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Aggregation and Magnetic Separation of Polyethylene Microparticles from Aqueous Solutions 水溶液中聚乙烯微粒的聚合与磁分离
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-20 DOI: 10.1134/S1061933X24600581
M. S. Filinkova, Yu. A. Bakhteeva, I. V. Medvedeva, I. V. Byzov, A. S. Minin, I. A. Kurmachev
{"title":"Aggregation and Magnetic Separation of Polyethylene Microparticles from Aqueous Solutions","authors":"M. S. Filinkova,&nbsp;Yu. A. Bakhteeva,&nbsp;I. V. Medvedeva,&nbsp;I. V. Byzov,&nbsp;A. S. Minin,&nbsp;I. A. Kurmachev","doi":"10.1134/S1061933X24600581","DOIUrl":"10.1134/S1061933X24600581","url":null,"abstract":"<p>The determination of the amount and composition of artificial polymer microparticles in ponds requires the preparation of representative water samples. A new method has been proposed in this work for magnetic separation of polyethylene microparticles (PEMPs, 10–200 μm), with the method implying their aggregation with magnetic nanoparticles. Composite magnetic nanoparticles containing magnetite cores and silica shells functionalized with amino groups (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–NH<sub>2</sub>, <i>d</i><sub>hydr</sub> = 200 nm) have been synthesized and characterized. Due to electrostatic interactions, these nanoparticles can form aggregates with polyethylene particles and be separated from water under the action of a gradient magnetic field. The effects of added salts (NaCl, Na<sub>2</sub>SO<sub>4</sub>, NaH<sub>2</sub>PO<sub>4</sub>, and CaCl<sub>2</sub>) and a surfactant, sodium dodecyl sulfate (SDS), on the separation conditions of PEMPs from water have been studied. It has been shown that the addition of the magnetic particles in concentration <i>c</i> = 0.01 g/L to aqueous suspensions containing NaCl and NaH<sub>2</sub>PO<sub>4</sub> (<i>c</i> = 10 mM), and SDS (<i>c</i> = 3 mM) provides an efficiency of magnetic separation of PEMPs equal to, at least, 98% after preliminary exposure for 30 min and magnetic sedimentation for 15 min. As the concentration of NaCl and NaH<sub>2</sub>PO<sub>4</sub> is increased to 100 mM or in the presence of Na<sub>2</sub>SO<sub>4</sub>, the efficiency of PEMP magnetic separation decreases. In the presence of CaCl<sub>2</sub> and SDS, the efficiency of the magnetic sedimentation is no less than 98% at the studied concentrations of the salts. At least 80% of PEMPs are separated by magnetic filtration from model solutions simulating river and sea water within 5 min.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 6","pages":"967 - 979"},"PeriodicalIF":1.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826336","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}
引用次数: 0
Effect of Stabilizer Concentration on Parameters of Poly(D,L-lactide-co-glycolide) Nanoparticles Produced by Nanoprecipitation 稳定剂浓度对纳米沉淀法制备聚（D， l -丙交酯-羟基乙酸酯）纳米颗粒参数的影响
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-20 DOI: 10.1134/S1061933X24600921
E. V. Kuznetsova, A. E. Tyurnina, E. A. Konshina, A. A. Atamanova, K. T. Kalinin, S. V. Aleshin, V. G. Shuvatova, G. A. Posypanova, S. N. Chvalun
{"title":"Effect of Stabilizer Concentration on Parameters of Poly(D,L-lactide-co-glycolide) Nanoparticles Produced by Nanoprecipitation","authors":"E. V. Kuznetsova,&nbsp;A. E. Tyurnina,&nbsp;E. A. Konshina,&nbsp;A. A. Atamanova,&nbsp;K. T. Kalinin,&nbsp;S. V. Aleshin,&nbsp;V. G. Shuvatova,&nbsp;G. A. Posypanova,&nbsp;S. N. Chvalun","doi":"10.1134/S1061933X24600921","DOIUrl":"10.1134/S1061933X24600921","url":null,"abstract":"<p>Effect of a poly(vinyl alcohol) (PVA) stabilizer concentration on the parameters of nanoparticles prepared by nanoprecipitation of biodegradable poly(D,L-lactide-<i>co</i>-glycolide) (PLGA) copolymers has been studied. It has been revealed that, at a constant concentration of the organic phase (5 mg/mL), the hydrodynamic diameter of PLGA particles does not depend on stabilizer concentration in an aqueous phase (2.5–15 mg/mL) and is ~130–140 nm, while the polydispersity index and the absolute value of the electrokinetic potential of the particles decrease with an increase in the PVA concentration. It has been shown that the PVA concentration has almost no effect on the content of a hydrophobic model drug, docetaxel, loaded into the PLGA particles, as well as on its in vitro cytotoxic activity against mice colorectal carcinoma cells and human embryo lung fibroblasts of the CT26 and WI-38 lines, respectively. At the same time, the ability of drug-loaded PLGA particles to lyophilization and subsequent redispersion in water depend on the stabilizer concentration: the higher the PVA concentration in the system the easier the redispersion of the particles to their initial sizes.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 6","pages":"922 - 932"},"PeriodicalIF":1.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826341","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}
引用次数: 0
Monitoring of Aggregation Kinetics of Colloidal Systems by Light Scattering Methods 用光散射方法监测胶体系统的聚集动力学
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-20 DOI: 10.1134/S1061933X24600817
E. K. Alidzhanov, S. N. Letuta, Yu. D. Lantukh, D. A. Razdobreev
{"title":"Monitoring of Aggregation Kinetics of Colloidal Systems by Light Scattering Methods","authors":"E. K. Alidzhanov,&nbsp;S. N. Letuta,&nbsp;Yu. D. Lantukh,&nbsp;D. A. Razdobreev","doi":"10.1134/S1061933X24600817","DOIUrl":"10.1134/S1061933X24600817","url":null,"abstract":"<p>An original methodology is discussed for studying the aggregation kinetics of colloidal solutions. The methodology is based on the joint application of dynamic and static light scattering methods. The proposed methodology is theoretically justified by the concept of fractal dimension and scaling. Its experimental implementation is carried out using the example of colloidal gold solution aggregation initiated by a change in the ionic strength of the solution. The fractal dimension of Au clusters is determined from the angular and kinetic dependences of static light scattering. The hydrodynamic radii of the clusters are determined by the dynamic light scattering method. Based on the experimental results and a constructed model dependence of light scattering intensity on the sizes of clusters, a kinetic dependence is plotted for the concentration of Au clusters and the rate of their aggregation is estimated. The proposed method can be used to study the aggregation kinetics of fractal clusters in various colloidal systems.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 6","pages":"829 - 835"},"PeriodicalIF":1.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826340","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}
引用次数: 0
Control over the Wettability of a Material by Local Vibration on the Interfacial Layer 通过界面层局部振动控制材料的润湿性
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600672
E. N. Golubina, N. F. Kizim
{"title":"Control over the Wettability of a Material by Local Vibration on the Interfacial Layer","authors":"E. N. Golubina,&nbsp;N. F. Kizim","doi":"10.1134/S1061933X24600672","DOIUrl":"10.1134/S1061933X24600672","url":null,"abstract":"<p>It has been shown that the wettability of a material synthesized in the interfacial layer of a liquid/liquid heterogeneous system can be controlled by local vibrations. The influence of the nature of an organic acid, a metal, and a solvent on the contact angle of a material adhered to various substrates has been studied. It has been found that, under local vibrations, a material is synthesized with a more ordered structure, a higher roughness, a lower water content, and, as a consequence, a larger contact angle. Hydrophobic coatings with contact angles of 100–163° have been obtained on the studied substrates, with the coatings retaining their water-repellent properties under atmospheric conditions for a long time.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"680 - 689"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595326","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}
引用次数: 0
Dynamic Surface Properties of Copolymers of Styrene and Hydrophobized 4-Vinylbenzyl Chloride at an Air–Water Interface 苯乙烯与疏水性 4-乙烯基氯化苄共聚物在空气-水界面上的动态表面特性
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600805
A. D. Khrebina, P. S. Vlasov, I. M. Zorin, A. A. Lezov, A. R. Rafikova, P. S. Chelushkin, B. A. Noskov
{"title":"Dynamic Surface Properties of Copolymers of Styrene and Hydrophobized 4-Vinylbenzyl Chloride at an Air–Water Interface","authors":"A. D. Khrebina,&nbsp;P. S. Vlasov,&nbsp;I. M. Zorin,&nbsp;A. A. Lezov,&nbsp;A. R. Rafikova,&nbsp;P. S. Chelushkin,&nbsp;B. A. Noskov","doi":"10.1134/S1061933X24600805","DOIUrl":"10.1134/S1061933X24600805","url":null,"abstract":"<p>Kinetic dependences have been determined for the surface tension, dilatational dynamic surface elasticity, and ellipsometric angles of solutions of styrene copolymers with 4-vinylbenzyl chloride modified with <i>N</i>,<i>N</i>-dimethyldodecylamine. The micromorphology of the adsorbed and spread layers of these polyelectrolytes has also been studied. All kinetic dependences of the dynamic surface elasticity have turned out to be monotonic in contrast to those observed for previously studied solutions of polyelectrolytes free of polystyrene fragments. The peculiarities of the surface properties of the studied solutions may be related to the formation of microaggregates in the surface layers, because these microaggregates suppress the formation of loops and tails of polymer chains at the interfaces, and, consequently, decrease the surface elasticity after the local maximum. Atomic force microscopy data also indicate the formation of aggregates with sizes in the <i>Z</i> direction of 1–4 nm in the surface layers. The obtained results confirm the conclusions previously made about the formation of aggregates in the surface layers of solutions of polyelectrolytes containing fragments of sodium poly(styrene sulfonate). A 2D phase transition to a denser surface phase and the formation of aggregates with a size of 40 nm in the <i>Z</i> direction have been observed at surface pressures of 25–30 mN/m for the layers of the studied styrene-free polyelectrolyte spread over an aqueous substrate.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"791 - 802"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595549","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}
引用次数: 0
Weather-Resistant Organosilicate Coatings with Improved Water Resistance 耐候性更强的有机硅涂料
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600593
L. N. Krasil’nikova, Ya. A. Khamidulin, V. I. Voshchikov, E. D. Vasilieva, A. K. Kychkin, Chi Van Nguyen, A. M. Nikolaev, Yu. E. Gorshkova, O. A. Shilova
{"title":"Weather-Resistant Organosilicate Coatings with Improved Water Resistance","authors":"L. N. Krasil’nikova,&nbsp;Ya. A. Khamidulin,&nbsp;V. I. Voshchikov,&nbsp;E. D. Vasilieva,&nbsp;A. K. Kychkin,&nbsp;Chi Van Nguyen,&nbsp;A. M. Nikolaev,&nbsp;Yu. E. Gorshkova,&nbsp;O. A. Shilova","doi":"10.1134/S1061933X24600593","DOIUrl":"10.1134/S1061933X24600593","url":null,"abstract":"<p>Currently, composites based on glass fibers and epoxy resins are successfully used to produce various structural elements. Such structures often serve under extreme conditions of both the Far North and the tropics, with such conditions having a destructive effect on the materials causing degradation of their properties. In this case, water resistance is an important characteristic of the materials. One of the ways to protect such materials is the use of organosilicate coatings (OSCs) obtained on the basis of organosilicon varnishes and highly dispersed hydrosilicates. This article presents the results of laboratory studies and field tests carried out in areas with very cold, as well as tropical savannah and subequatorial climates, of composite and metallic materials protected with OSCs. The objects of the studies are OSCs based on a binder, KO-921 varnish modified with the aim to improve weather resistance, primarily, moisture resistance, with poly(dimethylsiloxane) and epoxy resin. Water absorption, contact angle, and hardness of OSCs have been studied as depending on the composition of the polymer binders, and the optimal concentrations of the precursors have been determined. The results of field tests have shown that the developed OSCs retain their water-repellent properties during long-term exposure in different climatic conditions, thereby confirming their applicability to protecting various materials under the conditions of both tropics and the Far North.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"719 - 729"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595548","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}
引用次数: 0
Modification of Antibacterial Superhydrophilic Surfaces to Enhance Their Resistance to Contamination with Fibers during Sanitation Procedures 改造抗菌超亲水表面，增强其在卫生程序中抵抗纤维污染的能力
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600763
F. S. Omran, V. V. Kaminsky
{"title":"Modification of Antibacterial Superhydrophilic Surfaces to Enhance Their Resistance to Contamination with Fibers during Sanitation Procedures","authors":"F. S. Omran,&nbsp;V. V. Kaminsky","doi":"10.1134/S1061933X24600763","DOIUrl":"10.1134/S1061933X24600763","url":null,"abstract":"<p>Superhydrophilic copper surfaces with hierarchical textures have exhibited a high efficiency in fighting against nosocomial infections. However, one of the key drawbacks of these surfaces is their high susceptibility to mechanical contamination with fibrous materials in the course of sanitation procedures. This study has proposed a method for a laser modification enhancing the resistance of superhydrophilic copper surfaces to fiber contamination during their sanitary treatment. The modified surfaces retain their superhydrophilicity and exhibit superhydrophobic properties after the application of a hydrophobic agent. Moreover, the proposed modification method improves the resistance of a hierarchical texture to abrasive wear while remaining preserved high bactericidal properties. The results obtained have suggested that these modified textured copper materials can be used as bactericidal contact surfaces to combat nosocomial infections in medical facilities.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"744 - 756"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595454","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}
引用次数: 0
Control over Technological Parameters of Detonation Spraying for Producing Titanium Dioxide Coatings with Specified Wetting Properties 控制爆破喷涂技术参数以生产具有特定润湿性能的二氧化钛涂层
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600933
V. V. Sirota, S. E. Savotchenko, V. V. Strokova, D. S. Podgoronyi, S. V. Zaitsev, A. S. Churikov, M. G. Kovaleva
{"title":"Control over Technological Parameters of Detonation Spraying for Producing Titanium Dioxide Coatings with Specified Wetting Properties","authors":"V. V. Sirota,&nbsp;S. E. Savotchenko,&nbsp;V. V. Strokova,&nbsp;D. S. Podgoronyi,&nbsp;S. V. Zaitsev,&nbsp;A. S. Churikov,&nbsp;M. G. Kovaleva","doi":"10.1134/S1061933X24600933","DOIUrl":"10.1134/S1061933X24600933","url":null,"abstract":"<p>The water-repellent properties have been studied for the surface of a protective metal–ceramic coating based on titanium dioxide. It has been shown that the water-repellent properties of the coating surface can be efficiently changed by varying the technological parameters of spraying. When producing the coatings, technological parameters, such as the distance between a substrate and a detonation gun barrel (spraying distance) and the speed of barrel movement, have been varied. Regularities have been derived to relate the technological parameters of the detonation spraying of the coating and its contact angle. It has been found that, under certain conditions, the dependence of the contact angle on the spraying distance obeys a parabolic law. Parameters have been calculated for the phenomenological equation that adequately describes the observed parabolic dependence. The optimal values of the detonation spraying parameters necessary to achieve the maximum hydrophobicity of the produced coatings have been determined.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"780 - 790"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595328","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}
引用次数: 0
Electrostatic Interaction of Dielectric Particles in Electrolyte Solution 电解质溶液中介质粒子的静电相互作用
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600659
S. I. Grashchenkov
{"title":"Electrostatic Interaction of Dielectric Particles in Electrolyte Solution","authors":"S. I. Grashchenkov","doi":"10.1134/S1061933X24600659","DOIUrl":"10.1134/S1061933X24600659","url":null,"abstract":"<p>The Poisson–Boltzmann equation has been employed to consider the electrostatic interaction between two charged dielectric spherical particles in a solution of a symmetric electrolyte. The interaction forces between the particles of the same radius have been calculated by the finite element method under the condition of uniform charge distribution on their surfaces in the absence of an external field. The dependence of the electrostatic repulsion forces between the particles on the magnitude of the particle charges and the dielectric permittivities of the particle materials and the ambient medium has been analyzed.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"690 - 698"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595442","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}
引用次数: 0
Modification as a Method for Regulation of Energy Characteristics and Functionalization of Solid Surfaces 将改性作为调节固体表面能量特性和功能化的一种方法
IF 1.4 4区 化学
Colloid Journal Pub Date : 2024-11-06 DOI: 10.1134/S1061933X24600465
Yu. G. Bogdanova, V. D. Dolzhikova
{"title":"Modification as a Method for Regulation of Energy Characteristics and Functionalization of Solid Surfaces","authors":"Yu. G. Bogdanova,&nbsp;V. D. Dolzhikova","doi":"10.1134/S1061933X24600465","DOIUrl":"10.1134/S1061933X24600465","url":null,"abstract":"<p>The surfaces of solids (gold, silver, and polymers) have been modified with adsorption layers of various compounds. Optimal modification conditions have been determined using the methods of contact angle measuring and quartz crystal microbalance. The degree of surface coverage with the adsorption layer has been calculated and the data obtained have been compared with the results of the direct measurements of adsorption. The surface energy of the modifying layers has been determined and the potential application fields of the modified solids as functional materials have been demonstrated.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 5","pages":"655 - 666"},"PeriodicalIF":1.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595455","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}
引用次数: 0
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