for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> PHYSICS (Total: 734 journals)
    - ELECTRICITY AND MAGNETISM (7 journals)
    - MECHANICS (18 journals)
    - NUCLEAR PHYSICS (44 journals)
    - OPTICS (84 journals)
    - PHYSICS (536 journals)
    - SOUND (17 journals)
    - THERMODYNAMICS (28 journals)

PHYSICS (536 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: 279)
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]
  • The relationship between micro- and mesoporous substructures upon removal
           of colloidal silica from porous glasses subjected to alkaline treatment
    • Abstract: Abstract The effect of alkaline treatment of two basal liquation sodium borosilicate porous glasses on their micro- and mesoporous substructures has been studied. The morphology of pores has been investigated and the structural characteristics of micro- and mesoporosity have been determined by the equilibrium and kinetic adsorption-desorption methods at low, moderate, and high relative pressures. It has been established that the alkaline treatment leads to a substantial increase in the volume of mesopores and a noticeable decrease in the volume of micropores, which correlates with a reduction in the specific surface area of the mesopores. After the alkaline treatment, the trimodal distribution and the average diameter (0.5–0.6 nm) of micropores remain unchanged and ultramicropores do not arise in the range of 0.27–0.37 nm. It has been concluded that micropores represent only the regions of interglobular contacts of secondary silica in liquation channels with sizes of 1–2 diameters of an adsorbate molecule. The alkaline treatment is accompanied by the structuring and dissolution of silica globules in liquation channels; as a result, wide-porous glass samples with monomodal interglobular pores are obtained, while new micropores are not formed via the etching of channel walls in the glass matrix. Correlation dependences between the coordination number, porosity, and diameters of pores and globules of colloidal silica have been proposed for a large set of standard globular packings. It has been shown that, as the boron content in a porous glass rises, secondary silica globules in liquation channels grow, while their packing becomes looser.
      PubDate: 2014-03-01
       
  • Water in extremely narrow planar pores with crystalline walls. 2.
           Thermodynamics
    • Abstract: Abstract The free energy, entropy, and work of water vapor adsorption in planar pores with widths of 0.62 and 1.25 nm located in a silver iodide crystal parallel to its basal face have been computed at the molecular level. In contrast to adsorption on a free surface, the adsorption in the pores proceeds in three stages, i.e., the formation of molecular films on the walls, coalescence of the films, and densification of the fluid in the pore volume. At the second stage, the equilibrium between the fluid in the pore and the vapor over the pore at temperatures corresponding to normal conditions is thermodynamically unstable and accompanied by the development of a free energy barrier and the existence of metastable states. As temperature is elevated, the instability is gradually evened out; however, its signs remain preserved even at the boiling temperature of water. Extremely narrow pores with widths smaller than 1 nm are always filled with water under conditions of even a rather dry natural atmosphere. The filling of pores several nanometers wide in strongly unsaturated water vapors overcomes the free-energy barrier; however, the fluid that has filled the pore remains stable with respect to evaporation in vapors with densities lower than the density of saturated vapor by several orders of magnitude. The existence of the free-energy barrier and metastable states in nanosized breaks in crystals creates conditions for hysteresis of adsorption-desorption cycles.
      PubDate: 2014-03-01
       
  • Determination of the fiber-size distribution function in polydisperse
           dielectric fibrous materials
    • Abstract: Abstract A simple method has been proposed for determining the average fiber length in unit volume of a polydisperse fibrous material as depending on fiber diameter. The method consists in the measurement of light attenuation as a function of the distance from an examined sample. The method entails comparison of the measured energy fluxes that reach a detector before and after scattering by an examined fibrous material sample and uses an integral relation that expresses the intensity of light transmitted through a random medium via the electric-field correlation function. Formulas have been found for the electric-field correlation function after the passage through a layer of a polydisperse fibrous material with random arrangement and orientation of fibers. The obtained correlation function enables one to derive an integral equation that expresses the logarithmic ratio of the energy fluxes reaching the radiation detector before and after the passage through a scattering medium via the fiber size-distribution function. Solution of this integral equation makes it possible to determine the fiber-size distribution function from the light attenuation measured as depending on the distance from the point of observation. Experiments have been carried out for several fibrous filters and relevant calculations have been presented. The results of the solution of the integral equation agree with the data obtained by other experimental methods and with visual processing of electron micrographs.
      PubDate: 2014-03-01
       
  • Dilational rheology of spread and adsorbed layers of silica nanoparticles
           at the liquid-gas interface
    • Abstract: Abstract This short review is devoted to recent achievements in studies of the dilational surface rheological properties of the systems containing complexes of silica nanoparticles with conventional surfactants. It is shown that there is a surfactant concentration range where the dynamic surface elasticity reaches extremely high values up to 1000 mN/m. This result can explain the formation of very stable foams and emulsions containing nanoparticles. In some surfactant concentration ranges the adsorption layer is characterized by a non-linear response to small compressions or expansions of the liquid surface. Possible causes of this behavior and the mechanism of main relaxation processes are briefly discussed.
      PubDate: 2014-03-01
       
  • Water in extremely narrow planar pores with crystalline walls. 1.
           Structure
    • Abstract: Abstract Computer simulation has been employed to study the structure of water condensate filling planar pores 1.25 and 0.62 nm wide located parallel to the basal face in a silver iodide crystal at 260 K. All stages of adsorption of single molecules up to complete pore filling have been described. At an initial stage, strong clustering of molecules is observed on the walls; then, the walls are covered with a monomolecular film; and, at the final stage, molecules are adhered to the surface of the film, thus filling the internal space of the pore. First, adsorption occurs at the wall containing positive ions on the surface and, then, on the opposite wall with negative ions. On both walls, adsorbed molecules are adhered to the surface via the interaction with ions of the second crystallographic layer; given this, two types, α and β, of molecule plane orientation are realized on opposite walls. The adhesion of an adsorbed molecular film to molecules filling the interior of the pore requires the partial transition of film molecules from the α- to the β-type orientation on one wall and the inverse transition on the other wall. The deficiency of α-oriented molecules on one wall and β-oriented ones on the other is the main reason for poor wettability of the surface of the monomolecular films adsorbed on the walls. In an extremely narrow pore, molecules are simultaneously captured in the field of both walls. The forces acting from the sides of both walls result in the separation of a film into spots having structures matched to the crystalline structure of each wall, with the film being on the verge of breakage.
      PubDate: 2014-03-01
       
  • A binary catalytic system based on mixed monolayers of a phospholipid and
           amphiphilic bis(Zn2+-cyclen)
    • Abstract: Abstract Herein, we report on the study of the properties of mixed Langmuir monolayers composed of a synthetic amphiphilic receptor, alkylated bis-cyclic zinc complex of 1,4,7,10-tetraazacyclododecane, and a lipid, distearoyl phosphatidylcholine. The kinetics of a hydrolysis of a model substrate, bis(p-nitrophenyl) phosphate in individual and mixed monolayers of the amphiphilic receptor was studied by using fiber-optical absorption/reflection spectroscopy. The hydrolysis of the organic phosphate in these planar systems proceeded by a two-stage mechanism. This mechanism comprises substrate adsorption on the monolayer via a reaction of the zero order with respect to the adsorbate followed by the pseudo-second-order reaction of the hydrolytic decomposition of the substrate. Unlike the reaction in molecular and colloidal solutions, the process in the monolayer results in the complete decomposition of the model substrate into nitrophenol and phosphate anion. The amphiphilic receptor is directly involved in this reaction to yield a stable complex with the phosphate anion as a resulting product of hydrolysis. An increase in the receptor affinity for the phosphate anion is, most likely, due to the effect of the interface on the strength of the coordination bonds in an intermediate product and the receptor-phosphate complex. Immobilization of the receptor within the lipid matrix increases the rate of substrate decomposition in the monolayer by almost an order of magnitude. We suggested an explanation for the observed effect of the lipid matrix on the catalytic properties of the amphiphilic metallocomplex.
      PubDate: 2014-03-01
       
  • Rheological properties of alcohol-coal slurries
    • Abstract: Abstract The rheological properties of coal slurries prepared using lower alcohols of the ethanol-pentanol series as dispersion media are investigated. It is shown that an increase in the length of alcohol hydrocarbon radical leads to a rise in the viscosity and shear stress of the alcohol-coal slurries.
      PubDate: 2014-03-01
       
  • The effect of surfactant concentration on the geometry of pores resulting
           from etching of poly(ethylene naphthalate) films irradiated by high-energy
           ions
    • Abstract: Abstract The influence of temperature and concentrations of an alkali and a surfactant in etching solutions on the structural and transport characteristics of membranes produced by etching latent tracks of high-energy heavy ions in poly(ethylene naphthalate) films has been studied. The presence of a surfactant provides the formation of spindle-shaped pores narrowing in the direction toward the film surfaces. A procedure has been developed for the quantitative assessment of the degree of widening of spindle-shaped pores in their central part. The transport properties of track membranes with spindle-shaped and cylindrical pores have been compared.
      PubDate: 2014-03-01
       
  • On the thermodynamic theory of the strength of solids: 5. Energetic
           characteristics of a crack with a meniscus and ultimate solid strength
    • Abstract: Abstract The thermodynamic relations describing the formation work of a crack with a meniscus inside it have been analyzed for capillary condensation and evaporation processes. The conformal and depth mechanisms of crack growth have been discussed. It has been shown that the capillary forces alone cannot cause the fracture of a solid upon the formation of a meniscus in a crack. Criteria have been established for the strength upon the brittle fracture, and corrections related to the presence of a meniscus in a crack have been calculated. As a rule, the formation of a meniscus reduces the ultimate strength.
      PubDate: 2014-03-01
       
  • Radiotracers in kinetics of ion-isotopic exchange reactions using anion
           exchange resins indion-103 and indion-870
    • Abstract: Abstract The kinetics of iodide and bromide ion-isotopic exchange reactions was studied by radio analytical technique using 131I and 82Br as tracer isotopes. The parameters like specific reaction rate (min−1), amount of ions exchanged (mmol), initial rate of ion exchange (mmol/min) and logK d were studied to evaluate the performance of nuclear and non-nuclear grade anion exchange resins Indion-103 and Indion-870. For iodide ion-isotopic exchange reactions under experimental conditions of 35.0°C, 1.000 g of ion exchange resins and 0.002 M labeled iodide ion solution, the parameters were 0.223 min−1, 0.300 mmol, 0.067 mmol/min and 18.7, respectively, for Indion-103, and those of 0.165 min−1, 0.251 mmol, 0.041 /min and 16.2, respectively, for Indion-870. The similar tendency was observed during bromide ion-isotopic exchange reactions. The results suggest that Indion-103 shows greater performance than Indion-870 resin under similar experimental conditions.
      PubDate: 2014-03-01
       
  • On the thermodynamic theory of the strength of solids: 4. Capillary
           condensation and capillary evaporation in wedge-shaped crack
    • Abstract: Abstract The processes of capillary condensation and capillary evaporation in a wedge-shaped crack are considered. Capillary evaporation is a comparatively new phenomenon that is opposite to capillary condensation and occurs upon the cleavage of a solid in a nonwetting liquid. For both cases, the positions of a meniscus inside a wedge-shaped crack have been calculated as functions of the meniscus curvature radius, liquid-contact angle, and crack-opening angle. The effect of temperature on the meniscus position has been analyzed; it has been established that the meniscus shifts from the gaseous toward the liquid phase as temperature rises. The regularities of meniscus displacements in the course of crack growth have been established: under the conformal mechanism of crack growth, the absolute position of the meniscus remains unchanged (i.e., the meniscus and the crack frontal line move at the same velocity), while, under the depth mechanism of growth, the relative position of the meniscus is retained.
      PubDate: 2014-03-01
       
  • Thermodynamic characteristics of ion-exchange sorption of Co       class="a-plus-plus">2+ cations on Na-vermiculite
    • Abstract: Abstract The exchange of Na+ ions of vermiculite for Co2+ cations is measured by sorption-analytical and microcalorimetric methods. The previously revealed growth of the equilibrium constant with a rise in the degree of filling θ of vermiculite exchange sites with Co2+ cations is confirmed. This result is explained by the segregation of Co2+ and Na+ cations being exchanged in separate interlayer regions of vermiculite. The negative heats of exchange of Na+ cations for Co2+ cations are associated with the energy consumption for the rearrangement of the segregated interlayer regions in vermiculite. The positive entropy changes resulting from the exchange indicate the formation of a more disordered Co-Na-layered “cake” in comparison with the initial Na-form vermiculite. A decrease in the integral molal free-energy change ΔG m of the mixed form of the mineral is determined by the entropy factor. It is shown that, as θ increases, the ΔG m(θ) dependence passes from a positive to a negative range of values. This pattern of the curve may be interpreted as a gradual phase transition from the Na-form to the mixed Co-Na-segregated form. The first derivatives of the enthalpy and entropy changes with respect to the degree of filling θ exhibit distinct maxima at θ ∼ 0.20 as a result of the transition from the ideal mixing of Co2+ and Na+ cations being exchanged to their segregation.
      PubDate: 2014-03-01
       
  • The wonderful world of micelles
    • Abstract: Abstract This review is focused on the most unique and paradoxical properties of micelles, which require special consideration. Six properties have been noted. (1) Micelle formation in the absence of attraction between monomers. Under the action of the hydrophobic effect, ionic micelles can be formed even in the presence of repulsion between similarly charged ions. (2) Despite small sizes, micelles are not nuclei of any phase and have no macroscopic analogs. (3) Solid-liquid duality. Micelles are liquidlike in the tangential direction and solidlike in the normal (radial) direction. This rigidity is sufficient for the development of polymorphism. (4) The suddenness of micelle formation and instantaneous emergence of large molecular aggregates. The quasi-chemical and phase approaches explain the abrupt transition through the mass action law by large aggregation numbers and the possible existence of a metastable state during the microphase transition, respectively. (5) Abnormal solubility. Micelles do not obey the Kelvin equation and exhibit symbate variations in sizes and solubility. The paradox can be solved using the theory of aggregative equilibrium. (6) When an ionic surfactant is added to a micellar solution, the concentration of one of its ions decreases. This postulate can be strictly proved based on combined consideration of the electrical neutrality condition and the mass action law.
      PubDate: 2014-03-01
       
  • Effect of supramolecular interactions with cationic surfactants on
           adsorption of flavonoids on highly dispersed silica surface
    • Abstract: Abstract The effect of the cationic surfactants decamethoxine and miramistin on the physicochemical properties of the natural flavonoids quercetin and rutin is studied spectrophotometrically in the range of physiological pH values. It is established that the interaction with these cationic surfactants changes the spectral characteristics of the flavonoids in solutions and essentially increases their adsorption on the surface of highly dispersed silica as compared with their aqueous solutions. It is shown that the efficiency of flavonoid adsorption from decamethoxine and miramistin solutions is governed by solution pH, flavonoid hydrophobicity, and the nature of a cationic surfactant.
      PubDate: 2014-03-01
       
  • The rheological properties of gelatin gels containing κ-carrageenan.
           The role of polysaccharide
    • Abstract: Abstract The influence of an anionic polysaccharide, κ-carrageenan, on the rheological properties of low-concentration (1.0 wt %) gelatin gels has been studied in a wide range of low polysaccharide concentrations (1 × 10−3–5 × 10−1 wt %) at a temperature of 14.0°C and pH values slightly higher than the isoelectric point of gelatin. The parameters characterizing the rheological properties of the gels are governed by the mass ratio between the polysaccharide and gelatin, which are able to form (bio)polyelectrolyte complexes in aqueous systems. There is a critical κ-carrageenan-to-gelatin mass ratio Z ≅ 0.1, above which the yield stress of the gels and their effective viscosit at stresses exceeding the yield point drastically rise. The increase in these rheological parameters correlates with a growth in the particle size of κ-carrageenan-gelatin polyelectrolyte complexes, which are formed in the aqueous bulk phase at an elevated temperature and precede gelation.
      PubDate: 2014-03-01
       
  • Shape of the particles produced by seeded dispersion polymerization of
           styrene
    • Abstract: Abstract In this work, seeded dispersion polymerization of styrene was carried out in the presence of various types of seed particles. We found that in the case of polystyrene and poly(methyl methacrylate) seeds, the shape of the resulting particles remained spherical. For styrene/poly(nbutyl methacrylate) (PnBMA) and styrene/poly(lauryl methacrylate) seeding particles, raspberry like particles were produced along with those of occluded morphology. We studied the effects of various polymerization factors such as concentrations of a stabilizer, an initiator, and a monomer, a weight ratio of methanol to water, a type of initiator, weight ratio of styrene to Pn-BMA seed particles, and polymerization temperature on the formation of these raspberry-like particles. The experimental results showed that the increase of concentrations of the initiator and the stabilizer as well as that of methanol favors the formation of such particles by increasing their surface roughness. An increase of the temperature of polymerization had the same effect on the morphology of resulting product. We hypothesized that the nucleation and growth of specifically fine-structured polystyrene domains on the surface of the Pn-BMA particles guides the formation of non-linear morphology during seeded polymerization in colloidal solution.
      PubDate: 2014-01-01
       
  • Aggregation behaviour and thermodynamics of mixed micellization of
           1-hexadecylpyridinium bromide and ionic liquid in ethylene glycol/water
           binary mixtures
    • Abstract: Abstract Micellar behavior of binary combinations of ionic liquid, 1-tetradecyl-3-methylimidazolium bromide, with conventional cationic surfactant 1-hexadecylpyridinium bromide was investigated by means of conductometry to study the effect of cosolvent and water content and temperature. The critical micelle concentration and the degree of counterion association were calculated from the conductometry data. Thermodynamic parameters were obtained from the temperature dependence of the critical micelle concentration. The standard Gibbs energy of micellization increased with the increasing percentage of cosolvent as well as the mole fraction of C14mimBr. The standard enthalpy and standard entropy of micelle formation were both decreased with the increasing temperature and the concentration of cosolvent. The entropy contribution was larger than the enthalpic one in pure water, whereas in the ethylene glycol/H2O mixture the enthalpy contribution was predominant
      PubDate: 2014-01-01
       
  • Simulation of electrical-conduction and filtration processes in porous
           media with two-phase saturation
    • Abstract: Abstract Results of simulating electrical-conduction and filtration processes in porous media with two-phase saturation have been presented. A three-dimensional cubic lattice of capillaries has been used as a model porous medium. The sizes and amount of capillaries in the model are selected according to a preset pore-size distribution. The results obtained enable one to establish the general regularities of the influence of the pore structure on transfer processes at two-phase saturation, analyze the dependence of the electrical-conduction and filtration processes on the features of porous-medium saturation, and illustrate the potential of the capillary-lattice model for describing the properties of porous media with two-phase saturation.
      PubDate: 2014-01-01
       
  • SiO2-based nanocontainers of a
           novel type: If the template micelles are functional, why remove them
    • Abstract: Abstract A new method is proposed for creating containers based on mesoporous silica nanoparticles for diverse amphiphilic compounds. The method is based on the use of the micelles of required functional compound (i.e., the compound that is subsequently loaded into the containers) as a template when synthesizing nanoparticles. The prospects and advantages of this approach are exemplified by the synthesis of SiO2 particles using the micelles of cetyltrimethylammonium bromide (which can be used as an inhibitor of hydrogen sulfide corrosion) as a template.
      PubDate: 2014-01-01
       
  • Simulation of electrical-conduction and filtration processes in porous
           media
    • Abstract: Abstract Results of simulation of electrical-conduction and filtration processes in porous media have been reported. For better visualization and simplification of the analysis of the results obtained, simple model distributions of pore sizes with the patterns of a triangle, rectangle, semiellipse, etc., have been used. The porous medium has been simulated in terms of a capillary lattice model, which represents a three dimensional cubic lattice of capillaries the sizes and number of which are selected according to a preset pore size distribution. The data obtained reflect the general regularities of the influence of the pore structure on the transfer processes, show the interrelation between the parameters characterizing these processes, and illustrate the potential of the capillary-lattice model for describing the properties of porous media.
      PubDate: 2014-01-01
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2014