Colloid Journal最新文献_第2页

Spectrophotometric Determination of the Critical Micelle Concentrations of Polyoxyethylated Alkylphenols in Aqueous Solutions 分光光度法测定水溶液中聚氧乙基烷基酚的临界胶束浓度

IF 1.1 4区化学

Colloid Journal Pub Date : 2024-09-05 DOI: 10.1134/s1061933x24600489

N. B. Shestopalova, Yu. A. Fomina

{"title":"Spectrophotometric Determination of the Critical Micelle Concentrations of Polyoxyethylated Alkylphenols in Aqueous Solutions","authors":"N. B. Shestopalova, Yu. A. Fomina","doi":"10.1134/s1061933x24600489","DOIUrl":"https://doi.org/10.1134/s1061933x24600489","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A spectrophotometric method has been employed to study micellization of nonionic surfactants (NSs), namely, polyoxyethylated alkylphenols, Triton X-100 (TX-100) and Triton X-114 (TX-114), in aqueous solutions. The spectral characteristics have been calculated for the curves of light absorption by surfactant solutions in concentration ranges of 0.02–0.80 and 0.02–0.40 mmol/L for TX-100 and TX-114, respectively. The influence of the steps of scanning along the wavelength scale (0.1, 0.2, 0.5, and 1.0 nm) on the positions of the maxima and the intensities of the absorption has been studied. The optical density has been found to increase monotonically throughout the concentration range. It has been revealed that, at all scanning steps, a bathochromic shift is observed for the absorption maximum of the long-wavelength band (275 nm) by 1.5 and 2.0 nm for TX-114 and TX-100, respectively, at certain NS concentrations. The curve for the dependence of absorption maximum position on NS concentration exhibits a characteristic inflection, whose position depends on the scanning step. A new method has been proposed for the spectrophotometric determination of the critical micelle concentrations (CMCs) of TX-100 and TX-114 from the dependence of the position of the absorption maximum of the long-wavelength band in the electronic absorption spectrum on the surfactant concentration in an aqueous solution. It has been found that a scanning step of 0.1 nm is optimal for the graphical determination of CMC. The CMC values have been determined for TX-100 and TX-114. The obtained values have appeared to be consistent with the literature data and equal to (0.24 ± 0.02) and (0.20 ± 0.01) mmol/L, respectively.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210356","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

Microfluidic Synthesis of Magnetite Nanoparticles and its Comparison with Synthesis in a Batch Reactor 磁铁矿纳米粒子的微流控合成及其与间歇反应器合成的比较

IF 1.1 4区化学

Colloid Journal Pub Date : 2024-09-05 DOI: 10.1134/s1061933x24600374

A. I. Nikiforov, E. O. Lazareva, E. V. Edemskaya, V. G. Semenov, K. G. Gareev, D. V. Korolev

引用次数: 0

Interaction of Ultrasmall Gold Nanoparticles with Liquid-Crystalline DNA Microparticles: Destruction vs Stabilization 超小型金纳米颗粒与液晶 DNA 微颗粒的相互作用：破坏与稳定

IF 1.1 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/s1061933x24600234

M. A. Kolyvanova, M. A. Klimovich, E. M. Shishmakova, A. A. Markova, O. V. Dement’eva, V. M. Rudoy, V. A. Kuz’min, V. N. Morozov

引用次数: 0

Estimation of the Thickness of Ice Melting Front by Studying the Kinetics of Ice Ball Melting in Air 通过研究冰球在空气中融化的动力学估计冰融化前沿的厚度

IF 1.1 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/s1061933x24600179

I. S. Stepanov, L. I. Budaeva, S. V. Stepanov

引用次数: 0

Phenomenological Description of the “Structure–Property” Relation for Epoxy Oligomer Hardeners on the Basis of Internal Friction Spectra 基于内摩擦光谱的环氧低聚物硬化体 "结构-性能 "关系的现象学描述

IF 1.1 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/s1061933x24600076

V. A. Lomovskoy, S. A. Shatokhina, I. D. Simonov-Emel’yanov

引用次数: 0

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 1.1 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

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

IF 1.1 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":"https://doi.org/10.1134/s1061933x24600246","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>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.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"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

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 1.1 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":"https://doi.org/10.1134/s1061933x2460012x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper reports on the successful preparation of a series of ZnO–Ag<sub>2</sub>O 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–Ag<sub>2</sub>O nanocomposite crystals against CR under visible light were 9.4 and 2.7 times as high as those of pure ZnO and Ag<sub>2</sub>O nanoparticles, respectively. Also, the antimicrobial function of ZnO–Ag<sub>2</sub>O 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 <i>Escherichia coli</i> and 12.9 mm for Gram-positive <i>Bacillus subtilis</i>, significantly larger than that of pure ZnO due to the synergistic effects of ZnO and Ag<sub>2</sub>O nanoparticles. The high photocatalytic efficiency and strong antimicrobial activity of ZnO–Ag<sub>2</sub>O nanocomposite crystals suggest their great significance in degrading pollutants and killing harmful bacteria.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"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

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 1.1 4区化学

Colloid Journal Pub Date : 2024-07-15 DOI: 10.1134/s1061933x24700200

G. M. Mirgaleev, S. V. Shilova

引用次数: 0

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 1.1 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":"https://doi.org/10.1134/s1061933x24600180","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>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.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","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":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0