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  Subjects -> PHYSICS (Total: 736 journals)
    - ELECTRICITY AND MAGNETISM (7 journals)
    - MECHANICS (18 journals)
    - NUCLEAR PHYSICS (44 journals)
    - OPTICS (84 journals)
    - PHYSICS (537 journals)
    - SOUND (17 journals)
    - THERMODYNAMICS (29 journals)

PHYSICS (537 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)
Acta Physica Slovaca     Open Access   (Followers: 3)
Advanced Composite Materials     Hybrid Journal   (Followers: 10)
Advanced Functional Materials     Hybrid Journal   (Followers: 31)
Advanced Materials     Hybrid Journal   (Followers: 281)
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: 11)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 13)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 7)
Advances in Synchrotron Radiation     Hybrid Journal   (Followers: 1)
AIP Advances     Open Access   (Followers: 4)
AIP Conference Proceedings     Full-text available via subscription  
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Condensed Matter Physics     Open Access   (Followers: 2)
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)
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: 2)
Applied Composite Materials     Hybrid Journal   (Followers: 8)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 23)
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: 8)
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: 2)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 2)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 4)
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: 25)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 14)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 11)
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: 35)
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  
Central European Journal of Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription  
Chinese Journal of Chemical Physics     Hybrid Journal   (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: 1)
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: 26)
Composites Part B : Engineering     Hybrid Journal   (Followers: 24)
Computational Materials Science     Hybrid Journal   (Followers: 15)
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: 9)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 2)
COSPAR Colloquia Series     Full-text available via subscription  
Cryogenics     Hybrid Journal   (Followers: 11)
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  [2209 journals]   [SJR: 0.207]   [H-I: 18]
  • Concentration factor and rheology of aqueous titanium dioxide dispersions
    • Abstract: Abstract The rheological properties of aqueous titanium dioxide dispersions have been studied by rotational viscometry. It has been established that the studied disperse systems are highly structured, and their degree of structuring dramatically increases with the volume fraction φ of the solid phase. At solid phase contents φ ≥ 0.164, the breakage of the disperse structure is accompanied by the appearance of local discontinuities and an abnormal dependence of viscosity on shear stress. The results obtained have been analyzed in terms of the Uriev theory of aggregated systems. The radii of aggregates and maximum solid phase content φm that corresponds to the formation of a continuous disperse structure under the conditions of dynamic impact have been calculated.
      PubDate: 2014-07-01
       
  • Aggregation stability of a positively charged γ-Al       class="a-plus-plus">2O       class="a-plus-plus">3 sol prepared from an
           air-dry nanopowder
    • Abstract: Abstract Photometric data on the aggregation stability of Al2O3 hydrosols prepared from Aeroxide Alu C nanopowder in NaCl solutions at pH 4.5 and 5.5 have been discussed within the framework of the generalized Derjaguin-Landau-Verwey-Overbeek theory. Analysis of the pair interaction potentials in an ensemble of particles of a sol primordially containing both primary nanoparticles and their aggregates has led to the conclusion that the coagulation proceeds via the barrierless mechanism in the secondary potential minimum.
      PubDate: 2014-07-01
       
  • Rheological properties of road bitumens modified with polymer and solid
           nanosized additives
    • Abstract: Abstract The study of the viscoelastic properties of composites based on road bitumens have shown that the addition of polymeric modifiers (poly(bytadiene-block-styrene) or devulcanized rubber particles) substantially increases the storage and loss moduli and decreases the intensity of reduction in the storage modulus with temperature by several orders of magnitude. However, at high polymer content, growth inadmissible from the point of view of acceptable technological parameters is observed in the apparent viscosity. The introduction of carbon nanotubes into bitumen does not substantially affect its viscoelastic properties. Filling with meta-kaolin promotes an increase in the storage modulus at elevated temperatures. It has been shown that a direct correlation may be established between the objective characteristics of bitumen-based composites and standard specification parameters, such as penetration depth and heat resistance.
      PubDate: 2014-07-01
       
  • The formation of mono- and bimetallic silver-containing seed nanoparticles
    • Abstract: Abstract The regularities of the formation of mono- and bimetallic seed particles used for subsequent synthesis of anisotropic silver nanoparticles in micellar media has been studied. It has been found that the formation of nanosized silver seed particles is influenced by the synthesis parameters, such as the presence of oxygen and gold in the reaction system. Based on characteristics of the surface plasmon resonance band of nanoparticles, a simple and efficient method has been proposed for controlling the degree of monodispersity of the seed particles.
      PubDate: 2014-07-01
       
  • Water vapor clustering in the field of a chlorine anion occurring in a
           planar nanopore with structureless walls
    • Abstract: Abstract The Monte Carlo bicanonical statistical ensemble method has been employed to calculate the free energy, entropy, and work of Cl− ion hydration in model planar pores 0.5 and 0.7 nm wide at 298 and 400 K. A detailed model of many-body interactions with the ion has been used, the model being matched to experimental data with respect to the free energy and enthalpy of attachment reaction in water vapor. Under the conditions of a restricted volume, the equilibrium size of a hydration shell substantially decreases, with the effect becoming stronger in the range of moderate and large sizes. In moderately supersaturated vapors, under the conditions of a nanopore, the ion loses its hydration shell as the temperature is decreased. In supersaturated vapors, the hydration shell formed on the ion is thermodynamically stable, while the stability crisis shifts to the region of larger sizes. The enhancement of the thermodynamic stability in the pore results from a rise in the chemical potential of molecules due to the deficiency of closet neighbors and a reduction in the entropy under the conditions of the restricted volume. As the temperature is elevated, the effect of ion displacement out of its hydration shell is leveled. The regularities derived in terms of the estimation model based on the capillary approximation are in qualitative agreement with the results of computer simulation.
      PubDate: 2014-07-01
       
  • Formation kinetics of nanoparticles as the basis for simulating the
           generation mechanism of Liesegang rings in gels
    • Abstract: Abstract An approach has been proposed for determining the space-time parameters of the formation process of Liesegang rings. This approach relates the processes of the formation of nanoparticles and dense periodic precipitates from them. Dynamic light scattering is employed to reveal periodic variations in the intensity of light scattered by nanoparticles with different sizes, from which Liesegang rings are formed. A relationship between the periods of the variations in the intensity of light scattered by nanoparticles (microscopic process) and the times of the formation of Liesegang rings as a whole (macroscopic process) has been found.
      PubDate: 2014-07-01
       
  • Physicochemical and electrorheological properties of titanium dioxide
           modified with metal oxides
    • Abstract: Abstract The properties of electrorheological fluids containing dispersed phase of titanium dioxide nanoparticles prepared via the sol-gel method and modified with metal oxides have been studied. Titanium dioxide has the anatase structure with crystallite sizes of 8–10 nm and a specific surface area of 90–140 m2/g. It has been found that the magnitude of the electrorheological response of the filler is determined by the specific surface area and the content of a modifying component. The strongest electrorheological response has been revealed for titanium dioxide modified with aluminum oxide at an Al content of 6.5–7.0 mol % relative to TiO2.
      PubDate: 2014-07-01
       
  • On local entropy production in gases and gaseous mixtures flowing though
           nanosized channels
    • Abstract: Abstract The problem of local entropy production in gases flowing through nanosized channels has been discussed. The main attention has been focused on the role of adsorbed layers. It has been shown that the local entropy production differs from that obtained in terms of the classical approach. For example, the transfer in the adsorbed layer influences both the entropy production and the form of phenomenological equations. An additional difference results from the mass and energy exchange between the bulk phase and the adsorbed layer, this exchange being related to nonlinear adsorption isotherms. This exchange is described by independent local phenomenological equations.
      PubDate: 2014-07-01
       
  • Study of protein coatings cross-linked via the free-radical mechanism on
           magnetic nanoparticles by the method of spectral and fluorescent probes
    • Abstract: Abstract Magnetite nanoparticles have been obtained with stable coatings formed from bovine and human serum albumins. The coatings are fixed by free-radical cross-linking of the proteins with the use of their ability to form interchain covalent bonds under the action of free radicals, which are generated with participation of transition metals present on nanoparticle surface. The method of spectral and fluorescent probes has been employed for the first time to describe the properties of coatings with the use of various dyes. It has been shown that, when studying the adsorption and free-radical cross-linking of proteins on nanoparticles, it is reasonable to use polymethine and squarylium dyes for estimating the functional properties of the proteins forming the coatings. It has been found that as many as 50% of molecules forming an albumin coating crosslinked via the free-radical mechanism retain their capability of bonding to a fluorescent dye. It has been concluded that the proteins occurring in the structure of the coatings retain their functional properties.
      PubDate: 2014-07-01
       
  • A model of a dust-loaded filter with asymmetric deposit of particles on
           fibers
    • Abstract: Abstract Results of numerical simulation have been reported for the flow field and diffusion deposition of nanoparticles in a model dust-loaded fibrous filter, i.e., a row of parallel fibers coated with porous permeable shells shifted toward an incident flow. The flow field and point particle collection efficiency on fibers coated with the shells have been calculated by combining the Stokes, Brinkman, and convective diffusion equations. It has been shown that the pressure drops and efficiencies of nanoparticle deposition in the filters composed by fibers with coaxial and asymmetric porous shells are almost identical.
      PubDate: 2014-07-01
       
  • Hydrophobicity of talc basal surface
    • Abstract: Abstract The hydrophobicity of the talc basal surface is considered in the framework of the concept which relates the properties of layered silicates and their dispersions to the differences between the characteristics of the basal and side surfaces of their particles. The ab initio calculations of the energetics and geometry of the microclusters formed by water molecules adsorbed on the active sites (oxygen ions) located at the perfect basal surface of talc are performed. It is shown that the typical property of the hydrophobic surface is the adsorption of single molecules of water on extremely scarce or weak active sites of the surface, which act as secondary adsorption sites, and subsequent adsorption of water molecules on these secondary sites which results in the formation of ring-like structures. The heat of adsorption on this surface is shown to be essentially lower than the water condensation heat, which is also indicative of the hydrophobicity of the basal surface of talc.
      PubDate: 2014-07-01
       
  • Influence of sodium polystyrene sulfonate on dynamic surface properties of
           bovine serum albumin solutions
    • Abstract: Abstract Dynamic surface elasticity of solutions of bovine serum albumin (BSA)/sodium polystyrene sulfonate (PSS) complexes has been measured as depending on the age of a surface, polyelectrolyte concentration, and solution pH by the oscillating-ring method. At pH values below the isoelectric point of BSA, the rate of variations in the surface properties increases due to a decrease in the electrostatic adsorption barrier as a result of a reduction in the total charge of the protein/polyelectrolyte complex. Therewith, a local maximum arises in the kinetic dependences of the surface elasticity, this maximum indicating the onset of the breakage of the tertiary structure of the protein in the surface layer. In the pH range corresponding to like charges of the protein and polyelectrolyte, variations in the surface properties slow down. In this case, the BSA/PSS complex is also formed via the interaction of PSS with those domains of globule surface that carry a charge opposite to the total charge of a protein molecule. A higher negative charge of the complex than that of protein globules increases the electrostatic adsorption barrier and decelerates variations in the surface properties. At the same time, the dependences of the surface elasticity on the surface pressure coincide with the dependences for the protein solution. Hence, the polyelectrolyte-protein interaction affects only the adsorption kinetics, while the surface properties in the vicinity of equilibrium are governed by adsorbed protein globules.
      PubDate: 2014-07-01
       
  • The size effect in the catalytic activity of Ag       class="a-plus-plus">corePt       class="a-plus-plus">shell nanoparticles
    • Abstract: Abstract It has been shown that, in the presence of 6.3-nm silver nanoparticles, platinum is reduced in a K2PtCl4-containing aqueous solution after it is saturated with hydrogen. The process yields bimetallic AgcorePtshell “core/shell” nanoparticles. Nanoparticles have been synthesized with different silver-to-platinum molar ratios from 9: 1 to 1: 9. Optical spectroscopy, electron microscopy, and electron diffraction data have confirmed the formation of the core/shell nanoparticles. Bimetallic AgcorePtshell nanoparticles exhibit the ability to catalyze the reduction of methyl viologen with hydrogen in an alkaline aqueous solution, which is typical of platinum nanoparticles. The existence of a “critical” thickness of the platinum shell below which the catalytic reduction of methyl viologen does not take place has been established. The critical thickness is about 1 nm, which corresponds to approximately two atomic platinum layers on a silver core.
      PubDate: 2014-07-01
       
  • Inhibitive effect of potassium methylsiliconate on hydration swelling of
           montmorillonite
    • Abstract: Abstract Herein we report on a study on the inhibition effect of potassium methylsiliconate on hydration swelling of montmorillonite. The results of linear swelling tests showed that potassium methylsiliconate exhibits a high performance as an effective shale inhibitor in drilling fluids. The inhibition mechanism was investigated by means of a variety of methods including Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and zeta potential measurements. The high degree of inhibition is a result of the synergy of action of potassium cations and methylsiliconate anions. Methylsiliconate anions form a hydrophobic shell around each montmorillonite particle through the adsorption on the edge sites, thus inhibiting the penetration of water into the interlayer. The potassium ions promote the formation of a less hydratable structure of montmorillonite through cation-exchange interaction.
      PubDate: 2014-07-01
       
  • The effect of input pulse duration on the elution curve profile
    • Abstract: Abstract Numerical simulation and new analytical solutions have been used to study the effect of the duration of the input pulse of an adsorbate on the development of the elution curve profile in the adsorption dynamics. Elution curves calculated with regard to finite input pulse duration have been compared with those determined for the instantaneous injection of an adsorbate in the absence of extracolumn broadening. Quantitative regularities of variations in curve parameters measured as the time corresponding to the maximum of the curve and its width at a fixed height as depending on the length of an adsorbent layer have been estimated. The influence of the input pulse duration on the statistical moments of the elution curve has been determined, with the obtained moments being in agreement with the published solution that was previously found using the Laplace transformations. Correspondence between the theoretical and experimental data has been revealed for argon elution from a helium flowing through an activated carbon layer.
      PubDate: 2014-07-01
       
  • Dispersity and stability of foams obtained from poly(vinyl alcohol)
           solution and the properties of resulting foamed cryogels
    • Abstract: Abstract Foams have been generated from aqueous poly(vinyl alcohol) solution by two different methods: dispersion (mechanical) method, i.e., by bubbling a gas through a porous medium into the aqueous poly(vinyl alcohol) solution, and the condensation (chemical) method, i.e., by performing a gas-generating reaction directly in the polymer solution. The effect of the formation method on foam stability and dispersity has been studied. The foam produced by the condensation method of foaming the aqueous poly(vinyl alcohol) solution with nitrogen is more stable and finely dispersed and has a higher expansion ratio than that obtained by bubbling the gas through the polymer solution. Foamed cryogels have been formed by freezing-thawing the foam resulting from the chemical reaction in the polymer solution. The values of the elasticity modulus, melting temperature, and thermal conductivity of the cryogels have been determined.
      PubDate: 2014-07-01
       
  • Adsorption and deformation properties of cation-substituted forms of
           montmorillonite
    • Abstract: Abstract Data on benzene adsorption are employed to determine the adsorption and deformation properties of dehydrated sodium and cobalt forms of montmorillonite. It is found that, at low pressures, the adsorption and deformation of the Co-montmorillonite dehydrated at 293 K are higher than those of the sodium form of the mineral. The increase in the relative deformation of this form of the mineral to 4% at low benzene pressures and further to 11.7% is in good agreement with variations in the heat of adsorption. The relative deformations of the monocationic forms of the mineral dehydrated at 423 K under the conditions of their saturation with benzene are ∼1.2%.
      PubDate: 2014-05-01
       
  • A study of        class="a-plus-plus">n-dodecylammonium
           acrylamido-2-methylpropanesulfonate association in aqueous solutions
    • Abstract: Abstract Association of a micelle-forming monomer, n-dodecylammonium 2-acrylamido-2-methylpropanesulfonate, in aqueous solutions has been studied in a concentration range of 1.5 × 10−3–2.5 × 10−1 M with the use of conductometry, capillary and rotational viscometry, isothermal translational diffusion, and atomic force microscopy. Two critical micelle concentrations have been determined, and the shape of n-dodecylammonium 2-acrylamido-2-methylpropanesulfonate micelles has been proposed.
      PubDate: 2014-05-01
       
  • Structural changes in water clusters during methane adsorption
    • Abstract: Abstract The structure of water clusters that have adsorbed from one to six methane molecules is studied by molecular dynamics simulation. Characteristic structural units of Voronoi and hybrid polyhedra are employed to reveal the structural changes resulting from the attachment of CH4 molecules to the clusters. The most significant changes in topological properties are associated with variations in the number of faces of simplified polyhedra. A change is unambiguously detected in the small-angle peak intensity in the angular distribution of nearest geometrical neighbors determined with the use of the Voronoi polyhedra. The results of two different calculations of the number of hydrogen bonds in the clusters are compared, and the “nonsphericity” coefficients are calculated for the polyhedra.
      PubDate: 2014-05-01
       
  • Synthesis of aerogel-type mesoporous silica
    • Abstract: Abstract Aerogel-type silica has been synthesized via precipitation of a hydrogel from liquid glass in the presence of glycerol followed by an extraction treatment with ethanol. Isotherms of low-temperature nitrogen adsorption-desorption by the prepared samples have been measured. It has been shown that the mesopore size distribution becomes more uniform with an increase in the pH of precipitation and the amount of glycerol, as well as after the extraction treatment of both a liquid hydrogel and xerogels dried at 293 and 373 K.
      PubDate: 2014-05-01
       
 
 
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