An Erratum to this paper has been published: https://doi.org/10.1134/S1061933X21330012

An Erratum to this paper has been published: https://doi.org/10.1134/S1061933X21330024

Abstract The spontaneous growth of sessile air bubbles with sizes of 1 mm and below on a solid surface has been experimentally studied in ethanol and its aqueous solutions under constant external conditions (atmospheric pressure and a temperature of 20°С). A noticeable growth of bubble volume has been observed for at least 2 h in ethanol solutions beginning from an alcohol concentration of 50%. The

Abstract The frequency dispersion has been studied for the dynamic viscosity coefficients determined on the basis of both the Smoluchowski equation, which describes the diffusion relaxation mechanism, and the Bhatnagar–Gross–Krook approximation, which leads to an exponential damping of the stress tensor in magnetic fluids. In the former case, the Green function, which enters into the integral parts

Abstract Time dependent magnetohydrodynamic flow of viscous incompressible CuO/Al2O3/TiO2 water based nanofluid along a vertical permeable stretching surface in the presence of external magnetic field, thermal radiation and viscous dissipation is investigated. Apart from these effects, it is assumed that the surface is saturated in porous medium. Mathematical formulation of the problem is highly nonlinear

Abstract A model has been proposed for gas transfer through a composite polymer membrane taking into account the influence of adsorption kinetics on the surfaces of a selective layer. An analytical expression has been obtained that describes the gas transfer with regard to a finite adsorption rate and is consistent with the corresponding experimental data on gas permeability. It has been shown that

Abstract The effect of various surfactants on aggregation of fullerene C60 is discussed. Formation of ordered structures via C60-surfactant interactions at a specific [C60]/[Triton X-100] concentration ratio in the aqueous phase is reported. The aqueous phase nanoarchitectures were composed of rod-like assemblies of nanoscale dimensions at specific [C60]/[Triton X-100] ratio of 1.7 × 10–3 : 1. Transmission

Abstract This work is devoted to studying the structural and morphological properties of a silver colloidal solution obtained by the method of electrical-spark discharge in distilled water. Silver nanoparticles are formed as a result of metal sputtering from the surfaces of silver electrodes, between which a high-voltage electric discharge is generated. The solution is stabilized by forming a layer

Abstract A thermodynamic model has been formulated for the formation work of a molecular aggregate consisting of molecules of a nonionic surfactant and a solubilisate in a hydrocarbon–surfactant–water solution as a function of temperature, concentrations of the surfactant and hydrocarbon in the solution, and aggregation numbers of the surfactant and hydrocarbon in the aggregate. The model depends on

Abstract It is known that highly charged droplets formed in the course of electrospraying disintegrate into a number of smaller droplets. The criteria for the instability and disintegration of conducting liquid droplets in the course of electrospraying have been considered in this article. Some forms of the perturbation of a spherical liquid droplet have been shown for the case when the Rayleigh stability

Abstract The structural (structural resistance coefficient, volume porosity, tortuosity coefficient, filtration coefficient, and specific surface area) and electrokinetic (specific electrical conductivity, streaming potential, and electrophoretic mobility of particles) characteristics of micro- and macroporous glasses prepared from sodium borosilicate two-phase glass have been studied in nickel chloride

Abstract— Adsorption of deoxyribonucleic acid on the surfaces of nanosized titanium and cerium dioxides from aqueous solutions has been studied as depending on pH and adsorbate concentration. The comparison of the data on the adsorption of DNA, an inorganic phosphate, and nucleotides that compose nucleic acid molecules, as well as the states of the surface functional groups of the metal oxides, has

Abstract Protomicelle is a new term in colloid science that refers to micelle-like surfactant aggregates in solutions. Unlike conventional micelles, protomicelles have no critical micelle concentration (CMC) and are formed gradually via adsorption of surfactant molecules or ions on solubilization cores at concentrations significantly lower than the CMC. A completely formed protomicelle looks like an

Abstract The Irving–Kirkwood stress tensor has been calculated in a spherical slit inside an amorphous solid, with the slit simulating an adsorbate-containing spherical pore in an adsorbent. Both normal and tangential components of the stress tensor have been calculated. Although their local variations are similar, the normal component is about two times higher than the tangential one. At a preset

Abstract All-atom molecular dynamics has been employed to study the processes of self-aggregation and solubilization in aqueous solutions that contain decane, ionic and nonionic surfactants, and additives of salts. In particular, micellization of an anionic surfactant (sodium dodecyl sulfate) in an aqueous solution has been simulated in the presence of a hydrocarbon (decane) at preset temperature and

Abstract An empirical expression based on the general notions of available structural and diffusion theories of viscous flows has been proposed for the viscosity coefficients of molecular liquids. The proposed expression determines the relation between the viscosity coefficient, self-diffusion coefficient, surface tension coefficient, and steric parameter of liquid molecules. The validity of the proposed

Abstract The article is devoted to studying the synthesis of brominated nanodiamond and its reactivity with respect to N-nucleophiles (an antituberculous drug, isoniazid, and 2,4-dinitrophenylhydrazine). It has been shown that brominated surface of nanodiamond can be easily obtained by treating hydrogenated surface with bromine under heating and illumination with visible light. The work has resulted

Abstract Grand canonical Monte Carlo simulations were performed to study the occupancy of structure I multicomponent gas hydrates by CO2/CH4, CO2/N2, and N2/CH4 binary gas mixtures with various compositions at a temperature of 270 K and pressures up to 70 atm. The presence of nitrogen in the gas mixture allows for an increase of both the hydrate framework selectivity to CO2 and the amount of carbon

Abstract The chemical composition, structure, and electrokinetic characteristics have been studied for different vitreous materials, including basic silicate glasses and those modified with iron and nickel oxides in the course of melting. The position of the isoelectric point and the value of the electrokinetic potential of monolithic particles (two-phase glasses and quartz-like glasses) and microporous

Abstract The influence of gravity on the deposition of high-density submicron aerosol particles in fibrous filters from vertical and horizontal (relative to the gravity vector direction) gas flows has been studied at small Reynolds numbers, \(\operatorname{Re} \ll 1.\) Numerical solutions of the Stokes equation and the equation for convective diffusion have been employed to calculate the efficiency

Abstract A composite aerogel with superhydrophobic external surface has been synthesized from reduced graphene oxide and polytetrafluoroethylene taken in a weight ratio of 1 : 1. The porous structure of the aerogel has been studied by the standard contact porosimetry method (SCPM). The porosimetric curves measured with respect to octane and water intersect in the region of small pores, thereby leading

Abstract Transport numbers of sodium, nickel, and lanthanum counterions have been studied in microporous (average pore radius is r = 2–3.4 nm) and macroporous (r = 16–27 nm) magnetite-free glasses and those containing magnetite in their matrices. It has been found that, in the case of microporous glasses, the relation between the transport numbers of the studied cations is primarily governed by the

Abstract Protomicelles represent a new concept of colloid science relevant to micelle-like aggregates of surfactants in solutions. In contrast to ordinary micelles, their formation requires no critical micelle concentration (CMC) and proceeds gradually through the adsorption of surfactant molecules or ions on a solubilization core at concentrations much lower than the CMC. A completely formed protomicelle

Abstract Magnetite particles are prepared from a mixed aqueous solution of FeCl2 and FeCl3, and magnetite−bentonite composite particles are obtained from a mixed dispersion of magnetite and bentonite by precipitation with ammonia. The dispersions are examined by the X-ray diffraction, transmission electron microscopy, IR spectroscopy, dynamic light scattering, and electrophoresis methods. In the presence

Abstract Molecular dynamics simulation has been employed to study conformational rearrangements induced by an external field in uniformly charged polypeptides adsorbed on the surface of an oppositely charged gold nanoparticle, whose polarization direction varies with a frequency corresponding to the microwave electric field. The averaged angular and radial distributions of atom densities have been

Abstract The possibility of calculating the ionic composition of a membrane and the ion-exchange equilibrium constant on the basis of the concentration dependences of the specific conductivity of the membrane in individual and mixed solutions has been studied for an ion-exchange membrane–solution system, in which the solution contains two types of counterions and a common coion. The calculation has

Abstract Metal nanoparticles with plasmonic properties have gained significant attention due to their unique physical, chemical and antimicrobial properties. Among different metal nanoparticles, copper nanoparticles (CNPs) are especially important because of their antimicrobial activities against multidrug resistant strains. Synthesis of stable CNPs in feasible amounts remains a challenge due to the

Abstract Electrodiffusion coefficient and diffusion permeability of an ion-exchange membrane have been calculated as the kinetic coefficients of the Onsager matrix in terms of the thermodynamics of nonequilibrium processes and on the basis of the cell model proposed previously by the author for charged membranes. The membrane is assumed to consist of an ordered set of spherical porous charged particles

Abstract Evaporation of droplets of water–ethanol solutions with different concentrations has been experimentally studied at different relative humidities of ambient air. High-speed micrography has been employed to monitor the dynamics of variations in the sizes of the evaporating droplets. It has been found that relative humidity of the ambient air significantly affects variations in the diameters

Abstract The deposition of aerosol particles in a filter composed of fibers coated with highly porous layers of radially oriented needles and the deposition of needle-coated particles onto smooth fibers have been studied. The Stokes flow fields in a model row of parallel fibers and near an individual needle-coated spherical particle have been calculated. A correction to the Stokes force for the drag

Abstract It has been experimentally revealed that a quasi-liquid film that exists on the surface of dispersed ice particles and exhibits dissolving properties disappears after a long-term exposure of samples at a temperature close to –40°C and arises again at –2, –5, and –10°C. The energy of the film formation has been determined. The high value of this energy (approximately 210 kJ/mol) indicates a

Abstract Deformation of amorphous glassy poly(ethylene terephthalate) (PET) films in liquid adsorption-active media (AAMs) by the crazing mechanism has been studied. The crazing has been shown to be an efficient method for the formation of a finely dispersed mesoporous structure in the polymer. A technique has been developed for stabilizing the structure of crazed PET by its annealing in the presence

Abstract It has been shown that adsorption of 3-phenylpropenic (cinnamic), 3-(4-hydroxyphenyl)propenic (coumaric), and 3-(3-methoxy-4-hydroxyphenyl)propenic (ferulic) acids on the surface of highly dispersed alumina is characterized by L-type isotherms according to the Giles classification. The maximum adsorption values (~3.3 × 10–4 mol/g), as well as dissociation constants (pKCOOH = 4.5 ± 0.1), are

Abstract It has been shown that the laser optico-acoustic method can be used to study time variations in the light extinction coefficient of magnetic fluids. Diluted aqueous magnetic fluids with different concentrations of magnetite particles have been used as the objects of investigation. The dependence of the time shape of the leading edge of the optico-acoustic signal excited in an examined fluid

Abstract The contemporary state of the art has been considered in the field of liquid-crystalline graphene oxide dispersions. The production methods, structure, and main properties of graphene oxide have been described. The main graphene oxide mesophases and their physicochemical properties have been discussed. The physical properties of graphene oxide dispersions (in particular, their rheological

Abstract Solubilization of crown-substituted magnesium phthalocyaninate(I) has been studied by spectrophotometry in aqueous solutions of tetradecyltrimethylammonium(II), hexadecyltrimethylammonium(III), and hexadecyltriphenylphosphonium bromides. The experiments have been carried out with saturated solutions of I occurring at the thermodynamic equilibrium with its precipitate. The experimental data

Abstract Specific features of the interaction between magnetic emulsions and an alternating magnetic field have been studied. The emulsions are represented by a system of microdroplets of hydrocarbon-based magnetic fluids suspended in an oil medium immiscible with them. It has been shown that an alternating magnetic field can be employed to form different structural lattices in such media. The type

Abstract The influence of a pancreatic enzyme, lipase, on doxorubicin-loaded anionic liposomes, their complexes with spherical polycationic brushes, and ternary complexes with brushes and bovine serum albumin has been studied. The two-stage kinetics of the enzyme-induced disturbance of liposomal membrane integrity has been investigated using fluorescence spectroscopy. A 120-min induction period free

Abstract Particles of natural hydrothermal nanosilica have been characterized, and the conditions of their self-organization have been chosen for the stabilization of oil-in-water emulsions with the use of a cationic surfactant. Microcapsules, which consist of shells composed of layer-by-layer deposited chitosan and calcium alginate and contain dodecane, soybean and sesame oils, a 30% α-tocopherol

Abstract Adsorption of some catecholamines from aqueous solutions on a titanium dioxide surface has been studied as depending on pH and sorbent concentration. The experimental data have been interpreted in terms of the surface complexation theory. Stability constants have been calculated for the inner-sphere covalent complexes resulting from the interaction of hydroxyl groups of catecholamines with

Abstract A thermodynamic theory has been formulated to substantiate a number of new phenomena experimentally revealed in the colloid science of surfactants. A description has been given for the formation of particular micelles via surfactant adsorption on their cores, the role of which is played by monomers and dimers of phthalocyanines. This gives rise to the formation of surfactant micelles and protomicelles

Abstract— The pendant drop shape and oscillating pendant drop methods have been employed to study the surface tension and the dilatational rheological surface characteristics at the solution–air interface for aqueous solutions of dicationic imidazolium surfactants with extremely short bridge fragments. A high surface activity has been revealed for these surfactants. High values of the dilatational

Abstract The classical density functional theory makes it possible to explicitly calculate the local density profiles, the components of the pressure tensor, and the thicknesses of thin interlayers between a lyophilic or lyophobic solid surface and, accordingly, gas or liquid phases at different values of the chemical potentials of the phases. Within the framework of a unified approach based on the

Abstract The present work reports synthesis of titanium dioxide (TiO2) thin films deposited from ethanolic titanium diisopropoxide bis-acetyl acetonate precursor solution by using spray pyrolysis technique. The deposition of films were carried out on both amorphous and fluorine doped tin oxide (F:SnO2) glasses. The effect of film thickness on photoelectrochemical, structural, morphological and optical

Abstract Experimental data have been presented on the evaporation rate of suspended droplets of both pure water and water containing ≈1.5 wt % surfactant, sodium dodecyl sulfate. Evaporation occurs in a convective flow of dry air, with its velocity and temperature being varied within ranges of U0 = 1–5 m/s and T0 = 20–80°C, respectively. The density of the mass flux from the surface of the surfactant-containing

Abstract This review is dedicated to the topic of longitudinal rheology, a branch of rheology that is complementary to traditional shear rheology, and yet not as widely explored. Longitudinal rheology differs from typical shear rheology by the type of stress applied. Longitudinal stress is a wave, which causes liquid expansion and compression that occurs when ultrasound propagates through such liquid

Abstract Two approaches to the calculation of the percolation threshold in polymer nanocomposites have been analyzed, namely, the excluded-volume theory and the model proposed by Li and Kim. It has been shown that the former approach yields a rough estimate of the threshold, while the latter one leads to simple relations that can be used, however, with essential corrections. It is necessary, first

Abstract Macroporous viscoelastic poly(vinyl alcohol) (PVA) cryogels are formed via the cryogenic processing (freezing/incubation in the frozen state/defrosting) of concentrated solutions of the polymer. Such materials are of significant scientific and applied interest. This also concerns various complex and composite PVA cryogels containing soluble and insoluble (fillers) additives, respectively.

Abstract Novel multicompartment self-assemblies of triblock copolymer polystyrene–polyisoprene–poly(2-vinylpyridine) (PS-PI-P2VP) for drug delivery are demonstrated. The triblock copolymer assemblies in dilute solutions in a common solvent (tetrahydrofuran) undergo transformations from core-shell-corona micelles to multicompartment micelles by adding P2VP-selective solvent (water). The effects of water

Abstract The thermodynamic theory of solubilization has been formulated with introducing the notion of standard solubilization affinity. An important component of this notion is the Laplace capillary pressure represented in the phase interpretation of the hydrocarbon core of a normal micelle. The partition coefficient of a solubilisate is also interpreted both in terms of a mole fraction within the

Abstract Formation of stable silver dispersions with a unimodal particle size distribution has been studied in aqueous solutions of oligochitosans with different molecular masses. The character of the interaction of oligochitosans with silver ions and nanoparticles has been revealed. Spectral studies have shown that hydroxyl and amino groups of oligochitosans are involved in the formation and stabilization

Abstract Molecular dynamics has been employed to study conformational rearrangements of polyampholytic and uniformly charged polypeptides adsorbed on the surface of a transversely polarized nanowire, in particular, upon rotation of the polarizing electric field vector. On the surface of the transversely polarized nanowire, a fringe consisting of polyampholitic polypeptide macromolecules is protruded

Abstract The published communications devoted to studying the phenomenon of photoinduced hydrophilicity of the surfaces of thin metal oxide films have been reviewed. This phenomenon underlies the capability of photoactive materials for self-cleaning. The novelty of the work consists in the generalization and the critical analysis of the vast information obtained on the problem under consideration beginning

Abstract Interfacial separation of components of extractants based on di-(2-ethylhexyl)phosphoric acid (di-2EHPA) in toluene and a mixture of di-2EHPA with trioctylamine in toluene has been studied in the course of treatment with aqueous sodium hydroxide solutions yielding an organic phase and an aqueous colloidal solution of di-2EHPA sodium salt. Conditions have been found for the isolation of almost

Abstract Oil-in-water emulsions with different internal phase concentrations of Pistacia lentiscus fruit oil (PLFO) were investigated. These emulsions could be useful as a cream for healing wounds after laser skin resurfacing. Microscopic analysis and rheological measurements were employed to assess the effect of PLFO content on the emulsion properties for 24 hours and one year of storage in the refrigerator

Abstract A viscoelastic ferrocolloid has been probed with the use of a weak alternating magnetic field, which causes rotational oscillations of nanoparticles. The rheology of the dispersion medium has been described using Jeffry’s phenomenological scheme, according to which, colloidal particles are assumed to be magnetically rigid. The Langevin equations that describe the Brownian rotational motion

Abstract A spectrophotometric study of the solubilization of crown-substituted magnesium phthalocyaninate (I) has been carried out in an aqueous solution of sodium dodecyl sulfate (II). The experiments have been performed with saturated solutions of I at a thermodynamic equilibrium of a solution with a precipitate of I. The known transition from dimers of I to monomers upon solubilization has been

erratum

Abstract Works devoted to studying the effect of active environments on damageability of surfaces of solid bodies and materials upon contact actions (Rehbinder effect) have been briefly reviewed. A novel procedure, which combines microscratching and electrochemical reduction of an active component on a studied material surface, has been described. This procedure enables one to simulate and study the

Abstract The work is devoted to the application of the Hill method for calculating the chemical potential of a molecule in the one-component homogeneous molecular system within computer simulations. This method is based on the double integration of molecular radial distribution functions, which depend on the additional parameter that controls the strength of interactions between the molecules. The