Colloid Journal最新文献_第7页

Fluorescence-Free Tracking of Polystyrene Microplastics in Mosquito Larvae Using Dark-Field Hyperspectral Microscopy 利用暗视野超光谱显微镜无荧光跟踪蚊子幼虫体内的聚苯乙烯微塑料

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/S1061933X24600167

M. A. Kryuchkova, I. R. Ishmukhametov, Y. A. Frank, A. V. Simakova, V. V. Yartsev, D. A. Nadueva, A. A. Varenitsina, Y. V. Andreeva, R. F. Fakhrullin

引用次数: 0

Novel Synthesis of ZnO–Ag2O Nanocomposite Crystals and Their Photocatalytic and Antibacterial Activity Evaluation 氧化锌-氧化银纳米复合晶体的新型合成及其光催化和抗菌活性评估

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/S1061933X2460012X

Haoyu Li, Ruojun Ye, Xingping Zhou

{"title":"Novel Synthesis of ZnO–Ag2O Nanocomposite Crystals and Their Photocatalytic and Antibacterial Activity Evaluation","authors":"Haoyu Li, Ruojun Ye, Xingping Zhou","doi":"10.1134/S1061933X2460012X","DOIUrl":"10.1134/S1061933X2460012X","url":null,"abstract":"This paper reports on the successful preparation of a series of ZnO–Ag2O nanocomposite crystals with varying elemental contents by a novel oil−water interface method. The structures, compositions, microscopic morphologies, and optical properties of these crystals were characterized using HRTEM, SEM, XRD, EDX, XPS, UV-Vis, and PL measurements. The obtained well-dispersed hetero-structure nanocomposite crystals, with a particle size mainly ranged from 50 to 100 nm and a high purity, displayed a good absorption ability in the visible region. Virtually, the nanocomposite crystals exhibited a significant red-shift 5–15 nm in the UV diffuse absorption edge towards the visible range, accompanied by a substantial reduction in fluorescence absorption intensity. Importantly, the photocatalytic degradation of these nanocomposites was tested against Congo red (CR) dye under visible light excitation. The results revealed that the degradation efficiencies of ZnO–Ag2O nanocomposite crystals against CR under visible light were 9.4 and 2.7 times as high as those of pure ZnO and Ag2O nanoparticles, respectively. Also, the antimicrobial function of ZnO–Ag2O nanocomposite crystals was tested against harmful bacteria. The study results indicated that the diameters of inhibition zone of the nanocomposite crystals were respectively 13.5 mm for Gram-negative Escherichia coli and 12.9 mm for Gram-positive Bacillus subtilis, significantly larger than that of pure ZnO due to the synergistic effects of ZnO and Ag2O nanoparticles. The high photocatalytic efficiency and strong antimicrobial activity of ZnO–Ag2O nanocomposite crystals suggest their great significance in degrading pollutants and killing harmful bacteria.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"490 - 503"},"PeriodicalIF":1.4,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718624","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

On the Theory of Dynamic Susceptibility of Soft Magnetic Colloids 论软磁胶体的动态感应性理论

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/S1061933X24600246

A. Yu. Zubarev, L. Yu. Iskakova, A. Yu. Musikhin

{"title":"On the Theory of Dynamic Susceptibility of Soft Magnetic Colloids","authors":"A. Yu. Zubarev, L. Yu. Iskakova, A. Yu. Musikhin","doi":"10.1134/S1061933X24600246","DOIUrl":"10.1134/S1061933X24600246","url":null,"abstract":"The magnetization reversal kinetics has been theoretically considered for a nanosized ferromagnetic particle in a soft viscoelastic medium. In contrast to well-known works, we have considered the simultaneous action of the Néel mechanism of magnetization reversal of a particle (overcoming the potential barrier of magnetic anisotropy by its magnetic moment), and rotation (turn) of the particle body as a result of a change in the external magnetic field. The case of a high magnetic anisotropy of the particle is considered, i.e., it has been assumed that its energy significantly exceeds the thermal energy of the system and the energy of the interaction between the particle and the magnetic field. No other limitations have been imposed on field strength. The case of low fields has been considered in greater detail in the linear approximation of the dependence of magnetization on the field. The components of the complex susceptibility of the composite are calculated within the framework of this approximation. It has been shown that the real component of the susceptibility decreases monotonically with the field frequency. If the stiffness of the composite is high or low, the imaginary component has one maximum, which corresponds to the Néel mechanism of magnetization reversal or particle rotation in a viscoelastic medium, respectively. At intermediate values of composite stiffness, the frequency dependence of the imaginary susceptibility has two maxima.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 3","pages":"381 - 395"},"PeriodicalIF":1.4,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718675","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

Fluorescein Binding with Chitosan and a Chitosan-Based Polyelectrolyte Complex in Aqueous Solutions 水溶液中荧光素与壳聚糖和壳聚糖聚电解质复合物的结合

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/S1061933X24700200

G. M. Mirgaleev, S. V. Shilova

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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