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  Subjects -> PHYSICS (Total: 784 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
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PHYSICS (569 journals)            First | 1 2 3 4 5 6 | Last

Journal of Physics A : Mathematical and Theoretical     Hybrid Journal   (Followers: 2)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 4)
Journal of Physics D : Applied Physics     Hybrid Journal   (Followers: 11)
Journal of Physics: Condensed Matter     Hybrid Journal   (Followers: 8)
Journal of Physics: Conference Series     Open Access   (Followers: 3)
Journal of Plasma Physics     Hybrid Journal   (Followers: 4)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 22)
Journal of Porous Materials     Hybrid Journal   (Followers: 3)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 3)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal  
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 24)
Journal of Research in Physics     Open Access  
Journal of Rheology     Full-text available via subscription   (Followers: 6)
Journal of Romance Studies     Full-text available via subscription   (Followers: 2)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 1)
Journal of Scientific Research     Open Access   (Followers: 1)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Sensors     Open Access   (Followers: 8)
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     Open Access   (Followers: 1)
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: 11)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 20)
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: 4)
Journal of Vibration and Control     Hybrid Journal   (Followers: 27)
Journal of Visualization     Hybrid Journal   (Followers: 2)
Journal of Zhejiang University SCIENCE A     Hybrid Journal  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Language Learning Journal     Hybrid Journal   (Followers: 13)
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 10)
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: 3)
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 1)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 4)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 21)
Matéria (Rio de Janeiro)     Open Access   (Followers: 1)
Materials & Design     Hybrid Journal   (Followers: 36)
Materials at High Temperatures     Full-text available via subscription   (Followers: 4)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 13)
Materials Research     Open Access   (Followers: 7)
Materials Research Bulletin     Hybrid Journal   (Followers: 18)
Materials Research Innovations     Hybrid Journal   (Followers: 2)
Materials Science     Hybrid Journal   (Followers: 9)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 37)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 19)
Materials Science and Engineering: C     Hybrid Journal   (Followers: 18)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 12)
Materials Science and Technology     Hybrid Journal   (Followers: 23)
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: 4)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 10)
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   (Followers: 1)
NANO     Hybrid Journal   (Followers: 8)
Nano Letters     Full-text available via subscription   (Followers: 53)
Nano Reviews     Open Access   (Followers: 17)
NanoBioImaging     Open Access  
Nanomechanics     Open Access  
Nanoscale and Microscale Thermophysical Engineering     Hybrid Journal   (Followers: 3)
Nanoscale Research Letters     Open Access   (Followers: 4)
Nanospectroscopy     Open Access  
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 18)
Natural Science     Open Access   (Followers: 9)
Nature Communications     Open Access   (Followers: 52)
Nature Materials     Full-text available via subscription   (Followers: 50)
Nature Physics     Full-text available via subscription   (Followers: 27)
NDT & E International     Hybrid Journal   (Followers: 14)
NEUTRINO     Open Access  
Neutron News     Hybrid Journal  

  First | 1 2 3 4 5 6 | Last

Journal Cover   Microporous and Mesoporous Materials
  [SJR: 1.306]   [H-I: 102]   [3 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1387-1811
   Published by Elsevier Homepage  [2812 journals]
  • Modelling the adsorption of short alkanes in protonated chabazite: The
           impact of dispersion forces and temperature
    • Abstract: Publication date: 15 January 2013
      Source:Microporous and Mesoporous Materials, Volume 166
      Author(s): Florian Göltl , Jürgen Hafner
      The adsorption of alkanes in a protonated zeolite has been investigated at different levels of theory. At the lowest level we use density-functional theory (DFT) based on semi-local (gradient-corrected) functionals which account only for the interaction of the molecule with the acid site. To describe the van der Waals (vdW) interactions between the saturated molecule and the inner wall of the zeolite we use (i) semi-empirical pair interactions, (ii) calculations using a non-local correlation functional designed to include vdW interactions, and (iii) an approach based on calculations of the dynamical response function within the random-phase approximation (RPA). The effect of finite temperature on the adsorption properties has been studied by performing molecular dynamics (MD) simulations based on forces derived from DFT plus semi-empirical vdW corrections. The simulations demonstrate that even at room temperature the binding of the molecule to the acid site is frequently broken such that only the vdW interaction between the alkane and the zeolite remains. The finite temperature adsorption energy is calculated as the ensemble average over a sufficiently long molecular dynamics run, it is significantly reduced compared to the T =0K limit. At a higher level of theory where MD simulations would be prohibitively expensive we propose a simple scheme based on the averaging over the adsorption energies in the acid and in the purely siliceous zeolite to account for temperature effects. With these corrections we find an excellent agreement between the RPA predictions and experiment.
      Graphical abstract image Highlights ► Alkane adsorption in chabazite is modelled using electronic structure theory. ► Finite temperature effects are estimated by molecular dynamics simulations. ► An extrapolation mechanism to finite temperature is proposed. ► Results are critically compared to experimental data.

      PubDate: 2015-05-19T04:00:16Z
       
  • On the pore forming mechanism of Upsalite, a micro- and mesoporous
           magnesium carbonate
    • Abstract: Publication date: 15 May 2014
      Source:Microporous and Mesoporous Materials, Volume 190
      Author(s): Sara Frykstrand , Johan Forsgren , Albert Mihranyan , Maria Strømme
      This work analyzes the pore forming mechanism and stability of Upsalite; an extraordinary moisture absorbing, high-surface area magnesium carbonate powder synthesised without the use of surfactants as pore forming agents. The pores in Upsalite were found to be created in a two-step process where the first step includes the formation of micropores by solvent evaporation and release of physically bound carbon dioxide, acting as an in situ pore-forming template. In the second step, the micropores expand to mesopores due to partial decomposition of organic groups on the surface of the pore walls when the material is stored in air at moderate temperatures (70°C). The resulting material has a narrow pore size distribution centered at 5nm, and the amorphous structure is stable upon storage in a humid atmosphere. It was further shown that calcination at temperatures above 250°C is required for complete removal of the organic surface groups in Upsalite. Prior to calcination, the organic groups present in the material act as barriers hindering water to induce crystallization of the bulk material. After calcination, however, Upsalite crystallizes into nesquehonite when stored at 100% relative humidity for several days. The results presented herein are expected to be useful for the development of novel surfactant-free synthesis routes of porous materials as well as for the understanding of the long-term performance of such materials.
      Graphical abstract image Highlights

      PubDate: 2015-05-19T04:00:16Z
       
  • Air separation at cryogenic temperature using MFI membranes
    • Abstract: Publication date: 1 July 2014
      Source:Microporous and Mesoporous Materials, Volume 192
      Author(s): Pengcheng Ye , Erik Sjöberg , Jonas Hedlund
      In the present work, zeolite membranes were for the first time evaluated for separations at cryogenic temperatures. MFI membranes were evaluated with a feed of synthetic air, at varying feed pressures between 1 and 5bar and a sweep stream of helium at a constant pressure of 1bar for temperatures in the range 77–110K. When the feed pressure was 1bar, the highest O2/N2 separation factor was 3.9, corresponding to a separation selectivity of 4.1, with an oxygen permeance of 6.7×10− 7 molm− 2 s− 1 Pa−1 at the optimum temperature 79K. This membrane performance is just above the upper bound in the 2008 Robeson selectivity–permeability plot for polymeric membranes. As the feed pressure increased, the maximum separation factors for O2/N2 decreased while the optimum separation temperatures increased. It is inferred that the separation is governed by condensation and effective transport of oxygen in the zeolite pores under these conditions. However, the adsorption of nitrogen, and thereby the transport of nitrogen, likely increases as the pressure is increased, which reduce the selectivity. To test this hypothesis, the feed was diluted with 33% helium and the total feed pressure was maintained at 1bar, corresponding to a partial pressure of air of 0.66bar. In this case, the maximum separation factor increased to 4.3, which supports the proposed separation mechanism.
      Graphical abstract image Highlights

      PubDate: 2015-05-19T04:00:16Z
       
  • Novel silica-based adsorbents with activated carbon structure
    • Abstract: Publication date: 1 July 2015
      Source:Microporous and Mesoporous Materials, Volume 210
      Author(s): Benjamin Curdts , Christian Pflitsch , Christoph Pasel , Martin Helmich , Dieter Bathen , Burak Atakan
      The preparation of silica adsorbances from chemical vapor infiltration of activated carbon with tetramethylsilane (TMS) is shown. The method bases on a two step process. In a first step, activated carbons are infiltrated at 943 K in a nitrogen-TMS-vapor atmosphere of 200 mbar. At these conditions, the carbon skeleton is covered with silicon. The resulting material is highly porous and well adapting the surface structure of the carbon templates. It is already partly oxidized at room temperature when coming into contact with air. In a second step, the infiltrated carbons are completely oxidized in air at 853 K. At these conditions, the supporting carbon skeleton is completely burned and the silicon becomes silicon oxide. The resulting materials are highly porous with extremely large surface areas around 835 m2/g. Overall, the novel material seems to well adapt the original macro- and microstructure of the activated carbon used.
      Graphical abstract image

      PubDate: 2015-05-19T04:00:16Z
       
  • Organic molecules of intrinsic microporosity: Characterization of novel
           microporous materials
    • Abstract: Publication date: August 2013
      Source:Microporous and Mesoporous Materials, Volume 176
      Author(s): Annalaura Del Regno , Flor R. Siperstein
      Molecular simulations were used in this work to characterise a new class of microporous material: organic molecules of intrinsic microporosity (OMIMs). Molecular dynamics simulations were used to generate the material’s samples, and grand canonical Monte Carlo simulations of argon adsorption were used to ascertain the relationship between the different structures and the observed properties. Packing behavior, porosity and adsorption capacity have been determined for each system. The final density of the material, as well as the surface area and pore volume depend on the ending group’s bulkiness. Bulkier molecules lead to materials with lower densities, but it was found that the adsorption behavior is not just related to the material’s density, but also to the pore size and shape, which are determined by the way the molecules pack. The relationship between adsorption capacity and physical properties were analyzed and the role of surface area, free volume and enthalpic interaction were used to identify different adsorption regimes. It was found that the uptake of argon at low pressure is proportional to the strength of the adsorbent-adsorbate interaction while at moderate pressure it is dependent on the free volume and surface area.
      Graphical abstract image

      PubDate: 2015-05-19T04:00:16Z
       
  • Optimising oscillating waveform-shape for pore size sensitivity in
           diffusion-weighted MR
    • Abstract: Publication date: 15 September 2013
      Source:Microporous and Mesoporous Materials, Volume 178
      Author(s): Ivana Drobnjak , Gastao Cruz , Daniel C. Alexander
      Optimising the shape of a generalised gradient waveform (GEN) in diffusion-weighted MR has been shown to, in theory, greatly increase sensitivity to pore size. The broad class of optimised shapes takes simple oscillatory forms. To speed up convergence of the optimisation, improve computation times and make the waveforms more practical, here we explore various oscillatory waveforms constructed from trapezoidal and sinusoidal shapes and compare their performance with the optimised GEN waveform. The oscillating waveforms are optimised to maximise sensitivity to parameters, such as axon radius, intra-cellular volume fraction and diffusion constants, of a simple white matter model. Simulation experiments find that all oscillating waveforms we tried perform significantly better than the original generalised waveform due to the improved convergence of the optimisation. Differences among the oscillating shapes however are very small and although a truncated sinusoidal waveform consistently gives the lowest cost function, no significant difference in the estimated model parameters was found. Therefore the simplest choice, i.e. the trapezoidal parametrisation, seems sufficient for most practical purposes.
      Graphical abstract image

      PubDate: 2015-05-19T04:00:16Z
       
  • Discrete modelling of contaminant diffusion in porous media with sorption
    • Abstract: Publication date: 1 February 2014
      Source:Microporous and Mesoporous Materials, Volume 185
      Author(s): Qingrong Xiong , Andrey P. Jivkov , John R. Yates
      A meso-scale model for diffusion of foreign species through porous media is proposed. The model considers diffusion as a continuous process operating on a discrete geometrical structure dictated by the pore size distribution. Local diffusivities and hence pore space connectivity are dependent on the size of the diffusing species and the sorption of those species onto the pore walls. The bulk diffusivity of the medium has been analysed to consider the effects of pore structure alone and in combination with sorption. The chosen medium is bentonite, which is being considered for use as a barrier to radionuclide transport in future deep geological repositories for nuclear waste. Results for transient diffusion of U(VI)-complex through bentonite are presented and very good agreement with experiments is demonstrated. Results for diffusion of larger chemical complexes are also presented to illustrate the effect of reduced pore space connectivity on steady-state and transient transport parameters. Diffusion of larger complexes can be used for experimental validation of the model. The proposed methodology can be used for any micro- and meso-porous material with known distribution of pore sizes. It can be extended to other pore space changing mechanisms, in addition to sorption, to derive mechanism-based evolution laws for the transport parameters of porous media.
      Graphical abstract image

      PubDate: 2015-05-19T04:00:16Z
       
  • CO2 desorption via microwave heating for post-combustion carbon capture
    • Abstract: Publication date: October 2014
      Source:Microporous and Mesoporous Materials, Volume 197
      Author(s): Theo Chronopoulos , Yolanda Fernandez-Diez , M. Mercedes Maroto-Valer , Raffaella Ocone , David A. Reay
      In this work, a comparison of CO2 desorption rates of microporous activated carbon (AC) using Microwave Swing Desorption (MSD) and Temperature Swing Desorption (TSD) is reported. For the purposes of this study, a modified microwave oven and a conventional oven were used, heating the AC packed bed to two different temperatures (70°C and 130°C). Results showed that microwaves are able to enhance the rate of CO2 desorption from the AC, contributing to a four times faster overall desorption process, compared to conventional heating desorption.
      Graphical abstract image Highlights

      PubDate: 2015-05-19T04:00:16Z
       
  • PIM-1/graphene composite: A combined experimental and molecular simulation
           study
    • Abstract: Publication date: June 2015
      Source:Microporous and Mesoporous Materials, Volume 209
      Author(s): Aleksandra Gonciaruk , Khalid Althumayri , Wayne J. Harrison , Peter M. Budd , Flor R. Siperstein
      This work presents a combined molecular simulation and experimental study to understand the effect of graphene on the packing and gas adsorption performance of a new class of polymers, known as polymers of intrinsic microporosity (PIMs). PIMs can be processed to membranes or other useful forms and their chemistry can be tailored for specific applications. Their rigid and contorted macromolecular structures give rise to a large amount of microvoids attractive for small molecule adsorption. We show that the presence of graphene in the composite affects the structure of the membrane as evidenced by the change in colour and SEM micrographs, but it does not reduce significantly the adsorption capacity of the material.
      Graphical abstract image

      PubDate: 2015-05-19T04:00:16Z
       
 
 
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