Colloid Journal最新文献_第6页

Effect of Shear Loading Conditions on the Measured Strength of Ice Adhesion to Superhydrophobic Surfaces 剪切加载条件对超疏水表面冰粘附强度测量结果的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600180

K. A. Emelyanenko, A. M. Emelyanenko, L. B. Boinovich

{"title":"Effect of Shear Loading Conditions on the Measured Strength of Ice Adhesion to Superhydrophobic Surfaces","authors":"K. A. Emelyanenko, A. M. Emelyanenko, L. B. Boinovich","doi":"10.1134/S1061933X24600180","DOIUrl":"10.1134/S1061933X24600180","url":null,"abstract":"Despite the significant interest of researchers, icing of aircraft, vehicles, ships, and equipment of offshore oil structures remains to be an urgent problem. This paper considers the factors that promote a decrease in the strength of the contact between ice and surfaces under an applied shear load. The main attention is focused on studying the influence of the rate of shear loading on the fracture of the interfacial contact between ice and superhydrophobic coatings. The strength of the adhesive contact under the conditions of controlled variations in the applied load is measured using a technique based on the detachment of ice from a surface under the influence of centrifugal force. The study is carried out for large ensembles of samples in the temperature range from −5 to −20°C, thereby making it possible to evaluate the influence of the quasi-liquid layer and the Rehbinder effect on a decrease in the shear adhesive strength. The results obtained indicate that the contact between ice and a superhydrophobic coating is fractured through a mixed viscous–brittle mechanism. In this case, a decrease in temperature or an increase in the loading rate causes a transition from the viscous to the brittle fracture. These results indicate a potential acceleration of ice shedding with an increase in the growth rate of the shear stress.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"347 - 357"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1061933X24600180.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198006","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}

引用次数: 0

Parameters of the Ultimately Thin Surface Layer of Liquid Argon 液态氩极薄表面层的参数

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600192

V. S. Savvin

引用次数: 0

Highly Effective Photocatalytic Degradation of Malachite Green Dye for Waste Water Treatment through 1T/2H MoS2 Nanoflower 通过 1T/2H MoS2 纳米花高效光催化降解用于废水处理的孔雀石绿染料

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X2360118X

Ajay Kumar, Prateek Sharma, Divya Deep Yadav, Ranjana Jha

{"title":"Highly Effective Photocatalytic Degradation of Malachite Green Dye for Waste Water Treatment through 1T/2H MoS2 Nanoflower","authors":"Ajay Kumar, Prateek Sharma, Divya Deep Yadav, Ranjana Jha","doi":"10.1134/S1061933X2360118X","DOIUrl":"10.1134/S1061933X2360118X","url":null,"abstract":"The scientific community has preferred the photocatalysis process to remove organic pollutants from water. Many catalysts have been developed over the years, and one such catalyst is molybdenum disulfide (MoS2), which is a two-dimensional (2D) material with an energy bandgap in the visible spectrum. In this manuscript, the facile synthesis of MoS2 nanostructures in varying molybdenum (Mo) and sulphur (S), Mo/S ratios has been demonstrated through a single-pot hydrothermal route. The structural validation of the nanostructures was done using X-ray diffraction (XRD) patterns. Further, the morphological information about the MoS2 nanostructures was gathered using the Field Emission Scanning Electron Microscope (FE-SEM) and High-Resolution Transmission Electron Microscope (HR-TEM) analyses. The photodegradation process of the Malachite Green dye was analyzed by UV-visible absorption spectroscopy. The results showed that 1T/2H MoS2 nanoflowers degraded the malachite green dye with a degradation efficiency of 98.4%. The decomposition of this commonly used dye possesses great significance in industrial waste water treatment.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"476 - 489"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191000","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

Preparation of Carbon Nanotube Dispersions in Solutions of Ethoxylated Fatty Alcohols for Modifying Gel Systems 在乙氧基化脂肪醇溶液中制备碳纳米管分散体以改良凝胶系统

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600155

A. R. Gataullin, V. A. Abramov, S. A. Bogdanova, V. V. Salnikov, Yu. F. Zuev, Yu. G. Galyametdinov

{"title":"Preparation of Carbon Nanotube Dispersions in Solutions of Ethoxylated Fatty Alcohols for Modifying Gel Systems","authors":"A. R. Gataullin, V. A. Abramov, S. A. Bogdanova, V. V. Salnikov, Yu. F. Zuev, Yu. G. Galyametdinov","doi":"10.1134/S1061933X24600155","DOIUrl":"10.1134/S1061933X24600155","url":null,"abstract":"A systematic study has been performed for the effect of nonionic surfactants (NSs), i.e., ethoxylated higher fatty alcohols with different ethoxylation degrees, on the ultrasonic dispersion of carbon nanotubes in aqueous solutions and on the colloid-chemical properties of the resulting dispersions, namely, their optical density and the sizes and electrokinetic potentials of the particles in the colloidal systems. A non-linear dependence of the characteristics of dispersions on the ethoxylation degree has been revealed. This dependence is associated with structural transformations in NS molecules. The most efficient ethoxylation degree and concentration of nonionic surfactants in a solution, which have the highest disaggregating and stabilizing effects upon the preparation of carbon nanotube (CNT) dispersions, have been determined. The influence of the ethoxylation degree of the ethoxylated higher fatty alcohols on the electrokinetic properties of CNT dispersions has been revealed. It has been shown that carbon nanotube dispersions can be used to modify the rheological and electrical properties of gel systems based on rarely crosslinked poly(acrylic acid). The effects of NSs and CNTs on the viscosity, shear yield stress, consistency index, mechanical stability, relaxation time, and viscous flow activation energy of the polymer gels have been studied. It has been shown that the incorporation of nanotubes increases the electrical conductivity of the gels. The ultrastructure of the gel samples has been studied by transmission electron microscopy.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"358 - 369"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191081","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

Kinetics of Lead Sorption from Aqueous Solutions on Nanostructured Cryogel Modified with Organic Polymers 有机聚合物修饰的纳米结构冷凝凝胶从水溶液中吸附铅的动力学研究

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600131

T. S. Kuznetsova, A. E. Burakov, O. A. Ananyeva, I. V. Burakova, A. E. Memetova, V. O. Yarkin, A. G. Tkachev

{"title":"Kinetics of Lead Sorption from Aqueous Solutions on Nanostructured Cryogel Modified with Organic Polymers","authors":"T. S. Kuznetsova, A. E. Burakov, O. A. Ananyeva, I. V. Burakova, A. E. Memetova, V. O. Yarkin, A. G. Tkachev","doi":"10.1134/S1061933X24600131","DOIUrl":"10.1134/S1061933X24600131","url":null,"abstract":"The article proposes a method for producing polyaniline-modified nanocomposite cryogel based on oxidized carbon nanotubes and reduced graphene oxide. Phenol–formaldehyde resin has been used as a crosslinking agent. Cryogel has been obtained by freeze drying in vacuum. Then, the material has been subjected to a post-processing, i.e., the carbonization in a tubular furnace. The obtained nanocomposite has been subjected to the comprehensive diagnostics by the methods of scanning and transmission electron microscopy, IR spectroscopy, X-ray diffraction analysis, and Raman spectroscopy. The parameters of the pore space have been estimated by nitrogen adsorption. It has been found that the carbonized nanocomposite cryogel is a mesoporous material with a specific surface area of 299 m2/g. IR and Raman spectra and X-ray diffraction patterns of the starting materials have been compared with the spectra of the carbonized cryogel. According to the results obtained, the nanocomposite exhibits peaks of all starting materials. The sorption capacity of the material has been evaluated by the example of the sorption of ions of a heavy metal, lead, from model aqueous solutions. Kinetic studies of adsorption in a limited volume have been carried out to determine the mechanism and time of the adsorption. It has been revealed that 99% of the contaminant is sorbed during the first 15 min, while an adsorption capacity of 295 mg/g is reached. The Elovich model, pseudo-first- and pseudo-second-order models, and an intradiffusion model have been employed to confirm the proposed adsorption mechanism.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"408 - 417"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191076","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 Citrate on Morphological and Structural Properties of Hydroxyapatite Nanoparticles Synthesized by Wet Chemical Precipitation Method 柠檬酸盐对湿化学沉淀法合成的羟基磷灰石纳米粒子形态和结构特性的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600027

Thoudam Chanchan Devi, Ngasepam Bhogenjit Singh, Thiyam David Singh

{"title":"Effect of Citrate on Morphological and Structural Properties of Hydroxyapatite Nanoparticles Synthesized by Wet Chemical Precipitation Method","authors":"Thoudam Chanchan Devi, Ngasepam Bhogenjit Singh, Thiyam David Singh","doi":"10.1134/S1061933X24600027","DOIUrl":"10.1134/S1061933X24600027","url":null,"abstract":"Hydroxyapatite (HAp) nanoparticles organically modified with citrate group are fabricated via a simple wet chemical precipitation method. The as-synthesized nanoparticles are structurally characterized by TEM, XRD, FT-IR, EDAX and dynamic light scattering (DLS) to investigate in detail the influence of surface coating ligand i.e. citrate on HAp morphology, crystal structure, phase and colloidal stability of the particles. Production of single phase with hexagonal crystal structure is evident by XRD analysis. The work shows mesoporous structure could be synthesized under the influence of citrate as confirmed by TEM image and N2 adsorption−desorption isotherm. The experimental results indicate that citrate strongly influences HAp crystallization giving reduced particle size and uniform distribution. BET and BJH analysis indicate large surface area 135.74 m2/g and pore diameter of 9.86 nm with a total pore volume of 0.41 cm3/g respectively for 1 : 1 citrate to calcium ion molar ratio. The appropriate surface area and pore entrance significantly indicate potentiality to apply into biomedical fields as drug loading/delivery application.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"456 - 465"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141191077","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

The Self-Organization and Gelation Processes in a Cysteine–Silver Solution Containing Chitosan and an Electrolyte 含壳聚糖和电解质的半胱氨酸-银溶液中的自组织和凝胶化过程

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-30 DOI: 10.1134/S1061933X24600143

G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov

{"title":"The Self-Organization and Gelation Processes in a Cysteine–Silver Solution Containing Chitosan and an Electrolyte","authors":"G. R. Zenikov, S. D. Khizhnyak, A. I. Ivanova, P. M. Pakhomov","doi":"10.1134/S1061933X24600143","DOIUrl":"10.1134/S1061933X24600143","url":null,"abstract":"The self-assembly and gelation processes in low-concentrated aqueous solutions of L-cysteine and silver nitrate (cysteine–silver solution, CSS); low-molecular-weight water-soluble chitosan (CS); and a gelation initiator, CuSO4, have been studied by various physicochemical methods, namely, UV spectroscopy, dynamic light scattering, pH-metry, viscometry, and scanning electron microscopy. It has been found that the gelation of CSS, which is used as a gel precursor, under the action of chitosan (CS) and copper sulfate occurs in a narrow concentration range: CCH = 0.0100–0.0150 mg/mL, ({{C}_{{{text{CuS}}{{{text{O}}}_{{text{4}}}}}}}) = 0.4–0.6 mМ, CL-cys = 3.00 mМ, and ({{C}_{{{text{AgN}}{{{text{O}}}_{{text{3}}}}}}}) = 3.75 mM, when Ag+/Cys molar ratio is 1.27. Hydrogels of various CSS–CS and CSS–CS–CuSO4 compositions possess no high mechanical strength; however, they are stable in the course time. The structural elements of CSS, i.e., cluster chains of silver merchaptide (SM) zwitterions, are positively charged; therefore, no polyelectrolyte complexation occurs in CSS–CS and CSS–CS–CuSO4 hydrogels, because the pH of CSS is 2.6. Addition of CuSO4 to CSS–CS samples promotes the formation of a more strong hydrogel due to the association of SM clusters and CS molecules with sulfate anions and the coordination of Cu(II) ions with deprotonated carboxyl groups of different clusters.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"370 - 380"},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141190999","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

Features of Interaction of Lysozyme with PGLU–PEG Block Copolymers 溶菌酶与 PGLU-PEG 嵌段聚合物的相互作用特点

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-07 DOI: 10.1134/S1061933X23601336

L. Yu. Filatova, N. G. Balabushevich

引用次数: 0

Mechanochemical Preparation of Poly(vinyl alcohol)/Carboxymethyl Cellulose Composites 聚乙烯醇/羧甲基纤维素复合材料的机械化学制备方法

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-07 DOI: 10.1134/S1061933X23601312

O. N. Dabizha, O. A. Shilova, E. M. Ivan’kova

{"title":"Mechanochemical Preparation of Poly(vinyl alcohol)/Carboxymethyl Cellulose Composites","authors":"O. N. Dabizha, O. A. Shilova, E. M. Ivan’kova","doi":"10.1134/S1061933X23601312","DOIUrl":"10.1134/S1061933X23601312","url":null,"abstract":"Biodegradable solid-phase poly(vinyl alcohol)/carboxymethyl cellulose composites, which are promising to be used in pharmaceutics, agriculture, and chemical industry, have been obtained by an environmentally friendly method of “mild” mechanochemical activation without solvents and crosslinking agents. Air-dry mixtures of poly(vinyl alcohol) and carboxymethyl cellulose taken in mass ratios of 2 : 1, 1 : 1, and 1 : 2 have been subjected to a shock–shear action for 3 and 5 min (mechanical energy doses of 0.74 and 1.24 kJ/g) using an IVS-4 vibrating grinder (1500 rpm; 23.4 Hz; 0.55 kW; sample weight, 50 g; grinding bodies-to-sample mass ratio, 44 : 1). The mechanically activated samples in the form of medium powders (bulk density within a range of 600–1000 kg/m3) have been studied by the methods of scanning electron microscopy, differential scanning calorimetry, thermogravimetry, IR spectroscopy, optical microscopy, pycnometry, turbidimetry, and gravimetry. It has been found that the mechanochemical activation of an equimass mixture of poly(vinyl alcohol) and carboxymethyl cellulose at a mechanical energy dose of 1.24 kJ/g yields polymer solutions with a concentration of 1 g/dL that are rather transparent in the visible region (turbidity of 0.14 cm–1) and stable for 96 h. It has been revealed that, when being dried at 25°C, poly(vinyl alcohol) crystallizes from aqueous 1 and 2 g/dL solutions to form dendrites or crystallites after treatment at mechanical energy doses of 0.74 and 1.24 kJ/g, respectively. Polymer films of the composites have a complex morphology that includes dendritic and axialite crystalline forms. It has been found that the mechanochemical treatment stimulates the formation of crystalline forms of polymers, changes their intermolecular interaction, and affects the hydroxyl and ether groups of carboxymethyl cellulose, as well as the hydroxyl groups of poly(vinyl alcohol).","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"218 - 231"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885729","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

Refraction of Hydrosols Containing Diamond/Amorphous Carbon Composite Particles 含金刚石/无定形碳复合颗粒的水溶液的折射率

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-05-07 DOI: 10.1134/S1061933X24600040

O. S. Vezo, A. V. Voitylov, V. V. Vojtylov, M. P. Petrov, A. A. Trusov

{"title":"Refraction of Hydrosols Containing Diamond/Amorphous Carbon Composite Particles","authors":"O. S. Vezo, A. V. Voitylov, V. V. Vojtylov, M. P. Petrov, A. A. Trusov","doi":"10.1134/S1061933X24600040","DOIUrl":"10.1134/S1061933X24600040","url":null,"abstract":"Refractometric studies of hydrosols containing diamond nanoparticles have been carried out in this work. The samples for the study have been obtained from a statically synthesized diamond powder preliminarily subjected to standard purification by washing with strong acids and sonication. After additional repeated washing, centrifugation, sonication, and settling for a month, samples, whose particles contained different fractions of amorphous carbon, have been obtained. The particle size in the obtained samples was smaller than 100 nm. To analyze the data of refractometric measurements, equations have been derived that make it possible to determine the fraction of amorphous carbon in the particles and to calculate the thickness of its layer on the particle surface from the results of studying the refractive index and density of the sols of diamond particles. The data of the refractometric studies have been used to determine the ratios between the fractions of crystalline diamond and amorphous carbon in the particles. The performed studies have shown that the refractometric analysis of particle composition can be used to control the quality of industrially produced nanodiamonds.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 2","pages":"169 - 177"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140885528","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