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  Subjects -> PHYSICS (Total: 802 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (21 journals)
    - NUCLEAR PHYSICS (50 journals)
    - OPTICS (86 journals)
    - PHYSICS (578 journals)
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PHYSICS (578 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 19)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 65)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Materials     Hybrid Journal   (Followers: 249)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
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: 6)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 18)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 37)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 3)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 10)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 15)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5)
Annals of Physics     Hybrid Journal   (Followers: 4)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 3)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 10)
Annual Review of Condensed Matter Physics     Full-text available via subscription  
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 47)
Applied Physics A     Hybrid Journal   (Followers: 7)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 33)
Applied Physics Research     Open Access   (Followers: 3)
Applied Physics Reviews     Hybrid Journal   (Followers: 9)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 5)
Archive for Rational Mechanics and Analysis     Hybrid Journal  
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access   (Followers: 1)
Astronomy & Geophysics     Hybrid Journal   (Followers: 47)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 8)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 10)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Berkala Fisika Indonesia     Open Access  
Biomaterials     Hybrid Journal   (Followers: 44)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biophysical Reviews     Hybrid Journal   (Followers: 1)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 5)
Boson Journal of Modern Physics     Open Access   (Followers: 11)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Materials Science     Open Access   (Followers: 42)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 3)
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 Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 13)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 9)
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 7)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 13)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Physics     Hybrid Journal  
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   (Followers: 1)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 178)
Composites Part B : Engineering     Hybrid Journal   (Followers: 226)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 2)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 7)
Cryogenics     Hybrid Journal   (Followers: 49)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 56)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  
ECS Journal of Solid State Science and Technology     Hybrid Journal   (Followers: 5)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 19)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 40)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 68)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 23)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 5)
EPJ Nonlinear Biomedical Physics     Open Access  
EPJ Quantum Technology     Open Access  
EPJ Techniques and Instrumentation     Full-text available via subscription  
EPJ Web of Conferences     Open Access  
European Journal of Physics     Full-text available via subscription   (Followers: 18)
European Journal of Physics Education     Open Access   (Followers: 3)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 16)
European Physical Journal C     Hybrid Journal   (Followers: 1)
Europhysics News     Open Access  
Experimental Mechanics     Hybrid Journal   (Followers: 22)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 56)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 13)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 3)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 26)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 114)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 153)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global Journal of Physics     Open Access   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 6)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 12)
High Energy Density Physics     Hybrid Journal   (Followers: 2)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 21)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 65)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access  
Imaging Science Journal     Hybrid Journal   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 20)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 38)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 36)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 39)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Intermetallics     Hybrid Journal   (Followers: 22)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 11)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 33)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 23)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 34)
International Journal of Fracture     Hybrid Journal   (Followers: 12)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 34)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 5)

        1 2 3 | Last

Journal Cover Colloid Journal
  [SJR: 0.316]   [H-I: 23]   [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  [2355 journals]
  • The “fine structure” of the slow micellar relaxation mode and the
           aggregation rates in the range between a potential hump and well in the
           work of aggregation
    • Authors: L. Ts. Adzhemyan; A. K. Shchekin; I. A. Babintsev
      Pages: 295 - 302
      Abstract: Abstract An analytical expression has been derived for the quasi-stationary size distribution of surfactant aggregates in a micellar system approaching the final equilibrium state. In contrast to previously known relations, the derived expression takes into account variations in the concentration of monomers during the slow relaxation and enables one to determine the previously unknown fine structure of the linearized mode of slow relaxation, i.e., its dependence on the aggregation numbers in the range between the maximum and minimum of the work of aggregation. This dependence has been reliably confirmed by the numerical solution of the set of linearized Becker–Döering difference equations, which describe the molecular mechanism of the kinetics of micellization and micellar relaxation. In turn, the expression found for the relaxation mode makes it possible to refine the analogous “fine structure” of aggregation rates at different points of the same range between the maximum and minimum of the work of aggregation, in which the aggregation rates appear to be low but exhibit a nonmonotonic behavior. This behavior is also confirmed by the numerical solution of the Becker–Döering difference kinetic equations.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030024
      Issue No: Vol. 79, No. 3 (2017)
       
  • Colloid chemical properties of hydrated tungsten trioxide hydrosols
    • Authors: A. V. Aleksandrov; N. N. Gavrilova; V. V. Nazarov
      Pages: 303 - 309
      Abstract: Abstract Hydrosols of hydrated tungsten trioxide WO3 • nH2O have been synthesized via peptization of a precipitate obtained by hydrolysis of potassium tungstate. It has been shown that the resulting sols are stable to aggregation in a pH range of 3.0–4.5. Hydrodynamic diameters and ζ potentials of WO3 • nH2O particles have been determined as functions of dispersion medium pH. In addition, their density and degree of hydration have been found for the stable sols. The thickness of particle surface layers has been estimated.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030036
      Issue No: Vol. 79, No. 3 (2017)
       
  • Molecular-dynamics simulation of the surface layer of a nonionic micelle
    • Authors: A. A. Vanin; E. N. Brodskaya
      Pages: 310 - 316
      Abstract: Abstract A spherical micelle structure has been studied for cationic (n-dodecyltrimethylammonium chloride) and nonionic (hexaethylene glycol mono-n-hexyl ether) surfactants in pure water and a sodium chloride solution. The molecular-dynamics has been used to simulate the self-assembly of aggregates from an initially homogeneous mixture of water and surfactant molecules and to gain insight into the structure of micelles and their surface layers. The radial distribution functions obtained for charged components have been employed to calculate the local electric potentials of the micelles and the contributions from the charges of water atoms, ions, and a surfactant to it. It has been shown that, similarly to previously studied ionic micelles, in nonionic surfactant micelles, the contributions from water molecules and polar groups (and ions in the case of the salt solution) to the electric potential are mutually compensated in the region of the electrical double layer. Therefore, the resultant electric potential of the surface layer rapidly tends to zero.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030188
      Issue No: Vol. 79, No. 3 (2017)
       
  • Theoretical estimation of differential coefficients of ion-exchange
           membrane diffusion permeability
    • Authors: O. A. Demina; N. A. Kononenko; I. V. Falina; A. V. Demin
      Pages: 317 - 327
      Abstract: Abstract It has been shown that the differential coefficients of the diffusion permeability of MK-40 and Nafion 425 sulfonic cation-exchange membranes to solutions of diverse electrolytes can be calculated within the framework of the theory of generalized conductivity of structurally inhomogeneous membranes with the use of model transport-structural parameters. The calculation has been performed on the basis of experimentally measured concentration dependences of the specific electrical conductivities and diffusion fluxes of electrolytes through membranes into water. The results of the model calculation are in satisfactory agreement with the data obtained by an independent method without resorting to notions of the structural organization of a membrane.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030048
      Issue No: Vol. 79, No. 3 (2017)
       
  • The effect of water on the shape of aggregates in water-in-oil
           microemulsions according to data of computer simulation
    • Authors: I. V. Kopanichuk; A. A. Vanin; E. N. Brodskaya
      Pages: 328 - 332
      Abstract: Abstract A sodium 1,4-bis[(2-ethylhexyl)oxy]-1,4-dioxybutane-2-sulfonate (NaАОТ)–water–isooctane three-component system is calculated by the molecular-dynamics method. In a wide range of relative water contents w 0, reverse micelles are obtained with different morphologies: single spherical and cylindrical micelles and their spatial networks. It is shown that w 0 and surfactant concentration are the main shape-generating factors. The data obtained are in good agreement with previous results of simulations and experimental data.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x1703005x
      Issue No: Vol. 79, No. 3 (2017)
       
  • Numerical simulation of bulk condensation in gas-vapor mixtures flowing
           through a nozzle
    • Authors: N. M. Kortsenshteyn; L. V. Petrov
      Pages: 333 - 340
      Abstract: Abstract The behavior of heavy water and n-nonane vapors mixed with an incondensable gas has been numerically simulated under the conditions of nonequilibrium bulk condensation. The efficiency of the employed mathematical model has been verified using available experimental data. The applicability of the conventional nucleation theory and modification thereof to the description of bulk condensation in a gas–vapor mixture flowing through a nozzle has been analyzed.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030061
      Issue No: Vol. 79, No. 3 (2017)
       
  • Energy dissipation accompanying atomic-scale friction: Nonlocality and
           memory
    • Authors: S. Yu. Krylov; J. W. M. Frenken
      Pages: 341 - 345
      Abstract: Abstract It has been shown that, in spite of the success achieved in describing atomic-scale friction, serious problems concerning friction force microscopy remain unsolved. The traditional theoretical approach, which, on default, ignores possible effects of nonlocality and memory, leads to a number of contradictions. Proceeding from the general concepts of nonequilibrium statistical mechanics, rigorous analysis, and simple atomistic simulation, it has been shown that the phonon mechanism of energy dissipation upon friction is essentially nonlocal with the prevalence of memory effects.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030073
      Issue No: Vol. 79, No. 3 (2017)
       
  • Formation dynamics of reverse micelles and nanosized effects that
           accompany chemical reduction of silver nanoparticles in them
    • Authors: V. I. Kuz’min; A. F. Gadzaov; D. L. Tytik; V. V. Vysotskii; A. A. Revina; S. A. Busev; O. V. Suvorova
      Pages: 346 - 352
      Abstract: Abstract Dynamic light scattering has been employed to study the time evolution of a sodium bis(2-ethylhexyl) sulfosuccinate/isooctane/water/quercetin/AgNO3 system during the formation of reverse micelles (RMs), as well as water solubilization and formation of Ag nanoparticles (NPs) in them. It has been shown that physicochemical processes occurring in the reverse micellar system lead to the formation of light-scattering elements with average sizes of 0.67−2 nm (individual molecules of the surfactant and reductant), 2.5−4.5 nm (“dry” RMs) and 16−20 nm (RMs containing Ag NPs). The synthesis is accompanied by the formation of silver NPs with other sizes in an amount of less than 5%.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030097
      Issue No: Vol. 79, No. 3 (2017)
       
  • Three stages of water microdroplet evaporation on hydrophobized surface:
           Comparison between steady-state theory and experiment
    • Authors: A. E. Kuchma; A. K. Shchekin; N. E. Esipova; D. V. Tatyanenko; S. V. Itskov; A. V. Savin
      Pages: 353 - 359
      Abstract: Abstract Three consecutive stages of evaporation of a sessile water microdroplet are studied both theoretically and experimentally under the conditions of contact angle hysteresis. The influence of thermal effects on the dynamics of droplet evaporation is quantitatively investigated on the basis of the obtained experimental results. The features of droplet evolution are analyzed at the final stage, when both the contact angle and the radius of the droplet base decrease with time. It is shown that evaporation at this stage also occurs in a steady-state regime, but the average droplet temperature approaches the ambient temperature.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030085
      Issue No: Vol. 79, No. 3 (2017)
       
  • A study of the interaction between polyelectrolyte-coated nanostructured
           CaCO 3 particles and a stearic acid monolayer spread at the water/air
           interface
    • Authors: E. P. Mironov; I. V. Marchenko; V. V. Artemov; T. V. Bukreeva
      Pages: 360 - 367
      Abstract: Abstract The influence of nanostructured CaCO3 particles, both uncoated and coated with a polyelectrolyte (poly(diallyldimethylammonium chloride), polyethyleneimine, fluorescein-5-isothiocyanate-labeled poly(allylamine hydrochloride), or sodium polystyrene sulfonate), on a stearic acid monolayer spread on the surface of an aqueous subphase has been studied. The interaction of the particles present in the subphase with the monolayer as depending on the presence and composition of a polymer coating has been estimated with the help of compression isotherms and the Brewster angle microscopy. The monolayers were transferred from the aqueous subphase onto a solid substrate and studied by scanning electron microscopy. Strong interaction has been revealed between the calcium carbonate particles and the stearic acid monolayer. It has been shown that the transfer of the monolayer from the aqueous suspension surface onto the solid substrate may be accompanied by the detachment of the polymer coating from the surface of CaCO3 particles or their transfer together with the monolayer.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030103
      Issue No: Vol. 79, No. 3 (2017)
       
  • Diffusion of monoalkyl ethers of poly(ethylene glycols) and
           octyl-β-D-glucopyranoside in micellar solutions
    • Authors: T. G. Movchan; E. V. Plotnikova; I. V. Soboleva; A. I. Rusanov
      Pages: 368 - 377
      Abstract: Abstract Diffusion coefficients of monoalkyl ethers of poly(ethylene glycols), С8Е4 and С12Е5, and octyl-β-D-glucopyranoside have been measured in aqueous micellar solutions within wide ranges of temperatures and concentrations by dynamic light scattering. The study of the С12Е5–water system containing cylindrical micelles has been supplemented with viscosity measurements, which make it possible to better monitor structural transformations and phase transformations.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030115
      Issue No: Vol. 79, No. 3 (2017)
       
  • Dependence of SBA-15 formation on the block copolymer concentration in the
           course of synthesis with precursor containing ethylene glycol residues
    • Authors: I. V. Postnova; Chang-Sik Ha; Yu. A. Shchipunov
      Pages: 378 - 385
      Abstract: Abstract The formation of silica is governed by two parallel processes triggered by the addition of a precursor to a solution of P123 block copolymer. One process is sol–gel synthesis, while the other is the transformation of an initial micellar phase consisting of spherical micelles of P123 into a hexagonal mesophase, which serves as a template. The gelation of the reaction mixture terminates all transformations, thus making it possible to examine the phase state of the block copolymer at the moment of the sol–gel transition. The systematic study of systems with different P123 concentrations has shown that the structure, morphology, and porosity of the material is determined by the ratio between the rates of the aforementioned processes. A material with the structure of SBA-15 containing hexagonally packed cylindrical mesopores is formed at a block copolymer content of 10 wt %. As the P123 concentration is reduced, the rate of the transformations of its structures decreases relative to the rate of the sol–gel process. Analysis of electron micrographs has revealed that the material being formed contains, initially, irregular short rodlike mesopores rather than cylindrical ones; then, as the P123 concentration is further decreased, amorphous silica arises in the material. The role of their templates is played by intermediate structures formed during the transformation of the P123 micellar phase into the hexagonal mesophase. Advantages of the SBA-15 synthesis with the precurosr containing ethylene glycol residues are the good reproducibility, one-pot procedure, no addition of acid and organic solvent or heating, and the formation of bimodal monolithic material containing both meso- and macropores.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030127
      Issue No: Vol. 79, No. 3 (2017)
       
  • Sizes of ionic surfactant micelles and their clustering according to data
           on viscosity of micellar solutions
    • Authors: O. G. Us’yarov; E. V. Plotnikova; T. G. Movchan
      Pages: 386 - 392
      Abstract: Abstract Data available on the viscosity of micellar solutions of surfactants belonging to the homologous series of alkyltrimethylammonium bromides containing 10, 12, 14, and 16 carbon atoms in their alkyl chains, as well as sodium dodecyl sulfate solutions, have been analyzed. It has been shown that the systems under consideration may be adequately described by the Einstein equation. The results obtained have made it possible to identify the concentration ranges in which the intermicellar interaction does not affect significantly the flow of the micellar solutions. Data on the relative viscosity of the studied micellar solutions have been employed to calculate the hydrodynamic radii of micelles formed by the surfactants with different lengths of hydrocarbon radicals in their molecules.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030164
      Issue No: Vol. 79, No. 3 (2017)
       
  • Electrical-percolation effects in micellar solutions of
           alkyltrimethylammonium bromides
    • Authors: O. G. Us’yarov; E. V. Plotnikova; T. G. Movchan
      Pages: 393 - 398
      Abstract: Abstract Specific conductivity K of aqueous solutions of alkyltrimethylammonium bromides has been studied in a wide range of concentrations c of surfactants containing 10, 12, 14, and 16 carbon atoms in alkyl chains. In general, three break points have been observed in the K(с) dependences. The first point observed upon increasing overall solution concentration corresponds to critical micelle concentration CMC1. The CMC1 values of alkyltrimethylammonium bromides decrease with an increase in the alkyl chain length. They are in satisfactory agreement with the published data. It has been supposed that the second break point in the K(с) dependences corresponds to the formation micellar structures as clusters and the appearance of channels with a higher specific conductivity, which is provided by the contribution from the overlap of electrical double layers existing in the vicinities of micelles. Surfactant concentrations corresponding to these break points have been called “critical percolation concentrations” (CPCs). The position of a CPC in the concentration scale strongly depends on alkyl radical length. All K(с) curves exhibit a third break, which corresponds to second critical micelle concentration CMC2, at which the properties of ionic-surfactant solutions may substantially change because of the appearance of supramicellar structures. The experimental data obtained have been used to evaluate the parameters of the model of electrical percolation for micellar solutions, i.e., effective conductivity \({\tilde K_m}\) and effective micelle radius r 0.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030176
      Issue No: Vol. 79, No. 3 (2017)
       
  • Mechanisms for ion retention in molecular water clusters in a planar
           nanopore against the background of thermal fluctuations
    • Authors: S. V. Shevkunov
      Pages: 399 - 413
      Abstract: Abstract The Monte Carlo method has been used to calculate the potential of mean force for Na+ and Cl− ions interacting in model planar nanopores with structureless walls under the conditions of the material contact with water vapor at room temperature and above water boiling point. The interactions have been described using a detailed many-body model calibrated with respect to experimental data on the free energy of attachment reactions and the results of quantum-chemical calculations. Dissociation becomes possible when the vapor density increases as a sufficient number of molecules are pulled into the field of the ions. The dissociation proceeds sooner under the conditions of the nanopore than in bulk water vapor. Hydration decreases the energy of the dissociated state; however, the entropy component of the free energy partly compensates for the decrease in the internal energy, thereby increasing the stability of a contact ion pair. After the dissociation of a contact ion pair (CIP), ions are retained within a cluster in the state of a solvent-separated ion pair (SSIP). Fluctuations in the number of pulled-in vapor molecules, which are correlated with fluctuations in the interionic distance, stabilize the SSIP states with respect to recombination, while a decrease in the screening of the field of ions under the conditions of the nanopore stabilize the SSIP states with respect to cluster decay. The conditions of the nanopore stimulate the passage of an ion pair from the CIP to the SSIP state due to the rearrangement of the statistical weights in favor of molecules being located in the interionic gap. Thus, under the conditions of the nanopore, the stability of the SSIP states increases with respect to both the recombination of the ions and the decay of the ion-molecular associate.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030140
      Issue No: Vol. 79, No. 3 (2017)
       
  • Explosive spreading of a concentrated emulsion over a liquid surface
    • Authors: A. V. Semakov; E. M. Postnov; V. G. Kulichikhin; A. Ya. Malkin
      Pages: 414 - 417
      Abstract: Abstract Spreading of a droplet of a concentrated oil-in-water emulsion over a water surface has been monitored. At the initial moment, this process proceeds at a high rate like an explosion. The stationary spreading is soon followed by the development of instability with the formation of a flower-shaped structure. At the final stage, the spot of the spread liquid may somewhat shrink. The characteristic times of these three stages are about 0.1, 1, and 10 s. The explosive character of the initial stage of spreading may be explained by the loss of dimensionality (3D → 2D) and the passage of the dispersion medium into the aqueous substrate with the release of a high free energy, while the subsequent spreading of the oil spot is explained by the Marangoni effect. A decrease in the energy of the interaction between dispersed phase (“oil”) particles in the emulsion leads to the phase separation. The final shrinkage of the oil spot may be due to the surface wave disturbance, which arises upon the explosive phase separation in the emulsion.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030139
      Issue No: Vol. 79, No. 3 (2017)
       
  • Dimethyl sulfoxide structuring in the presence of aqueous manganese(II)
           sulfate solution
    • Authors: Yu. B. Tsaplev
      Pages: 418 - 419
      Abstract: Abstract Mixing of an aqueous MnSO4 solution with liquid dimethyl sulfoxide leads to gelation and loss of fluidity of the mixture.
      PubDate: 2017-05-01
      DOI: 10.1134/s1061933x17030152
      Issue No: Vol. 79, No. 3 (2017)
       
  • Preparation of pickering-emulsion-based capsules with shells composed of
           titanium dioxide nanoparticles and polyelectrolyte layers
    • Authors: P. A. Demina; D. O. Grigoriev; G. M. Kuz’micheva; T. V. Bukreeva
      Pages: 198 - 203
      Abstract: Abstract A procedure has been proposed for the preparation of capsules with shells composed of titanium dioxide nanoparticles and polymers via the formation of Pickering emulsions (colloidosomes) followed by layer-by-layer deposition of polyelectrolytes. The feasibility of stabilizing oil droplets of emulsions by spontaneous adsorption of partly hydrophobized nanoparticles of anatase-form titanium dioxide at the oil/water interface has been studied. Conditions have been determined for the formation of stable colloidosomes and the subsequent layer-by-layer deposition of oppositely charged polyelectrolytes onto their surfaces. It has been shown that hydrophobic dyes may be encapsulated using the procedure developed for the preparation of the capsules. The photocatalytic activity of TiO2 particles occurring in the shell has been demonstrated by the example of degradation of Nile red which is incorporated in the oil core of a capsule.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061933x1702003x
      Issue No: Vol. 79, No. 2 (2017)
       
  • Comparative study of Cr(III) adsorption by carbon nanotubes and active
           carbons
    • Authors: M. V. Manilo; Z. Z. Choma; S. Barany
      Pages: 212 - 218
      Abstract: Abstract The adsorption of trivalent chromium ions from aqueous solutions on the surface of carbon materials, namely, multiwall carbon nanotubes (NTs) and two samples of active carbon, is studied depending on pH and adsorbate concentration in the system. Isotherms of Cr(III) adsorption by the aforementioned materials are obtained. It is shown that chromium ions are predominantly bound by surface carboxyl groups. The adsorption of chromium ions reduces the electrokinetic potential of NTs and, at chromium concentrations C Cr(III) > 10–5 M, leads to the reversal of the surface charge. The adsorption value decreases in the series NT > Merck carbon > Norit carbon, in contrast to an increase in the adsorbate affinity to the adsorbent in this series, as determined from the slope of the initial section of the Langmuir isotherms. Small amounts of chromium ions sorbed at low concentrations in solution (C Cr(III) ≤ 10–5 M) are comparable with the concentration of hydrogen ions displaced from the surface, thus making it possible to suppose the existence of an ionexchange adsorption mechanism. As the concentration of Cr(III) increases, the equivalent displacement of H+ is violated, thereby indicating the development of other adsorption mechanisms (complexation).
      PubDate: 2017-03-01
      DOI: 10.1134/s1061933x17020053
      Issue No: Vol. 79, No. 2 (2017)
       
  • Soft ionization mass spectrometry for studying desorption of bioactive
           compounds from a shungite surface
    • Authors: K. E. Polunin; I. S. Goncharova; A. V. Ul’yanov; I. A. Polunina; A. K. Buryak
      Pages: 250 - 257
      Abstract: Abstract Ionized products of desorption of biologically active amino compounds (1,1-dimethylhydrazine, diglycine, tyrosine, and tryptophan) from the surface of a modified mineral (shungite-III, Karelia) have been investigated by laser desorption/ionization mass spectrometry methods (MALDI and SALDI). The composition of the ionized products of laser desorption of amino acids from the surface of nanodispersed shungite is almost independent of carbon content in shungite. The comparative analysis of ionized organic compounds desorbed from the surfaces of shungite and carbon black has led to the suggestion that the decomposition and surface transformation of 1,1-dimethylhydrazine molecules mainly occur on the inorganic components of shungite.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061933x17020090
      Issue No: Vol. 79, No. 2 (2017)
       
 
 
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