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  Subjects -> PHYSICS (Total: 767 journals)
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PHYSICS (557 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: 16)
Advanced Functional Materials     Hybrid Journal   (Followers: 38)
Advanced Materials     Hybrid Journal   (Followers: 400)
Advances in Condensed Matter Physics     Open Access   (Followers: 8)
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: 3)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 16)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 14)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 9)
Advances in Physics Theories and Applications     Open Access   (Followers: 8)
Advances in Remote Sensing     Open Access   (Followers: 8)
Advances in Synchrotron Radiation     Hybrid Journal   (Followers: 1)
AIP Advances     Open Access   (Followers: 6)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 31)
American Journal of Condensed Matter Physics     Open Access   (Followers: 5)
American Journal of Signal Processing     Open Access   (Followers: 8)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 2)
Annalen der Physik     Hybrid Journal   (Followers: 3)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 4)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 1)
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: 6)
Applied Composite Materials     Hybrid Journal   (Followers: 9)
Applied Physics     Open Access  
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 26)
Applied Physics Research     Open Access   (Followers: 6)
Applied Physics Reviews     Hybrid Journal   (Followers: 8)
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)
ASTRA Proceedings     Open Access  
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: 7)
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: 34)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 14)
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: 53)
Composites Part B : Engineering     Hybrid Journal   (Followers: 72)
Computational Astrophysics and Cosmology     Open Access  
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: 12)
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: 17)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)

        1 2 3 4 5 6 | Last

Journal Cover   Colloid Journal
  [SJR: 0.207]   [H-I: 18]   [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  [2300 journals]
  • On determination of the fluctuation sensitivity limit of the induction
           method for the measurement of surface roughness
    • Abstract: Abstract The fluctuation sensitivity limit of the induction method for the measurement of surface roughness has been determined. It has been shown that, for a profilograph used in this work, the minimum value of magnetic induction resulting from current thermal fluctuations is equal to 3 × 10−7 G. According to the experimental data, a change in the surface relief height by 2 nm varies the magnetic induction by 2 × 10−6 G, i.e., by a value exceeding the value determined for the thermal fluctuations by an order of magnitude. Hence, the design of the differential inductive sensor proposed for the profilograph can be used to measure the surface roughness on the order of several fractions of a nanometer.
      PubDate: 2015-01-01
       
  • Some colloidochemical properties of molybdenum blues synthesized using
           glucose as a reducing agent
    • Abstract: Abstract Samples of molybdenum blues are synthesized using glucose as a reducing agent. The effect of synthesis conditions on the characteristics of particles is studied. It is established that, irrespective of the synthesis temperature and the order of reagent mixing, the dispersed phase consists of ring-shaped particles the sizes of which are no larger than 5 nm. The resulting disperse systems are stable in a pH range of 0.8–3.0. It is shown that, in this pH range, the ζ-potential of the particles is negative, while, at pH below 0.7, it is positive.
      PubDate: 2015-01-01
       
  • Deposition of nanoparticles in model multilayer fibrous filters with
           three-dimensional structure
    • Abstract: Abstract The diffusion deposition of aerosol nanoparticles has been studied at small Reynolds numbers in a model filter with a three-dimensional structure formed from two hexagonal networks of parallel fibers rotated relative to each other by the right angle and located normal to the flow direction. Efficiencies of particle collection by fibers have been calculated as depending on the number of rows of fibers in a wide range of Peclet numbers. It has been shown that the effect of a diffusion wake after a fiber on the nanoparticle deposition in highly porous filters with the three-dimensional structure is less pronounced than that in filters with a two-dimensional structure. Moreover, at a packing density of three-dimensional filters below 0.05, the effect of the diffusion wake may be ignored. The double hexagonal model has been proposed to be used as an adequate model of real fibrous filters.
      PubDate: 2015-01-01
       
  • Kinetics of picoliter binary droplet evaporation on a substrate at reduced
           pressure
    • Abstract: Abstract The effects of different factors on the time of evaporation of a single picoliter droplet of a water-alcohol solution on a metal substrate with a high thermal conductivity have been studied in the free molecular regime. It has been experimentally shown that the evaporation of such droplets occurs in the pinning mode. The evaporation times have been measured for droplets of water-alcohol solutions of different concentrations on the substrate at a reduced pressure. The calculations performed in terms of a one-dimensional mathematical model have shown that the rates of evaporation of pico- and femtoliter droplets of water-alcohol solutions nonlinearly depend on alcohol concentration, initial droplet height, and substrate temperature.
      PubDate: 2015-01-01
       
  • An electro-optical study of electrophoresis of colloidal magnetite
           particles in kerosene in the field of near-electrode volume charge
    • Abstract: Abstract The features of the electro-optical phenomenon of variations in the transparency of weakly conducting kerosene-based magnetic colloids in the near-electrode region under the action of a pulsed electric field are studied. A model that takes into account the influence of the parameters of near-electrode volume charge on the electrophoretic motion of colloidal particles is formulated for the phenomenon. The calculated time dependences of the transparency appear to be in satisfactory agreement with experimental data.
      PubDate: 2015-01-01
       
  • Deposition of nanoparticles in model multilayer fibrous filters with a
           two-dimensional flow field
    • Abstract: Abstract The diffusion deposition of aerosol nanoparticles in model highly porous filters composed of equidistant rows of fibers, which are oriented normal to a flow and form ordered two-dimensional square and hexagonal structures, has been studied at low Reynolds numbers. Efficiencies η of particle collection on the fibers have been calculated as depending on number N of the rows of fibers in a wide range of Peclet numbers. It has been shown that the diffusion wake has a stronger effect for the model with the square structure, and a reduction in the average values of η with a rise in N, as compared with η for an isolated row, becomes more pronounced with an increase in the Peclet diffusion number.
      PubDate: 2015-01-01
       
  • Interfacial behavior of oil/oil and oil/water soluble binary surfactants
           and their effect on stability of highly concentrated W/O emulsions
    • Abstract: Abstract Instability of highly concentrated water-in-oil emulsions which contain a metastable inorganic salt solution in a form of drops arises from the crystallization of salt in the dispersed phase, both on the shelf and under high shear. In this work the interfacial properties of two binary mixtures of oil/oil soluble and oil/water soluble surfactants with different molar ratios were studied to determine their effect on the stability of manufactured emulsions. The two mixed surfactants used were mainly poly (isobutenyl) succinic anhydride (PIBSA)-based surfactant with either sorbitan monooleate (SMO) (oil/oil soluble) or with polyoxyethylene sorbitan monooleate (Tween 80) (oil/water soluble). Interfacial studies showed completely opposite behavior of these two mixtures with changing concentration of polymeric surfactant. A synergetic effect between PIBSA-Mea and Tween 80 molecules was evident. PIBSA/Tween 80 emulsions exhibited better shelf stability than the PIBSA-Mea/SMO mixtures due to the efficiently packed interfacial film produced by this synergetic binary surfactant mixture. In addition, a significant improvement in stability under high shear conditions was achieved with the oil/water soluble PIBSA/Tween 80 mixture. The results showed that the interfacial study are important for the understanding of instability due to crystallization in emulsions with an oversaturated dispersed phase
      PubDate: 2015-01-01
       
  • Cross-linked poly(methyl methacrylate) particles with surface amino groups
    • Abstract: Abstract Positively charged monodisperse particles have been synthesized via emulsifier-free emulsion copolymerization of methyl methacrylate with vinylformamide and ethylene glycol dimethacrylate. The effect of the cross-linking agent on the conversion of the monomers, as well as on the shape, size distribution, and surface characteristics of the obtained particles, has been determined. Addition of the cross-linking agent (5 wt %) to the reaction system has been shown to result in the formation of particles, which, after hydrolysis, have positive ζ potentials at pH 2–10.
      PubDate: 2015-01-01
       
  • Effect of stabilizer on the stability and shape of nonspherical
           polystyrene particles produced by seeded dispersion polymerization in the
           presence of saturated hydrocarbon droplets
    • Abstract: Abstract In this work, seeded dispersion polymerization (SDP) of 2-ethylhexyl methacrylate with polystyrene seed particles in the presence of droplets of various hydrocarbons was carried out. The effect of different stabilizers on the stability and shape of the obtained particles was investigated. The experimental results showed that SDP system is unstable without specific stabilizer that results in partial coagulation. In the presence of sodium dodecyl sulfate, the SDP system represents a partially stable dispersion. Almost fully stable dispersions were obtained using several stabilizers including poly(vinyl pyrrolidone), poly(vinyl alcohol), and hydroxypropyl methylcellulose. The results suggest that the type of hydrocarbon affects the stability of the investigated dispersions. Microscopic studies showed that chemistry of stabilizer can influence the shape of the particles, including those with asymmetric morphologies.
      PubDate: 2015-01-01
       
  • Electrokinetic potential and flocculation of bentonite suspensions in
           solutions of surfactants, polyelectrolytes and their mixtures
    • Abstract: Abstract The effects of cationic and anionic surfactants and polyelectrolytes, as well as their binary mixtures, on the electrokinetic potential and the degree of aggregation/sizes of particle flocs in bentonite suspensions have been studied. The amounts of the above reagents, compositions and ratios of positive and negative charges in the mixtures, charge densities of the polyelectrolytes, and the order of the introduction of the components into systems have been varied. It has been shown that the addition of cationic surfactants or polyelectrolytes and mixtures thereof causes a substantial reduction of the negative ζ-potentials of the particles and reversal of the sign of their charge. The addition of anionic surfactants or polyelectrolytes leads to a twofold increase in the ζ-potential as a result of adsorption of negatively charged surfactant ions/polymer segments on negatively charged clay particles via non-Coulomb forces. In the presence of mixtures of anionic and cationic polyelectrolytes, irrespective of their composition and the order of the introduction of the components into a suspension, the particles acquire a negative ζ-potential, which is characteristic of particles that adsorb an anionic polyelectrolyte alone. Synergistic flocculating action is observed for mixtures of weakly and moderately charged anionic and cationic polyelectrolytes. This effect takes place even for mixtures with a manifold excess of negatively charged segments relative to positively charged ones. The observed regularities have been explained by the structural peculiarities of mixed adsorption layers of polyelectrolytes, i.e., the coexistence of a thin layer of adsorbed cationic polymer chains characterized by a large number of contacts with the surface and an extended layer of an anionic polyelectrolyte (long loops and tails of macromolecules), in which the cationic polymer layer is “drowned.” The electrokinetic potential and the ability of the particles to aggregation (via the formation of polymer bridges) in mixed solutions of anionic and cationic polyelectrolytes are primarily determined by the adsorption value of the anionic polymer.
      PubDate: 2015-01-01
       
  • Computer simulation of CO 2 /CH 4 mixture adsorption in wet microporous
           carbons
    • Abstract: Abstract Adsorption of CH4, CO2 and their mixtures in dry and wet microporous carbons at 298 K is studied using grand canonical Monte Carlo computer simulations. Special attention is paid to the effects of water content and pore size on adsorption capacity and selectivity of the carbonaceous porous material. The presence of pre-adsorbed water may lead to non-monotonic dependence of adsorbed gas capacity on moisture content, which is observed for pure CO2 and CO2/CH4 mixtures at low adsorbate density (i.e., in wider pores, at low gas pressures, for low content of water). This effect is shown to be caused by electrostatic interactions of CO2 molecules with pre-adsorbed water. Under other conditions the presence of water in the pores leads to a decrease of the accessible volume causing a decrease of the adsorption capacity.
      PubDate: 2015-01-01
       
  • A study of cryostructuring of polymer systems. 37. Composite cryogels
           formed from dispersions of poly(butadiene- co -styrene) latex in aqueous
           poly(vinyl alcohol) solution
    • Abstract: Abstract Composite macroporous poly(vinyl alcohol) (PVA) cryogels have been prepared by cryogenic treatment (freezing at −20°C for 12 h followed by thawing at a rate of 0.03°C/min) of mixtures of an aqueous PVA solution and poly(butadiene-co-styrene) latex. The values of the elasticity modulus and fusion temperature have been determined for the obtained samples, and their microstructures have been studied by optical microscopy of thin sections. The rigidity and heat endurance of the filled cryogels have been shown to markedly increase with the fraction of the latex in the initial liquid disperse system. Moreover, it has been found that, beginning from some critical concentration of the latex in a mixture with the initial PVA solution, cryostructuring leads to the formation of two interpenetrating phases—a continuous phase of the hydrophilic PVA cryogel and a network of the hydrophobic phase that results from cryocoagulation of non-frost-resistant poly(butadiene-co-styrene) latex. The morphological features of this phase have been studied, and the sizes of macropores and the thicknesses of their walls have been determined with the help of scanning electron microscopy.
      PubDate: 2015-01-01
       
  • Application of contact angle analysis and surface-assisted laser
           desorption/ionization mass spectrometry to studying the surface state of
           AMg-6 and Ad-0 aluminum alloys
    • Abstract: Abstract Surface- and matrix-assisted laser desorption/ionization mass spectrometry and analysis of contact angles have been employed to examine the surfaces of structural materials (Ad-0 and AMg-6 aluminum alloys). The combination of methods used has been shown to enable one to compare the degrees of nonuniformity of different surfaces and determine the effect of the chemical composition of surface impurities on surface properties. Owing to the high sensitivity and informativity, the proposed combination of the methods can be used to determine the nonuniformity of surfaces subjected to the action of rocket fuel components.
      PubDate: 2015-01-01
       
  • Droplet temperature distribution in the course of condensation relaxation
           of supersaturated vapor
    • Abstract: Abstract A modified kinetic equation that takes into account distributions of droplets over sizes and temperatures has been presented. The problem has been formulated and a mathematical model has been developed for condensation relaxation with regard to droplet temperature distribution. The results of numerical solution of the formulated problem have been presented for two vapor-gas mixtures. Comparative analysis of the data obtained with and without allowance for the droplet temperature distribution has made it possible to determine the reliability of previous results.
      PubDate: 2015-01-01
       
  • Electroconvective structures formed in a magnetic colloid layer
    • Abstract: Abstract The formation of cellular and labyrinth-like electroconvective structures in a thin layer of a magnetic colloid under the effect of a constant electric field has been studied. The time of structure formation has been measured, and it has been shown that this time declines with increasing electric field strength and electric conductivity of a medium. A constant magnetic field that is codirectional with the electric field has been established to shorten the time of the formation of electroconvective structures and the critical electric field strength at which structures arise.
      PubDate: 2015-01-01
       
  • The size, charge, and electrokinetic potential of gold nanoparticles in
           solutions of sodium bis(2-ethylhexyl) sulfosuccinate in n
           -decane-chloroform mixtures
    • Abstract: Abstract The hydrodynamic diameters and electrokinetic potentials of gold nanoparticles in n-decane, chloroform, and mixtures thereof have been studied as functions of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) concentration. At AOT concentrations in n-decane below 2 mM, gold nanoparticles are covered with AOT monolayer and do not reveal electrophoretic mobility. At a concentration of 0.3 M that, according to the data of photon-correlation spectroscopy, corresponds to the onset of adsorption of AOT micelles on the nanoparticle surface, the ζ-potential reaches a maximum value of 190 mV; then, it decreases with increasing surfactant concentration. A rise in the volume fraction of chloroform in decane-chloroform mixtures drastically increases the ζ-potential even at low AOT concentrations. The obtained results have been analyzed in terms of the Debye-Hückel theory.
      PubDate: 2015-01-01
       
  • Interaction between cationic monomer and sodium dodecyl sulfate in
           concentrated aqueous solutions: EPR spectroscopy and rotational viscometry
           
    • Abstract: Abstract The interaction of a cationic monomer, trimethyl[methacryloxyethyl]ammonium methyl sulfate, with sodium dodecyl sulfate (SDS) has been studied in relatively concentrated solutions containing SDS (70–500 mM) and the monomer (from 7 mM to 2.5 M). The high concentrations of the components do not prevent the monomer from bonding to oppositely charged SDSs, which confirms the possibility in principle to polymerize ionic monomers through a template mechanism using micelles of oppositely charged surfactants as templates. The range of component ratios 0.5 ≤ [monomer]/[SDS] ≤ 2 is most promising for realization of the template mechanism of polymerization. The effect of SDS on the macroscopic and microscopic properties of the system significantly and to a maximum extent decreases upon a further rise in the relative concentration of the monomer.
      PubDate: 2015-01-01
       
  • Adsorption and photocatalytic oxidation of acetone and diethyl sulfide on
           FeOOH aerosol
    • Abstract: Abstract Superfine FeOOH powder in an aerosol state with a particle size of about 3 nm has been studied in the processes of reactive adsorption and photocatalytic oxidation of acetone and diethyl sulfide vapors in air. The aerosol (5 g) is sprayed with a Helmholtz resonator placed into the center of a 100-L plastic chamber. Spraying is completed in 2 min, and the aerosol settles down within a time of less than 5 min. Rapid partial adsorption of acetone and diethyl sulfide on aerosol nanoparticles with characteristic times of 1 and 1.3 min, respectively, has been observed. FeOOH exhibits no photocatalytic activity with respect to acetone oxidation. Diethyl sulfide is oxidized with the formation of acetaldehyde as an intermediate product and CO and CO2 as the final products.
      PubDate: 2015-01-01
       
  • 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
       
 
 
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