-MWW-RSC, contained unique framework Ti species and showed a higher catalytic activity in the epoxidation of cyclohexene with H2O2 compared to Ti-IEZ-MWW directly prepared from Ti-MWW(P) as well as the conventional 3D Ti-MWW.
      Graphical abstract image Highlights Interlayer-expanded MWW-type titanosilicate has been successfully prepared by utilizing the structural reversibility between the 3D crystalline and the layered structures.

      PubDate: 2014-09-01T08:05:22Z
       
  • Gas adsorption separation of CO2/CH4 system using zeolite 5A
    • Abstract: Publication date: December 2014
      Source:Microporous and Mesoporous Materials, Volume 200
      Author(s): Masoud Mofarahi , Fatemeh Gholipour
      Pure gas adsorption isotherms of carbon dioxide at (273, 283, 303, 323, 343)K and binary adsorption isotherms of carbon dioxide and methane at (303, 323)K and pressures up to 10bar on Zeochem Co. Zeolite 5A were measured using a volumetric method. Equilibrium gas phase compositions have been determined using a gas chromatograph (GC). The experimental binary equilibrium data were compared with equilibrium data calculated by ideal adsorbed solution theory (IAST), and vacancy solution model (VSM). A model analysis of the experimental data has been performed with real adsorbed solution theory (RAST) owing to not satisfactory prediction of multi-component behavior with IAST and VSM. For this purpose, activity coefficients, accounting for the non-ideality of the adsorbed mixture, were calculated from the experimental data. The results of the pure experimental data showed that, the heat of adsorption for methane is approximately independent of loading (about 20kJ/mol), and for carbon dioxide decreases by increasing loading when q <0.5mol/kg. Subsequently, by increasing loading, the heat of adsorption increases up to q =2mol/kg. The selectivity of both simulated landfill and biogas mixtures have been also measured experimentally. These data indicated that zeolite 5A can be successfully applied in CO2/CH4 separation for landfill gas and biogas upgrading.
      Graphical abstract image

      PubDate: 2014-09-01T08:05:22Z
       
  • Influence of tetrahydrofuran (THF) in the synthesis of zeolite ZK-5
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): L.J. Garces , B. Hincapie , X. Shen , V.D. Makwana , D.R. Corbin , A. Sacco , S.L. Suib
      ZK-5 (KFI) molecular sieve was synthesized in the K2O:SrO:Al2O3:SiO2:160 H2O:THF system using conventional hydrothermal heating. Effect of tetrahydrofuran (THF) was investigated. Products were characterized by XRD, TGA, FESEM, EDX and TPD-MS. THF influences the crystallinity and crystal size of ZK-5. The molar ratio of THF/Al2O3 from 0.4 to 1.0 gives the best results in terms of crystallinity (measured by XRD) and purity for the prepared ZK-5. Crystal size of ZK-5 zeolite is reduced by the presence of THF.
      Graphical abstract image Highlights

      PubDate: 2014-08-01T18:10:42Z
       
  • Preparation and studies on properties of porous epoxy composites
           containing microscale hollow epoxy spheres
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Chao-Chen Hsu , Kung-Chin Chang , Tsao-Cheng Huang , Lu-Chen Yeh , Wei-Ting Yeh , Wei-Fu Ji , Jui-Ming Yeh , Tsung-Yen Tsai
      In this work, a series of porous epoxy composites containing microscale, hollow epoxy spheres were synthesized and characterized. First, microscale epoxy spheres were produced using amino-modified silica (AMS) particles with diameters of ∼1μm through a base-catalyzed sol–gel route. The as-synthesized AMS particles were then characterized through Fourier-transform infrared, 13C nuclear magnetic resonance (NMR), and 29Si-NMR spectroscopy. The prepared core–shell particles were immersed into a 1wt.% of HF solution for 24h to remove the inner part of the silica core, leading to the formation of hollow spheres of epoxy with a wall thickness of ∼100nm. These hollow epoxy spheres (HES) were characterized by scanning electron microscopy (SEM), Transmission electron microscopy, and thermogravimetric analysis (TGA). Finally, a series of hybrid materials was synthesized by performing thermal ring-opening polymerization reactions of epoxy resin in the presence of as-synthesized HES. Based on SEM observations on the morphology, the HES showed good dispersion capability in the polymer matrices, which led to a significantly reduced thermal conductivity and slightly decreased dielectric constant based on the transient plane source and LCR measurements, respectively. For example, the thermal conductivity and dielectric constant decreased by 49.3% and 12.6%, respectively, in the porous epoxy material synthesized with a final HES loading of about 10%. One possible reason was the large amount of air present in the material. Other physical characteristics such as the thermal and mechanical properties based on the results of TGA, differential scanning calorimetry, and dynamic mechanical analysis were investigated.
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      PubDate: 2014-08-01T18:10:42Z
       
  • CO2 selective NaMg-CTS-1 and its structural formation from the titanium
           silicate based molecule sieve NaMg-ETS-4
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Ocean Cheung , Jie Su , Zoltán Bacsik , Jing Li , Louise Samain , Xiaodong Zou , Niklas Hedin
      A range of titanium silicates (ETS-4 and CTS-1) with interesting gas separation properties were studied as CO2 adsorbents. Some of these adsorbents, in particular NaMg-CTS-1, showed the ability to selectively adsorb CO2-over-N2. Partially exchanged NaM-ETS-4 (M=Mg, Ca, Sr and Ba) were synthesised in the Na+ form and ion exchanged with group 2 cations. All but NaBa-ETS-4 transformed into their CTS-1 counterparts, when these partially exchanged Na-ETS-4 were dehydrated. The transformation from ETS-4 to CTS-1 was monitored and studied extensively using diffraction and spectroscopic techniques. Powder X-ray diffraction allowed us to follow the changes of the unit cell parameters occurred at different temperatures. We combined high energy X-ray total scattering (analysed by pair distribution functions – PDF analysis), electron diffraction, infrared, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy to study the transformation of ETS-4 to CTS-1. We understood that under dehydration steps, there was significant disruption to the Ti–O–Ti chain along the b-axis, which occurred concurrently with the distortion of the double 3-rings alongside of these chains. These changes were partly responsible for the contraction of the ETS-4 framework (and successive transformation to CTS-1). The new information allowed us to understand the interesting structures and sorption properties of these adsorbents.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Ion-exchange resin modified with aggregated nanoparticles of zirconium
           hydrophosphate. Morphology and functional properties
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Yuliya S. Dzyazko , Ludmila N. Ponomaryova , Yurii M. Volfkovich , Vladimir V. Trachevskii , Alexey V. Palchik
      Organic–inorganic ion-exchangers based on gel-like strongly acidic resin, which contain different amount of zirconium hydrophosphate, have been obtained. The samples were investigated using methods of transmission and scanning electron microscopy, standard contact porosimetry, NMR 35P spectroscopy. Nanoparticles of the inorganic constituent (10nm) are deposited in voids between geld field and in structure defects of the polymer forming aggregates of micron size. These large particles squeeze and stretch pores of the polymer, where –SO3 groups are located, a radius of these pores decreases from 10nm down to 2nm. A part of functional groups of the polymer component are excluded from ion exchange due to squeezing of pores, ion exchange properties are determined mainly by the inorganic constituent. Ion exchange capacity of the composites reaches 0.6–1.3mmolcm−3. These materials sorb preferably Cd2+ and Ni2+ from solutions, which contain also hardness ions. The highest break-through capacity has been found for the composite with the smallest microporosity of the polymer constituent, this value reaches 80% of total ion-exchange capacity.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Micro-structural information of porous materials by optical coherence
           tomography
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): S.L. Campello , W.P. dos Santos , V.F. Machado , C.C.B.O. Mota , A.S.L. Gomes , R.E. de Souza
      In this study we describe the use of optical coherence tomography (OCT) to reveal microstructures and damages in porous media. An approach for establishing pore size and pore size distribution based upon OCT was developed. This approach was tested with oil source rock samples. Several sedimentary rock samples from Brazilian oil fields with porosity values ranging between 15% and 28% were evaluated, and the results agreed quite well with the traditional pycnometry method. In addition, pore size distribution for the samples in three dimensional planes were obtained. Finally, the experimental results proved that the OCT images with a suited digital post-processing can be used to measure pore size distribution in natural and artificial materials, with the advantage of being non-invasive, faster and much less expensive than other presently available methods.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Preparation and characterization of activated carbon from plant wastes
           with chemical activation
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Metin Açıkyıldız , Ahmet Gürses , Semra Karaca
      Activated carbon has been widely used in the sorption of chemical species from aqueous solutions as a versatile adsorbent with optimal sorption properties. However, production and regeneration of commercial activated carbons are still expensive and so the importance of activated carbon production by using low-cost raw materials and methods are still up to date. In this study, a one-step chemical activation process by zinc chloride was used to obtain activated carbon from plant wastes (PWs) such as pine sawdust (PS), rose seed (RS), and cornel seed (CS). The effect of activation parameters such as carbonization temperature, impregnation (ZnCl2/PW) ratio, and impregnation time on the properties of final products were investigated. The produced activated carbons were characterized by nitrogen adsorption isotherms at 77K. The present results showed that the surface area and methylene blue index of activated carbons, which were determined by adsorption tests, were achieved as high as 1825m2/g and 300mg/g in their highest value, respectively.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Silicate ionic liquid synthesis of zeolite merlinoite: Crystal size
           control from crystalline nanoaggregates to micron-sized single-crystals
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Mohamed Haouas , Louwanda Lakiss , Charlotte Martineau , Jaafar El Fallah , Valentin Valtchev , Francis Taulelle
      A new procedure for zeolite synthesis based on a silicate ionic liquid is reported. The method consists of a two-step precursor preparation. In the first step, a liquid silicate is prepared by hydrolyzing tetraethylorthosilicate (TEOS) with KOH–H2O mixture, which induces coacervation resolved into full phase demixing and subsequent separation from a water–ethanol phase by simple decantation. In the second step, an appropriate amount of an alkaline aluminate is mixed with the first liquid silicate, avoiding therefore precipitation. To the best of our knowledge, this represents the first example of homogeneous liquid synthesis, and not a clear sol or a gel, of an Al-rich zeolite, free of organic template. The approach is exemplified by the synthesis of merlinoite with potassium hydroxide as mineral base and could be extended to other zeolitic systems by varying the chemical composition and the nature of the alkali cation. The synthesis yield depends on the Al content and the crystalline products showed a very large range of particle sizes varying from nanometer scale to about a hundred microns when increasing the Al concentration. Crystallization proceeds most likely through nucleation from a liquid where nucleation and growth directly affects the ultimate crystal size and morphology.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Effect of lanthanum and phosphorus on the aromatization activity of
           Zn/ZSM-5 in FCC gasoline upgrading
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Huayun Long , Fengying Jin , Guang Xiong , Xiangsheng Wang
      The effects of La and P addition on the physicochemical properties and the aromatization performance of Zn/ZSM-5 were investigated. The introduction of Zn decreased the amount of Brönsted acid sites and increased that of Lewis acid sites of nanoscale ZSM-5. To improve the yields of aromatics in the aromatization of olefins on bifunctional catalysts, it is necessary to increase the participation of the dehydrogenation reactions in the formation of dienes and the corresponding aromatics from cyclic intermediates in n-octene aromatization. XPS results indicated that the addition of La to Zn/ZSM-5 improves the dispersion of zinc species, strengthens the zinc species-support interaction, increases the amount of [Zn(OH)]+ species, and thus improves the aromatization activity. P addition resulted in the presence of zinc species located in the channels of nanoscale HZSM-5 and enhanced the stability of the catalyst. The synergistic effect of La and P increased the amount of [Zn(OH)]+ species, decreased the loss of zinc species and consequently increased the aromatization activity and the stability of the catalyst. The FCC gasoline upgrading results showed that olefins can be converted into aromatics over ZnLaP/ZSM-5 to compensate the loss of octane number, which suggests a good prospect for application in industry.
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      PubDate: 2014-08-01T18:10:42Z
       
  • Enhancement of synthesis of ZSM-11 zeolite by microwave irradiation
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Federico Azzolina Jury , Isabelle Polaert , Lionel Estel , Liliana B. Pierella
      A novel and complete description for ZSM-11 zeolite microwave-assisted synthesis is provided. The time required for the synthesis of ZSM-11 zeolite was remarkably reduced down to 3–4days instead of 14days under classical conditions, without the use of seed crystals and of any pretreatment step such as aging time. The crystallinity degree of ZSM-11 zeolites synthesized under microwave irradiation is considerably improved (39% higher) with respect to the crystallinity of conventional ZSM-11 zeolites. According to SEM images, the particle sizes of ZSM-11 zeolites synthesized by both methods are identical and a new morphology is observed when microwave irradiation is used. The surface area and microporous volume values for both synthesis methods are similar. In this work, the synthesis of ZSM-11 zeolite has been successfully intensified by using microwave irradiation. Energy consumption and synthesis time are considerably reduced.
      Graphical abstract image Highlights

      PubDate: 2014-07-28T17:46:59Z
       
  • Exploration of room temperature synthesis of palladium containing cubic
           MCM-48 mesoporous materials
    • Abstract: Publication date: 1 November 2014
      Source:Microporous and Mesoporous Materials, Volume 198
      Author(s): Harrison S. Kibombo , Vagulejan Balasanthiran , Chia-Ming Wu , Rui Peng , Ranjit T. Koodali
      Pd-MCM-48 mesoporous materials were synthesized by a modified Stöber synthesis method in 4h at room temperature. Pd nanoparticles were prepared by using Na2[PdCl4] and Pd(acac)2 as Pd precursors, and their influence in the preparation of the cubic MCM-48 mesoporous phase was investigated. In addition, Pd(0) nanoparticles was prepared separately and added to the synthesis gel. The influence of varying the Pd precursor, solvent media, the time of addition of Pd precursor, and the concentration of NaBH4 reducing agent used for preparation of Pd(0) and its effect for the formation of the cubic phase were investigated. These resultant materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–Visible spectroscopy, nitrogen physisorption, and CO-Pulse titration. Reusability studies assessing a material prepared using Pd(0)-DMAP encapsulated nanoparticles that were reduced with 0.1N NaBH4 i.e. 3%Pd-MCM-48-D-N01 indicate that the yields for the hydrogenation of trans-cinnamic acid are greater than 95% even after 8 catalytic cycles, and at which the cubic phase was maintained under our experimental conditions.
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      PubDate: 2014-07-28T17:46:59Z
       
 
 
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