Subjects -> CHEMISTRY (Total: 986 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (713 journals)
    - CRYSTALLOGRAPHY (23 journals)
    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (71 journals)

CHEMISTRY (713 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 29)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 9)
ACS Catalysis     Hybrid Journal   (Followers: 51)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 21)
ACS Combinatorial Science     Hybrid Journal   (Followers: 21)
ACS Macro Letters     Hybrid Journal   (Followers: 25)
ACS Materials Letters     Open Access   (Followers: 2)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 43)
ACS Nano     Hybrid Journal   (Followers: 189)
ACS Photonics     Hybrid Journal   (Followers: 15)
ACS Symposium Series     Full-text available via subscription   (Followers: 3)
ACS Synthetic Biology     Hybrid Journal   (Followers: 28)
Acta Chemica Malaysia     Open Access  
Acta Chimica Slovaca     Open Access   (Followers: 2)
Acta Chimica Slovenica     Open Access   (Followers: 2)
Acta Chromatographica     Full-text available via subscription   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 8)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 7)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 70)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 3)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 5)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 2)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 104)
Advances in Chemical Science     Open Access   (Followers: 50)
Advances in Chemistry     Open Access   (Followers: 34)
Advances in Chemistry     Full-text available via subscription   (Followers: 4)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 16)
Advances in Environmental Chemistry     Open Access   (Followers: 9)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 31)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 50)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 16)
Aerosol Science and Engineering     Hybrid Journal  
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 5)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access  
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 3)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 43)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 19)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 7)
Analyst     Hybrid Journal   (Followers: 36)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 155)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 227)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Surface Science     Hybrid Journal   (Followers: 30)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Atomization and Sprays     Full-text available via subscription   (Followers: 7)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 7)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 11)
Biochemistry     Hybrid Journal   (Followers: 203)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 22)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 93)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 66)
Bioorganic Chemistry     Hybrid Journal   (Followers: 9)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 12)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 8)
Carbohydrate Research     Hybrid Journal   (Followers: 24)
Carbon     Hybrid Journal   (Followers: 65)
Carbon Capture Science & Technology     Open Access   (Followers: 5)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 9)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 11)
Cell Reports Physical Science     Open Access  
Cellulose     Hybrid Journal   (Followers: 8)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal   (Followers: 9)
Chem Catalysis     Hybrid Journal   (Followers: 6)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 21)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 81)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 25)
Chemical Physics Impact     Full-text available via subscription   (Followers: 5)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 176)
Chemical Science     Open Access   (Followers: 39)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 74)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 7)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 54)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 21)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 125)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 19)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 17)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 6)
Chemistry Education Review     Open Access   (Followers: 1)
Chemistry in Education     Open Access   (Followers: 3)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 5)
Chemistry of Materials     Hybrid Journal   (Followers: 160)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal   (Followers: 1)
Chemistry–Methods     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription   (Followers: 8)
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 22)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 7)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comptes Rendus : Chimie     Open Access  
Comptes Rendus : Physique     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 11)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computational Chemistry     Open Access   (Followers: 4)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 11)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 6)
Corrosion Communications     Open Access   (Followers: 5)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 17)
Croatica Chemica Acta     Open Access  
CrystEngComm     Hybrid Journal   (Followers: 10)

        1 2 3 4 | Last

Similar Journals
Journal Cover
Colloid and Polymer Science
Journal Prestige (SJR): 0.597
Citation Impact (citeScore): 2
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0303-402X - ISSN (Online) 1435-1536
Published by Springer-Verlag Homepage  [2469 journals]
  • Preparation of elastic/glassy Janus composite particles by seeded
           polymerization

    • Free pre-print version: Loading...

      Abstract: Elastic/glassy Janus composite particles having snowman-like shape were successfully prepared by seeded polymerization of benzyl methacrylate (BzMA) in the presence of cross-linked silicone particles. The morphology of the composite particles was strongly affected by the affinity between silicone seed particles and monomer. In the case of the low affinity monomer, such as BzMA, snowman-like composite particles were obtained. The obtained particles were consisting of poly(benzyl methacrylate) (PBzMA) lobe and silicone phase containing PBzMA small domain. The PBzMA weight ratio of single lobe and inside silicone seed particle were determined as 90 and 70 wt%, respectively, based on the silicone seed particle. According to micro-compression test, the composite particle had both of elasticity derived from silicone phase and hard property derived from PBzMA lobe in one particle, indicating that the composite particles had two different stiffness.
      PubDate: 2022-01-17
       
  • Bimetallic nickel iron zeolitic imidazolate fibers as biosensing platform
           for neurotransmitter serotonin

    • Free pre-print version: Loading...

      Abstract: Zeolitic imidazolate frameworks (ZIFs) are widely used in recent times for catalysis and in biomolecules detection. Many neurotransmitters are associated with human body, and among them, serotonin (5-HT) (SER) plays a dynamic role in biological functions. Any alteration in its level leads to severe problems including death, so the monitoring SER is very much concerned. In this direction herein, we successfully synthesized nickel–iron-based ZIF (NiFe-ZIF) microfibers for demonstrating the sensing of neurotransmitter serotonin (SER). Further, the electrochemical behavior investigated by electrochemical studies ensures its high conductivity and sensing ability towards SER. Moreover, the SWV studies also exhibit wide linear range of 40 nM–30 µM with detection limit 3 nM confirming excellent platform role for biomedical applications. Moreover, the real-time application of the proposed sample was also investigated by serum with the exhibition of exceptional outcome of the proposed biosensor. Graphical abstract Bi-metallic NiFe based ZIF MFs have been synthesized and successfully utilized for the first time as a biosensor for an effective detection of the neurotransmitter and hormone SER with very low detection limit. The designed sensor is also applicable for the real time analysis and can be further applicable for other device fabrications such as point of care devices like glucose sensors.
      PubDate: 2022-01-15
       
  • Controlling the shell structure of hard core/hydrogel shell microspheres

    • Free pre-print version: Loading...

      Abstract: Seeded precipitation polymerization is one of the most versatile techniques for the synthesis of solid core–hydrogel shell particles, and it is required to control the shell structure, which plays an important role in functionalization. In this study, the effect of the polymerization conditions, such as the monomer and cross-linker concentrations, on the structure of the shell layer was systematically investigated. A series of experiments revealed that the lack of cross-linking points at low monomer concentrations and the formation of secondary particles at high monomer concentrations hindered the introduction of shells onto the core particles. The dependence of the monomer concentration on the shell thickness was well described by a single-exponential equation, and thus, the required concentrations of monomer and cross-linker to prepare a target thickness/cross-linking density can be predicted. Moreover, the combination of seeded precipitation polymerization and the monomer feeding method allowed further control of the shell thickness.
      PubDate: 2022-01-15
       
  • Novel nanocomposites based on poly(4,4′-diaminodiphenyl sulfone) and
           carbon black-ZnO (CB@ZnO) binary composites: synthesis, characterization,
           and mechanical, optical and electrochemical properties

    • Free pre-print version: Loading...

      Abstract: New nanocomposites based on poly(4,4′-diaminodiphenyl sulfone) (PDDS) and carbon black-ZnO (CB@ZnO) binary composite were formulated by incorporating CB@ZnO into pure PDDS. Samples have been prepared by chemical polymerization. Furthermore, FTIR, XRD, SEM, UV–visible and TGA confirmed the successful synthesis of PDDS/CB@ZnO nanocomposites. The tensile strength test indicate that the incorporation of CB@ZnO into PDDS chain was found to improve Young’s modulus from 1.58 Gpa for pure PDDS to 2.91 Gpa and 4.34 Gpa for PDDS/CB@ZnO 5% and PDDS/ CB@ZnO 10%, respectively. Interestingly, optical property data indicated that PDDS and PDDS/CB@ZnO nanocomposites have mainly direct energy band gaps permitting transitions in the energy range of 3.88–3.83 eV. Besides, the CV results show that these hybrid materials exhibited high electroactivity. All the results demonstrated that the PDDS/CB@ZnO nanocomposites are very promising for electrochemical applications.
      PubDate: 2022-01-14
       
  • Fabrication of a sugar-immobilized fluorescent PMMA shell on a Ni core
           particle via soap-free emulsion polymerization

    • Free pre-print version: Loading...

      Abstract: Sugar chain immobilized polymer particles having both magnetic and fluorescent properties can be expected to be useful in a wide variety of biomedical applications such as the detection, separation, and purification of proteins, viruses, or bacteria, because sugar chains specifically adsorb them. Since high magnetic responsiveness is required for such applications, we attempted to fabricate core-shell particles consisting of a submicron-sized magnetic core and a thin polymer shell (nano- to dozens of nanometers thick) that incorporates a fluorescent dye, with sugar molecules immobilized on the surface. Soap-free emulsion polymerization using methyl methacrylate (MMA) monomer and potassium persulfate (KPS) initiator in the presence of aminopropyltrimethoxysilane-treated Ni particles, octyl-β-D-glucopyranoside (octyl-glc), and rhodamine B (RhB) produced a glucose-immobilized fluorescent PMMA thin shell on a Ni particle (Ni/PMMA/RhB/octyl-glc). Electrostatic interaction was used both to incorporate RhB into the PMMA shell and to coat the Ni core with the PMMA-RhB shell. Glucose was immobilized on the PMMA shell by embedding a hydrophobic octyl group derived from octyl-glc in the PMMA matrix, and the resulting sugar-immobilized PMMA shell was able to adsorb protein (concanavalin A; a protein that specifically adsorbs glucose). The resulting Ni/PMMA/RhB/octyl-glc particles were well-dispersed in water, detected by highly sensitive fluorescence techniques, and could be collected by a magnet within 10 sec. They are expected to be applied to detect biological substances such as various proteins and viruses by changing the glucose moiety of the particle surface to other functional glycans.
      PubDate: 2022-01-14
       
  • UV-activated coating polymer particle containing quaternary ammonium for
           antimicrobial fabrics

    • Free pre-print version: Loading...

      Abstract: Antimicrobial spray for material coating was developed using polymer particles containing quaternary ammonium (QA) and benzophenone (BP) groups on their surfaces. The obtained particles can be coated onto substrate with a covalent bond via the BP group, and the QA group displays antimicrobial behavior. First, the macro chain transfer agent (macro CTA) of poly(2-methacryloyloxy dodecyl dimethyl ammonium chloride-4-allyloxy-2-hydroxybenzophenone)-iodide (P(QAC12-BP)-I) was synthesized by solution iodine transfer polymerization. It was then used as a macro CTA for the preparation of poly(styrene-butyl methacrylate) [P(S-BA)] particles by emulsion iodine transfer polymerization. The obtained P(S-BA) particles were nearly uniform (0.090 of polydispersity index; PDI), having a size of about 101 nm. A positive charge of +70 mV was observed due to the presence of the QA group derived from P(QAC12-BP) segments on their surfaces. In addition, the QA group on the particle surface represented antimicrobial activity against microorganisms such as Staphylococcus aureus and Escherichia coli. This particle can coat fabrics via UV initiation without a binder and demonstrates high washing durability, with over 80% of particles remaining after 10 washing cycles.
      PubDate: 2022-01-14
       
  • Frontal polymerization synthesis of scandium polyacrylamide nanomaterial
           and its application in humidity testing

    • Free pre-print version: Loading...

      Abstract: The present article addresses the preparation of nanostructured scandium polyacrylamide deposited on borosilicate glass substrates of 1.0 cm × 1.0 cm × 0.2 cm dimensions to investigate the variations in the electrical parameters with adsorption/desorption of water in a controlled humidity glass chamber. Field emission scanning electron microscopy (FESEM) analysis showed that the material had spherically shaped clusters. X-ray diffraction (XRD) revealed the amorphous nature of the polymer whereas crystalline nature of the metal part in complex. Minimum particle size was reported as 2 nm by Zeta nanosizer which was further confirmed by high-resolution transmission electron microscopy (HRTEM). Energy band gap of the film was anticipated as 4.03 eV by UV–Vis spectrophotometer. Fourier transform infrared (FTIR) spectroscopy confirmed the presence of the amide group in the material’s chemistry. The film was employed as an electrical humidity sensor. Maximum sensitivity was calculated as 1.85 MΩ/%RH with ~ 96.76% reproducible results. This testing device showed the humidity response and recovery times as 24 s and 101 s, respectively.
      PubDate: 2022-01-13
       
  • Strong conductive hybrid hydrogel electrode based on inorganic hybrid
           crosslinking

    • Free pre-print version: Loading...

      Abstract: Polyaniline/poly(vinyl alcohol)/TiO2 (PANI/PVA/TiO2) hybrid hydrogels with improved mechanical and electrochemical properties were fabricated via in situ oxidative polymerization of aniline (ANI) and in situ synthesized TiO2 with sol–gel method. Due to the combination of hydrogen bonds and electrostatic interactions among PANI, PVA, and TiO2, this inorganic hybrid crosslinking structures enabled the PANI/PVA/TiO2 hybrid hydrogel to possess reinforced tensile/compressive strength (26.5 kPa/8.2 MPa) and unprecedented self-healing performance. Moreover, with the optimized conductive pathways in the hybrid hydrogel, its conductivity was up to 1.38 S/m, which meets the requirement of being utilized as high-performance flexible solid-state supercapacitors. At current density of 0.5 A/g, the hydrogel-based supercapacitor provided a large capacitance of 41.0–127.5 F/g and a high energy density of 0.9–2.8 Wh/kg, which were superior to other flexible supercapacitors. The easily fabricated PANI/PVA/TiO2 conducting hydrogels provides a novel strategy to prepare hydrogel electrodes for flexible energy storage devices. Graphical abstract
      PubDate: 2022-01-12
       
  • Diffusiophoretic velocity of a spherical soft particle

    • Free pre-print version: Loading...

      Abstract: The general expression is derived for the diffusiophoretic velocity of a spherical soft particle (that is, a spherical hard particle consisting of the particle core covered with an ion-penetrable surface layer of polyelectrolytes) in an electrolyte concentration gradient. For a weakly charged soft particle, the obtained general expression for the diffusiophoretic velocity is shown to reproduce the results derived by Huang and Keh (J Phys Chem B (2012) 116: 7575–7589). A simple approximate analytic expression is obtained for the diffusiophoretic velocity applicable for the case where the particle core radius and the thickness of the polyelectrolyte layer are much larger than the Debye length and the Brinkman screening length.
      PubDate: 2022-01-12
       
  • Morphology transition of polyion complex (PIC) micelles with
           carboxybetaine as a shell induced at different block ratios and their
           pH-responsivity

    • Free pre-print version: Loading...

      Abstract: In this study, we investigated the morphology transition of polyion complex (PIC) micelles with the change in block ratio and pH-responsivity of PIC micelles or vesicles using entirely ionic diblock copolymers composed of carboxybetaine and ionic blocks. We used 2-((2-(methacryloylo-xy)ethyl)dimethylammonio)acetate (PGLBT) as carboxybetaine, poly(sodium styrenesulfonate) (PSSNa) as the anionic polymer, and poly[3-(methacrylamido)propyltrimethylammonium chlorid-e] (PMAPTAC) as the cationic polymer. The effect of pH on the PGLBT homopolymer and the PGLBT-containing diblock copolymer was examined by DLS, ELS, and transmittance, and a rapid change of state was observed between pH 4 and 2. At this pH, the carboxyl group of PGLBT was protonated to form a hydrogen bond in the molecule. Furthermore, at a lower pH, diblock copolymer behaved like a cationic polymer. The formation behavior of PIC micelles at different block ratios in the diblock copolymers was investigated by DLS, SLS, TEM, and AFM. PIC vesicles formed when the block ratio of ionic blocks to the PGLBT block was equal or larger (the content of PGLBT was 52% or less). On the other hand, PIC micelles were formed when the block ratio of PGLBT to ionic blocks was larger (the content of PGLBT was 68% or more). The pH-responsivity of PIC micelles was different from that of PIC vesicles. The size of PIC vesicles decreased by lowering pH and increased when the below pH 3. The behavior was the same as the change of state of PGLBT homopolymer with the change in pH. However, the size of PIC micelles increased by lowering pH from pH 6 to 3 and decreased at pH below pH 3. The PGLBT, which became the shell, changed its state with the change in pH and affected the aggregation number of micelles. Graphical
      PubDate: 2022-01-12
       
  • The effect of mixed sodium dodecyl sulfate–polyethylene glycol systems
           on kinetic of oxidation of o-Cresol by cerium(IV) in H2SO4 medium

    • Free pre-print version: Loading...

      Abstract: The kinetics of the oxidation of o-Cresol by cerium(IV) have been investigated spectrophotometrically at 298K in the absence and presence of sodium dodecyl sulfate (SDS) and polyethylene glycols (PEGs) in sulfuric acid medium to examine the catalytic behavior of SDS, PEG (600, 1500, and 4000), and the mixed systems of PEG 600, 1500, and 4000 with SDS. The reaction was first order with respect to [cerium(IV)] and fractional order with respect to [o-Cresol] and [H2SO4]. However, the effect of SDS catalysis was explained via Piszkiewicz’s cooperativity model to calculate the cooperative index (n) and dissociation constants (kD) of substrate–surfactant aggregates, while the catalytic activity of PEGs was also examined by use of the Benesi–Hildebrand model. In general, reaction rate enhancements have been observed in the oxidation of o-Cresol by cerium(IV) in the presence of SDS and PEG (600, 1500). On the other hand, the catalytic profiles of the various mixed PEG–SDS systems have shown a sudden increase in the observed rate constant (kobs) values even before the actual critical micelle concentration (CMC) of SDS. This premicellar catalysis can be interpreted on the basis of the formation of the active PEG–SDS aggregates at various [SDS] and [PEG]. A plausible mechanism of the oxidation reaction has been suggested; in addition, the major final product was salicylic acid, which is separated by column chromatography and tested by melting point, ultraviolet–visible, and FTIR spectra to compare with the original sample of salicylic acid.
      PubDate: 2022-01-11
       
  • Janus particles by simplified RAFT-based emulsion polymerization process
           for polymer coating

    • Free pre-print version: Loading...

      Abstract: We describe a simplified method to synthesize film forming polymer Janus particles by phase separation during RAFT-based free radical emulsion polymerization. Fully crosslinked snowman- or football-shaped polystyrene Janus particles (PSJPs) were first produced in a one-step batch process using amphiphilic triblock macro-RAFT copolymers as stabilizers. Such particles were in turn employed as seeds in a continuous emulsion polymerization in which a monomer mixture of methyl methacrylate (MMA) and butyl acrylate (BA) (1/1 by weight) was constantly injected into the reaction in the presence of a water soluble initiator. The added monomers wetted seed particle surface and their polymerization led to formations of 93-nm film forming single- or two-headed Janus particles. The resulted latex was successfully used to disperse and encapsulate solid calcite extender. Graphical abstract
      PubDate: 2022-01-11
       
  • Aqueous dispersing mechanism study of nonionic polymeric dispersant for
           organic pigments

    • Free pre-print version: Loading...

      Abstract: Polymeric dispersants with varying side chain lengths were prepared via solution polymerization, by using styrene and varying molecular weight of hydroxy polyethylene glycol methacrylate (HO-PEG-MA) as comonomers. The dispersants were used for the effective dispersion of organic pigment, e.g., C.I. Pigment Violet 23. Benzene ring was anchoring moiety while PEG chain was hydrophilic stabilizing moiety, in the dispersant structure design. The chemical structure and surface tension of dispersants were characterized, to correlate their relationship with result pigment preparation performance. It showed that longer side chain length could result in smaller particle size and stronger stabilizing effect. The theory calculations based on Derjaquin-Landau-Verwey-Overbeek indicated that longer side chain length dispersant provided higher steric stabilization energy, which was consistent with experimental results. Graphical abstract
      PubDate: 2022-01-08
       
  • Glycidyl methacrylate-based polyHIPEs: a facile redox-initiated
           polymerization of the oil phase in a water-in-oil emulsions and amine
           functionalization

    • Free pre-print version: Loading...

      Abstract: In this article, a simple and efficient method for the synthesis of highly porous monoliths based on glycidyl methacrylate (GMA) crosslinked with divinylbenzene (DVB) or ethylene glycol dimethacrylate (EGDMA) is presented. Redox-initiated polymerization in the external (oil) phase of a high internal phase emulsion (HIPE) is used. The use of the oil-soluble redox couple benzoyl peroxide/dimethyl-p-toluidine eliminates the need to heat the usually unstable GMA-based HIPEs during polymerization. The most striking feature of these cured GMA polyHIPEs is their open-cell, highly interconnected porous structure. The polyHIPEs crosslinked with EGDMA contain voids with a diameter of 10 to 13 µm, and the polyHIPEs crosslinked with DVB contain voids with a diameter of 10 to 22 µm. In both cases, the surfaces of the voids have a high density of windows with a diameter of 0.5 to 1 µm. Highly crosslinked poly(GMA-co-EGDMA) monoliths showed negligible volume shrinkage when heated to 200 °C. In order to obtain monoliths with ion-exchange groups on the surface of the pores for chromatography applications, functionalization with different multifunctional diamines was performed. FTIR spectroscopy and nitrogen content analysis were used to monitor the functionalization processes.
      PubDate: 2022-01-08
       
  • Dispersion states of lecithin–soybean oil mixtures in water

    • Free pre-print version: Loading...

      Abstract: We have investigated the dispersion state in aqueous solutions of lecithin–soybean oil mixtures in a wide range of mixing ratios, by small angle X-ray scattering as well as static and dynamic light scattering. While lecithin is dispersed as uni- and multi-lamellar vesicles in water, the uni-lamellar vesicle coexists with the spherical swollen micelle in the aqueous solution of the lecithin–soybean oil mixture with the weight fraction ξO of the soybean oil in the mixture = 0.5. In the aqueous solution, soybean oil is included in the hydrophobic layer of the vesicle and the hydrophobic core of the micelle. When ξO exceeds 0.5, the only spherical swollen micelle exists in the aqueous solution. Graphical abstract
      PubDate: 2022-01-07
       
  • Wettability modification of polystyrene surface by cold atmospheric
           pressure plasma jet

    • Free pre-print version: Loading...

      Abstract: In this work, we have studied the modification process of polystyrene surface by cold atmospheric pressure plasma jet to achieve a hydrophilic surface. For this purpose, dielectric barrier discharge plasma jet with different powers in short times with radio frequency power supply and argon plasma irradiation in atmospheric pressure were used. It was found that polystyrene surface changed from hydrophobic into hydrophilic after 20-s plasma irradiation and the wettability of surface increased with time. Surface evaluation was done by measuring the water contact angle of the samples before and after the modification. Fourier transform infrared spectroscopy showed the proof for the induction of oxygen-based functional groups in polystyrene when treated with the argon plasma. Plasma parameters were examined using optical emission spectroscopy, voltage-current (VI), and temperature measurements. The relation between plasma parameters and surface modification of the polymer is also discussed.
      PubDate: 2022-01-07
       
  • Effect of Fe3O4/CNC ratio on properties of olive oil-in-water Pickering
           emulsions

    • Free pre-print version: Loading...

      Abstract: The paper discusses the formation, stability, surface and rheological characteristics, as well as in vitro behavior in the gastrointestinal tract of magnetite/cellulose nanocrystals (MCNC)-stabilized olive oil-in-water Pickering emulsions. It has been shown that MCNC-stabilized olive oil-in-water emulsions with a mass percentage of magnetite in the composite of 37–83% are the most resistant to delamination during storage. An increase in the number of acid–base centers is observed for hybrid particles on the oil surface due to their orientation and the formation of a 2D structure. The dynamic viscosity and thixotropic properties of emulsions increase as the zeta potential of drops approaches zero. The stability of emulsions in vitro in oral and gastric phases of gastrointestinal tract and destruction in the medium of the small intestine has been shown. The resulting emulsions can be promising in various biomedical applications due to their high stability, magnetic control, and low toxicity. Graphical
      PubDate: 2022-01-05
       
  • Fabrication PDA-polyurea microcapsules with anti-photolysis and
           sustained-release performances via Pickering emulsion template

    • Free pre-print version: Loading...

      Abstract: In this study, the pyraclostrobin@polydopamine-polyurea microcapsules (Pyr@PNPMC) with anti-photolysis and sustained-release properties were prepared by interfacial polymerization based on O/W Pickering emulsion templates. The effects of water–oil ratio, stirring speed, temperature, and polydopamine nanoparticles (PDANPs) content on the preparation of microcapsules were systematically investigated. Under this condition, the encapsulation efficiency of microcapsules could reach up to 77.7%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) images indicated that Pyr@PNPMC were prepared successfully, and the microcapsules were a regular sphere with a large number of PDANPs attached to the dense inner layer. According to the results of sustained-release and anti-photolysis experiments, the release rate of Pyr@PNPMC was slightly faster than that of the pyraclostrobin@polyurea microcapsules (Pyr@MC). Under UV light exposure for 7 h, Pyr@PNPMC still retains 83% of the active ingredient, while for Pyr@MC nearly 75% of the active ingredient had been lost.
      PubDate: 2022-01-01
       
  • Synthesis and characterization of vinyl acetate/N-phenylmaleimide
           copolymers and the corresponding polyvinyl alcohol/N-phenylmaleimide with
           color cycle change property

    • Free pre-print version: Loading...

      Abstract: N-phenylmaleimide (NPMI) has a specially five-membered ring and N-aryl substituted structure, which allows its homopolymers and copolymers to exhibit remarkable thermal resistance properties. By introducing a desired amount of NPMI into polyvinyl acetate (PVAc) and polyvinyl alcohol (PVA) main chain, their thermal resistance properties will hopefully be significantly improved. There is a very large gap in the reactivity ratios between NPMI (rNPMI = 86.12) and vinyl acetate (VAc, rVAc = 0.001) in methanol by counting experimental results. As a result, the co-polymerization of NPMI (a relatively high reactive monomer) with low-reactive VAc remains a great challenge in industrial synthesis. In this paper, VAc was copolymerized with different mole ratios NPMI by starvation feeding method. The DSC curves indicated that the introduction of 4% NPMI improved Tg of PVAc/NPMI by about 10 °C. After hydrolysis, the corresponding PVA/NPMI also exhibits higher Tg compared to that of pure PVA under identical polymerization conditions. Interestingly, a visible and rapid discoloration can be observed after the incorporation of a base catalyst during the alcoholysis of PVAc/NPMI, and such color change is reversible under acid or base conditions. The mechanism of color change has been ascribed to interconversion between keto and enol under the interplay of acid or base conditions.
      PubDate: 2022-01-01
       
  • Removal of some approximations in calculation of the effect of a block
           copolymer on the interfacial tension in polymer blends

    • Free pre-print version: Loading...

      Abstract: Block and graft copolymers with blocks that are identical, miscible with, or adhere to related components of a polymer blend can serve as compatibilizers. In the previously used models established by Leibler and Noolandi, simple solutions were published for special cases called dry brush and wet brush regime. We have tried to find a more general solution which is still relatively uncomplicated. The solution found is consistent with the dry brush regime for higher copolymer concentrations at the interface and shorter copolymer, and with the wet brush regime for lower copolymer concentrations and longer copolymer. Graphical abstract Block and graft copolymers with blocks that are identical, miscible with or adhere to related components of a polymer blend can serve as compatibilizers. In the previously used models established by Leibler and Noolandi, simple solutions were published for special cases called dry brush and wet brush regime. We have tried to find a more general solution which is still relatively uncomplicated. A solution has been found which is consistent with the dry brush regime for higher copolymer concentrations at the interface and shorter copolymer, and with the wet brush regime for lower copolymer concentrations and longer copolymer.
      PubDate: 2021-11-22
       
 
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: 54.92.164.9
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-