Colloid Journal最新文献

{"title":"Micelle-Forming and Antimicrobial Properties of a Series of Bis-Quaternized Ammonium Compounds Based on DABCO Derivatives","authors":"Z. M. Shaihutdinova,&nbsp;A. S. Sapunova,&nbsp;D. V. Salakhieva,&nbsp;T. N. Pashirova,&nbsp;A. D. Voloshina,&nbsp;A. V. Bogdanov","doi":"10.1134/S1061933X25600010","DOIUrl":"10.1134/S1061933X25600010","url":null,"abstract":"<p>A set of methods (tensiometry, conductometry, dynamic light scattering, spectroscopy, and fluorimetry) has been employed to study the self-assembly of long-chain bis-quaternized hydroxyethyl group-containing derivatives of 1,4-diazabicyclo[2.2.2]octane. The critical micelle concentrations, adsorption characteristics of the air–water interface, solubilization capacities with respect to poorly water-soluble OrangeOT dye, aggregation numbers, and sizes of aggregates have been determined. The influence of the structure (alkyl chain length and head group charge) of the studied compounds on their micelle-forming and antimicrobial properties, as well as hemolytic activity, has been determined.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"246 - 254"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature-Regulated Wettability of Conductive Films Based on Electrophoretic Silver Nanoparticle Concentrates","authors":"S. I. Babashova,&nbsp;V. V. Bocharov,&nbsp;V. S. Sulyaeva,&nbsp;E. A. Maksimovskiy,&nbsp;A. N. Kolodin,&nbsp;A. I. Bulavchenko","doi":"10.1134/S1061933X24601409","DOIUrl":"10.1134/S1061933X24601409","url":null,"abstract":"<p>Uniform rough films containing up to 73 at % silver have been obtained by the Doctor Blade method from concentrated silver nanoparticle organosols stabilized with sodium bis(2-ethylhexyl) sulfosuccinate. Variations in the wettability of the films have been studied in detail as depending on the conditions of their heat treatment within a temperature range of 50–500°C. The temperature dependence of the contact angles is not monotonic and implies the transition from superhydrophilic to weakly hydrophilic systems due to the processes of sintering of nanoparticles and thermal decomposition of the stabilizer. It has been experimentally shown that a transition from nonconductive to conductive coatings (from 500 to 105 mΩ/sq) is accompanied by a drastic increase in the contact angle (from 25 to 78°).</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"173 - 183"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Electrostatic Interaction of Dielectric Particles in an Electrolyte Solution under the Strong Screening Regime","authors":"S. I. Grashchenkov","doi":"10.1134/S1061933X25600046","DOIUrl":"10.1134/S1061933X25600046","url":null,"abstract":"<p>The electrostatic interaction between two identical charged dielectric spherical particles in a symmetric electrolyte solution has been studied on the basis of the Poisson–Boltzmann equation. Particular attention has been focused on the case of high surface potentials of the particles, whose radii are significantly larger than the Debye radius. Using the finite element method, the interaction forces between the particles have been calculated under the conditions of a uniform charge distribution on their surfaces and the absence of an external electric field. It has been shown that allowance for the nonlinearity of the Poisson–Boltzmann equation may be necessary even when the surface potentials of the particles are rather low and the formal application of the linearized Poisson–Boltzmann equation may be employed. The results obtained can be useful for understanding the processes that occur in colloidal systems and analyzing experimental data on the interaction of micron-sized particles in electrolyte solutions.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"184 - 191"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Continuous Phase Properties and Homogenization Conditions on Water Droplet Size Distribution in Water/Crude Oil Emulsions","authors":"F. A. Jassim,&nbsp;S. T. Najim","doi":"10.1134/S1061933X24600994","DOIUrl":"10.1134/S1061933X24600994","url":null,"abstract":"<p>This study investigates the impact of homogenization parameters and the properties of the continuous phase of crude oils on the droplet size distribution, stability, and viscosity of emulsions composing it. Understanding these relationships is essential for enhancing the preparation and processing of several emulsion-based products, such as food, cosmetics, and pharmaceutical items. To achieve results, the study employed a measured experimental design to examine the effects of homogenization at speed (3000–12 000 rpm) in (3–9 min) on emulsions prepared of various continuous phases of crude oil. The droplet size distribution and viscosity of the crude oil emulsions were carefully measured and analyzed. Key findings demonstrate that increasing homogenization speed and time resulted in smaller droplet sizes and an increase in emulsion stability. Moreover, the continuous phase viscosity of crude oil affects both the droplet size and the viscosity of crude oil emulsion causing the larger droplets and higher emulsion viscosities due to an increase in continuous phase viscosity. Additionally, the study shows that the emulsion viscosity continuously increases over time (aging), indicating that it is suitable for long-term stability. The novelty of this work lies in its comprehensive exploration of the interconnected effects of homogenization parameters and continuous phase properties on emulsion characteristics. By providing insights into these relationships, the study contributes to a deeper understanding of emulsion behavior and offers valuable guidance for the development and optimization of emulsion-based products.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"289 - 301"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sorption of Neutral Red Dye by Enterosorbent Polysorb MP from AOT Microemulsion in n-Decane","authors":"M. G. Demidova,&nbsp;T. Yu. Podlipskaya,&nbsp;N. O. Shaparenko,&nbsp;M. K. Barakina,&nbsp;V. V. Tatarchuk,&nbsp;A. I. Bulavchenko","doi":"10.1134/S1061933X24601392","DOIUrl":"10.1134/S1061933X24601392","url":null,"abstract":"<p>Neutral cationic red dye has been sorbed by Polysorb MP from a 0.25 mol/L AOT microemulsion in <i>n</i>-decane at different contents of the aqueous pseudophase. The maximum sorption capacity of the sorbent in the microemulsion is an order of magnitude higher than that in the water phase and amounts to 55 mg/g. A drastic drop in the degree of extraction upon increasing water content in the microemulsion from 1 to 8 vol % and the reversibility of the sorption processes have been revealed. Anionic dyes are not extracted by Polysorb in the same systems. As the water content increases, the zeta-potential of SiO₂ particles decreases from 18 to 1 mV. On the basis of the obtained dependencies, a cation-exchange mechanism has been proposed for the sorption from the microemulsion, with this mechanism involving the exchange of sodium and neutral red dye cations between micelles adsorbed on the surface of particles and micelles contained in the bulk of the microemulsion.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"192 - 200"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Simulation of an Electroosmotically-Induced Micromixer with Identical Circular Barriers Using Electrokinetic Effects","authors":"Elnaz Poorreza","doi":"10.1134/S1061933X24601380","DOIUrl":"10.1134/S1061933X24601380","url":null,"abstract":"<p>Micromixers represent microchannel devices that promote effective fluid integration within a constrained spatial domain and a specified flow pathway. The mechanism of induced-charge electroosmosis has garnered substantial attention from the microfluidics scholarly community over the past decade. In this study, an electroosmotically actuated micromixer amalgamates two disparate fluids that enter through individual inlets into a unified channel measuring 15 μm in width and 80 μm in length, respectively. A sinusoidal electric potential, with a peak value of 0.1 V at a frequency of 8 Hz, is applied across the electrodes. To enhance the operational efficacy of the micromixer, 45 uniform circular barriers are integrated within the microchannel. According to the simulation outcomes, the micromixer attains an exemplary mixing efficiency nearing 0.97 and exhibits promising potential applications across a diverse array of fields, including biochemistry and biomedical sciences.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"315 - 326"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control of Self-Organization of Thiacalix[4]Crown-Ethers in Cone and 1,3-Alternate Forms in Nanofilms on Quartz Substrate","authors":"I. D. Chetinel,&nbsp;A. A. Botnar,&nbsp;A. S. Novikov,&nbsp;E. A. Muraveva,&nbsp;A. T. S. Ireddy,&nbsp;P. S. Zun,&nbsp;S. E. Solovieva,&nbsp;I. S. Antipin,&nbsp;E. V. Skorb,&nbsp;A. A. Muravev","doi":"10.1134/S1061933X25600083","DOIUrl":"10.1134/S1061933X25600083","url":null,"abstract":"<p>Morphological characteristics of the nanolayers of amphiphilic <i>tert</i>-butylthiacalix[4]crown-4-ether in <i>cone</i> stereoisomeric form <b>1</b> and bolaamphiphilic nitrothiacalix[4]biscrown-5-ether in <i>1,3-alternate</i> form <b>2</b> deposited onto quartz substrate at varying solvent, temperature, and concentration of compounds are analyzed. Quantum-chemical calculations of the considered calix[4]arenes reveal a favorable micellar aggregation (the packing factor <i>p</i> &lt; 0.3). During AFM visualization of calixarene nanolayers prepared through evaporation of solvent on substrate, spherical associates that are 200–800 nm in size are detected for compound <b>1</b>, which enlarge with a decrease in the concentration of compound and an increase in solvent polarity and environmental temperature. At the same time, the dispersity of the sizes of associates increases with a decrease in temperature, but has a mixed dependence on solvent and concentration. The most uniform size distribution of spherical particles is achieved upon Langmuir monolayer formation at the air–water interface upon deposition of the solution of compound <b>1</b> in 10^–5 M solution in chloroform onto water subphase and upon vertical transfer onto substrate. In the case of bolaamphiphile <b>2</b>, spherical associates are formed at <i>t</i> = 23°C in 10^–5 М solution in toluene and at 4°С in 10^–4 М solution in chloroform, while under other combinations of conditions, the nanofilm is represented by thread-like structures (at 23°С) and tactoid aggregates (at 4°С). Dynamic light scattering study of the solutions of amphiphile <b>1</b> in chloroform allows to detect spherical aggregates (particle size is 202 ± 92 nm), which indicates the decisive role of solvent in the formation of spherical aggregates in nanolayers, while in other cases the supramolecular organization of calixarenes is presumably affected by the interaction with substrate.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"236 - 245"},"PeriodicalIF":1.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generation of Latex Particles and Phase Formation in a Heterogeneous Static Monomer–Water System","authors":"A. A. Hovhannisyan,&nbsp;G. K. Grigoryan,&nbsp;A. G. Nadaryan,&nbsp;N. H. Grigoryan","doi":"10.1134/S1061933X24601215","DOIUrl":"10.1134/S1061933X24601215","url":null,"abstract":"<p>The aim of this work is to find new ways to synthesize latexes (polymer suspensions) with a given size and surface structure of particles. The need for such latexes is not large-scale, but their development and production are extremely important for the development of high technologies. Monodisperse latexes are especially valuable in immunological diagnostics of a wide range of diseases. The article presents the results of studies of the nucleation of latex particles in a heterogeneous monomer−water system. The results of these studies made it possible to find conditions for the reproducible synthesis of monodisperse polystyrene latexes. In order to change the surface structure of latex particles, cetyl alcohol was dissolved in the initial monomer phase (styrene). The article presents the results of electron microscopic studies of the synthesized latexes. Nano crystals of this alcohol are clearly visible on the surface of the latex particles. It is suggested that, in deep monomer conversions, the process of crystallization of cetyl alcohol begins in polymer-monomer particles.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"49 - 53"},"PeriodicalIF":1.4,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Conditions for Obtaining Detonation Nanodiamond on Surface Composition and Stability of Its Aqueous Sols","authors":"A. V. Volkova,&nbsp;D. A. Savelev,&nbsp;N. S. Chuikov,&nbsp;V. A. Vodolazhskii,&nbsp;L. E. Ermakova","doi":"10.1134/S1061933X2460129X","DOIUrl":"10.1134/S1061933X2460129X","url":null,"abstract":"<p>This work is devoted to studying the effect of an additional treatment of detonation nanodiamond (DND) powder of basic purification on the surface composition of DND particles, as well as their electrokinetic properties and aggregate stability in solutions of an indifferent electrolyte (NaCl) within a wide pH range. It has been found that an increase in the degree of purification and the number of protonated carboxyl groups on the surface of DND particles due to additional acidic and thermoammonia treatments leads to a shift in the position of the isoelectric point (IEP) from pH 7.0 for an initial sample to pH 6.3 and pH 6.0, respectively. It has been shown that the coagulation thresholds of the hydrosols at natural pH and the positions of stability zones in a 10^–3 M sodium chloride solution are in complete compliance with the IEP values. The highest thresholds values at pH 5.8 are observed for the initial DND, while, for the dispersion of DND particles subjected to the thermoammonia treatment, the fast coagulation occurs already at a concentration of 10^–4 M. It has also been found that the aggregate stability zones for additionally treated DND samples almost coincide with each other. For DND of basic purification, the stability zone expands in the region of positive zeta-potentials, while, in the region of negative values, no stability is observed, probably, due to the partial dissolution of surface impurities at high pH values and the transfer of their ionic forms to the solution, which causes coagulation of the DND particles.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"1 - 14"},"PeriodicalIF":1.4,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of Bulk Nanobubbles with a Hydrate Layer","authors":"Yu. K. Levin","doi":"10.1134/S1061933X24601276","DOIUrl":"10.1134/S1061933X24601276","url":null,"abstract":"<p>The stabilization of bulk nanobubbles with a balance at their boundary of the Laplace pressure due to surface tension and electrostatic pressure due to Coulomb forces is considered. The presence of a hydrate layer of thickness ~1 nm with a tangential orientation of water dipoles around it is taken into account, the low permittivity of which, approximately equal to 3, increases the pressure at the boundary of the nanobubble. The dimensions and charge of a stable nanobubble are determined. It is shown that in salt water, the hydrate layer, regardless of the charge of the nanobubble, increases the pressure at its boundary by almost 30 times, and in fresh water—from 10 to 4 times.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"32 - 37"},"PeriodicalIF":1.4,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}