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PHYSICS (543 journals)                  1 2 3 4 5 6 | Last

Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 15)
Advanced Composite Materials     Hybrid Journal   (Followers: 14)
Advanced Functional Materials     Hybrid Journal   (Followers: 36)
Advanced Materials     Hybrid Journal   (Followers: 365)
Advances in Condensed Matter Physics     Open Access   (Followers: 6)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 4)
Advances in High Energy Physics     Open Access   (Followers: 12)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 1)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 15)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 14)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 7)
Advances in Physics Theories and Applications     Open Access   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 8)
Advances in Synchrotron Radiation     Hybrid Journal   (Followers: 1)
AIP Advances     Open Access   (Followers: 4)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 29)
American Journal of Condensed Matter Physics     Open Access   (Followers: 2)
American Journal of Signal Processing     Open Access   (Followers: 7)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 1)
Annalen der Physik     Hybrid Journal   (Followers: 2)
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: 3)
Annals of Physics     Hybrid Journal   (Followers: 2)
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: 4)
APL Materials     Open Access   (Followers: 4)
Applied Composite Materials     Hybrid Journal   (Followers: 9)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 25)
Applied Physics Research     Open Access   (Followers: 6)
Applied Physics Reviews     Hybrid Journal   (Followers: 7)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 5)
Applied Remote Sensing Journal     Open Access   (Followers: 9)
Applied Spectroscopy     Full-text available via subscription   (Followers: 12)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 2)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Astronomy & Geophysics     Hybrid Journal   (Followers: 1)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 3)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 6)
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: 30)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 15)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Biomedical Imaging and Intervention Journal     Open Access   (Followers: 5)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 7)
BMC Nuclear Medicine     Open Access   (Followers: 5)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Bulletin of Materials Science     Open Access   (Followers: 39)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 4)
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)
Cells     Open Access   (Followers: 1)
Central European Journal of Physics     Hybrid Journal   (Followers: 1)
CERN courier. International journal of high energy physics     Free  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 1)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
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)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 50)
Composites Part B : Engineering     Hybrid Journal   (Followers: 68)
Computational Materials Science     Hybrid Journal   (Followers: 19)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal  
Computational Science and Discovery     Full-text available via subscription  
Computer Physics Communications     Hybrid Journal  
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 10)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 2)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 1)
Cryogenics     Hybrid Journal   (Followers: 14)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Differential Equations and Nonlinear Mechanics     Open Access   (Followers: 4)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  

        1 2 3 4 5 6 | Last

Journal Cover Colloid Journal
   [4 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  [2210 journals]   [SJR: 0.207]   [H-I: 18]
  • Membrane-Potential-induced electroporation as a physical mechanism for
           metal nanoparticle penetration through a cell membrane
    • Abstract: Abstract A mechanism of the penetration of nanosized metal particles from an ambient solution into the cytoplasm of a living cell, has been proposed. The driving force of this new mechanism is membrane potential, i.e., the potential difference between the cellular cytoplasm and the ambient solution. The essence of the mechanism consists in the fact that a metal particle occurring at a cell membrane shunts the potential drop in the diffuse part of the electrical double layer of the membrane. As a result, almost the entire membrane potential, which, at a normal state of the cell, is distributed between its electrical double layer and the lipid bilayer of the cell membrane, appears to be completely applied to the latter. As a consequence, the field strength in the lipid bilayer rises, thereby increasing the probability of the formation of a pore in it, through which a metal particle with a diameter lying in a certain range (in the case under consideration, from two to three tens of nanometers) can penetrate into the cytoplasm without inflicting any damage on the cell.
      PubDate: 2014-11-01
  • Accelerated nonradiative electron-excitation energy transfer between
           molecules in aqueous pools of reverse micelles containing encapsulated
           silver nanoparticles
    • Abstract: Abstract The effect of metal nanoparticles on the rate of intermolecular inductive-resonance transfer of electron-excitation energy has been experimentally studied in a system of reverse micelles. The efficiency of the energy transfer has been found to be increased in this system as compared with samples free of metal nanoparticles. A mathematical model that qualitatively agrees with experimental data has been proposed for the process.
      PubDate: 2014-11-01
  • A comparative study of adsorption of vapors of nitrogen-containing
           compounds on a microporous clay adsorbent
    • Abstract: Abstract Differential isosteric heats of adsorption of pyridine and acetonitrile vapors on a dehydrated microporous clay adsorbent with intercalated polyhydroxyaluminum cations have been determined. As has been found from the temperature dependence of adsorption, the transformation of these polycations into alumina clusters by the thermal treatment of intercalated clay reduces the micropore volume and the heats of pyridine and acetonitrile adsorption.
      PubDate: 2014-11-01
  • A study of the adsorption properties of modified layered silicate
    • Abstract: Abstract The composition and structure of vermiculite samples modified successively with hydrochloric acid and chitosan are studied with the use of X-ray fluorescence and X-ray-diffraction analyses, as well as IR spectroscopy. The adsorption characteristics of the samples with respect to nitrogen and different dyes are determined, and the parameters of their porous structure are calculated. It is shown that the acid treatment of initial vermiculite drastically increases the content of silicon (in the form of amorphous silica), changes the layered structure of the silicate, and substantially enhances its specific surface area and pore volume.
      PubDate: 2014-11-01
  • Peculiarities of the coagulation mechanism of a nanocrystalline cellulose
           hydrosol and a latex
    • Abstract: Abstract Dynamic light scattering has been employed to study the coagulation kinetics of colloidal dispersion of nanocrystalline cellulose and SKS-27 ARK synthetic latex under the action of sodium chloride. It has been found that, when a system being coagulated is exposed to a mechanical action, aggregates almost cease to grow at some moment. It has been assumed that the first stage of coagulation is caused by the formation of strong contacts between primary particles and their agglomeration, while the second stage is realized via the interaction of residual hydration layers. It has been shown that, as the density of surfactant adsorption layers on the surface of latex particles is enhanced, the duration of the first stage increases, while the average hydrodynamic particle size decreases.
      PubDate: 2014-11-01
  • The stage of nonisothermal nucleation of supercritical particles of a new
           phase under nonstationary conditions of particle diffusion growth and heat
           transfer to a medium
    • Abstract: Abstract An analytical theory has been formulated for the stage of nonisothermal nucleation of supercritical particles in a metastable medium with instantaneously generated initial supersaturation. The theory takes into account the nonuniformities of metastable substance concentration and temperature, which result from the nonstationary diffusion of the substance to growing particles and the nonstationary transfer of the heat of the phase transition from the particles to the medium. The formulated theory extends the approach based on the concept of excluded volume that has recently been used in the theory of the stage of nucleation under isothermal conditions. This approach implies that the nucleation intensity of new particles is suppressed in spherical diffusion regions with certain sizes that surround previously nucleated supercritical particles and remaining unchanged in the rest of the medium. It has been shown that, when self-similar solutions are used for nonstationary equations of substance diffusion to particles and heat transfer from the particles, the ratio between the excluded volume and the particle volume is independent of particle size, thereby enabling one to analytically solve the integral equation for the excluded volume throughout a system as a time function at the stage of nucleation. The main characteristics of the phase transition have been found for the end of the stage of nucleation. Comparison has been carried out with the characteristics obtained in terms of the isothermal and nonisothermal nucleation theory upon uniform vapor consumption and heat dissipation (the mean-field approximation of vapor supersaturation and temperature).
      PubDate: 2014-11-01
  • The band structure of submonolayer thorium coatings on a silicon oxide
    • Abstract: Abstract Data are reported on the electronic structure of thorium-containing clusters formed on the surface of natural silicon oxide via electrochemical deposition. The mutual arrangement of bands in the clusters and silicon oxide substrate is restored with the use of X-ray photoelectron spectroscopy and electron energy loss spectroscopy. It is concluded that the studied cluster/substrate system may be promising for investigating the low-lying isomeric nuclear transition in 229Th isotope.
      PubDate: 2014-11-01
  • The influence of the nature and composition of mixed surfactants on the
           stability of herbicide emulsions based on fenoxaprop-P-ethyl and
    • Abstract: Abstract The stability of herbicide emulsions with different compositions based on fenoxaprop-P-ethyl and cloquintocet-mexyl has been studied. The dynamics of the emulsion has been investigated by optical methods. It has been shown that the formation of the emulsions is accompanied by the appearance of ensembles with bimodal particle size distributions. Time variations in the parameters of the modes have been monitored. Formulations corresponding to the most stable emulsions have been determined.
      PubDate: 2014-11-01
  • Molecular structure of finely disperse Na + Cl − (H 2 O) n aerosol
           particles in water vapor
    • Abstract: Abstract The thermodynamic states corresponding to solvent separated (SSIP) and contacting (CIP) Na+Cl− ion pairs in molecular water clusters have been obtained by random walks in a configurational space with an equilibrium distribution function at 273 and 150 K. The transition to the SSIP state begins in a thresh-old-type manner in clusters containing 10–12 molecules, with the interionic distance increasing continuously up to disintegration into two hydrated ions with the growth of a hydration shell. As the cluster size increases, the hydration shell shifts from sodium ion to chlorine ion. In the first hydration layer, the electric field of the ions ruptures as many as 50% of hydrogen bonds.
      PubDate: 2014-11-01
  • Hydrodynamic permeability of a membrane composed of porous spherical
           particles in the presence of uniform magnetic field
    • Abstract: Abstract This work concerns the flow of an incompressible viscous fluid past a porous sphere in presence of transverse applied uniform magnetic field, using particle-in-cell method. The Brinkman equations are used in porous region and the Stokes equations for non-porous region. At the fluid-porous interface, the stress jump boundary condition for tangential stresses along with continuity of normal stress and velocity components are used. Four known boundary conditions on the hypothetical surface are considered and compared: Happel’s, Kuwabara’s, Kvashnin’s and Cunningham’s (Mehta-Morse’s condition). The hydrodynamic drag force experienced by a porous spherical particle in a cell and hydrodynamic permeability of membrane built up by porous spherical particles are evaluated. The patterns of streamlines are also obtained and discussed. The effect of stress jump coefficient, Hartmann number, dimensionless specific permeability of the porous particle and particle volume fraction on the hydrodynamic permeability and streamlines are discussed. Some previous results for hydrodynamic drag force and dimensionless hydrodynamic permeability have been verified.
      PubDate: 2014-11-01
  • Morphological transformations of nonequilibrium assemblies of amphiphilic
           diblock copolymer
    • Abstract: Abstract Amphiphilic diblock copolymer polystyrene-block-poly(ethylene oxide) (PS-PEO) assembled into nonequilibrium bicontinuous structures or mixture of vesicles, bilayers and nanorods upon rapid micellization induced by rapid addition of selective solvent (water) into the PS-PEO solutions in a common solvent (dimethyl formamide) with different concentrations. These kinetically trapped assemblies were unstable and slowly evolved into thermodynamically favorable spheres and vesicles. The addition of non-ionic surfactant Pluronic P123 upon rapid micellization generated novel nanocages and flower-like vesicles. The nanocages spontaneously transformed into tubules capped with vesicles. These novel assemblies are beyond the classic phase diagram of block copolymer self-assemblies, especially for those primarily based on thermodynamics.
      PubDate: 2014-11-01
  • Micellar effect on hydrolysis of 4-methyl-2-nitroaniline phosphate
    • Abstract: Abstract The effect of anionic surfactant sodium dodecyl sulfate (SDS) on the hydrolysis of a substrate (mono-4-methyl-2-nitroaniline phosphate) by HCl was studied at 303 K. The reaction followed the first-order kinetics with respect to both HCl and the substrate. SDS effectively catalyzes this reaction, which rate increases with the concentration of SDS due to an increase of dielectric constant of the medium. The kinetic data were fitted to Menger-Portnoy, Piszkiewicz and Berezin kinetic models to explain the observed micellar effects. The various activation parameters both in the presence and absence of SDS were evaluated; a reasonable mechanism was proposed. The rate constant in micellar phase, binding constant and index of cooperativity were calculated accordingly.
      PubDate: 2014-11-01
  • Tangential and nondiagonal components of pressure in a circular slit
    • Abstract: Abstract Two local tangential and one nondiagonal components of the pressure tensor have been calculated inside circular plane-parallel empty slits with dispersion forces. Symmetric and asymmetric slits have been considered. The spatial dependences have the same character for both tangential components, although their absolute values are somewhat different. It has been shown that, in the symmetric slit, the corrections for its finite size to the tangential pressure appear to be larger than those to the normal pressure. The nondiagonal pressure component becomes noticeable only near the edges of narrow slits.
      PubDate: 2014-11-01
  • The asymptotics of distribution functions in fluid-filled finite slits
    • Abstract: Abstract Asymptotic formulas have been derived for distribution functions in cylindrical slits with finite cross-section radii. The problem has been solved based on the asymptotic principle of interbody interactions within the framework of dispersion forces. Symmetric and asymmetric slits between two identical cylinders and between a cylinder and a planar infinite solid surface have been considered. Calculations have been performed for a symmetric slit with a width equal to two cylinder radii.
      PubDate: 2014-11-01
  • The effect of modifier concentration on the stability of emulsions and
           foams stabilized with colloidal silica particles
    • Abstract: Abstract The stability of emulsions and foams stabilized with hexylamine-modified silica particles has been studied as depending on the concentration of the surfactant. Silica modification with short-chain hexylamine leads to a marked increase in the contact angle upon selective wetting and inversion of the phases in the emulsions. The contact angles upon wetting silica surface by aqueous phases are no larger than 60°, while the maximum stability of foams corresponds to contact angles of 38°–50° depending on the concentration of the solid particles.
      PubDate: 2014-11-01
  • A capsule with a fractal shell in a uniform liquid flow
    • Abstract: Abstract The problem of a liquid flow, which is uniform at infinity, around a capsule comprising a fractal shell filled with a liquid identical to the ambient liquid has been solved. The flow in the fractal layer is described by the Brinkman equation, assuming that the viscosity of the effective medium differs from the viscosity of the pure liquid. Velocity and pressure distributions have been found, and the viscous drag force applied to the capsule has been calculated.
      PubDate: 2014-11-01
  • Effect of solvent surface tension on the radius of hematite nanoparticles
    • Abstract: Abstract In this work, the hematite (Fe2O3) nanoparticles were synthesized by homogeneous precipitation in alcohol (tert-butanol)/water mixed solvents with varied surface tension. The surface tension of the solvent was decreased from 55.8 to 15.9 mN m−1 by the increasing of the alcohol content from 20 to 80 vol %. The size of the particles was determined by BET, XRD and TEM techniques. Based on XRD results, the crystalline phase of Fe2O3 in all samples was attributed to the cubic hematite structure. The results show that the average particle size of the prepared hematite samples is decreased from 38 to 14 nm upon decreasing surface tension from 55.8 to 15.9 mN m−1.
      PubDate: 2014-11-01
  • The interference of fluctuations in the kinetics of metastable state decay
    • Abstract: Abstract The interference of nucleation-rate fluctuations during metastable state decay has been considered. The effects have been shown to be always weak; therefore, averaged parameters may be used to construct the kinetics of the process.
      PubDate: 2014-11-01
  • Zinc phthalocyanine-based water-soluble thiolated photosensitizer and its
           conjugates with gold nanoparticles: Synthesis and spectral properties
    • Abstract: Abstract A new photosensitizer, monoconjugate of zinc octa-4,5-carboxy-phthalocyanine with L-cysteine, which is rather readily soluble in water, has been synthesized and characterized. The chemisorption of its molecules on the surface of gold nanoparticles with different sizes has been studied. A comparative analysis of the spectral characteristics of the synthesized conjugates of gold nanoparticles with the photosensitizer has shown that the photosensitizer grafted to gold nanoparticles exhibits rather intense fluorescence. Therefore, such conjugates can be used for photodynamic therapy of tumors.
      PubDate: 2014-09-01
  • Ion-isotopic exchange reaction kinetics using organic base anion exchange
           resins Indion-102 and Indion GS-400
    • Abstract: Abstract The present study deals with the kinetic study of iodide and bromide ion-isotopic exchange reactions in organic based anion exchange resins Indion-102 (nuclear grade) and Indion GS-400 (non-nuclear grade) using radiotracer isotopes. The resins in iodide and bromide form were equilibrated respectively with iodide and bromide ion solutions which were previously spiked with 131I and 82Br radiotracer isotopes. For both bromide and iodide ion-isotopic exchange reactions, it was observed that the values of specific reaction rate increase with increase in ion concentration from 0.001 to 0.004 M at a constant temperature of 40.0°C. However, at constant ion concentration of 0.003 M, the specific reaction rate was observed to decrease with rise in temperature from 30.0 to 45.0°C. Also it was observed that for iodide ion-isotopic exchange reaction by using Indion-102 resin, the values of specific reaction rate, amount of iodide ion exchanged, initial rate of iodide ion exchange and logK d were 0.258 min−1, 0.492 mmol, 0.127 mmol/min and 19.2, respectively, which were higher than 0.208 min−1, 0.416 mmol, 0.087 mmol/min and 17.6, respectively, obtained by using Indion GS-400 resin under identical experimental conditions of 40.0°C, 1.000 g of ion exchange resin and 0.003M labeled iodide ion solution. The same trend was observed for the two resins during bromide ion-isotopic exchange reaction. The overall results indicate that, under identical experimental conditions, Indion-102 resin shows higher performance than Indion GS-400 resin.
      PubDate: 2014-09-01
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