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  Subjects -> PHYSICS (Total: 793 journals)
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PHYSICS (572 journals)                  1 2 3 4 5 6 | Last

Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 8)
Acta Mechanica     Hybrid Journal   (Followers: 17)
Advanced Composite Materials     Hybrid Journal   (Followers: 51)
Advanced Functional Materials     Hybrid Journal   (Followers: 47)
Advanced Materials     Hybrid Journal   (Followers: 199)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access  
Advances in Condensed Matter Physics     Open Access   (Followers: 6)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 4)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 16)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 3)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 15)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 17)
Advances in OptoElectronics     Open Access   (Followers: 4)
Advances In Physics     Hybrid Journal   (Followers: 9)
Advances in Physics Theories and Applications     Open Access   (Followers: 8)
Advances in Remote Sensing     Open Access   (Followers: 11)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 33)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 10)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 2)
Annalen der Physik     Hybrid Journal   (Followers: 4)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 3)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 2)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4)
Annals of Physics     Hybrid Journal   (Followers: 5)
Annals of West University of Timisoara - Physics     Open Access  
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 1)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 8)
Applied Composite Materials     Hybrid Journal   (Followers: 39)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 29)
Applied Physics Research     Open Access   (Followers: 4)
Applied Physics Reviews     Hybrid Journal   (Followers: 10)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 6)
Applied Remote Sensing Journal     Open Access   (Followers: 12)
Applied Spectroscopy     Full-text available via subscription   (Followers: 16)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 3)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access  
Astronomy & Geophysics     Hybrid Journal   (Followers: 4)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 2)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 4)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 4)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 11)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 35)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 16)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 6)
Boson Journal of Modern Physics     Open Access  
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Bulletin of Materials Science     Open Access   (Followers: 41)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (Followers: 1)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 2)
Cells     Open Access   (Followers: 1)
CERN courier. International journal of high energy physics     Free   (Followers: 4)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 1)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 2)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Computational Physics     Full-text available via subscription   (Followers: 1)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 3)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 1)
Complex Analysis and its Synergies     Open Access  
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 122)
Composites Part B : Engineering     Hybrid Journal   (Followers: 142)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 22)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription  
Computer Physics Communications     Hybrid Journal   (Followers: 1)

        1 2 3 4 5 6 | Last

Journal Cover Colloid Journal
  [SJR: 0.31]   [H-I: 19]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3067 - ISSN (Online) 1061-933X
   Published by Springer-Verlag Homepage  [2280 journals]
  • The effect of the degree of ionicity of ceramic materials on their
           wettability by melted sodium chloride
    • Abstract: Abstract The sessile drop method has been used to study the wettability of hexagonal boron nitride, sapphire, quartz, and polycrystalline silicon carbide by melted sodium chloride in a reducing He–H2 atmosphere. Melted NaCl completely spreads over sapphire and quartz surfaces and form finite contact angles equal to 51° ± 10° and 77° ± 5° on silicon carbide and hexagonal boron nitride, respectively. The calculated works of salt adhesion to the ceramic substrates increase with the magnitude of the ionic component of ceramic material surface energy.
      PubDate: 2016-01-01
       
  • The equilibrium characteristics of pyridoxine hydrochloride sorption on
           clinoptilolite
    • Abstract: Abstract Pyridoxine hydrochloride (vitamin B6) sorption by clinoptilolite from aqueous solutions has been studied at 283, 295, and 317 K. Enhancement of the sorption with decreasing temperature has been found. Isotherm of pyridoxine hydrochloride adsorption from dilute solutions may be described by the Langmuir theory. It has been shown that the monolayer coverage of clinoptilolite surface with pyridoxine occurs via the equivalent exchange with extra-framework cations of the sorbent. Thermodynamic parameters of vitamin monolayer adsorption have been determined. It has been concluded that the polymolecular adsorption is due to the formation of pyridoxine associates in the sorbent mesopores.
      PubDate: 2016-01-01
       
  • The Effect of water–glycerol mixtures on rheological properties of
           coal slurries
    • Abstract: Abstract The rheological behavior of slurries of coal at different stages of metamorphism has been studied as depending on glycerol content in an aqueous dispersion medium. Increased viscosity and reduced polarity of water–glycerol solutions have been found to increase the shear stress and viscosity of coal slurries. The effective viscosity of the slurries has been revealed to decline at the same weight content of the dispersed phase with a rise in the stage of coal metamorphism (i.e., when passing from brown coal to anthracite).
      PubDate: 2016-01-01
       
  • Fast coagulation of gold sols. Rate constants for dimerization of
           nanoparticles
    • Abstract: Abstract By using the generalized Mie theory, the extinction cross sections for dimers of 46-nm gold particles immersed in water have been calculated. It has been found that, in the region of high-energy plasmon resonance band, the maximum value of normalized extinction cross section Qext1 gradually decreases as particles approach each other. The greatest changes in Qext1 are observed when interparticle distance h decreases from 10 to 3 nm. At shorter distances, Qext1 weakly depends on h. At the same time, the band position varies in a complicated manner; however, at h < 2.5 nm, it coincides with that for individual particles. The revealed properties of the high-energy plasmon resonance band for dimers have been used to determine the absolute rate constant for dimerization of 46-nm gold particles k 11. By spectrophotometry, we have investigated salt-induced coagulation of gold sols and have measured the rates of the decrease in optical density. Experimental and calculation data allowed us to establish, at initial stages of fast coagulation, when the distance between the surfaces of 46-nm gold particles is 1.3–2.0 nm (Dolinnyi, A.I., Colloid J., 2015, vol.77, p. 600.), the average value of k 11 is (9.20 ± 1.34) × 10–12 cm3/s for sols with particle concentrations of (0.4–2.6) × 1010 cm–3.
      PubDate: 2016-01-01
       
  • Mathematical simulation of atomic hydrogen diffusion transfer through a
           bimetallic membrane
    • Abstract: Abstract Mathematical simulation of atomic hydrogen diffusion transfer through a bimetallic membrane is performed under the approximation of an ideal lattice gas. Analytical expressions are derived for diffusion fluxes at different membrane orientations. The intensity of diffusion transfer of hydrogen atoms through a bimetallic membrane depends on the direction of transfer, provided that they have different solubilities in metal layers. It is shown that the effect of diffusion asymmetry must be taken into account when developing and using bimetallic membranes.
      PubDate: 2016-01-01
       
  • Calculation of isosteric heats of molecular gas and vapor adsorption on
           graphite using density functional theory
    • Abstract: Abstract Isosteric heats of hydrogen, nitrogen, and methane adsorption on graphite surface have been calculated and analyzed using the density functional theory. The heats of adsorption have been calculated within wide ranges of pressures and subcritical temperatures. The peaks in the temperature dependences of isosteric heat of adsorption have been found to correlate with the degrees of filling of monolayers during adsorption.
      PubDate: 2016-01-01
       
  • Simulations of the PDF functions for dilute colloidal suspensions of
           molecular particles flowing in mesopores with rough surface boundaries
    • Abstract: Abstract Simulations have been carried out to analyze the dynamics of dilute colloidal suspensions of macromolecular particles in solutions flowing in pores, subject to hydrodynamic forces, Brownian motion and stochastic collisions at rough pore boundaries in a two-dimensional spatial frame. A theoretical model is developed and intensively analyzed for the treatment of the mechanical restitution of the particles due to dynamic collisions at these boundaries. In particular we are able to calculate the Probability distribution functions for the spatial positions and the orientations of rod-like particles inside the pores. The results are presented for different widths of pore channels referenced to the size of a rod-like particle. These simulations are general in the sense that they are developed for confining and open pore channels, rough at the nano scale. The simulations also permit calculating the nematic order parameters for colloidal suspensions; the model calculation is applied for dilute colloidal suspensions of carbon nano-tubes in an aqueous single-stranded DNA solution flowing inside pores. Our calculated nematic order results for dilute suspensions of particles of known lengths flowing inside porous systems should indicate, when coupled to birefringence and dichroism experimental results, the possibility to estimate the pore widths for these systems.
      PubDate: 2016-01-01
       
  • Hydration of Cl – ion in a planar nanopore with hydrophilic walls.
           1. Molecular structure
    • Abstract: Abstract Computer simulation has been employed to obtain equilibrium molecular configurations, as well as spatial and angular distributions of water molecules, under the action of the field of a single-charged chlorine anion in a model planar nanopore with structureless walls at room temperature. A detailed many-body model of intermolecular interactions calibrated in accordance with experimental data relative to the free energy of hydration in water vapor has been used. The effect of the hydrophilicity of the walls on the ion hydration shell consists in its disintegration into two parts, i.e., molecules retained exclusively due to the interactions with the ion and those adsorbed on the walls. In the regime of strong interactions with the walls, two relatively stable states arise with asymmetric distribution of molecules between opposite walls. The existence of the two metastable states destabilizes the position of ions inside a pore and is expected to accelerate their adsorption on the walls.
      PubDate: 2016-01-01
       
  • A Study of cryostructuring of polymer systems. 41. Complex and composite
           poly(vinyl alcohol) cryogels containing soluble and insoluble forms of
           chitosan, respectively
    • Abstract: Abstract Complex macroporous poly(vinyl alcohol) (PVA) cryogels have been obtained by cryogenic treatment (freezing at–20°C for 12 h followed by defrosting at a rate of 0.03°C/min) of PVA–chitosan hydrochloride mixed solutions. The subsequent alkaline treatment of the cryogels has resulted in the transformation of the water-soluble salt form of chitosan into its insoluble basic form, which coagulates inside the bulk of the continuous phase of PVA cryogel into small particles with sizes of 2–5 µm. In the resulting composite cryogels, these particles play the role of an “active” filler, which increases the rigidity and heat endurance of the gel material. It has been shown that the sorption capacity of such chitosan particles entrapped into the bulk of composite cryogels with respect of bivalent copper ions is noticeably higher than the sorption capacity of ground chitosan particles incorporated as a discrete filler into the continuous phase PVA cryogels. The study of the properties of PVA–chitosan hydrochloride mixed solutions revealed that these polymers are, to a large extent, compatible with one another in a common solvent at a low ionic strength. Therefore, liquidliquid phase separation of these systems due to the thermodynamic incompatibility of macromolecules of different natures is observed only upon increasing the ionic strength by adding a low-molecular-mass salt (NaCl, 0.15 mol/L) to the solution.
      PubDate: 2016-01-01
       
  • Computer simulation of ligand shells of colloidal cadmium selenide quantum
           dots
    • Abstract: Abstract The full-atomic molecular dynamics approach has been employed to study the structure and composition of ligand shells of colloidal cadmium selenide quantum dots produced by high-temperature colloidal synthesis in a trioctylphosphine–trioctylphosphine oxide mixture. The influence of solvents (chloroform and methanol) on the composition of the shells has been investigated. The number of ligand molecules optimal for complete covering the surface of a considered particle without its deformation has been found. The fraction of passivated surface ions has been calculated.
      PubDate: 2016-01-01
       
  • Hydration of Cl – ion in a planar nanopore with hydrophilic walls.
           2. Thermodynamic stability
    • Abstract: Abstract The Monte Carlo bicanonical statistical ensemble method has been employed to calculate the dependences of the Gibbs free energy, formation work, and entropy on the size of a hydration shell grown from water vapor on single-charged chlorine anion in a model planar nanopore with hydrophilic structureless walls at 298 K. A refined model comprising many-particle polarization interactions and calibrated with respect to experimental data on the free energy and enthalpy of the initial reactions of attachment of water molecules to the ion has been used. It has been found that a weak hydrophilicity of pore walls leads to destabilization of the hydration shell, while a strong one, on the contrary, causes its stabilization. The physical reason for the instability in the field of hydrophilic walls qualitatively differs from that under the conditions of hydration in bulk water vapor.
      PubDate: 2016-01-01
       
  • Mesostructured SiO 2 -based nanocontainers synthesized on a functional
           template: Capacity and rate of unloading
    • Abstract: Abstract A new approach to template synthesis of mesostructured pH-sensitive SiO2 nanocontainers is developed. The approach combines the stages of synthesis of the nanocontainers and their loading with a targeted functional substance. The structure, capacity, and the rate of “unloading” of the nanocontainers at different pH values of an aqueous medium under static and quasi-dynamic conditions are studied using mesoporous SiO2 nanoparticles as a model. Nanoparticles are synthesized using the micelles of cetyltrimethylammonium bromide as templates. Based on the obtained information, a mechanism is proposed for release of cetyltrimethylammonium cations from SiO2 nanocontainers into the aqueous medium.
      PubDate: 2016-01-01
       
  • On the theory of surfactant mobility in micellar systems
    • Abstract: Abstract Specific features of surfactant diffusion in micellar systems are described in terms of mobility, i.e., the limiting velocity of a particle under the action of a unit force. Micellar solutions of nonionic and ionic surfactants are analyzed. A relation is established between average surfactant mobility and the mobilities of individual particles. Although micelles have a lower mobility than monomers have, the average mobility of surfactants is shown to increase rather than decrease upon micellization. In parallel, formulas describing diffusion coefficients are derived, with part of the formulas having been available in the literature.
      PubDate: 2016-01-01
       
  • Modified polymer substrates for the formation of submicron particle
           ensembles from colloidal solution
    • Abstract: Abstract Methods for targeted regulation of the surface properties of polymer film materials (substrates) by fluorination and sulfonation have been considered. It has been shown by the examples of polyethylene, polypropylene, and poly(ethylene terephthalate) films that these methods can be used for the production of polymer films with controlled values of water contact angle from 20° to 88°, adhesion force from 23 to 141 rel. units, and surface roughness parameter R a from 35 to 382 nm. This set of substrates may be used to optimize the methods for the formation of structured functional polymer surfaces. In particular, the regularities of the formation of solid deposits of colloidal submicron particles during evaporation of droplets of their solutions have been shown to vary with variations in substrate characteristics.
      PubDate: 2016-01-01
       
  • Shear thickening and dynamic glass transition of concentrated suspensions.
           State of the problem
    • Abstract: Abstract Contemporary interpretation of shear thickening and deformation (dynamic) glass transition phenomena in concentrated suspensions has been considered. The concentration limits that predetermine structuring resulting from volume effects, which control percolation and the randomly limiting volume filling, have been formulated. The former of them is responsible for the appearance of the yield point, while the latter determines the possibility of the dynamic glass transition, which leads to “jamming,” i.e., impossibility of a flow. Physicochemical interactions lead to the fact that the yield point may appear at dispersion phase concentrations many orders of magnitude lower than the percolation threshold, while the interactions and friction between dispersed phase particles result in the glass transition at concentrations lower than the randomly limiting volume filling. The contemporary ideas of the possibility or impossibility of the existence of the maximal Newtonian viscosity at stresses below the yield point and the concept of the kinetic (thixotropic) transition through the yield point have been discussed.
      PubDate: 2016-01-01
       
  • The influence of water–organic solvent composition on the morphology
           and luminescent properties of CdS nanoparticles obtained by chemical
           precipitation
    • Abstract: Abstract Cadmium sulfide (CdS) nanoparticles have been obtained by chemical precipitation onto the surface of single-crystalline silicon from an aqueous solution of ammonia, cadmium chloride (CdCl2), and thiourea, as well as from water–DMSO and water–DMF mixtures with the same concentrations of the reagents. According to data of atomic force microscopy, the samples obtained from the aqueous solution consist of individual nanoparticles and agglomerates thereof with sizes of no larger than 1 µm. Materials obtained from the water–organic mixtures are distinguished by the aggregation of CdS nanoparticles into threadlike chains. The length of the formed curved chains and the size of CdS nanoparticles composing them depend on the nature and amount of an organic component of a mixture. Atomic force microscopy, transmission electron microscopy, and photoluminescence spectroscopy data have shown that the average size of CdS nanoparticles is 2–2.5 nm depending on solvent composition.
      PubDate: 2016-01-01
       
  • Thermodynamic and micellization studies of a cationic gemini surfactant
           16-6-16: Influence of ascorbic acid and temperature
    • Abstract: Abstract Herein, we report the study of the influence of ascorbic acid and temperature on the micellization of a cationic gemini surfactant, hexanediyl-1,6-bis(dimethylcetylammonium bromide), 16-6-16. The critical micelle concentration (CMC) of 16-6-16 was measured by the conductivity method and dye solubilisation technique. A tendency of the CMC values to increase with temperature and upon the adding of ascorbic acid was found. The standard Gibbs energy, standard enthalpy, and standard entropy of micellization of 16-6-16 were evaluated. The results of calculations suggest the decrease of the stability of the 16-6-16 micellar solution in the presence of ascorbic acid.
      PubDate: 2016-01-01
       
  • Preparation of stable sols of silver nanoparticles in aqueous pectin
           solutions and properties of the sols
    • Abstract: Abstract Silver nanoparticles have been synthesized by reducing AgNO3 in an alkaline medium under the action of a natural polysaccharide, pectin. The influences of the type of pectin used and the reagent mixing order during the synthesis on the sizes and plasmon resonance properties of nanoparticles have been studied by optical spectroscopy and transmission electron microscopy. The conditions that make it possible to obtain silver hydrosols having predetermined particle sizes of 8 ± 2 to 22 ± 6 nm and stable to aggregation for at least 3 months have been determined.
      PubDate: 2015-11-01
       
  • Formation kinetics of silver nanoparticles in reverse micelles. 3.
           Reductant concentration and temperature as factors controlling synthesis
           of nanoparticles
    • Abstract: Abstract Data on the evolution of optical absorption spectra during the synthesis of silver nanoparticles in reverse micelles at different temperatures and reductant concentrations have been presented. Analysis of the bands in the optical absorption spectra with the use of controlled-growth models (logistic and Gompertz models) has resulted in the determination of the parameters of the models and domains of their applicability. Characteristic times of silver nanoparticle synthesis have been found under different conditions. A temperature-scaling factor, which allows one to transform the optical absorption spectra into a comparable form, has been introduced. Based on the scaling of corresponding parameters with respect to the characteristic reaction time and the limiting optical absorption, consistent kinetic dependences have been obtained for different concentrations. This makes it possible to use the obtained parameters for controlling the process of nanoparticle synthesis.
      PubDate: 2015-11-01
       
  • Amphiphilic alginate as a drug release vehicle for water-insoluble drugs
    • Abstract: Abstract A preliminary study on the hydrophobic modified alginate (HM-alginate) as the drug delivery system for the model water-insoluble drugs, clofazimine and Amphotericin B was performed. It was found that HM-alginate can significantly increase the solubilities of these two drugs. The apparent water solubilities of clofazimine and Amphotericin B increased up to 1100 and 160 times, respectively, in aqueous solutions containing HM-alginate. The presence of sodium chloride in polymer solution decreased the solubilities of the drugs, compared to the salt-free solutions. HM-alginate also exhibited excellent sustained release effect, which increased with concentration. The type of HM-alginate, which we used herein, might have potential applications as water-insoluble drug delivery carrier.
      PubDate: 2015-11-01
       
 
 
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