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PHYSICS (623 journals)                  1 2 3 4 5 6 7 | Last

Acoustical Physics     Hybrid Journal   (8 followers)
Acoustics Today     Hybrid Journal   (2 followers)
Acta Acustica united with Acustica     Full-text available via subscription   (7 followers)
Acta Mechanica     Hybrid Journal   (15 followers)
Acta Mechanica Sinica     Hybrid Journal   (4 followers)
Acta Physica Slovaca     Open Access   (3 followers)
Advanced Composite Materials     Hybrid Journal   (10 followers)
Advanced Electromagnetics     Open Access   (9 followers)
Advanced Functional Materials     Hybrid Journal   (29 followers)
Advanced Materials     Hybrid Journal   (199 followers)
Advances in Acoustics and Vibration     Open Access   (16 followers)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (4 followers)
Advances in Condensed Matter Physics     Open Access   (6 followers)
Advances in Exploration Geophysics     Full-text available via subscription   (3 followers)
Advances in Geophysics     Full-text available via subscription   (4 followers)
Advances in High Energy Physics     Open Access   (12 followers)
Advances in Imaging and Electron Physics     Full-text available via subscription   (1 follower)
Advances in Materials Physics and Chemistry     Open Access   (7 followers)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (13 followers)
Advances in Nonlinear Optics     Open Access   (2 followers)
Advances in OptoElectronics     Open Access   (2 followers)
Advances In Physics     Hybrid Journal   (6 followers)
Advances in Physics Theories and Applications     Open Access   (4 followers)
Advances in Remote Sensing     Open Access   (6 followers)
Advances in Synchrotron Radiation     Hybrid Journal   (1 follower)
AIP Advances     Open Access   (4 followers)
American Journal of Applied Sciences     Open Access   (27 followers)
American Journal of Condensed Matter Physics     Open Access   (2 followers)
Analysis and Mathematical Physics     Hybrid Journal   (2 followers)
Annalen der Physik     Hybrid Journal   (2 followers)
Annales Geophysicae (ANGEO)     Open Access   (3 followers)
Annales Henri PoincarĂ©     Hybrid Journal   (2 followers)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (2 followers)
Annals of Physics     Hybrid Journal   (2 followers)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (1 follower)
Annual Review of Analytical Chemistry     Full-text available via subscription   (8 followers)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (1 follower)
Annual Review of Fluid Mechanics     Full-text available via subscription   (11 followers)
Annual Review of Materials Research     Full-text available via subscription   (4 followers)
Annual Review of Nuclear and Particle Science     Full-text available via subscription   (1 follower)
APL : Organic Electronics and Photonics     Hybrid Journal   (1 follower)
APL Materials     Open Access   (1 follower)
Applied Acoustics     Hybrid Journal   (3 followers)
Applied Composite Materials     Hybrid Journal   (8 followers)
Applied Mathematics and Mechanics     Hybrid Journal   (2 followers)
Applied Physics A     Hybrid Journal   (9 followers)
Applied Physics Frontier     Open Access  
Applied Physics Letters     Hybrid Journal   (22 followers)
Applied Physics Research     Open Access   (5 followers)
Applied Physics Reviews     Hybrid Journal   (7 followers)
Applied Radiation and Isotopes     Hybrid Journal   (5 followers)
Applied Remote Sensing Journal     Open Access   (5 followers)
Applied Spectroscopy     Full-text available via subscription   (11 followers)
Applied Spectroscopy Reviews     Hybrid Journal   (2 followers)
Applied Thermal Engineering     Hybrid Journal   (4 followers)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (3 followers)
Astronomy & Geophysics     Hybrid Journal   (1 follower)
Astrophysical Journal Letters     Full-text available via subscription   (2 followers)
Astrophysical Journal Supplement Series     Full-text available via subscription   (2 followers)
Atmospheric and Oceanic Optics     Hybrid Journal  
Atomic Data and Nuclear Data Tables     Hybrid Journal  
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (4 followers)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (5 followers)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (1 follower)
Biomaterials     Hybrid Journal   (22 followers)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (14 followers)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (11 followers)
Biomedical Imaging and Intervention Journal     Open Access   (4 followers)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (3 followers)
BMC Biophysics     Open Access   (7 followers)
BMC Nuclear Medicine     Open Access   (4 followers)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (5 followers)
Building Acoustics     Full-text available via subscription   (1 follower)
Bulletin of Materials Science     Open Access   (34 followers)
Bulletin of the Atomic Scientists     Full-text available via subscription   (3 followers)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (2 followers)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal   (1 follower)
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (2 followers)
Cells     Open Access  
Central European Journal of Physics     Hybrid Journal   (2 followers)
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription  
Chinese Journal of Chemical Physics     Hybrid Journal   (1 follower)
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   (1 follower)
Colloid Journal     Hybrid Journal   (1 follower)
Communications in Mathematical Physics     Hybrid Journal   (3 followers)
Communications in Numerical Methods in Engineering     Hybrid Journal   (4 followers)
Communications in Theoretical Physics     Full-text available via subscription   (2 followers)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (23 followers)
Composites Part B : Engineering     Hybrid Journal   (21 followers)
Computational Materials Science     Hybrid Journal   (15 followers)

        1 2 3 4 5 6 7 | Last

Colloid Journal    [3 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  [2187 journals]   [SJR: 0.207]   [H-I: 18]
  • Langevin-dynamics simulation of flocculation in water-in-oil emulsions
    • Abstract: Aggregation of internal phase droplets in water-in-oil emulsions has been simulated by the Langevin-dynamics method. At initial stages, the process rate obeys the Smoluchowski equations. The concentration ranges have been determined in which percolation clusters are formed. It has been shown that the examined emulsions may be divided into three groups, which enable one to predict their sedimentation stability. Percolation clusters are not formed in emulsions with internal-phase fractions of ≤0.1; therefore, their sedimentation rate is high. In the range of internal-phase fractions from 0.1 to 0.3–0.4, the percolation clusters are formed within a few fractions of a second; however, the rate of subsequent droplet addition to the clusters is low. The flocculation of internal-phase droplets results in the formation of a weak network structure followed by its densification and the separation of a dispersion medium with time. In emulsions with internalphase fractions of >0.3–0.4, almost all droplets unite into percolation clusters within a few fractions of a second. This structure is slowly densified; therefore, the rate of dispersion medium separation is low. The results obtained have been confirmed by experimental data on the sedimentation stability of the water-in-oil emulsions.
      PubDate: 2013-11-01
  • Nonstationary processes in an ion-exchange
           membranes-diaphragm-ion-exchange resin system. 1. Concentration
    • Abstract: Potential drop distribution in a system comprising ion-exchange membranes, a diaphragm, and an ion-exchange resin layer has been experimentally studied and theoretically analyzed. It has been established that the potential drop is redistributed in the system due to not only different electrical resistances of its elements, but also their concentration polarization, which depends on both the voltage applied to electrodes and relative positions of the system elements.
      PubDate: 2013-11-01
  • Special features of filtration of heavy particles with fine-fiber
    • Abstract: The excitation of elastic vibrations of fibers upon inertial deposition of submicron aerosol particles in the course of gas filtration through fine-fiber filters has been considered. Equations describing the dynamics of the interaction of several aerosol particles with a fiber have been derived. It has been shown that, in the case of heavy particles and long fibers, particles that have been previously deposited onto the fibers can be knocked-out upon an impact of a fast particle. Moreover, it has been demonstrated that fast particles can penetrate through traps consisting of several fibers due to the deformation of the latter. All these processes may have a substantial effect on the filtration performance in the inertial regime.
      PubDate: 2013-11-01
  • Diffusion deposition of aerosol nanoparticles in model granular filters
    • Abstract: The diffusion deposition of point aerosol particles from a flow in model granular (grained) filters, i.e., separate layers composed of parallel chains of spherical granules, has been studied at small Reynolds numbers. Numerical solution of the Stokes and convective diffusion equations has been employed to determine the drag forces and granule collection efficiencies as depending on the Peclet diffusion number in a range Pe = 0.02–2 × 104 and the ratio between the granule diameter and the distance between chain axes. Layers of closed chains with square and hexagonal packings have been considered. Approximation formulas have been derived for calculation of nanoparticle penetration in model granular filters.
      PubDate: 2013-11-01
  • The effect of poly(methacrylic acid) on electrosurface properties of
           titanium dioxide in aqueous suspensions
    • Abstract: The electrosurface properties and aggregation stability of aqueous titanium-dioxide suspensions are studied in wide ranges of medium pH values and poly(methacrylic acid) concentrations. Using the 2pK model, the ionization constants of surface hydroxyl groups of titanium dioxide are found and it is established that the adsorption of poly(methacrylic acid) macromolecules substantially decreases the fraction of neutral (uncharged) hydroxyl groups and affects the ratio between the positively and negatively charged surface hydroxyl groups.
      PubDate: 2013-11-01
  • Incorporation of quantum dots into a silica matrix using a compatible
    • Abstract: A method is developed for one-stage incorporation of cadmium-sulfide quantum dots synthesized in the presence of mercaptosuccinic acid into a silica matrix formed from a precursor containing ethylene-glycol residues—tetrakis(2-hydroxyethyl) orthosilica. This precursor has not previously been applied for this purpose. It is more compatible with diverse substances than tetraethoxysilane, which is traditionally used. Moreover, it is advantageous in its unlimited solubility in water; release of ethylene glycol, which does not precipitate quantum dots, rather than alcohol upon hydrolysis; and the feasibility of performing the sol-gel process at any pH value in a range of 2–10 without the addition of acid or alkali and without heating. When the precursor (50 wt %) is added to a dispersion of quantum dots, the system is transformed into a gel in as little as a few minutes. The synthesized hybrid materials are optically transparent. Therewith, the quantum dots incorporated into the silica matrix exhibit luminescence, with their spectral characteristics remaining almost unchanged.
      PubDate: 2013-11-01
  • Helium diffusion along wetted grain boundaries in sodium chloride
    • Abstract: An isobaric method has been developed for measuring helium diffusion flux, and the diffusion permeability has been determined for sodium chloride polycrystals containing aqueous interlayers located at grain boundaries. The average interlayer thickness (about 130 nm) has been calculated from the measurement results.
      PubDate: 2013-11-01
  • Photo-responsive microspheres prepared using hydrophobically modified
           poly(vinyl alcohol)-coumarin conjugate
    • Abstract: Photo-responsive microspheres were prepared by dispersing hydrophobically modified poly(vinyl alcohol)-epoxypropoxy coumarin conjugates (HmPVA-EPC) in an aqueous phase. These conjugates were prepared by subsequent covalent attachment of decanoyl chloride (DC) to PVA, and then EPC to HmPVA. The air/water interfacial activities of HmPVA-EPC were higher than unmodified PVA, due to the hydrophobicity of DC moiety. Under a cyclic irradiation by 365 and 254 nm light, the degree of photo-dimerization of EPC residues of HmPVA-EPC was as high as that of free EPC. The obtained HmPVA and HmPVA-EPC were immobilized into submicron-sized microspheres. The degree of Nile Red release from HmPVA-EPC microspheres was more than 75% within 24 h that was higher than the value of 40% for HmPVA microspheres. This difference is most likely due to the less compact packing of HmPVA-EPC in the microspheres due to the smaller number of hydrophobic DC residues. The dye release from HmPVA-EPC microspherses was inhibited by the irradiation with 365 nm light, possibly due to the photo-induced cross-linking of the polymer.
      PubDate: 2013-11-01
  • Adsorption and decomposition of diacylic peroxides on the surfaces of
           dispersed oxides
    • Abstract: The adsorption of oligo(sebacoyl peroxide) on Aerosil and MgO and benzoyl peroxide on Fe2O3, Cr2O3, and V2O5 has been studied. It has been established that peroxide adsorption on the considered adsorbents is described by the Langmuir equation. Benzoyl-peroxide adsorption increases in the series Fe2O3 < Cr2O3 < V2O5. The process of thermal decomposition of peroxides in the presence of the listed adsorbents has been studied. The overall reaction of peroxide decomposition comprises two components, i.e., the decomposition processes occurring in a solution and on an adsorbent surface. Kinetic and activation parameters of the thermal-decomposition reactions in the solutions and on the surfaces have been determined.
      PubDate: 2013-11-01
  • New two-dimensional polymer-metal composites based on highly ordered
           ensembles of nanoparticles. Design and optical properties
    • Abstract: A new method has been proposed for designing composite materials that represent highly ordered two-dimensional metal nanoparticles ensembles having variable geometric parameters and being embedded into the surface layer of a polymer matrix to a predetermined depth. The method is based on diblock copolymer micellar lithography and the effect of decreased glass-transition temperature of a polymer surface as compared with its bulk value. The possibility of independent variations in the depth of embedding of metal nanoparticles (by system annealing) and their size (by seeded growth) has resulted in the systematic study of the influence of the temperature and time of annealing on the kinetics of nanoparticle embedding into a polymer. For the first time, the plasmon-resonant properties of hexagonally ordered ensembles of gold nanoparticles located at a polymer-air interface have been experimentally studied. It has been established that the embedding of an ensemble of nanoparticles into a polymer is accompanied by a bathochromic shift of the maximum of its localized surface plasmon resonance due to a growth in the effective dielectric permittivity of the environment of the nanoparticles. An empirical equation has been proposed, which satisfactorily describes these experimental data.
      PubDate: 2013-11-01
  • Nonstationary processes in an ion-exchange
           membranes-diaphragm-ion-exchange resin system. 2. Electroosmosis
    • Abstract: Electroosmosis through a diaphragm and/or an ion-exchange resin layer has been experimentally studied at different relative positions thereof. The velocity of electroosmosis has been calculated with allowance for averaged field strengths found for the diaphragm and ion-exchange resin from the potential drop values measured for cell sections. It has been shown that the time dependences of electroosmosis velocity are related to nonstationary polarization processes proceeding in the system.
      PubDate: 2013-11-01
  • Cell model for hydromagnetic axial flow over a cylinder. Part I.
           transverse magnetic field
    • Abstract: Using cell model initiated by Happel, the filtration problem across a membrane composed of an aggregate of parallel circular cylinders subject to a uniform transverse magnetic field is studied. The system is simulated by a single cylinder enveloped by a concentric cylindrical enveloping surface with axial flow. The analysis leads to the evaluation of the permeability parameter. The results are then graphically presented and discussed. The effect of magnetic field is seen to increase the permeability.
      PubDate: 2013-11-01
  • Adsorption of a cationic surfactant, miramistin, from aqueous solutions on
           the surface of highly dispersed silica
    • Abstract: The adsorption of a universal antiseptic agent, the cationic surfactant miramistin, on the surface of highly dispersed silica has been studied. It has been shown that, when miramistin is adsorbed from acidic premicellar solutions, the main contribution to miramistin binding with the surface is made by hydrogen bonding between amide groups of surfactant molecules and silanol groups of silica, which is, at higher pH values, accompanied by ionic interaction between positively charged quaternary nitrogen atoms of miramistin and negatively charged dissociated silanol groups. In the case of adsorption from a micellar solution, an increase in the surface concentration of miramistin is almost independent of solution pH, because the second layer is predominantly formed due to hydrophobic interactions.
      PubDate: 2013-11-01
  • The influence of the concentration and size of silver nanoparticles on the
           conductivity of ring-shaped deposits resulting from evaporation of
           colloidal solution droplets
    • Abstract: The conductivity of ring-shaped deposits formed at the periphery of evaporating droplets of silver nanoparticle colloidal solutions has been studied. The dependence of the resistance of the ring-shaped deposits on nanoparticle size has been shown to exhibit a percolation transition. The specific conductivity of the deposits has been estimated in relation to their geometric shapes. The conductivity has been established to nonmonotonically depend on nanoparticle sizes. It has been noted that, in rather strong fields, the conductivity of the composite layers dramatically increases after some induction period. The X-ray spectra of silver have been revealed to alter for samples the conductivity of which has increased under the action of an external electric field.
      PubDate: 2013-11-01
  • Brownian diffusion of aerosol particles in slit-like channel with moving
           gas for uniform, point, and segment sources positioned at channel inlet
    • Abstract: Analytical solutions to the equations of Brownian diffusion were derived to depict the outlet distributions of local concentrations of particles penetrating through a slit-like channel for both the spatially uniform and non-uniform sources of particles at the channel inlet. The “point” and “segment” sources positioned at the inlet form the non-uniform entering concentrations. The sources could emit particles in either the single-pulse or pulse-periodic (steady-state) operating mode. The solutions were obtained for both the laminar gas stream with parabolic-velocity profile (the Poiseuille flow) and the stream with plane profile (the slug flow). The physical and mathematical features of the Brownian diffusion were considered with respect to the pulse and the pulse-periodic (steady-state) point and segment emissions of particles in the Poiseuille flow. The Monte Carlo simulation of the Brownian motion of particles was performed to compare the analytical and the simulated distributions of particles for the point source.
      PubDate: 2013-11-01
  • Electrophysical properties of latent tracks of heavy ions in polymers
    • Abstract: Poly(ethylene terephthalate) films irradiated by high-energy ions without additional etching have been studied. It has been shown that tracks of heavy high-energy ions in poly(ethylene terephthalate) may be considered to be single through capillaries suitable for studying electrophysical properties. It has been revealed that the surface electrical conductivities of electrolyte solutions (KCl, LiCl, MgCl2, and BaCl2) in the tracks of nonetched membranes are substantially higher, while the surface charges are noticeably lower, than those of etched membranes.
      PubDate: 2013-11-01
  • Adsorption of benzethonium chloride from aqueous solutions on dispersed
    • Abstract: The adsorption of benzethonium chloride from aqueous solutions on the surface of finely dispersed particles of aluminum oxide, titanium dioxide, and zirconium dioxide is investigated. The ratio of the amount of adsorbed benzethonium chloride molecules to the amount of surface hydroxyl groups as potential adsorption sites is proposed to be used for characterizing the structure of adsorption layers. It is shown that the formation of supramolecular structures of benzethonium chloride molecules on solid surfaces begins when its concentrations in suspensions is significantly lower than the critical micellization concentration. It is established that benzethonium chloride is adsorbed via simultaneous interaction of the surfactant molecules with the surface hydroxyl groups and hydrophobic interaction of their hydrocarbon tails; the amounts of molecules adsorbed as a result of these interactions depend on both benzethonium chloride concentration in a solution and the density of the hydroxyl groups on an oxide surface.
      PubDate: 2013-11-01
  • Dynamics of a network of hydrogen bonds upon water electrocrystallization
    • Abstract: Computer simulation is employed to study the dynamics of a network of hydrogen bonds and the structural properties of water placed between graphene layers. The presence of the graphene walls has been shown to substantially affect the water phase diagram. Glass transition processes are observed in the system, and liquid water completely passes to an amorphous state. Moreover, it has been established that the imposition of an external electric field with strength E ≥ 0.5 V/Å on the system subjected to increased pressure results in structural ordering of water. It has been found that water located between graphene layers is transformed into Ic cubic ice. The electrocrystallization of water has been shown to substantially change the dynamics of the network of hydrogen bonds.
      PubDate: 2013-11-01
  • Synthesis and surface activities of multi-ammonium cationics derived from
           n-octadecyl glycidyl
    • Abstract: In this study, cationic surfactants having two, three or four hydroxyl groups were synthesized by the condensation reaction of n-octadecyl glycidyl ether and amine (methyl amine and dimethyl amine) followed by the quaternization with dimethyl sulfate. The structure of a resulting product was determined by 1H NMR and FT-IR spectroscopies. Interfacial tensions measured as a function of time for n-decane drops brought into contact with 1 wt. % surfactant solutions at 25°C indicated that the interfacial tension decreased over a period of about 10–15 min to an equilibrium value. The results of contact angle measurements indicate that C18-BADM surfactant having four hydroxyl groups is the best wetting agent among others studied. Moreover, the excellent adsorption capacity of C18-BADM system suggests that it can be used as a softening agent during a laundry process. The results of foam stability measurement were consistent with those of CMC and contact angle. The percentage of foam volume decrease was found to increase with the hydrophilicity of a surfactant.
      PubDate: 2013-09-01
  • The study of the possibility of gold hydrosol stabilization with
           nonthiolated homooligonucleotides with different lengths and sequences
    • Abstract: The stabilization of citrate gold hydrosols with nonthiolated oligonucleotides having different lengths and sequences has been studied, with the oligonucleotides being added both at the stage of hydrosol synthesis (at 37 and 60°C) and after it. The oligonucleotides have been found to exhibit a pronounced stabilizing effect irrespective of the moment of their addition to the hydrosols. The only exception is the situation, in which adenine-based oligonucleotides are heated to 60°C in the course of the synthesis, when they, on the contrary, destabilize the hydrosols. Short-chain oligonucleotides (hexamers) exhibit a stronger stabilization effect than dodecamers do. Moreover, it has been shown that adenine-based and cytosine-based oligonucleotides show the strongest stabilizing effect.
      PubDate: 2013-09-01
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