Colloid Journal最新文献_第3页

Statistical Optimization and Evaluation of the Adsorptive Efficiency of Base Modified Saccharum munja Biomass for Safranine O and Crystal Violet Dyes in Single and Binary Systems 碱基改性甘蔗生物质对红花O和结晶紫染料在单体系和双体系中吸附效率的统计优化与评价

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-04-09 DOI: 10.1134/S1061933X24601124

Anisha Grewal, Aniket Singh, Nishita Sharma, Partiksha Panghal, Sonika Singh, Surender Kumar

{"title":"Statistical Optimization and Evaluation of the Adsorptive Efficiency of Base Modified Saccharum munja Biomass for Safranine O and Crystal Violet Dyes in Single and Binary Systems","authors":"Anisha Grewal, Aniket Singh, Nishita Sharma, Partiksha Panghal, Sonika Singh, Surender Kumar","doi":"10.1134/S1061933X24601124","DOIUrl":"10.1134/S1061933X24601124","url":null,"abstract":"In this study, we have utilized the base treated Saccharum munja for the removal of Safranine O (SO) and Crystal Violet (CV) dyes from water. The as-synthesized composite was characterized by using various techniques to study the morphological and functional features. Response surface methodology was used to optimize the effect of various parameters such as pH, dosage, and concentration on the adsorption process. Moreover, the kinetics and isotherm of the adsorption process were evaluated using various models. The best-fitted kinetic model was the pseudo-second-order model for both the dyes. The Freundlich isotherm model was found to be the most appropriate for SO and CV dyes suggesting the multilayer adsorption. Further, the adsorption process was favorable as the value of 1/n falls between 0–1. The Langmuir maximum adsorption capacity (qmax) for SO and CV dyes was found to be 121.80 and 143.67 mg/g, respectively. The regeneration study was performed to check out the reusable capability of the composite and it showed a good regeneration stability upto five adsorption-desorption cycles. In conclusion, Saccharum munja can effectively reduce environmental pollution and offer a sustainable solution for dye removal.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 2","pages":"268 - 288"},"PeriodicalIF":1.4,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949555","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

Amino Acid-Based Biosurfactants: Promising and Ecofriendly Biomolecules for Attaining Sustainable Agriculture and Environmental Safety 氨基酸基生物表面活性剂：实现可持续农业和环境安全的有前途的生态友好型生物分子

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X24601021

Nizamul Haque Ansari, Shumaila Shahid, Mohd Shoeb Khan, Navaid Zafar Rizvi, S. M. Shakeel Iqubal, Amal Bahafi

{"title":"Amino Acid-Based Biosurfactants: Promising and Ecofriendly Biomolecules for Attaining Sustainable Agriculture and Environmental Safety","authors":"Nizamul Haque Ansari, Shumaila Shahid, Mohd Shoeb Khan, Navaid Zafar Rizvi, S. M. Shakeel Iqubal, Amal Bahafi","doi":"10.1134/S1061933X24601021","DOIUrl":"10.1134/S1061933X24601021","url":null,"abstract":"Biosurfactants are one of the recently investigated biomolecules that have enormous applications in many fields including agriculture. As there is a need to develop less toxic, and environmentally friendly surfactants, therefore, amino acid-based biosurfactants that are produced from renewable raw materials are of great demand nowadays and can be used as an alternative to conventional chemical surfactants. The negative effects of chemical surfactants present in agrochemicals and modern detergents can damage human health and the environment, thus there is a crucial requirement to explore innovative, well planned, as well as cost-effective natural products for the welfare of humanity. Biodegradable surfactants created through green chemistry, specifically amino acid-based surfactants, are a favourable alternative to avoid these risks. Since amino acids (AAs) are inexhaustible compounds, therefore biosurfactants based on AAs have abundant potential as eco-friendly and environmentally friendly substances. Their higher biodegradation ability, low or even no toxicity, temperature stability, and tolerance to pH fluctuations make these biosurfactants preferable over chemical surfactants. In modern agriculture, most chemical pesticides and fertilizers used are frequently associated with numerous environmental issues. Hence, the development of green molecules as biosurfactants has a promising role in this regard to ensure agricultural sustainability. Biosurfactants can be harnessed for plant pathogen management, plant growth elevation, improving the quality of agricultural soil by soil remediation, degradation of complex hydrocarbons, increasing bioavailability of nutrients for advantageous plant-microbe interactions, and improving plant immunity, hence, they can supersede the grim synthetic surfactants which are presently being used.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"78 - 100"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818115","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

Investigation of Micellization and Spectrophotometric Study on the Interaction between Sodium Dodecyl Sulfate and Methylene Blue in Propanol-Water Mixed Solvent Media 十二烷基硫酸钠与亚甲基蓝在丙醇-水混合溶剂中胶束作用的研究及分光光度法研究

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X24601094

Bharti Budhalakoti, Bhavana Agarwal, Pooja Sharma, N. C. Kothiyal

{"title":"Investigation of Micellization and Spectrophotometric Study on the Interaction between Sodium Dodecyl Sulfate and Methylene Blue in Propanol-Water Mixed Solvent Media","authors":"Bharti Budhalakoti, Bhavana Agarwal, Pooja Sharma, N. C. Kothiyal","doi":"10.1134/S1061933X24601094","DOIUrl":"10.1134/S1061933X24601094","url":null,"abstract":"The study examines the micellization of sodium dodecyl sulfate (SDS) with methylene blue (MB) in a propanol-water mixed solvent system within a temperature spanning from 298.15–313.15 K. The conductivity measurements of SDS-MB complex was carried out at 5, 10, and 15% volume fraction of propanol in water both in absence and presence of dye. The variation of CMC with temperature was analyzed to assess thermodynamic parameters of micellization. This approach offers valuable insights on the behavior of surfactant in mixed solvent system and sheds lights on different interactions occurring within the system. Spectrophotometric analysis was conducted to investigate the interactions between SDS-MB complex at 5, 10, and 15% volume fraction of propanol in aqueous medium. An increment in volume fraction of propanol hinders the process of micellization. However, in the presence of MB increases the efficiency of micellization and rendering the process more spontaneous. Consequently, MB monomers become associated with micelle which is the case of dye solubilization.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"124 - 132"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818138","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

Electrochemical Synthesis of Silver Nanoparticles Using Camellia chrysantha Flower Extract: Characteristics and Antibacterial Activity 茶花提取物电化学合成纳米银的研究：特性及抗菌活性

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X24600854

H. T. Nguyen, L. M. Hoang, H. T. Nguyen, P. H. Nguyen, T. T. V. Hoa, T. T. T. Nhung, T. Q. Huy, D. C. To

{"title":"Electrochemical Synthesis of Silver Nanoparticles Using Camellia chrysantha Flower Extract: Characteristics and Antibacterial Activity","authors":"H. T. Nguyen, L. M. Hoang, H. T. Nguyen, P. H. Nguyen, T. T. V. Hoa, T. T. T. Nhung, T. Q. Huy, D. C. To","doi":"10.1134/S1061933X24600854","DOIUrl":"10.1134/S1061933X24600854","url":null,"abstract":"Plant extracts are powerful agents in the green synthesis of metal or metal oxide nanoparticles for biomedical applications, as they are environmentally friendly and contain no toxic chemicals. This study used the electrochemical method with the Camellia chrysantha flower extract to synthesize green silver nanoparticles (AgNPs). The extract served as an electrolyte, reducing agent, and stabilizer. Without chemicals, the synthesized nanoparticles were characterized by ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), transmission electron microscopy (TEM), and zeta potential methods. The antibacterial activity of AgNPs against Escherichia coli and Staphylococcus aureus was evaluated using minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) methods. The results indicate successful synthesis of AgNPs with a size distribution of 4–14 nm, an average size of 8.20 nm, and spherical morphology. The AgNPs synthesized by the electrochemical method using C. chrysantha flower extract exhibited a zeta potential of −29.7 mV, indicating good dispersion, and demonstrated high antibacterial activity against both Gram-positive and Gram-negative bacterial strains. Given the traditional use of C. chrysantha flowers in food and cosmetics, the synthesis of AgNPs from this extract offers potential applications in various fields including cosmetics, food, and medicine.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"163 - 172"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818146","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 Nano Felodipine-Loaded Spanlastic Carriers for Buccal Delivery: Formulation, Optimization and Characterization 新型纳米非洛地平口腔给药载体：配方、优化和表征

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X2460088X

Deeplaxmi Dasharath Kambli, Cleona Elizabeth Mary DCruz, Lalit Kumar, Rupesh Kalidas Shirodkar

{"title":"Novel Nano Felodipine-Loaded Spanlastic Carriers for Buccal Delivery: Formulation, Optimization and Characterization","authors":"Deeplaxmi Dasharath Kambli,  Cleona Elizabeth Mary DCruz, Lalit Kumar, Rupesh Kalidas Shirodkar","doi":"10.1134/S1061933X2460088X","DOIUrl":"10.1134/S1061933X2460088X","url":null,"abstract":"Felodipine, a Dihydropyridine calcium channel antagonist, is widely used to treat hypertension and angina pectoris. Its highly lipophilic nature and low aqueous solubility classify it as a Biopharmaceutics Classification System Class II Drug. When administered orally, Felodipine undergoes extensive first-pass hepatic metabolism, resulting in low oral bioavailability (15%) and posing challenges for effective antihypertensive therapy. This study aimed to formulate drug-loaded nanovesicular Spanlastics within oral fast-dissolving films, enabling buccal mucosa delivery to bypass hepatic metabolism and enhance drug bioavailability. Felodipine nanovesicular Spanlastics were formulated using a modified Ethanol Injection method. Design Expert® Software Version 13 and a 23 factorial design model determined the effect of formulation variables on response variables. The Spanlastics, characterized for particle size (ranging from 155.7 to 308.9 nm) and entrapment efficiencies (84.68 to 88.36%), showed lamellar, circularly shaped vesicles as observed through Optical and Transmission Electron Microscopy. These optimized Spanlastics were incorporated into oral fast-dissolving films, which exhibited substantial flexibility, sufficient mechanical strength, a disintegration time of 35 s, and rapid drug release of 95.99% within 5 min. Scanning Electron Microscopy imaging confirmed a smooth, porous, and uniform surface of the films. Short-term stability studies indicated that the films maintained stable physical and structural attributes. This research confirmed that Felodipine Spanlastic vesicles, due to their nanosize, enhance mucosal permeation and act as effective nanocarriers. Their incorporation into fast-dissolving oral films improves bioavailability through oro-mucosal tissue absorption for buccal delivery.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"143 - 162"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818147","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 and Properties of Fluorine Modified Butyl Acrylate/Methyl Methacrylate/Vinyl Acetate/Tertiary Vinyl Carbonate Quaternary Polymer Latex 氟改性丙烯酸丁酯/甲基丙烯酸甲酯/醋酸乙烯酯/叔碳酸乙烯酯季系聚合物乳胶的制备及性能

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X24600945

Zheqing Gong, Lijun Chen

{"title":"Preparation and Properties of Fluorine Modified Butyl Acrylate/Methyl Methacrylate/Vinyl Acetate/Tertiary Vinyl Carbonate Quaternary Polymer Latex","authors":"Zheqing Gong,  Lijun Chen","doi":"10.1134/S1061933X24600945","DOIUrl":"10.1134/S1061933X24600945","url":null,"abstract":"Acrylate polymer latex and vinyl acetate-tert-carbonatepolymer latex have been widely used as waterborne coating polymers for many industrial applications. A large number of open literatures have reported on the preparation and modification of acrylate latex or vinyl acetate-tert-vinyl carbonate latex, which are synthesized with semi-continuous seeded or soap-free emulsion polymerization or other advanced emulsion polymerization technology. However, the fluorine modified BA/MMA/VAc/VeoVa10 quaternary cross-linked polymer latex has not been reported in the open literatures. In this study, butyl acrylate (BA), methyl methacrylate (MMA), vinyl acetate (VAc), tertiary vinyl carbonate (VeoVa10) are the main monomers, and sulfosuccinateethoxyether alkyl monoester disodium salt (X-40) and alkylphenolpolyoxyethylene ether (LB-407) are used as the emulsifiers. Hydroxypropylmethacrylate (HPMA) and hexafluorobutyl methacrylate (HFMA) are used as the modified monomers. Potassium persulfate (KPS) is the initiator. The fluorine modified polymer latex is prepared via the semi-continuous seeded emulsion polymerization. The structure of the latex film is characterized by Fourier transform infrared spectroscopy (FTIR). Latex films are tested by the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and contact angle (CA). The particle size of the latex is measured with the Zetatrac dynamic light scattering instrument. The conditions for preparing the resultant latex is optimized and obtained as follows: the amount of emulsifier is 7 wt %; the amount of initiator is 0.8 wt %; the amount of HFMA is 5 wt %. The appearance of the resultant latex is translucent and blue and the average particle size of the polymer latex and its distribution are small, which is 57.89 nm and 0.048, respectively. The water contact angle increased to 95.45°. Thermal decomposition temperature of the film of the fluorine modified polymer latex is 17.33°C higher than that of the film of conventional polymer latex.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"133 - 142"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818137","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

Adsorption of Cu2+, Zn2+ and Fe3+ Ions in a Ternary System from Aqueous Solutions on Industrial Waste 4A Zeolite: Characterization, Dynamic, Kinetic and Thermodynamic Studies 工业废4A沸石对三元体系中Cu2+、Zn2+和Fe3+离子的吸附：表征、动力学、动力学和热力学研究

IF 1.4 4区化学

Colloid Journal Pub Date : 2025-02-10 DOI: 10.1134/S1061933X24601148

S. Bensafi, S. Amokrane, D. Nibou

{"title":"Adsorption of Cu2+, Zn2+ and Fe3+ Ions in a Ternary System from Aqueous Solutions on Industrial Waste 4A Zeolite: Characterization, Dynamic, Kinetic and Thermodynamic Studies","authors":"S. Bensafi, S. Amokrane, D. Nibou","doi":"10.1134/S1061933X24601148","DOIUrl":"10.1134/S1061933X24601148","url":null,"abstract":"The adsorption of Cu2+, Zn2+ and Fe3+ ions in a ternary system on waste zeolite 4A was examined under various experimental conditions (concentration, pH, solid/liquid ratio and temperature).The physicochemical and micro-structural characterization (X-ray diffraction, scanning electron microscopy, Brunauer–Emmett–Teller, Fourier transform infrared spectroscopy, X-ray fluorescence, ultraviolet-visible spectroscopy and thermogravimetry/differential thermal analysis) techniques were applied. Fourier transform infrared spectroscopy was highlighted the bands characteristic of functional groups Me-(H2O), O–H (H2O), C–O, Me–Si–OH, Me–O and Si–OH of 4A and adsorbed by Cu2+, Fe3+ and Zn2+ ions (CFZ4A). The nature and coordination environment of these species were demonstrated by Ultraviolet-Visible Spectroscopy. The results show that the experimental adsorption capacities of the studied ions in the ternary system were respectively 79.125, 47.207 and 95.185 mg/g for Cu2+, Zn2+ and Fe3+. Temkin, Dubinin-Radushkevich and Freundlich equilibrium models give the best fit for the Cu2+, Zn2+ and Fe3+ ions according to R2 and the minimum values of Akaike information criteria. Elovich and Double exponential kinetics models are most appropriate to describe the adsorption data of Cu2+ and Zn2+ ions and Johnson-Mehl-Avrami model describes well the Fe3+ ions. The increase in temperature leads to a decrease in the free energy which indicates that the reaction is spontaneous and more favorable at high temperatures. The fixation of copper, zinc and iron ions in a ternary system on the waste of commercial zeolite 4A shows certain selectivity according to the following order: Fe3+> Cu2+>Zn2+.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"87 1","pages":"101 - 123"},"PeriodicalIF":1.4,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818139","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 Dispersion Medium and Precipitating Agent on Sol and Gel Formation of Lead Zirconate-titanate Ceramic Precursor 分散介质和沉淀剂对锆钛酸铅陶瓷前驱体溶胶和凝胶形成的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-12-17 DOI: 10.1134/S1061933X24600957

N. D. Paramonova, E. A. Danilov, E. A. Ivanova

引用次数: 0

Influence of Multivalent Ions on the Electrosurface Properties of Tungsten(VI) Oxide Particles in Hydrosols 多价离子对水溶胶中氧化钨粒子电表面性质的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-12-17 DOI: 10.1134/S1061933X24600878

O. S. Veso, A. V. Voitylov, V. V. Vojtylov, L. E. Ermakova, M. P. Petrov, A. A. Trusov

{"title":"Influence of Multivalent Ions on the Electrosurface Properties of Tungsten(VI) Oxide Particles in Hydrosols","authors":"O. S. Veso, A. V. Voitylov, V. V. Vojtylov, L. E. Ermakova, M. P. Petrov, A. A. Trusov","doi":"10.1134/S1061933X24600878","DOIUrl":"10.1134/S1061933X24600878","url":null,"abstract":"Hydrosols containing tungsten(VI) oxide nanoparticles have been studied by the electrooptical and electrophoretic methods. The influence of multivalent ions (tetravalent thorium and trivalent lanthanum cations) on the zeta-potential and polarizability of tungsten(VI) oxide particles has been determined. The dispersion dependences of the polarizability of tungsten(VI) oxide particles have been studied. A strong dependence of the electrokinetic potential and a weak dependence of the polarizability of the particles on the concentrations of thorium and lanthanum cations in the sols have been found. The polarizability of the particles is low and weakly depends on the frequency of the field polarizing the particles. This is atypical for colloidal particles, for which the thickness of the dense part of the electrical double layer is comparable with the size of molecules, while the polarization of the electrical double layer is determined by its diffuse part. The obtained results have led to a conclusion that, for tungsten(VI) oxide particles in the studied concentration range, the majority of multivalent counterions are located in the dense part of the electrical double layer due to their high adsorption potential.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 6","pages":"848 - 856"},"PeriodicalIF":1.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826226","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 Iron Cations on Tetraethoxysilane Hydrolysis and Gelation Process 铁阳离子对四乙氧基硅烷水解和凝胶化过程的影响

IF 1.4 4区化学

Colloid Journal Pub Date : 2024-12-17 DOI: 10.1134/S1061933X24600611

E. N. Titov, D. E. Smalchenko, O. E. Lebedeva

{"title":"Influence of Iron Cations on Tetraethoxysilane Hydrolysis and Gelation Process","authors":"E. N. Titov, D. E. Smalchenko, O. E. Lebedeva","doi":"10.1134/S1061933X24600611","DOIUrl":"10.1134/S1061933X24600611","url":null,"abstract":"The influence of small additives of Fe3+ ions on tetraethoxysilane hydrolysis and subsequent polycondensation of products has been studied by the viscometry and dynamic light scattering methods. Experiments have been carried out at 50°C. Hydrolysis has been carried out at pH 1.5, 2.5, 5.0, or 7.0. The amount of the dopant cations has been varied from 1.5 to 3.8 at %. In the absence of the dopant cations, the gelation time grows with increasing pH from 1.5 to 5.0, while polycondensation occurs without gelation at pH 7.0. If the dopant is added at pH 1.5, the gelation time increases, but, at pH 2.5 and 5.0, it decreases. The gelation time increases with the dopant content at all three pH values. The size of the particles formed during the polycondensation process depends on the pH and the amount of the dopant. The smallest particles with a median diameter of about 10 nm are formed at pH 2.5. It is assumed that the cause of all observed effects is the incorporation of iron cations into the siloxane matrix. The degree of the incorporation depends on the degree of iron cation hydrolysis. This assumption is confirmed by the values of the electrokinetic potential of the studied systems and the dynamics of variations in the zeta-potential with varying pH and dopant content.","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"86 6","pages":"961 - 966"},"PeriodicalIF":1.4,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826426","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