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  Subjects -> PHYSICS (Total: 780 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (19 journals)
    - NUCLEAR PHYSICS (48 journals)
    - OPTICS (90 journals)
    - PHYSICS (565 journals)
    - SOUND (20 journals)
    - THERMODYNAMICS (29 journals)

PHYSICS (565 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: 16)
Advanced Composite Materials     Hybrid Journal   (Followers: 52)
Advanced Functional Materials     Hybrid Journal   (Followers: 41)
Advanced Materials     Hybrid Journal   (Followers: 227)
Advanced Science Focus     Free   (Followers: 1)
Advances in Condensed Matter Physics     Open Access   (Followers: 7)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 5)
Advances in High Energy Physics     Open Access   (Followers: 11)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 3)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 15)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 15)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 8)
Advances in Physics Theories and Applications     Open Access   (Followers: 8)
Advances in Remote Sensing     Open Access   (Followers: 9)
AIP Advances     Open Access   (Followers: 6)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 29)
American Journal of Condensed Matter Physics     Open Access   (Followers: 5)
American Journal of Signal Processing     Open Access   (Followers: 9)
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: 5)
Annals of Physics     Hybrid Journal   (Followers: 3)
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: 7)
Applied Composite Materials     Hybrid Journal   (Followers: 37)
Applied Physics A     Hybrid Journal   (Followers: 10)
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: 10)
Applied Spectroscopy     Full-text available via subscription   (Followers: 15)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 3)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access  
Astronomy & Geophysics     Hybrid Journal   (Followers: 3)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 3)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 3)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 10)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 35)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 15)
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: 41)
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)
Case Studies in Nondestructive Testing and Evaluation     Open Access  
Cells     Open Access   (Followers: 1)
CERN courier. International journal of high energy physics     Free   (Followers: 1)
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 1)
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  
Cogent Physics     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Computational Physics     Full-text available via subscription  
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: 105)
Composites Part B : Engineering     Hybrid Journal   (Followers: 133)
Computational Astrophysics and Cosmology     Open Access  
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
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   (Followers: 1)
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)

        1 2 3 4 5 6 | Last

Journal Cover   Colloid Journal
  [SJR: 0.31]   [H-I: 19]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3067 - ISSN (Online) 1061-933X
   Published by Springer-Verlag Homepage  [2291 journals]
  • Synthesis and properties of colloidal indium phosphide quantum dots
    • Abstract: Abstract Semiconductor colloidal quantum dots possessing unique spectral-luminescent characteristics are of great interest for the development of novel materials and devices, which are promising to be used in various fields. However, the contemporary high-quality quantum dots contain Cd, Pb, Hg, Se, and Te ions and are toxic, with this circumstance limiting their wide practical application. Therefore, the attention of researchers has recently been focused on AIIIBV semiconductor quantum dots—in particular, InP ones, which are markedly more environmentally safe. InP quantum dots have spectral characteristics similar to those of well-studied CdSe quantum dots and can, in principle, replace the latter in many cases, especially, taking into account their more pronounced size effect caused by the narrow energy gap and the large Bohr radius of the exciton. Moreover, the stronger InP covalent bond than the ionic one in AIIBVI semiconductors makes it possible to expect that they have a higher photostability and stability in active media. This work presents a review of the modern literature devoted to the synthesis and properties of colloidal indium phosphide quantum dots, which are very promising for use as substitutes of toxic cadmium-based quantum dots.
      PubDate: 2015-07-01
       
  • Formation kinetics of silver nanoparticles in reverse micelles. 1.
           Integral models and the relation between their parameters and microlevel
           processes
    • Abstract: Abstract A method has been proposed for analysis of the evolution of optical absorption spectra measured during the synthesis of silver nanoparticles in reverse micelles. The Volterra “predator-prey” kinetic model has been employed as a basic one. The limiting solutions of this model have been found to be represented by controlled-growth curves (logistic and Gompertz models), parameters of which are determined by characteristics of microlevel processes. It has been shown that there are macrolevel-related physically interpreted parameters of the synthesis process. The tests of the models for the stability with respect to a phase shift (relaxation) have shown its interrelation with the parameters of the controlled-growth model. A correlation has been shown between the space-time characteristics (time and wavelength) of the system. The moments of the passages from one to another stage of the synthesis reaction have been determined.
      PubDate: 2015-07-01
       
  • Effect of nicotinic acid on micellization and viscosity of surfactants in
           aqueous solutions
    • Abstract: Abstract The effect of nicotinic acid on critical micelle concentration (CMC) and viscosity of sodium dodecyl sulfate, cetylpyridinium bromide, and hexadecyl poly[oxyethylene(20)] alcohol solutions is studied. The values of CMC and micelle ionization degree are obtained. The thermodynamic parameters of micellization are determined. The values of Jones-Dole coefficients are determined based on the results of viscosity measurements.
      PubDate: 2015-07-01
       
  • Adsorption studies of microporosity of carbonized carbon black-pitch
           granules
    • Abstract: Abstract Adsorption of nitrogen at 77 K and benzene at 293 K on granules of a porous carbonaceous material obtained through mixing of petroleum pitch and technical carbon (carbon black) followed by granulation and carbonization at 700°C has been studied. Measured adsorption isotherms have been processed with the use of the BET and αS methods to determine the total surface area of samples, as well as the surface area of mesopores and the content of micropores. It has been shown that the obtained samples contain a small amount (less than 0.05 cm3/g) of micropores, which are present in pitch coke; i.e., the number of micropores in the final granules increases with the pitch content in the initial mixture. This fact must be taken into account when producing adsorbents and catalyst supports based on this material.
      PubDate: 2015-07-01
       
  • Computer simulation of the surface layer of an ionic micelle with explicit
           allowance for the contribution of water
    • Abstract: Abstract Ionic micelles have been simulated in an aqueous solution of single-charged counterions using the molecular dynamics method. It has been demonstrated that the contribution of water molecules needs to be explicitly taken into account when computing the electrical field strength of a micelle. This contribution results in a complex local dependence of the electric charge and gives rise to a charge reversal region in the immediate vicinity of the micelle crown, thereby causing a nonmonotonic behavior of the electric potential. The computations have been performed for both cationic and anionic micelles. A model micelle consists of a rigid hydrocarbon core (impenetreable to water molecules and counterions) and cationic fragments of a surfactant. Data obtained for three molecular models of water (SPC, TIP5P, and two-centered S2 models) have been compared with the results of the continual description of the solvent. For all water models, its local contribution to the electric field around micelles is significant even at large distances from the particle surface.
      PubDate: 2015-07-01
       
  • Study of phospholipid-induced phase-separation in amphiphilic drugs
    • Abstract: Abstract Phase separation of five amphiphilic drugs in 10 mM phosphate buffer with added phospholipids has been studied. The drugs used are tricyclic antidepressants (amitriptyline hydrochloride, imipramine hydrochloride, and clomipramine hydrochloride) and phenothiazines (promethazine hydrochloride and promazine hydrochloride). Depending on the nature and structure of studied compounds, the phospholipids caused different effects on the clouding behavior. Cardiolipin decreased the cloud point for all drugs. With amitriptyline, all the additives lowered the cloud points, whereas the clomipramine showed opposite tendency. Imipramine and promethazine led to similar extremal behaviour of cloud point, although promazine, which is structurally similar to promethazine, did not show the same tendency. Thermodynamic analysis of the experimental data suggested that the process of clouding is entropically driven.
      PubDate: 2015-07-01
       
  • The formation of nanocomposites as a result of evaporating droplets of
           dispersions of silver nanoparticles in low-volatile and binary dispersion
           media
    • Abstract: Abstract The regularities of the formation of nanocomposites in the form of ring-shaped deposits during the evaporation of dispersions of cube-shaped silver nanoparticles with an average size of 70 nm on hydrophilic (glass) and hydrophobic (copper) substrates have been studied. The nanoparticles have been synthesized by the polyol method in an ethylene glycol solution. In addition, droplets of dispersions of the same nanoparticles in an ethylene glycol/ethanol mixture and water have been experimentally studied. Geometric parameters and conductivity of the formed ring-shaped deposits have been determined.
      PubDate: 2015-07-01
       
  • Transmembrane gas transfer through a two-layer membrane
    • Abstract: Abstract Gas diffusion through a two-layer membrane is studied within the lattice model of an ideal gas. Analytical expressions are derived for transmembrane diffusion gas flux and permeability of the membrane. It is revealed that the value of the transmembrane gas flux may depend on the membrane orientation. An expression is obtained for the asymmetry coefficient of diffusion gas transfer. It is shown that the revealed effect of asymmetry of membrane diffusion permeability arises in the case of nonlinear sorption isotherms. The results obtained can be used to predict the separating characteristics of composite membranes.
      PubDate: 2015-07-01
       
  • Formation kinetics of silver nanoparticles in reverse micelles. 2.
           Parametric correlation between micro- and macrolevel processes
    • Abstract: Abstract A method based on the isolation of oscillatory spectral components has been proposed for analyzing the fine structure of optical absorption spectra. Almost-periods have been determined for the oscillatory component of the absorption spectrum of a reverse-micellar system containing silver nanoparticles. A correlation has been shown between the almost-periods and the characteristics of an integral kinetic model of the synthesis of silver nanoparticles.
      PubDate: 2015-07-01
       
  • Different methods for describing the nucleation stage in supersaturated
           state decay
    • Abstract: Abstract Different methods used for describing nucleation kinetics including a number of newly-proposed approximations have been analyzed. The causes have been revealed of the appearance of an error in the first approximation of the commonly used method based on the perturbation theory.
      PubDate: 2015-07-01
       
  • Entropy production on sorbing medium surfaces
    • Abstract: Abstract Nonequilibrium processes occurring at interfaces between media one of which is capable of sorbing have been discussed. The entropy production accompanying the passage of a fluid from a bulk phase to the sorbing medium has been determined. It has been shown that temperature and pressure jumps must take place at the interface, which are commonly ignored when describing the transport in membrane systems. The magnitudes of these jumps upon substance transfer through the sorbing media have been determined.
      PubDate: 2015-07-01
       
  • Diffusion coefficients of ionic surfactants with different molecular
           structures in aqueous solutions
    • Abstract: Abstract Aqueous micellar solutions of dodecyl- and hexadecyltrimethylammonium bromides, hexade- cylpyridinium bromide and chloride, domiphen bromide ((dodecyldimethyl-N-2-phenoxyethyl)ammonium bromide), hexadecyltriphenylphosphonium bromide, and sodium dodecyl sulfate have been investigated using dynamic light scattering. A local increase in the diffusion coefficient has been discovered for all ionic surfactants at concentrations higher than the first critical micelle concentration (CMC1). It has been shown that, at the same alkyl chain length and counterion nature, the increase in the diffusion coefficient with surfactant content becomes more pronounced with a reduction in CMC1. The concentration dependences of the diffusion coefficients have been explained in terms of a previously proposed theory formulated for ideal micellar systems. The existence of the local minimum in the diffusion coefficient near CMC1 has been shown to be a general regularity for binary surface-active electrolytes.
      PubDate: 2015-07-01
       
  • Adsorption of components of nucleic acids on a titanium dioxide surface
    • Abstract: Abstract The adsorption of heterocyclic nucleic acid bases and nucleosides at titanium dioxide-aqueous electrolyte solution interface has been studied. Equilibrium constants have been calculated for the acid-base reactions of the surface hydroxyl groups of titanium dioxide and the formation of surface complexes with biomolecules.
      PubDate: 2015-07-01
       
  • Conjugates of gold nanoparticles and poly(ethylene glycol): Formation in
           hydrosol, direct transfer to organic medium, and stability of organosols
    • Abstract: Abstract A onestage method has been developed for phase transfer of gold nanoparticles (NPs) with a diameter of 17.2 ± 0.5 nm from a hydrosol to an organic medium (chloroform). The method is based on the high affinity of thiolated poly(ethylene glycol) (TPEG) for nonpolar solvents and the capability of its molecules for chemisorption on a gold NP surface with the formation of a dense monolayer. Results of thermo-gravimetric analysis have been used to determine the maximum packing density (≈0.85 nm−2) of TPEG molecules on the surface of Au NPs with the aforementioned diameter. It has been shown that TPEG can play the roles of both an NP stabilizer and a phase transfer agent. Therewith, the degree of NP transfer from water to chloroform is ≈90%. The stability to aggregation of the obtained organosols has been found to increase with the chemisorption value of PEG molecules. It has been demonstrated that these organosols can be used to form two-dimensional ensembles of gold NPs on planar substrates.
      PubDate: 2015-07-01
       
  • Polymerization of mixed Langmuir monolayers based on
           10,12-pentacosadiynoic compounds
    • Abstract: Abstract This work reports on the preparation and investigation of ultrathin polymer films based on 10,12-pentacosadiynoic acid and 10,12-pentacosadiynamine. Mixed catanionic Langmuir monolayers formed from these compounds at different component ratios have been studied. It has been established that the electrostatic attraction of the head groups of monolayer components facilitates spreading of the diacetylene monomers over the surface of an aqueous subphase and prevents pentacosadiynoic acid from crystallization. Fiber-optic spectrometry has been employed to study the effect of monolayer packing density on the efficiency of polymerization in the system and to investigate the optical properties of two-dimensional copolymers. It has been shown that the interactions between the oppositely charged head groups in a polymerized monolayer facilitate the formation of a film with a low shrinkage and do not hinder the fast relaxation of the strained blue form of the polymer into its red form characterized by a lower bond conjugation. For the first time, optically uniform ultrathin films based on copolymers of diacetylene surfactants have been obtained and their morphology has been investigated with the help of atomic force microscopy.
      PubDate: 2015-07-01
       
  • Adsorption properties of xerogel prepared from mixed titanium and silicon
           alkoxides
    • Abstract: Abstract Low-temperature nitrogen adsorption-desorption isotherms have been measured for samples of silica, titanium dioxide, and a TiO2/SiO2 composite xerogel prepared via acid hydrolysis and polycondensation of tetraethoxysilane, titanium isopropoxide, and a mixture thereof, respectively, in the presence of cetylpyridinium chloride at different Ti/Si molar ratios. It has been shown that nitrogen adsorption isotherms for silica are of type I and indicate the formation of micropores, while those for titanium dioxide and the TiO2/SiO2 composite are of type IV, which is characteristic of mesoporous adsorbents.
      PubDate: 2015-07-01
       
  • On the role of the activity coefficient in the processes of diffusion of
           ionic surfactants in micellar solutions
    • Abstract: Abstract Theoretical relations are formulated to describe the effect of an activity coefficient reflecting interparticle interaction on the diffusion coefficient of a surfactant in a micellar system. The activity coefficient of hexadecyltrimethylammonium bromide in an aqueous micellar solution is measured with a bromide-selective electrode. Analysis of the data obtained shows that, above the critical micelle concentration, surfactant mobility and solution viscosity stronger affect an increase in the diffusion coefficient followed by its reduction than the interparticle interaction in a micellar system dose.
      PubDate: 2015-07-01
       
  • Adsorption of organic acids on a cerium dioxide surface
    • Abstract: Abstract Adsorption of organic acids from aqueous solutions on a cerium dioxide surface has been quantitatively studied in terms of the theory of complexation at interfaces. Potentiometric titration data have been used to calculate the equilibrium constants of acid-base reactions of surface hydroxyl groups of cerium dioxide. The study of adsorption of organic acids on a cerium dioxide surface from aqueous solutions as depending on pH has allowed us to calculate surface complexation constants complexation constants.
      PubDate: 2015-07-01
       
  • The effect of salts on micellization in C 12 mimBr/Triton X-100 aqueous
           mixtures and on the surface properties of the solutions
    • Abstract: Abstract Herein, we report our studies on the mixed aqueous solutions of 1-dodecyl-3-methylimidazolium bromide (C12mimBr) and Triton X-100 in the presence of sodium bromide and sodium chloride by surface tension and conductivity measurement methods. The critical micelle concentration and several other parameters such as maximum surface excess, minimum area per molecule and surface pressure at the CMC were calculated from the data of surface tension investigation. The critical micelle concentration values decreased with the increase of salt concentration. Rubingh’s theory was applied to calculate the mole fraction (X 1) of C12mimBr in the mixed systems. The results showed that X 1 increased most significantly with the concentration of the salt in the presence of NaBr. The values of standard Gibbs energies of micellization and interfacial adsorption have also been calculated; both were found to be negative for all systems, indicating the spontaneity of micellization and adsorption of the surfactants.
      PubDate: 2015-07-01
       
  • A study of the effect of the composition of hydrated chromium oxides on
           their electrorheological activity
    • Abstract: Abstract X-ray amorphous hydrated chromium oxides of variable compositions have been obtained, with the total number of water moles in them being 4.0–4.9 depending on the conditions of precipitation and aging. It has been established that, along with the structural water contained in the form of OH groups, strongly bound hydration water molecules are present that are eliminated in a temperature range of 60–300°C. Electrorheological activity of suspensions based on partly dehydrated chromium oxides has been studied. The electrorheological effect increases with the number of water moles in a dispersed oxide and suspension temperature.
      PubDate: 2015-05-01
       
 
 
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