Colloid Journal最新文献

{"title":"Effect of Electrostatic Interactions in Wormlike Micelles of Surfactants Based on Betaine and Charged Tertiary Amine with the Same Hydrophobic Groups","authors":"W. Hao,&nbsp;V. S. Molchanov,&nbsp;Yu. M. Chesnokov,&nbsp;P. R. Podlesnyi,&nbsp;O. E. Philippova","doi":"10.1134/S1061933X23601373","DOIUrl":"10.1134/S1061933X23601373","url":null,"abstract":"<p>The viscoelastic properties and structure of solutions of mixed wormlike micelles based on a zwitterionic surfactant, oleylamidopropyldimethylcarboxybetaine (OAPB), and positively charged oleylamidopropyldimethylamine (OAPA) have been studied at different ratios between the components. At a small fraction of the cationic surfactant, OAPA, the solution exhibits viscoelastic properties characteristic of semidiluted solutions of entangled wormlike micelles, the presence of which has been confirmed by cryogenic electron microscopy data. It has been found that, as the molar fraction of the charged surfactant increases to 0.1, the viscosity and relaxation time of the solutions decrease by a factor of three, and the values of the storage modulus remain unchanged at short stress action times. The studied surfactants have a similar structure; therefore, when replacing zwitterionic OAPB molecules by positively charged OAPA molecules, the main factor of variations in the properties and structure is the enhancement of the electrostatic repulsion on the micelle surface. It has been shown that this factor leads to a decrease in the average length of micelles and an increase in their number, which have a weak effect on the rheological properties of the system as long as the length of the micelles is larger than the length of the subchains in the network. With an increase in the molar fraction of OAPA from 0.1 to 0.5, the viscosity and relaxation time drop drastically by several orders of magnitude and the viscoelastic response of the solution is lost; i.e., the network is destroyed. This transition from a semidilute solution to a dilute one is explained by a decrease in the length of the wormlike micelles and the formation of spherical ones. Cryogenic electron microscopy images have confirmed the formation of a mixture of long and short wormlike micelles with spherical micelles at an OAPA molar fraction of 0.5.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"306 - 314"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1061933X23601373.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sorption of Radium-226 on Few-Layer Graphene Synthesized under Conditions of Self-Propagating High-Temperature Synthesis","authors":"A. A. Vozniakovskii,&nbsp;A. P. Voznyakovskii,&nbsp;S. V. Kidalov,&nbsp;A. P. Karmanov,&nbsp;N. G. Rachkova,&nbsp;N. D. Podlozhnyuk","doi":"10.1134/S1061933X23601348","DOIUrl":"10.1134/S1061933X23601348","url":null,"abstract":"<p>Human industrial activity is accompanied by the formation of vast volumes of water contaminated with radionuclides, including radium-226, which create serious danger to people. Graphene nanostructures are among the most promising materials for purifying water from radionuclides. This work has been devoted to investigating the efficiency of few-layer graphene synthesized under conditions of self-propagating high-temperature synthesis from cellulose and wastes of the woodworking industry (technical lignin, tree bark) for purifying water from radium-226. The key advantage of the method chosen for synthesis of few-layer graphene is the possibility to synthesize large volumes of the material at an acceptable cost, which is extremely important for industrial applications. It has been found that the synthesized samples of few-layer graphene can efficiently purify water from radium-226 (the degree of sorption is higher than 99%). It has also been shown that the degree of desorption upon repeated washing with water does not exceed 0.5%.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"178 - 184"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885443","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":"Effects of pH and Indifferent Electrolyte Concentration on the Aggregate Stability of Detonation Nanodiamond Hydrosol","authors":"A. V. Volkova,&nbsp;A. A. Beloborodov,&nbsp;V. A. Vodolazhskii,&nbsp;E. V. Golikova,&nbsp;L. E. Ermakova","doi":"10.1134/S1061933X23601282","DOIUrl":"10.1134/S1061933X23601282","url":null,"abstract":"<p>Coagulation of polydisperse detonation nanodiamond (DND) hydrosol containing primary aggregates with a prevailing average size in a range of 20–200 nm has been studied experimentally and theoretically within the framework of the classical and extended DLVO theory as depending on the concentrations of an indifferent electrolyte (NaCl) and potential-determining ions (pH). It has been shown that the surface of DND particles is charged due to the ionization of ionogenic amphoteric hydroxyl and acidic carboxyl groups located on it. The isoelectric point of the detonation nanodiamond particles has been found to correspond to pH 7.5. It has been revealed that the main stabilizing factor of the DND hydrosol is electrostatic. It has been shown that the stability and coagulation of the sol can be described within the framework of the extended DLVO theory using the effective Hamaker constant for primary porous aggregates and taking into account the initial polydispersity of the DND particles.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"185 - 207"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885449","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":"Features of Polyimide Films with Molecular Imprints of Erythrosine and Indigocarmine","authors":"S. A. Khalzova,&nbsp;A. N. Zyablov,&nbsp;A. Yu. Vybornyi","doi":"10.1134/S1061933X24600088","DOIUrl":"10.1134/S1061933X24600088","url":null,"abstract":"<p>Polyimide films with molecular imprints of erythrosine and indigocarmine have been obtained. The structure and morphology of the film surfaces have been studied by scanning probe microscopy and IR spectroscopy. It has been found that the surface roughness of molecularly imprinted polymers (MIPs) increases, while the relief height amounts to 3–4 nm. The removal of template molecules leads to a redistribution of pores over sizes in the polymers with molecular imprints. The adsorption of dyes by MIP films has been carried out under static conditions. The degrees of extraction and the imprinting factors have been calculated for polymers with molecular imprints of the dyes. The high values of these parameters indicate the selectivity of MIPs to the target template molecules.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"297 - 305"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885450","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":"Thermal Ice Melting Performance of Femtosecond Laser Metal Micro-Nano-Structured Surface","authors":"Ziyuan Liu,&nbsp;Qing Ma,&nbsp;Tingsong Zhang,&nbsp;Yujia Dai","doi":"10.1134/S1061933X23601166","DOIUrl":"10.1134/S1061933X23601166","url":null,"abstract":"<p>Improving thermal ice melting efficiency is very important in the practical application of anti-icing surfaces. This work investigated the thermal ice melting performance of micro-nano-structured surfaces fabricated by femtosecond laser. To the best of our knowledge, we found that the micro-nano-structured surfaces significantly improve the ice melting time for the first time. The shortest melting time was on the porous micro-nano-structured surface, about one third of the original surface. Moreover, it was proven that the accelerated ice melting surface had good durability. The research in this paper showed that the micro-nano-structured surfaces are very suitable for the surface that needs to be heated to melt ice, providing essential guidance for the design of the anti-icing surface.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"315 - 322"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600949","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":"Development of a New Biocompatible Colloid System to Improve the Solubility of Celecoxib","authors":"Alireza Salabat,&nbsp; Nesa Ghorbani","doi":"10.1134/S1061933X23601270","DOIUrl":"10.1134/S1061933X23601270","url":null,"abstract":"<p>In this research work, a new biocompatible microemulsion containing castor oil has been formulated to increase the solubility of celecoxib, as a well-known anti-inflammatory drug. In this formulation castor oil has also anti-inflammatory properties. The proposed oil-in-water microemulsion composed of Tween 80 as surfactant, isobutanol as co-surfactant, and castor oil as the oil phase. In the first step, the phase diagrams of the proposed colloid systems with surfactant to co-surfactant mass ratios of 4 : 1 and 2 : 1 were prepared at ambient temperature. Then, using the obtained phase diagrams, the appropriate formulations were selected by combining different percentages of water, oil, surfactant and co-surfactant in the microemulsion region. Some of physico-chemical properties, such as electrical conductivity, density, refractive index, surface tension and particle size of the selected microemulsion formulations have been determined at 298 K. After that, the solubility of celecoxib in the selected formulations was determined and compared with other reported microemulsion formulations. Interesting results from this section indicated that the solubility of celecoxib significantly increased compared to pure water and the previous proposed formulations. The results of this study can be used to provide suitable formulations based on the biocompatible microemulsions for celecoxib in pharmaceutical industry.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"323 - 329"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600950","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":"Symmetric and Asymmetric Supercapacitor Fabrication Based on Green Synthesized NiO Nanoparticles and Graphene","authors":"A. Zemieche,&nbsp;L. Chetibi,&nbsp;D. Hamana,&nbsp;S. Achour,&nbsp;V. D. Noto","doi":"10.1134/S1061933X23600914","DOIUrl":"10.1134/S1061933X23600914","url":null,"abstract":"<p>Nickel oxide nanoparticles (NiO NPs) are synthesized using olive leaf extract (OLE), which contains a range of polyphenols. These polyphenols serve as both reducing and capping agents, stabilizing the nanoparticles. Aqueous nickel acetate is employed as a precursor. Simultaneously, exfoliated graphene (EG) is obtained via electrochemical exfoliation of graphite in aqueous solutions. These materials were employed as electroactive components in supercapacitor applications. Characterization of NiO and EG involved thermogravimetric analysis (TGA), X-ray diffraction (XRD), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), and scanning/transmission electron microscopy (SEM/TEM), alongside Brunauer−Emmett−Teller (BET) analysis, confirming the formation of crystalline NiO NPs with a cubic phase and <i>Fm</i>-3<i>m</i> space group. Micrographs revealed nanoscale dimensions for both NiO and EG with a substantial surface area, as verified by BET analysis. Symmetric (NiO/NiO, EG/EG) and asymmetric (NiO/EG) supercapacitors were fabricated using the doctor blade method. Electrode evaluation, employing field-emission scanning electron microscopy FESEM, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS), demonstrated promising morphological and electrochemical characteristics. At low scan rates, both symmetric and asymmetric supercapacitors exhibited a notable gravimetric capacitance (221, 111, and 162 F g^–1 at 1 mV s^–1). Additionally, they revealed higher power density (173, 137, and 161 W kg^–1 at 10 mV s^–1), showcasing pseudocapacitive and electric double-layer capacitor (EDLC) behavior for NiO NPs and EG, respectively. This research significantly contributes valuable insights by presenting a sustainable synthesis route for NiO NPs, developing high-performance supercapacitor electrodes, and achieving a comprehensive understanding of the electrochemical behavior of NiO NPs and EG.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"330 - 345"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600988","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":"Kinetic Regularities of the Synthesis of Silica Nanoparticles by Heterogeneous Hydrolysis of Tetraethoxysilane Using L-Arginine as a Catalyst","authors":"V. M. Masalov,&nbsp;N. S. Sukhinina,&nbsp;D. N. Sovyk,&nbsp;V. G. Ralchenko,&nbsp;G. A. Emel’chenko","doi":"10.1134/S1061933X23601257","DOIUrl":"10.1134/S1061933X23601257","url":null,"abstract":"<p>The kinetics of the synthesis of silica nanoparticles (&lt;50 nm) has been studied under the conditions of heterogeneous hydrolysis of tetraethoxysilane (TEOS) using <i>L</i>-arginine as an alkaline catalyst. The rates of silica formation have been determined in a temperature range of 10–95°C at catalyst concentrations of 6–150 mM. It has been shown that the activation energy of the process depends on catalyst concentration and varies in a range of 21.5–13.9 kJ/mol, while decreasing linearly with increasing concentration of <i>L</i>-arginine in the system. The criterion of maintaining the monodispersity has been estimated for SiO₂ particles being grown “onto seeds.” The density of submicron-sized silica particles has been experimentally determined as depending on the annealing temperature. Within a temperature range of 200–1000°C, the particle density varies from 2.04 to 2.20 g/cm³.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"248 - 257"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1061933X23601257.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of Homogeneous Nucleation on the Intensity of Evaporation/Condensation Processes","authors":"V. Yu. Levashov,&nbsp;A. P. Kryukov,&nbsp;I. N. Shishkova","doi":"10.1134/S1061933X23601361","DOIUrl":"10.1134/S1061933X23601361","url":null,"abstract":"<p>An approach based on the direct numerical solution of the Boltzmann kinetic equation is proposed to take into account the influence of homogeneous nucleation on the mass transfer intensity in the evaporation/condensation (recondensation) problem. On the basis of the comparison between the scales of the formation time of a critical-size droplet and the time of supersaturation propagation, it is shown that it is possible to describe the considered problem in two stages, i.e., without taking into account the influence of droplets at the first stage and with taking into account their influence at the second stage. The calculation results show that, in the case of immobile droplets, there is a strong influence of bulk condensation on the intensity of the evaporation/condensation process.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"232 - 240"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600948","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":"Synthesis and Study of Superhigh-Concentrated Organosols of Silver Nanoparticles","authors":"S. A. Vorobyev,&nbsp;M. Yu. Flerko,&nbsp;S. A. Novikova,&nbsp;E. V. Mazurova,&nbsp;Ye. V. Tomashevich,&nbsp;M. N. Likhatski,&nbsp;S. V. Saikova,&nbsp;A. S. Samoilo,&nbsp;N. A. Zolotovsky,&nbsp;M. N. Volochaev","doi":"10.1134/S1061933X23601294","DOIUrl":"10.1134/S1061933X23601294","url":null,"abstract":"<p>Due to their unique properties, organosols of silver nanoparticles are widely used in optical and semiconductor devices, to produce electrically and thermally conductive films, as catalysts, antibacterial materials, etc. This work proposes a simple and highly productive method for the preparation of silver organosols, which have a metal concentration as high as 1800 g/L and contain spherical nanoparticles with low polydispersity and a median size of 9.1 nm. The method consists in the initial preparation of silver nanoparticle hydrosols with a concentration of higher than 30 g/L followed by the transfer of the NPs into an organic phase of <i>o</i>-xylene. A set of physical research methods has been employed to study the regularities of the extraction of silver nanoparticles with <i>o</i>-xylene in the presence of cetyltrimethylammonium bromide (CTAB) and ethanol and to determine the optimal process conditions, under which the extraction degree is as high as 62.5%. It has been found that bromine anions contained in CTAB molecules cause the aggregation of some amount of silver nanoparticles with the formation of silver metal sediment in the aqueous phase. According to X-ray photoelectron spectroscopy data, the sediment contains bromide ions (up to 4 at %) on the particle surface. Organosols synthesized under optimal conditions are stable for more than 7 months and withstand repeated cycles of drying and redispersing. Silver organosols have been used to obtain metal films with an electrical conductivity of about 68 500 S/cm, which increases to 412 000 and 509 500 S/cm (87.8% of the electrical conductivity of bulk silver) after thermal treatment at 150 and 250°C, respectively.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"208 - 217"},"PeriodicalIF":1.4,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1061933X23601294.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140600983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}