Colloid Journal最新文献_第6页

On the Problem of Stability of Small Objects by the Example of Molecular Dynamics Models of Metal Nanoparticles and Nanosystems 以金属纳米粒子和纳米系统的分子动力学模型为例，论小物体的稳定性问题

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-03-18 DOI: 10.1134/S1061933X23601191

V. M. Samsonov, N. Yu. Sdobnyakov, A. Yu. Kolosov, S. S. Bogdanov, I. V. Talyzin, S. A. Vasilyev, K. G. Savina, V. V. Puytov, A. N. Bazulev

{"title":"On the Problem of Stability of Small Objects by the Example of Molecular Dynamics Models of Metal Nanoparticles and Nanosystems","authors":"V. M. Samsonov, N. Yu. Sdobnyakov, A. Yu. Kolosov, S. S. Bogdanov, I. V. Talyzin, S. A. Vasilyev, K. G. Savina, V. V. Puytov, A. N. Bazulev","doi":"10.1134/S1061933X23601191","DOIUrl":"10.1134/S1061933X23601191","url":null,"abstract":"After briefly discussing the problem of stability/instability of dispersed systems in colloid chemistry, including ideas and concepts dating back to P.A. Rehbinder, the following classification has been proposed for instabilities of individual (free) nanoparticles: (1) instability with respect to the spontaneous disintegration into individual molecules (atoms) or smaller nanoclusters; (2) instability of shape; (3) instability of the integral structure of nanoparticles; (4) instability of the mesoscopic structure; (5) instability of physicochemical characteristics of nanoparticles; and (6) instability with respect to an external environment, including chemical instability, e.g., instability to oxidation. The problems concerning the stability of isomers of metal nanoclusters and of bimetallic core-shell nanostructures are considered as examples. The theoretical concepts of stability and instability have been illustrated by our molecular dynamics data on isomers of Au nanoclusters and mutually inverse (alternative) bimetallic Co@Au and Au@Co core-shell nanostructures, where the first element (before symbol @) corresponds to the central region (core) of a particle, while the second one refers to its shell.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140169763","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

Influence of the Structure of Sulfonic Polyelectrolyte Matrices on the Adsorption of Cu2+ Ions 磺酸型聚电解质基质的结构对 Cu2+ 离子吸附的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-03-18 DOI: 10.1134/S1061933X23600999

S. G. Laishevkina, O. D. Iakobson, E. M. Ivan’kova, B. M. Shabsel’s, N. N. Shevchenko

引用次数: 0

Colloidal Properties of Sophora Japanese Fruit Dispersion 日本槐果分散体的胶体特性

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-03-18 DOI: 10.1134/S1061933X23601002

P. A. Vasileva, I. B. Dmitrieva

{"title":"Colloidal Properties of Sophora Japanese Fruit Dispersion","authors":"P. A. Vasileva, I. B. Dmitrieva","doi":"10.1134/S1061933X23601002","DOIUrl":"10.1134/S1061933X23601002","url":null,"abstract":"Drug plant raw materials represent an important source of biologically active substances (BASs), which are used in pharmaceutical, cosmetic, food, and other industries. This paper presents the results of studying colloidal properties of crushed sophora Japanese fruits (hereinafter referred to as sophora) in order to improve the extraction of BASs. To achieve the goal, the following tasks have been set: the study of the ζ potential of sophora particles at different times of contact between the particles and an extractant and the pH values of the medium; determining the isoelectric point (IEP) of the sophora particles by electrophoresis; finding the point of zero charge (PZC) of sophora particles using potentiometric titration; and studying the influence of medium pH, sophora particle size, temperature, the presence of surfactants and ions, and the nature of an extractant on sophora swelling. The points of zero charge ({text{(p}}{{{text{H}}}_{{{text{PZC}}}}})) of the aqueous dispersions of sophora and extracted flavonoids are 5.8 and 5.2, respectively, thus being close to the values ({text{p}}{{{text{H}}}_{{{text{IEP}}}}}). The swelling of sophora particles is limited and accompanied by the gradual fracture of the plant cells. Adsorption equilibrium is achieved within 30 min. In an alkaline region and in the presence of alcohol, the swelling of the sophora particles decreases, while it increases at elevated temperature and in the presence of NaI ions.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140169767","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 Effects of Shear Parameters on the Stability of Emulsion Explosive Matrices 剪切参数对乳化炸药基质稳定性的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23600872

Jianmin Zhou, Yongsheng Jia, Yingkang Yao, Xianqi Xie, Mingsheng Zhao

{"title":"The Effects of Shear Parameters on the Stability of Emulsion Explosive Matrices","authors":"Jianmin Zhou, Yongsheng Jia, Yingkang Yao, Xianqi Xie, Mingsheng Zhao","doi":"10.1134/S1061933X23600872","DOIUrl":"10.1134/S1061933X23600872","url":null,"abstract":"This work demonstrated the criterion of shear stability of emulsion explosive matrices (EEM), combined with rheology test, interfacial tension test, droplet size test and the crystallization test of emulsion explosive matrices. The shear stability of emulsion explosive matrices was defined as the characteristic refinement time of the droplet size decrease in emulsification process. The constitutive relationship between the characteristic refinement time and droplet size of inner phase droplets was proposed by theoretical analysis and experiments on the emulsification process of emulsion explosive matrices. By analyzing the relationship between rheological properties and characteristic refinement time of emulsion explosive matrices, the relationship model between Bingham coefficient and dimensionless coefficient was established to characterize the shear stability of emulsion explosive matrices. The effects of shear strength, shear time and shear shape on the stability of emulsion explosive matrices were studied. In addition, there exists a critical value to quantitatively characterize the shear stability of emulsion explosive matrices.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919504","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 Nanodiamond–Lysozyme–Miramistin Composite and Prospects of Its Application in Heart Valve Prosthetics 纳米金刚石-溶菌酶-米拉米星复合材料的制备及其在心脏瓣膜假体中的应用前景

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23600987

M. G. Chernysheva, G. A. Badun, A. G. Popov, I. S. Chashchin, N. M. Anuchina, A. V. Panchenko

{"title":"Preparation of Nanodiamond–Lysozyme–Miramistin Composite and Prospects of Its Application in Heart Valve Prosthetics","authors":"M. G. Chernysheva, G. A. Badun, A. G. Popov, I. S. Chashchin, N. M. Anuchina, A. V. Panchenko","doi":"10.1134/S1061933X23600987","DOIUrl":"10.1134/S1061933X23600987","url":null,"abstract":"Creation of biocompatible coatings for xenogenic materials that can be used to manufacture prosthetic heart valves is an urgent and, unfortunately, still unsolved problem. It is necessary to obtain a biomaterial that would comply with the mechanical characteristics of a human valve and possess antimicrobial properties, which are of critical importance during the first postsurgical days. Biocompatible coatings can be used for this purpose, and it has turned out that detonation nanodiamonds are suitable for their preparation. The developed functional surface of nanodiamonds allows them to adsorb antibiotics; nanodiamonds are nontoxic and do not cause additional calcification. In this study, we have proposed to prepare a composite coating composed of nanodiamonds, lysozyme, and miramistin as broad-spectrum antimicrobial agents. The use of tritium-labeled nanodiamonds has made it possible to study the distribution of nanodiamond–lysozyme complexes after intravenous administration to mice and showed that the majority of the material remains at the place of injection. It has been shown that nanodiamond–lysozyme–miramistin composites exhibit strong antimicrobial activity, while the nanodiamond–miramistin complex shows no toxicity with respect to Staphylococcus aureus. Thus, the nanodiamond–lysozyme–miramistin composite can be used to create coatings for materials of prosthetic heart valves.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919642","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

New Polyfunctional Biamphiphilic Surfactants Based on Alkylmethylmorpholinium Cation and Dodecyl Sulfate Anion 基于烷基甲基吗啉阳离子和十二烷基硫酸酯阴离子的新型多官能双亲表面活性剂

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23601051

D. M. Kuznetsov, D. A. Kuznetsova, F. G. Valeeva, L. Ya. Zakharova

{"title":"New Polyfunctional Biamphiphilic Surfactants Based on Alkylmethylmorpholinium Cation and Dodecyl Sulfate Anion","authors":"D. M. Kuznetsov, D. A. Kuznetsova, F. G. Valeeva, L. Ya. Zakharova","doi":"10.1134/S1061933X23601051","DOIUrl":"10.1134/S1061933X23601051","url":null,"abstract":"New biamphiphilic surfactants (BSs) have been synthesized based on alkylmethylmorpholinium cation and dodecyl sulfate anion (Mor-n(DS), n = 4, 6, 8, 10). The structure of the biamphiphiles has been characterized by IR spectroscopy, 1H NMR spectroscopy, mass spectrometry, and elemental analysis. The aggregation behavior of the biamphiphiles in aqueous solutions has been assessed by tensiometry, conductometry, fluorescence spectroscopy (using a pyrene probe) and dynamic and electrophoretic light scattering. It has been shown that an increase in the hydrophobic tail length by two carbon atoms in an amphiphilic cation leads to an increase in the surface activity of the surfactant by ~5 units and a decrease in the aggregation threshold of the systems by 1.5–2 times. It has been established that the formation of aggregates with hydrodynamic diameters of 20–120 nm depending on the alkyl chain length of the alkylmethylmorpholinium cation and BS concentration. The zeta potential of the systems ranges from –25 to –100 mV and decreases with increasing biamphiphile concentration. Spectrophotometry has been employed to show a significant solubilization capacity of the biamphiphiles with respect to a hydrophobic dye Orange OT. The compounds obtained may be of interest for biomedical applications and other high-tech areas.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919498","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

Anionic Surfactant Adsorption on Activated Carbons Produced from Lignin and Modified with Cellulose Sulfoacetate 阴离子表面活性剂在由木质素制成并用磺基乙酸纤维素改性的活性炭上的吸附作用

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23601117

O. A. Kangina, M. G. Chernysheva, G. A. Badun, A. V. Lishai, N. G. Tsygankova, T. A. Savitskaya, D. D. Grinshpan

{"title":"Anionic Surfactant Adsorption on Activated Carbons Produced from Lignin and Modified with Cellulose Sulfoacetate","authors":"O. A. Kangina, M. G. Chernysheva, G. A. Badun, A. V. Lishai, N. G. Tsygankova, T. A. Savitskaya, D. D. Grinshpan","doi":"10.1134/S1061933X23601117","DOIUrl":"10.1134/S1061933X23601117","url":null,"abstract":"This work is devoted to studying the adsorption of sodium dodecyl sulfate (SDS) and sodium N-lauryl sarcosinate (NLS) on activated carbons produced from hydrolytic lignin using laboratory and pilot setups. Commercially available activated carbons produced by “Sorbent” Ltd. and SKT-3 are used for comparison. The surface of the activated carbons is modified (hydrophilized) by cellulose sulfoacetate (CSA) adsorption from aqueous solutions. Amounts of surfactants adsorbed on the activated carbon surface are determined from their radioactivity using tritium-labeled compounds. It has been found that the maximum adsorption of anionic surfactants is higher on activated carbons obtained from lignin. Adsorption values in the saturation region are 1.7 and 1.5 mmol/g for SDS and NLS on activated carbons obtained from lignin and 0.8 mmol/g for both surfactants adsorbed on commercial carbons. It has been shown that the preliminary application of CSA does not affect the maximum adsorption of NLS at its high concentrations; however, it reduces its adsorption in the initial region of the isotherm. Adsorption of CSA and its ability to be retained on the surface of the activated carbons is also studied. Tritium-labeled CSA has been used to show that the isotherm of its adsorption on activated carbon obtained from lignin is S-shaped beginning from a concentration of 0.5 g/L and reaches a maximum value of 25 mg/g. In the presence of NLS, the polymer is desorbed from the carbon surface by more than 50%.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919641","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

Influence of Composition and Temperature on Dynamic Properties of Mixed Monolayers of Pulmonary Lipids 成分和温度对肺脂混合单层动态特性的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23601142

A. G. Bykov, M. A. Panaeva, A. R. Rafikova, N. A. Volkov, A. A. Vanin

{"title":"Influence of Composition and Temperature on Dynamic Properties of Mixed Monolayers of Pulmonary Lipids","authors":"A. G. Bykov, M. A. Panaeva, A. R. Rafikova, N. A. Volkov, A. A. Vanin","doi":"10.1134/S1061933X23601142","DOIUrl":"10.1134/S1061933X23601142","url":null,"abstract":"The main component of pulmonary surfactant is dipalmitoyl phosphatidylcholine (DPPC), which reduces the surface tension almost to zero when the lung surface is compressed, thus preventing the alveolus from collapse in the course of exhalation. In this work the methods of the surface rheology have been employed to determine the influence of six pulmonary lipids on the dynamic surface properties of a DPPC monolayer at different temperatures and in a wide range of surface tensions. Particular attention has been paid to the region of low surface tensions (lower than 25 mN/m) at temperatures of 25 and 35°С, with these conditions being close to the physiological state on the internal surface of lungs. The addition of lipids with similar molecular structures to DPPC does not affect significantly the dynamic surface properties at a temperature of 25°C. At the same time, the addition of these lipids increases the surface elasticity in the region of low surface tensions at 35°С. However, under these conditions, the presence of lipids with unsaturated hydrocarbon radicals in the surface layer leads to the opposite effect and hinders the achievement of low surface tensions during slow compression. The results obtained have shown the possibility to control the properties of the lipid/DPPC mixed monolayer, which can be considered which can be considered as a model of pulmonary surfactant.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919499","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

Single Silver Nanoparticles: Local Refractive Index Response to Localized Surface Plasmon Resonance and Molar Attenuation Coefficient 单个银纳米粒子：局部折射率对局部表面等离子共振和摩尔衰减系数的响应

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-02-20 DOI: 10.1134/S1061933X23600860

Mazen Alrahili

{"title":"Single Silver Nanoparticles: Local Refractive Index Response to Localized Surface Plasmon Resonance and Molar Attenuation Coefficient","authors":"Mazen Alrahili","doi":"10.1134/S1061933X23600860","DOIUrl":"10.1134/S1061933X23600860","url":null,"abstract":"In this paper, we analyze the optical properties and sensitivities of spherical silver nanoparticles (AgNPs) with varying diameters (10–60 nm) in different surrounding medium, including water, ethanol, and chloroform. The investigation focuses on analytically assessing scattering efficiencies (({{Q}_{{{text{sca}}}}})), absorption efficiencies (({{Q}_{{{text{abs}}}}})), total extinction efficiencies (({{Q}_{{{text{ext}}}}})), shedding light on how the properties of AgNPs change with the size and surrounding medium of AgNPs. The results show that smaller AgNPs exhibit sharper plasmon resonance peaks at shorter wavelengths, while larger AgNPs display broader peaks in the visible spectrum, showcasing the size-dependent behavior of AgNPs. Additionally, the study calculates the molar attenuation coefficient (ε) and extinction cross section (({{sigma }_{{{text{ext}}}}})) for AgNPs, highlighting the differences in absorption properties between small and large particles and their sensitivity to the surrounding medium. The research also discusses the implications of these properties for applications such as plasmonic sensing and sensor design, emphasizing the importance of particle size and surrounding medium in optimizing sensor performance. Moreover, the refractive index sensitivity (S) and the figure of merit (FOM) are introduced as critical parameters for assessing sensor performance, revealing their relationship with particle size, and providing valuable insights into sensor design and optimization.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139919871","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

Experimental Study of Evaporation of Nanofluid Droplets on Substrates under Solar Radiation 太阳辐射下纳米流体液滴在基底上蒸发的实验研究

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-01-26 DOI: 10.1134/S1061933X23600902

Q. T. Tran, A. S. Dmitriev, P. G. Makarov, I. A. Mikhailova

{"title":"Experimental Study of Evaporation of Nanofluid Droplets on Substrates under Solar Radiation","authors":"Q. T. Tran, A. S. Dmitriev, P. G. Makarov, I. A. Mikhailova","doi":"10.1134/S1061933X23600902","DOIUrl":"10.1134/S1061933X23600902","url":null,"abstract":"This work is devoted to the experimental study of evaporating droplets of titania-, silica-, and diamond-based nanofluids on a substrate under solar radiation. The influence of various factors, including the type of a material, concentration of nanocomponents, irradiation direction, droplet volume, and substrate material, on the droplet evaporation has been investigated. As a result, the critical concentrations of nanoparticles, at which the evaporation rate reaches a stable level, have been determined for droplets of the studied nanofluids. The regimes and stages of the droplet evaporation process have been analyzed for the cases of the subcritical and critical nanoparticle concentrations. The efficiency of droplet evaporation under solar radiation has been shown to strongly depend on radiation direction. The effects of droplet volume and substrate material on the evaporation rate have been studied. In addition to the evaporation efficiency, the morphology of the structures deposited from the droplets has been analyzed. It has been shown that these structures depend on the concentration and material of nanoparticles, as well as on the regime of droplet evaporation. The results of this study enable one to gain a deeper insight into the behavior of the droplets during evaporation under irradiation especially in the IR region and confirm the promise of application of nanofluids in the solar thermal energy systems.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580721","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