Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 journals)            First | 1 2 3 4 | Last

Showing 401 - 600 of 735 Journals sorted alphabetically
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 5)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 6)
Journal of Nanoparticles     Open Access   (Followers: 4)
Journal of Nanostructure in Chemistry     Open Access   (Followers: 8)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 25)
Journal of Photochemistry and Photobiology     Open Access  
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Journal of Polymer & Composites     Full-text available via subscription   (Followers: 17)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 92)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access  
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 14)
Journal of Research and Education Chemistry     Open Access   (Followers: 1)
Journal of Research Updates in Polymer Science     Hybrid Journal   (Followers: 2)
Journal of Rubber Research     Hybrid Journal   (Followers: 1)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 13)
Journal of Solution Chemistry     Hybrid Journal   (Followers: 1)
Journal of Structural Chemistry     Hybrid Journal   (Followers: 1)
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 1)
Journal of Supercritical Fluids     Hybrid Journal   (Followers: 3)
Journal of Superhard Materials     Hybrid Journal  
Journal of Surface Science and Technology     Hybrid Journal  
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 3)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Hybrid Journal   (Followers: 324)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 2)
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Chinese Chemical Society     Hybrid Journal  
Journal of the Indian Chemical Society     Hybrid Journal  
Journal of The Indonesian Society of Integrated Chemistry     Open Access  
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal  
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of the Serbian Chemical Society     Open Access  
Journal of the Turkish Chemical Society, Section A : Chemistry     Open Access  
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 9)
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Kimia (Journal of Chemistry)     Open Access  
Jurnal Kimia Riset     Open Access  
Jurnal Pendidikan Kimia     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kinetics and Catalysis     Hybrid Journal   (Followers: 4)
Konfigurasi : Jurnal Pendidikan Kimia dan Terapan     Open Access  
Korea-Australia Rheology Journal     Hybrid Journal   (Followers: 1)
Langmuir     Hybrid Journal   (Followers: 58)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access  
Luminescence     Hybrid Journal   (Followers: 2)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 5)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 10)
Macromolecular Research     Hybrid Journal   (Followers: 2)
Macromolecular Symposia     Hybrid Journal   (Followers: 3)
Macromolecular Theory and Simulations     Hybrid Journal   (Followers: 2)
Macromolecules     Hybrid Journal   (Followers: 48)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 8)
Magnetochemistry     Open Access  
Marine Chemistry     Hybrid Journal   (Followers: 6)
Marine Drugs     Open Access   (Followers: 1)
MATEC Web of Conferences     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials and Devices     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 32)
Materials Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Materials Horizons     Hybrid Journal   (Followers: 6)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Science-Poland     Open Access   (Followers: 1)
Materials Sciences and Applications     Open Access   (Followers: 2)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 9)
Mediterranean Journal of Chemistry     Open Access  
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microchimica Acta     Hybrid Journal   (Followers: 2)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Chemistry & Applications     Open Access   (Followers: 1)
Modern Research in Catalysis     Open Access  
Molbank     Open Access  
Molecular Catalysis     Hybrid Journal   (Followers: 6)
Molecules     Open Access   (Followers: 4)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 4)
Mongolian Journal of Chemistry     Open Access  
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 1)
MRS Bulletin     Full-text available via subscription   (Followers: 4)
Nachrichten aus der Chemie     Hybrid Journal   (Followers: 18)
Nano Convergence     Open Access   (Followers: 1)
Nano Materials Science     Open Access   (Followers: 1)
Nano Reviews & Experiments     Open Access   (Followers: 14)
Nano Select     Open Access   (Followers: 1)
Nanochemistry Research     Open Access   (Followers: 1)
Nanoscale     Hybrid Journal   (Followers: 18)
Nanoscale Advances     Open Access  
Nanoscale Horizons     Hybrid Journal  
Nanoscale Research Letters     Open Access   (Followers: 8)
Nanoscience and Nanotechnology Letters     Full-text available via subscription   (Followers: 24)
Natural Product Communications     Open Access  
Natural Product Reports     Hybrid Journal   (Followers: 10)
Natural Science     Open Access   (Followers: 8)
Natural Volatiles & Essential Oils     Open Access  
Nature Chemistry     Full-text available via subscription   (Followers: 97)
Nature Protocols     Full-text available via subscription   (Followers: 72)
Nature Reviews Chemistry     Hybrid Journal   (Followers: 17)
New Journal of Chemistry     Hybrid Journal   (Followers: 17)
Nitric Oxide     Hybrid Journal  
Nitrogen     Open Access  
Nukleonika     Open Access  
Open Chemistry Journal     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Chemistry     Open Access  
Open Journal of Composite Materials     Open Access   (Followers: 22)
Open Journal of Inorganic Non-metallic Materials     Open Access   (Followers: 2)
Open Journal of Medicinal Chemistry     Open Access   (Followers: 4)
Open Journal of Polymer Chemistry     Open Access   (Followers: 12)
Open Journal of Synthesis Theory and Applications     Open Access  
Open Medicinal Chemistry Journal     Open Access  
Orbital - The Electronic Journal of Chemistry     Open Access   (Followers: 1)
Organic & Biomolecular Chemistry     Hybrid Journal   (Followers: 57)
Organometallics     Hybrid Journal   (Followers: 19)
Oxidation of Metals     Hybrid Journal   (Followers: 16)
Passer Journal of Basic and Applied Sciences     Open Access  
Peptide Science     Full-text available via subscription  
Pharmaceuticals     Open Access   (Followers: 4)
Pharmaceutics     Open Access   (Followers: 5)
Phosphorus, Sulfur, and Silicon and the Related Elements     Hybrid Journal   (Followers: 2)
Photochemistry and Photobiology     Hybrid Journal   (Followers: 3)
Physical Science International Journal     Open Access  
Physics and Materials Chemistry     Open Access   (Followers: 1)
Phytochemistry     Hybrid Journal   (Followers: 4)
Phytochemistry Letters     Full-text available via subscription   (Followers: 1)
Plasma     Open Access   (Followers: 3)
Plasma Chemistry and Plasma Processing     Hybrid Journal   (Followers: 3)
Polycyclic Aromatic Compounds     Hybrid Journal  
Polyhedron     Hybrid Journal   (Followers: 4)
Polymer Chemistry     Hybrid Journal   (Followers: 24)
Polymer crystallization     Hybrid Journal  
Polymer Degradation and Stability     Hybrid Journal   (Followers: 23)
Polymer Engineering & Science     Hybrid Journal   (Followers: 14)
Polymer Reviews     Hybrid Journal   (Followers: 32)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Polymer Testing     Hybrid Journal   (Followers: 194)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Polymers     Open Access   (Followers: 21)
Polymers from Renewable Resources     Hybrid Journal  
Proceedings of the Combustion Institute     Full-text available via subscription   (Followers: 8)
Processes     Open Access  
Progress in Lipid Research     Hybrid Journal   (Followers: 3)
Progress in Organic Coatings     Hybrid Journal   (Followers: 7)
Progress in Polymer Science     Full-text available via subscription   (Followers: 36)
Progress in Reaction Kinetics and Mechanism     Open Access  
Progress in Solid State Chemistry     Full-text available via subscription   (Followers: 3)
Progress in Surface Science     Full-text available via subscription   (Followers: 3)
Protein Science     Hybrid Journal   (Followers: 45)
Radiochemistry     Hybrid Journal   (Followers: 1)
Rapid Communications in Mass Spectrometry     Hybrid Journal   (Followers: 33)
Reaction Chemistry & Engineering     Hybrid Journal  
Reaction Kinetics, Mechanisms and Catalysis     Hybrid Journal   (Followers: 3)
Reactions     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Research Journal of Phytochemistry     Open Access   (Followers: 1)
Resources Chemicals and Materials     Full-text available via subscription   (Followers: 3)
Results in Chemistry     Open Access  
Results in Geochemistry     Open Access  
Results in Surfaces and Interfaces     Open Access  
Review Journal of Chemistry     Hybrid Journal   (Followers: 1)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista Boliviana de Química     Open Access  
Revista CENIC. Ciencias Quimicas     Open Access  
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access  
Revista Colombiana de Química     Open Access  
Revista Cubana de Química     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciencias     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Sociedad Química del Perú     Open Access  
Revista de la Societat Catalana de Química     Open Access  
Revista de Química     Open Access   (Followers: 5)
Revista Debates em Ensino de Química     Open Access  
Revista ION     Open Access  
RSC Advances     Open Access   (Followers: 27)
RSC Chemical Biology     Open Access  
RSC Medicinal Chemistry     Hybrid Journal   (Followers: 6)
Russian Journal of Bioorganic Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Coordination Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of General Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Science China Chemistry     Hybrid Journal   (Followers: 2)
Science Talks     Full-text available via subscription   (Followers: 2)
Sciences & Technologie A : sciences exactes     Open Access  
Scientific Journal of Frontier Chemical Development     Open Access   (Followers: 2)

  First | 1 2 3 4 | Last

Similar Journals
Journal Cover
Journal of Nanostructure in Chemistry
Number of Followers: 8  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2008-9244 - ISSN (Online) 2193-8865
Published by SpringerOpen Homepage  [228 journals]
  • Analysis of the host–guest complex formation involving bridged hexameric
           pyridinium–phenyl rings in the HexaCage6+ host in suit[3]ane: insights
           from dispersion-corrected DFT calculations for a nanometric mechanically
           interlocked device

    • Abstract: Efficient and affordable synthetic nanometric hosts able to incorporate different species have attracted attention for further exploration of changes in chemical properties and reactivity at the nanomolecular scale. The recent incorporation of suit[3]ane, involving a host composed by two parallel hexameric platforms alternating pyridinium and phenyl rings, bridged by three p-phenylene units (Hexacage+6), results in a mechanically interlocked nanometric host–guest pairs. In such species, the host structure follows the contour of the guest, extends the well-developed use of charged pyridinium-based structures to Hexacage+6, and the use of benzotrithiophene (BTT) and its alkylated derivative (THBTT). Our results show a sizable stabilization of -119.0 kcal mol−1, in the formation of the host–guest complex, with a relevant London dispersion character contributing by ~ 60% of the stabilizing factors. This result accounts for the extended and π⋯π and C–H⋯π surface given by the BTT-aromatic core and the hexyl chains, respectively, towards the HexaCage6+ moiety in suit[3]ane. In addition, polarization and electrostatic character also contribute to the stabilization of the host–guest complex. The removal of the alkyl chains of THBTT leads to BTT, for which the interaction energy with the HexaCage6+, decreases to − 49.1 kcal mol−1, denoting the enhanced stabilization introduced by the alkyl moieties. The origin of the observed shielding patterns from 1H-NMR experiments was also revisited. Lastly, the understanding of the role from different stabilizing terms is useful for further rationalization and design of selective and enhanced hosts towards more versatile and tunable hosts. Charge transfer integrals in the host–guest species (THBTT⊂HexaCage6+ and BTT⊂HexaCage6+) were directly evaluated as the matrix elements of Kohn–Sham Hamiltonian, defined in terms of molecular orbitals of individual host and guest molecules. Our findings are totally in line with EDA results indicating that electron transfer is not the most significant process to the host–guest stabilization. Graphical abstract Fundamental analysis of mechanically interlocked structures at the nanomolecular scale, allows envisaging further nanometric molecular machines. Explanation of the graphics: Since the formation of the host–guest structure leads to a mechanically interlocked device, a shocking picture with stunning colors, denoting inclusion and motion was selected for the art.
      PubDate: 2022-05-21
       
  • Towards efficient ciprofloxacin adsorption using magnetic hybrid
           nanoparticles prepared with κ-, ι-, and λ-carrageenan

    • Abstract: The efficient removal of the antibiotic ciprofloxacin (CIP) from aqueous samples using magnetic nanosorbents prepared using three sulfated polysaccharides, κ-, ι- and λ-carrageenan and an alkoxysilane agent containing a reactive epoxide ring is described. The prepared nanosorbents were characterized in detail using FTIR spectroscopy, solid-state 29Si and 13C NMR spectroscopy and elemental microanalysis. The synthesis method was more effective for incorporating higher amounts of κ-carrageenan in the siliceous shells. Although being less sulfated, κ-carrageenan is cheaper than the other carrageenan tested. The CIP adsorption was a cooperative process, well described by the Dubinin–Radushkevich isotherm, with maximum adsorption capacities of 878, 969 and 865 mg/g for κ-, ι- and λ-carrageenan sorbents, respectively. Overall, the produced magnetic nanosorbents are among the best magnetic systems with high adsorptive efficiency for CIP. It is suggested that protonated CIP molecules are exchanged with ester sulfate counterions of carrageenan at the particles’ surface as the main pathway for CIP adsorption. The adsorption process was exothermic and entropically favorable for the three sorbents. However, at 298 K, the adsorption was spontaneous for κ-carrageenan-based sorbents and non-spontaneous for ι- and λ-carrageenan particles. The magnetic sorbents could be reused and maintained their ability towards CIP removal up to four cycles. The removal efficiency in wastewater was enhanced with the sorbent dose. Graphical abstract Magnetic carrageenan nanosorbents were prepared using three carrageenan polysaccharides (κ-, ι-, and λ-carrageenan). The resulting magnetic particles removed the antibiotic ciprofloxacin efficiently from ultra-pure water and wastewater samples. Magnetic features enabled the fast magnetic separation of the nanosorbents from water.
      PubDate: 2022-05-19
       
  • Remarkable adsorption performance for trace lead (II) by Fe/Zn 2D metal
           organic nanosheets modified with triethylamine

    • Abstract: Fe/Zn metal organic nanosheet (B-FeZn) was prepared using 1,4-benzenedicarboxylic acid and triethylamine. B-FeZn showed a remarkable trace-level lead (II) (Pb2+) adsorption performance. The removal rates reached ≥ 98% within 60 min. After five adsorption/desorption cycles, the adsorption capacity of B-FeZn for Pb2+ was decreased by 17.10%. Langmuir isothermal model and pseudo-second-order kinetic model were applied to define the purification process via the adsorption with high fitting degrees. The maximum adsorption capacity reached 215.90 mg·g−1. The prepared B-FeZn material exhibits a remarkable performance, with a fast adsorption rate and a prominent regeneration performance, in the adsorption for trace Pb2+, providing a novel Pb2+ adsorbent with a bright future in the Pb2+ removal in industrial production. Graphical abstract
      PubDate: 2022-05-18
       
  • Porphyrin-based metal–organic frameworks: focus on diagnostic and
           therapeutic applications

    • Abstract: As a hybrid material, metal organic frameworks (MOFs) contain unique characteristics for biomedical applications such as high porosity, large surface area, different crystalline morphologies, and nanoscale dimensions. These frameworks are assembled through the interconnection of organic linkers with metal nodes, while the engineering of an MOF for biomedical applications requires versatile linkers with acceptable symmetry. Porphyrin, as an organic linker with interesting photochemical and photophysical properties, attracted the attention of many for engineering the potent multifunctional porphyrinic metal organic frameworks (PMOFs). In this regard, a large number of approaches were conducted for designing robust practical PMOFs with a wide range of applications. In this review, we introduced another perspective of MOFs and coordination polymers constructed from porphyrinic linkers with a special focus on those synthesized by meso-tetrakis (4-carboxyphenyl) porphyrin (TCPP). In the following, we summarized and discussed the different types of PMOFs and their biomedical applications in terms of diagnostic agent, therapeutic platform, and drug delivery vehicle. Graphical abstract
      PubDate: 2022-05-16
       
  • Encapsulating MoS2-nanoflowers conjugated with chitosan oligosaccharide
           into electrospun nanofibrous scaffolds for photothermal inactivation of
           bacteria

    • Abstract: The bacterial inactivation using near-infrared (NIR) light irradiation with spatiotemporal control is advantageous to deal with the emerging microbial infection and the drug resistance in the environment and health-care facilities. Here, nanoflower-like MoS2 prepared by electrolysis synthesis was functionalized with α-lipoic acid and chitosan oligosaccharide (MoS2-LA-COS) resulting in a highly biocompatible, well dispersive, and NIR photo-responsive composite. The produced nanocomposite of MoS2-LA-COS retained the nanoflower-like morphological feature, of which the hexagonal structure (2H phase) was similar with that of MoS2 according to the X-ray diffraction measurement. Moreover, the produced MoS2-LA-COS was efficiently loaded into the electrospun nanofiber membranes (ENFs) endowing the fibrous scaffold with outstanding photothermal performance. The antibacterial studies indicated a superior bactericidal effect of the formed membranes under NIR irradiation towards the inactivation of model G− Staphylococcus aureus and G+ Escherichia coli strains, which was originated from the uniform distribution of MoS2-LA-COS on the fibrous scaffold. The produced MoS2-LA-COS nanofibrous membranes of good water vapor transmission rate and improved photothermal performance possess enormous potential for the development as well as the disposal of personal protective equipment such as medical masks. Graphical abstract
      PubDate: 2022-05-13
       
  • Visible light-driven photoelectrochemical enzyme biosensor based on
           reduced graphene oxide/titania for detection of glucose

    • Abstract: Developing a rapid and sensitive photo-electrochemical (PEC) sensing platform for glucose detection is highly desirable. Herein, a visible light-driven PEC enzyme biosensor for sensitive detection of glucose was proposed, employing reduced graphene oxide/titania (TiO2) nanotubes (RGO/TNTs) as photoactive materials and glucose oxidase (GOD) as the identification element. The RGO/TNTs composites were synthesized via a facile hydrothermal process. Notably, the unique nanostructure system significantly increases the absorption in the visible region and effectively separates the photo-generated electron–hole pairs, which is essential for promoting the PEC activity. In the presence of dissolved oxygen, the GOD immobilized on the modified electrode could specifically catalyze the electro-oxidation of glucose to produce H2O2, resulting in an increase of photocurrent intensity. Based on the variation of the photocurrent response, the constructed PEC enzyme biosensor exhibited high sensitivity with a wide linear range from 10–2 to 10 mM and a low detection limit of 5.0 μΜ. Meanwhile, the potential applicability of the PEC enzyme biosensor was evaluated by detecting glucose in human serum samples, and satisfactory results were obtained. Graphic abstract The PEC enzyme biosensor based on RGO/TNTs composites successfully realized the sensitive detection of glucose and displayed good selectivity, high stability and satisfactory repeatability.
      PubDate: 2022-04-01
       
  • Effects of structural distortion on the optoelectronic properties and
           reactivity of fullerenes: a DFT study

    • Abstract: Fullerene is a compound made up solely of carbon atoms structured in the form of cages with high symmetry. These compounds present a variety of applications, mainly due to their unique mechanical and electronic properties. In general, there is a relative scarcity of studies on the effect of mechanical deformations on the electronic properties of fullerenes, although some studies suggest the plausibility of such structural changes in specific situations. In the present report, density functional theory-based calculations were employed to evaluate the effects of structural deformations in the electronic, optical and reactivity properties of C60 and PCBM. The results evidence the existence of distinct regimes of the structural changes, which influence the intrinsic properties of these compounds in a distinct manner. In particular, it was observed that the compression/stretching of the structures can lead to the narrowing of the electronic gaps, enhanced optical absorption, decreased mobility of the holes, and changes in local reactivities. This information can help the interpretation of electronic processes and specific reactions of single molecules subjected to high pressures. Graphic abstract
      PubDate: 2022-04-01
       
  • Green and simple synthesized graphene/MnO2 quantum dot nanocomposite:
           characterization and application as an efficient adsorbent for solid-phase
           extraction of heavy metals

    • Abstract: Abstract The green and simple synthesized novel graphene/MnO2-QD (quantum dot) nanocomposites are reported in the present work. The nanocomposite was applied as solid-phase extraction (SPE) adsorbent for removing Ni2+ and Cr6+ heavy metal ions from water and wastewater samples. Graphene (G) and MnO2 as the nanocomposite components were successfully synthesized by totally green methods. Pomegranate juice was applied to prepare graphene nanosheets and wheat extract for MnO2-QDs. The nanocomposite was subsequently characterized by UV–Vis spectroscopy, Fourier transformed infrared spectroscopy, Raman spectrum, high-resolution transmission electron microscope, field-emission scanning electron microscope, and X-ray diffraction techniques. The particle size distribution of MnO2-QDs was in the range of 2–6 nm. Important experimental variables that could affect SPE performance (removal time and temperature, dosage of adsorbent and analyte, pH values) were investigated and optimized. Under optimized conditions, the limits of detection of heavy metal elements ranged from 0.33 to 0.58 mg L−1. Repeatability and reproducibility of the proposed method investigated and varied between 3.9% and 5.82%, and 7.63% and 9.21% (n = 5), respectively. For real sample analysis, river water and a tool of factory wastewater samples were studied. The present approach was successfully applied to removing target heavy metals in real samples.
      PubDate: 2022-04-01
       
  • Exploiting the high conjugation capacity of creatinine on
           3,3′-dithiodipropionic acid di(N-hydroxysuccinimide ester)
           functionalized gold nanoparticles towards sensitive determination of
           mercury (II) ion in water

    • Abstract: Abstract Mercury (Hg) contamination of the major environmental matrices, arising from human indiscriminate pursuit of industrialization without recourse to environment beneficiation is rife and worrisome. Amongst all the different forms of Hg, huge interest has been devoted to the inorganic Hg2+ determination, especially in water. Herein, a creatinine (CRN) conjugated on 3,3′-dithiodipropionic acid di(N-hydroxysuccinimide ester) (DTSP) functionalized gold nanoparticles (Au@DTSP/CRN)-based colorimetric assay was developed for Hg2+ detection in water samples. The DTSP was used to functionalize gold nanoparticles through the Au–S interaction, so as to impart a significantly high stability on the fabricated Au@DTSP, while also conferring coordination capacity on the nanoparticles. The Au@DTSP can bind to the amino group of CRN through its N-hydroxysuccinimide ester moiety, with the formation of an amide bond. The generated optical probe Au@DTSP/CRN aggregated in the presence of Hg2+, with a distinct change of solution colors from ruby red, through purple and to blue-grey within 10 min. The detection limit of 28.5 nM was achieved with linear calibration curves within 0.10–0.35 and 0.35–4.00 μM, while using the absorbance ratio (A680/A521) as the analytical response. Recoveries of 99.0–103.2% were obtained and the relative standard deviations were less than 5.5%. The Au@DTSP/CRN nanoprobe was applied for quantitative determination of Hg2+ in real water samples without significant interference from other metal ions, which is a positive indication of its utilitarian potentiality for Hg2+ profiling in aqueous environment.
      PubDate: 2022-04-01
       
  • Nanoceria surface: the most sensitive redox-triggered one step
           nano-amplifier for fluorescence signal of ochratoxin A

    • Abstract: Abstract Sensitive detection of redox active analytes utilising its fluorescent nature requires a direct non-complicated approach to amplify its emission intensity. In this regard, we investigated nanoscale cerium oxide for its unique nanosized structure, surface reactivity and redox activity coupled with surface complexation. Variations in either oxidation state or the surface-terminated oxygen of the cerium oxide nanoparticales provide gaps for the adsorption of redox functionalities. It enables ceria particles to concentrate the analyte molecules on their surface promoting fluorescence signal amplification. As a proof of concept, we integrated surface complexation feature of nanoceria towards improved fluorescent response and successively implemented them for ultra-sensitive identification of a redox active Ochratoxin A (OTA) at specific wavelength range. Results obtained indicate that higher amplification efficacy of nanoparticles is due to its higher electron mobility along with good absorbability. Different identification techniques including XRD SEM, UV–Vis, EDX, FTIR, photoluminescence, RAMAN spectroscopy and finally fluorescence assays were performed to examine morphology and nano-surface chemistry along with signal amplified strategy of the developed nano-probe. Various experimental factors including incubation time, pH and concentrations of OTA and ceria particles were also optimised. Under optimised environment, the limit of detection was as smaller as 0.1 ng mL−1 with 0.5–100 ng mL−1of linear range. Thus, we proposed a highly sensitive and selective fluorescent nanoprobe for analytical applications based on surface complexation affinity and fluorescence signal amplification ability of nanoceria.
      PubDate: 2022-04-01
       
  • Hydrothermally synthesized ZnO-reduced graphene oxide nanocomposite for
           enhanced anticorrosion performance of waterborne epoxy coating

    • Abstract: Graphene and its derivatives can play a barrier strengthening role in waterborne epoxy resin (WEP) coatings. The main challenge for WEP coatings is not to maintain long-period corrosion resistance in the corrosive environments. Herein, this study reports a new strategy for providing mild steel with enhanced long-period corrosion resistance performance. Three of zinc oxide-reduced graphene oxide (ZnO-RGO) sheet hybrids were fabricated using the hydrothermal method, in the process of fabrication, varying the mass ratio between ZnO and GO as 1:3, 1:1, and 4:1, noted as Z3R, ZR, and 4ZR. The sheets can be stably dispersed into waterborne epoxy (WEP) coatings at a low weight fraction of 2%. The electrochemical impedance spectroscopy (EIS) test and salt spray test revealed that the anticorrosion performance was significantly improved by the addition of 4ZR into WEP coating. The anticorrosion mechanisms of the composite WEP coating were attributed to synergistic effect of chelating zinc oxide and the physical barrier protection of reduced graphene oxide. Graphical abstract Incorporation of hydrothermally synthesized ZnO-RGO nanocomposites into waterborne epoxy coating significantly enhanced the corrosion resistance of the coatings for metal protection.
      PubDate: 2022-04-01
       
  • Application of Terminalia catappa wood-based activated carbon modified
           with CuO nanostructures coupled with H2O2 for the elimination of chemical
           oxygen demand in the gas refinery

    • Abstract: This study focused on the reduction of chemical oxygen demand (COD) from gas refinery wastewater via copper oxide nanoparticles which loaded on activated carbon supplied from Terminalia catappa (CuO-NPs-TCW-AC), while accordingly understudy process was accelerated by decomposition of organic pollutants in the presence of H2O2 as oxidant. CuO-NPs-TCW-AC as heterogeneous catalyst in the combination of H2O2 lead to generating OH radical as most efficient species degradation of organic pollutants (it is expected that copper ions also exhibited somewhat Fenton-like behaviors). TCW-AC prepared by carbonization at 850 °C for 90 min and subsequently was activated with CO2 at 900 °C for 90 min and TCW-AC as the final product was oxidizing with nitric acid and hydrochloric acid solution. Characterization of adsorbent and investigation of mechanism process were undertaken by FT-IR (before and after COD removal), pHZPC, Boehm's titration method, SEM, XRD, BET, and BJH. Conduction of preliminary experiments reveals that setting experimental condition at their optimum values including 0.06 g of the CuO-NPs-TCW-AC, pH of 4 and 0.1 mol L−1 of H2O2 at 75 °C following 5 min agitation at speed of 400 rpm leads to 61.5% reduction of initial COD (320 ppm) from gas refinery wastewaters. According to the coefficients of determination (R2) for Langmuir (0.985), Freundlich (0.993) and Temkin isotherm (0.981) reveal cooperative mechanism on whole adsorption/decomposition process, while its experimental and calculating maximum adsorbent capacity were 250.1, 263.2 (mg g−1), respectively. Judgment based on correlation coefficients represents an agreement among experimental and predicted adsorption capacity and confirms that understudy COD reduction using CuO-NPs-TCW-AC follows the second-order kinetics. The negative Gibbs free energy strongly support the high tendency of present material for COD through spontaneous while, higher adsorption rate by temperature rising confirm the endothermic nature of the process. As a result, the application of CuO-NPs-TCW-AC in the combination of H2O2 is suggested as a powerful tool for COD reduction from gas refinery wastewater. Graphic abstract
      PubDate: 2022-04-01
       
  • Solar-light responsive efficient H2 evolution using a novel ternary
           hierarchical SrTiO3/CdS/carbon nanospheres photocatalytic system

    • Abstract: Abstract Carbon nanospheres (CNS) have tremendous potential in photocatalysis due to their unique opto-electronic properties that facilitated effective electron transfer and high visible-light harvesting nature. The present work deals with the design and synthesis of novel ternary hierarchical SrTiO3/CdS/carbon nanospheres photocatalytic system and evaluated its photocatalytic performance for H2 production under sunlight illumination. The ternary photocatalytic system formation is explained using surface imaging (FE-SEM and TEM) and surface chemical analysis (XPS). At optimized conditions, the ternary SrTiO3/CdS/carbon nanospheres’ photocatalytic system has exhibited excellent H2 production of 3085 μmol h−1 gcat−1 when compared to single and binary photocatalytic systems. The incorporation of carbon nanospheres takes part as an electron nabber and carrier to improve the electron transfer of the SrTiO3/CdS photocatalytic system in the hierarchical ternary photocatalytic system. The high H2 production of the ternary SrTiO3/CdS/carbon nanospheres’ photocatalytic system is demonstrated by photocurrent and lifetime PL studies. Furthermore, a suitable mechanism is also proposed.
      PubDate: 2022-04-01
       
  • Porous nanocarbon particles drive large magnitude and fast photomechanical
           actuators

    • Abstract: Abstract Better NIR (near infrared)-driven photomechanical actuation than reported for films containing carbon nanostructures such as carbon nanotubes and graphene has been achieved by incorporating porous carbon nanoparticles (PCNs) into single-layer films of polydimethylsiloxane (PDMS). The PCNs being obtained from a bio-waste source adds an exciting dimension to this work. The specific surface area (Asurf) of the pores, controlled using the pyrolization temperature and varying over a factor of 600 is seen to have a strong influence on the magnitude of the actuation as well as the time response of light-driven and relaxation processes. The quantity of the curing agent polymerizing the PDMS also has a notable role. The already significant actuation realized for single-layer films can be further enhanced (factor of two) by backing the PDMS film with an ultrathin gold layer. This addition, however, provides a novel way to control the direction of actuation, being opposite for the single and bilayer films. The mechanical properties obtained from stress versus strain measurements and the morphology of the films as imaged by electron microscopy, besides the coefficient of thermal expansion, have been employed to analyze the various observed behaviors. An important finding from the images is that the crystallinity of the PCNs plays a vital role in the magnitude of actuation: more the amorphous nature, larger is the actuation. Based on the results, which have much for bioengineering applications, a simple photo-stimulated LED switch is also presented.
      PubDate: 2022-04-01
       
  • Superior adsorptive removal of brilliant green and phenol red dyes mixture
           by CaO nanoparticles extracted from egg shells

    • Abstract: Calcium oxide (CaO) is an up-and-coming adsorbent, effectively accessible and extractable from natural resources. In this paper, the extraction and characterization of CaO extracted from eggshells and its adsorption efficiency is compared to commercially available CaO. The extracted CaO from egg shells was characterized for average hydrodynamic size through DLS, surface area (BET) (92 m2g−1), X-Ray Diffractometer (XRD), surface morphological studies (SEM), High Resolution TEM (HRTEM), electro-kinetic factor (zeta potential) and adsorption studies. The lattice strain and crystallite size for annealed (900 °C) nanospheres were assessed by W–H analysis from powder XRD data and the outcomes were found to be in good agreement with TEM results (40–50 nm). The current work reports the capability of CaO nanospheres towards removal of cationic (Brilliant Green) and anionic (Phenol Red) dye individually and their binary mixture as compared to monetarily CaO. Adsorption studies in binary system displayed that the extracted CaO showed higher adsorption (98%) of Brilliant Green (BG) than Phenol Red (PR) which is 78%, where strong electrostatic interactions played a significant role. The adsorption performance was evaluated in terms of Chemical Oxygen Demand (COD) that exhibited reduction up to 90.6% and followed Langmuir adsorption isotherm. Further, the catalysts’ reusability study was taken in pellet form so that it can be separated effortlessly from the reaction mixture. Graphic abstract Calcium oxide (CaO) nanospheres (40–50 nm) extracted from waste egg shells exhibited a better surface structural and electro-kinetic properties and efficiently adsorbed cationic and anionic dye separately, and in their binary mixture than commercial CaO. This reaction system was found to be capable in reducing the concentration of COD upto 90.6% during brilliant green and phenol red dye removal through Langmuir type adsorption.
      PubDate: 2022-04-01
       
  • Double-grafted chitosans as siRNA nanocarriers: effects of
           diisopropylethylamine substitution and labile-PEG coating

    • Abstract: The preparation of safe and efficient siRNA carriers remains a challenge that has limited the therapeutic applications of siRNA. In this study, the design of a new small interfering RNA (siRNA) carrier based on diisopropylaminoethyl-chitosan was devised for application in non-viral gene therapy. Polycations having varied proportions (11–32%) of diisopropylethylamine groups (DIPEA) and grafted with polyethylene glycol (1–3%) were synthesized and characterized. The physicochemical and biological properties of the polymers and their nanoparticles were evaluated at pH 6.3 and pH 7.4. The degrees of ionization at pH 7.4 were precisely controlled by the composition and increased from 13% for chitosan to 47% for the more substituted derivative. Nanoparticles with very low toxicities and sizes in the range of 100–200 nm, remained stable up to 24 h after their preparation in both the evaluated pHs under plasma osmolality. As probed by scanning electron and confocal microscopies, an efficient cell uptake of spherical nanoparticles mediated a TNFα knockdown of almost 60% in RAW 264.7 macrophages, and mRNA silence levels higher than the Lipofectamine (up to 90%) in HeLa cells. Overall, the results showed that these derivatives are promising vectors for in vivo studies under physiological conditions. Graphical abstract
      PubDate: 2022-03-31
       
  • Progress on boron nitride nanostructure materials: properties, synthesis
           and applications in hydrogen storage and analytical chemistry

    • Abstract: Abstract Recently, boron nitride nanostructures have proven to be promising materials in various applications including catalysis, optoelectronics, sensors, electronics and biomedical research areas due to their significant properties such as electrical, mechanical, optical, thermal and physico-chemical properties. In view of this, boron nitride nanostructures [hexagonal boron nitride (h-BN), boron nitride quantum dots (BNQDs) boron nitride nanosheets (BNNSs) and boron nitride nanotubes (BNNTs)], properties (mechanical, photoluminescence, and biocompatibility) and synthetic routes top-down (liquid-phase exfoliation, ultrasonic-, microwave-, chemical reaction-, hydrothermal/solvothermal-, mechanical-, assisted exfoliation and ion-intercalation) and bottom-up (hydrothermal/solvothermal, microwave and chemical vapor deposition) approaches are discussed in this review. The promising applications of boron nitride nanostructures in hydrogen storage and sensing (gas, inorganic species, organic and biomolecules) are summarized. Finally, future perspectives of BN nanostructures in hydrogen storage and analytical sciences are discussed.
      PubDate: 2022-03-22
       
  • Nanochemistry approach for the fabrication of Fe and N co-decorated
           biomass-derived activated carbon frameworks: a promising oxygen reduction
           reaction electrocatalyst in neutral media

    • Abstract: The sluggish nature of the cathodic oxygen reduction reaction (ORR), and the expensive price of the precious metal-based nanocatalysts are the biggest obstacles to the practical applications of cutting-edge technologies including metal–air batteries and fuel cells. Hence, it is crucial to engineering a scalable-production pathway for the fabrication of a high-performance ORR catalyst. Herein, it was aimed to boost the performance of the ORR in neutral media, especially for microbial fuel cells, by tailoring a biomass-derived ORR electrocatalyst. In this regard, with the approach of nanochemistry, which is concerned with the fabrication of building blocks that vary in size, surface, shape, and defect characteristics, iron- and nitrogen-doped activated carbon framework (Fe,N-AC) was derived from waste orange peels by a two-stage pathway comprising microwave-assisted chemical activation and the thermal annealing processes. The physicochemical characterizations confirmed the successful co-doping of iron and nitrogen atoms to the activated carbon skeleton with the hierarchically ordered porous structure. Thanks to the interdependent effects of metal and heteroatoms in the structure, as well as the enlarged specific surface area (1098 m2.g−1), Fe,N-AC catalyst offered a superior ORR activity thru the 4-electron transferring way (n = 3.969) with long-term stability (81.4% retention of initial current over the period of 7200 s). The half-wave potential was determined as 0.871 V by the introduction of iron and nitrogen to the nanoarchitecture, implying the boosting impact of the iron and nitrogen decoration. Moreover, the exceptional electrocatalytic activity of Fe,N-AC was validated by an onset potential of 0.951 V that was ca.16 mV smaller than that of Pt/C catalyst (0.967 V). The accelerated S2− poisoning test of Fe,N-AC catalyst was outperformed to Pt/C catalyst, thereby foreboding its practical utilization in MFCs. The current loss of Pt/C catalyst was determined almost five times that of Fe,N-AC catalyst at 5 mM S2− concentration. The findings paved the course for the engineering of the state-of-the-art low-cost nanocatalyst by converting agricultural biomasses to a multi-functional advanced material to be employed in sustainable energy conversion systems. Graphical abstract
      PubDate: 2022-03-19
       
  • Biodegradable antibacterial and antioxidant nanocomposite films based on
           dextrin for bioactive food packaging

    • Abstract: Food packaging is considered an inactive barrier that defends foods from environmental issues, chemical, and microbiological contaminants. In the current research, bioactive films based on dextrin (Dex), polyvinyl alcohol (PVA), and TiO2 nanoparticles with weight ratios (50:50:0, F1), (60:40:0, F2), (70:30:0, F3), (50:50:5, C1), (60:40:5, C2), and (70:30:5, C3) were constructed by a solvent casting process for application in bioactive food packaging. The FE-SEM images exhibited a relatively uniform distribution of TiO2 nanoparticles. The TGA thermogram of Dex@PVA@TiO2 nanocomposite films displayed that the thermal stability of films enhanced compared to PVA and Dex samples, owing to the presence of TiO2 nanoparticles. The water solubility of Dex@PVA@TiO2 nanocomposite films increased from 38.46 to 53 wt% with the increase of Dex content from 50 to 70 wt% while the solubility of nanocomposites decreased due to TiO2 nanoparticles compared to PVA/Dex blends. The results showed that the presence of TiO2 nanoparticles (5 wt%) into Dex@PVA films enhanced the biofilm's tensile strength, compared to Dex and PVA films. The incorporation of TiO2 nanoparticles into the Dex@PVA films enriched their antioxidant activity to 41% in ethanolic solution (EtOH 95% v/v). Additionally, the prepared films illustrated selective antibacterial activity against Enterococcus faecalis (as a food-borne pathogenic Gram-positive bacterium). These nanocomposites can be applied as a low-cost and suitable bioactive food packaging purpose in the different food packaging industries. Graphical abstract
      PubDate: 2022-03-16
       
  • SnO2 nanoflakes deposited carbon yarn-based electrochemical immunosensor
           towards cortisol measurement

    • Abstract: Abstract Textile and garment-based biosensing approaches allow the integration of diagnostic devices in wearable format, which can be used to develop non-invasive approaches for quantitative measurement of biomarkers in body fluids. Anchoring nanostructured materials on textile materials is key in designing wearable electrochemical sensing devices as the nanomaterials provide multi-faceted application including bioreceptor immobilization and signal transduction. In this work, SnO2 nanoflake-integrated conductive carbon fiber (SnO2/CCY) was explored for biosensing of cortisol. Cortisol is known as a stress hormone and plays crucial role in human physiology and immune system. Accurate detection of cortisol is crucial in personalized health monitoring and quantitative estimation of acute and chronic stress levels in humans. Anti-cortisol antibodies were immobilized onto the SnO2/CCY for improving the selectivity of the detection. The response of the electrochemical immunosensor towards cortisol binding was monitored using an electroactive redox probe (Fe(CN)63−/4−). The oxidation current of the redox probe (− 0.42 V vs. Ag/AgCl) was probed for creating sensor calibration plot. The electrochemical immunosensor responded to a broad range of cortisol concentration (10 fg/mL to 1 µg/mL) and showed a good detection limit (1.6 fg/mL) towards cortisol detection. Under optimized conditions, the immunosensor has been evaluated to measure cortisol levels in human sweat. The sensor results were correlated using commercial chemiluminescence immunoassay (CILA) method.
      PubDate: 2022-03-16
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 3.230.142.168
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-