Colloid Journal最新文献

{"title":"Impact of Glucose and Urea on Micellization of the Cetyltrimethylammonium Bromide−Sulfathiazole System under Different Temperature Conditions","authors":"Abhishek Srivastava,&nbsp;Ikechukwu Ugbaga Nkole,&nbsp;Krishna Srivastava,&nbsp;Neetu Srivastava","doi":"10.1134/S1061933X25601702","DOIUrl":"10.1134/S1061933X25601702","url":null,"abstract":"<p>The present investigation employs a conductometric approach to investigate the influence of differing concentrations of the antibiotic drug sulfathiazole (STZ) and the additives glucose/urea on the micellization behavior of the cationic surfactant cetyltrimethylammonium bromide (CTAB) in a slightly acidic environment (pH 5.0) across a range of temperatures. The aim of this study is to elucidate the influence of surfactant-drug interactions on micelle formation and dynamics, thereby establishing the possibility of advancing drug delivery systems and enhancing the therapeutic efficacy of drugs. Unlike CTAB in pure water, the CMC (critical micellar concentration) values of CTAB decreased in the presence of STZ, i.e., micellization was facilitated. Both glucose and urea increase the CMC of the CTAB + STZ system. Unlike urea, which destabilizes water structure and diminishes hydrophobic contacts, glucose stabilizes the water structure, making it harder for CTAB molecules’ hydrophobic tails to form micelles. The relationship between the CMC of the CTAB + STZ and temperature displayed a linear trend for both aqueous media and aqueous glucose/urea environment. Thermodynamic parameters (change in entropy of micellization, <span>(Delta S_{{text{m}}}^{{text{0}}})</span>; enthalpy of micellization, <span>(Delta H_{{text{m}}}^{{text{0}}})</span>; and Gibbs free energy of micellization, <span>(Delta G_{{text{m}}}^{{text{0}}})</span>) and physicochemical variables (CMC and counterion dissociation, α) have been used to characterize the interaction between CTAB and STZ. The negative <span>(Delta G_{{text{m}}}^{{text{0}}})</span> values reveal that the CTAB + STZ mixture undergoes spontaneous micellization in both pure water and aqueous glucose/urea environments. The values of −<span>(Delta H_{{text{m}}}^{{text{0}}})</span> and +<span>(Delta S_{{text{m}}}^{{text{0}}})</span> for the CTAB + STZ mixture indicate that both electrostatic and hydrophobic interactions play a crucial role in aggregation.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"702 - 714"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751539","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}

{"title":"Silver Decorated Lemon Peel Extract Functionalized Cobalt Ferrite Nanocomposite: Characterization, Multifunctional Antimicrobial and Catalytic Applications","authors":"Swati Gubbala,&nbsp;Gayathri Bindu Kurup,&nbsp;Prashanth Goud Banda,&nbsp;Raghasudha Mucherla","doi":"10.1134/S1061933X25601775","DOIUrl":"10.1134/S1061933X25601775","url":null,"abstract":"<p>A biogenic strategy was employed to develop a multifunctional magnetic nanocomposite by first synthesizing cobalt ferrite (CoFe₂O₄) nanoparticles (NPs) and subsequently functionalizing them with lemon peel extract (LPE) rich in phenolics and flavonoids. The LPE acted as a biogenic reducing and stabilizing agent, facilitating the <i>in situ</i> decoration of silver nanoparticles (Ag NPs) and yielding a novel ternary nanocomposite (Ag/LPE–CoFe₂O₄). Successful functionalization and Ag incorporation were confirmed by FTIR, XRD, FESEM, XPS, HRTEM, EDX and VSM. The Ag/LPE–CoFe₂O₄ nanocomposite exhibited noticeably enhanced antimicrobial activity against Gram-positive (<i>S. aureus</i>, <i>B. subtilis</i>), Gram-negative (<i>K. pneumoniae</i>, <i>E. coli</i>), and fungal strains (<i>Candida</i>, <i>Aspergillus</i>), resulting from the synergistic action of CoFe₂O₄, LPE phytochemicals, and Ag NPs. Catalytic tests further exhibited rapid reduction of 4-nitrophenol to 4-aminophenol under ambient conditions with a rate constant of 0.28 ± 0.02 min⁻¹ and complete conversion is achieved in 14 min. This study highlights the novelty of promoting citrus peel waste to engineer an Ag-decorated, magnetically retrievable nanocomposite that integrates recyclability, catalytic efficiency, and broad-spectrum antimicrobial activity. These results demonstrate Ag/LPE–CoFe₂O₄ NPs as an eco-friendly multifunctional nanocomposite with strong potential in environmental remediation and biomedical fields.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"662 - 678"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752060","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}

{"title":"Influence of Thermal Prehistory on the Thermophysical and Viscoelastic Properties of Aqueous Gels of Sulfonated Polyphenylquinoxaline","authors":"V. G. Vasiliev,&nbsp;M. I. Buzin,&nbsp;G. G. Nikiforova,&nbsp;N. M. Belomoina,&nbsp;E. G. Bulycheva","doi":"10.1134/S1061933X26600260","DOIUrl":"10.1134/S1061933X26600260","url":null,"abstract":"<p>This work examines the specific response of aqueous sulfonated polyphenylquinoxaline gels to temperature field exposure. This response manifests itself as an exothermic effect, the position of which in the temperature scale depends on the gel thermal prehistory. The observed exothermic effect is not associated with a phase transition; its manifestation requires the presence of a spatial network structure containing both free and bound solvent. This phenomenon is likely to be caused by relaxation-type exchange processes between the free solvent and the gel network. The influence of the free solvent redistribution in the network of the gel on its thermophysical and viscoelastic properties has been determined.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"530 - 536"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751664","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}

{"title":"Chemical and Structural Segregation in Ternary Pt–Pd–Cu Nanoparticles: Molecular Dynamics Simulation","authors":"V. M. Samsonov,&nbsp;D. V. Zhigunov,&nbsp;I. P. Sinitsa,&nbsp;S. A. Vasilyev,&nbsp;V. V. Puytov,&nbsp;I. V. Karakeyan","doi":"10.1134/S1061933X26600296","DOIUrl":"10.1134/S1061933X26600296","url":null,"abstract":"<p>Isothermal molecular dynamics, the LAMMPS program, and embedded atom method, have been employed to simulate the uniform heating of ternary Pt₁₇₀₀Pd₁₇₀₀Cu₅₁₀₀ nanoparticles (consisting of 8500 atoms, about 6.4 nm in size) and subsequent cooling (quenching) of nanodroplets to a final temperature of 300 K. The results obtained for the nanoparticles of this size have been compared with the data on smaller particles (4.6 nm) with the same percentage of the components (Pt_20%Pd_20%Cu_60%). The object of the research has been chosen due to the potential application of ternary Pt−Pd−Cu nanoparticles as nanocatalysts. To analyze the structural changes occurring in the nanoparticles during heating and cooling, the temperature dependences of the potential (cohesive) component of the specific internal energy and the gyration radii have been found and analyzed for all atomic subsystems (Pt, Pd, and Cu). Furthermore, the local structure of the nanoparticles has been investigated by the common neighbor analysis (CNA) implemented using the OVITO program. The composition of the two outer monolayers of solidified nanodroplets has been analyzed. The performed studies have revealed that the heating of nanoparticles with an initial uniform component distribution results in surface segregation of Pd atoms. The surface segregation of Pd is also characteristic of final configurations corresponding to solidified nanodroplets. In turn, Pt atoms are observed in the first (outer) atomic monolayer before nanoparticle melting and in the second and lower monolayers at all stages of heating and quenching. Not only the chemical segregation, i.e., the spatial separation of the particle components has been observed and described, but also the structural segregation, i.e., the separation into areas (grains) with specific crystalline structures. One of the most interesting results is the discovery of a multi-twinned structure and the icosahedral morphology in the final configurations (temperature of 300 K) formed after nanodroplet quenching.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"605 - 618"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752136","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}

{"title":"Influence of Temperature on Surface and Plasmonic Properties of Silver Organosol Films Obtained by Dip-Coating Method","authors":"A. N. Kolodin,&nbsp;V. V. Bocharov,&nbsp;M. M. Syrokvashin,&nbsp;V. S. Sulyaeva","doi":"10.1134/S1061933X26600211","DOIUrl":"10.1134/S1061933X26600211","url":null,"abstract":"<p>Silver organosol films have been produced by the dip-coating method. The organosol has been stabilized with sodium bis(2-ethylhexyl) sulfosuccinate. The films consist of silver nanoparticles (~20 nm) encapsulated in an organic stabilizer layer (~1 μm). Temperature-induced changes in the surface properties of the films have been investigated. Heat treatment in a range from 25 to 500°C causes significant effects. The film surface becomes more hydrophilic. Surface roughness significantly changes from 16 to 172 nm. The observed changes result from stabilizer decomposition and sintering of silver nanoparticles. Meanwhile, the treatment leads to substantial changes in the plasmonic properties of the films. The surface plasmon resonance (SPR) signal intensity decreases by ~53% (from 1.4 to 0.6). The SPR signal wavelength varies over a wide range from 414 to 454 nm. The ability to tune plasmonic properties with temperature is notable. Thus, the obtained films are promising as disposable SPR-based test systems for optical temperature sensing.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"553 - 568"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752138","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}

{"title":"The Role of Halide Anions in the Modulation of Colloidal Chemical Properties of Lysozyme and Its Catalytic Function","authors":"M. G. Chernysheva,&nbsp;V. D. Kriulina,&nbsp;G. A. Badun","doi":"10.1134/S1061933X26600508","DOIUrl":"10.1134/S1061933X26600508","url":null,"abstract":"<p>The effect of F⁻, Cl⁻, Br⁻, and I⁻ halide ions on the behavior of lysozyme in an aqueous−toluene system and the bacteriolytic activity of the enzyme has been studied. The addition of NaF causes lysozyme molecules to form a denser layer at the interfaces due to the stabilization of protein globules and the enhancement of hydrophobic interactions. As a result, the addition of NaF does not affect the enzymatic activity of lysozyme. A different effect has been found upon the addition of NaCl at the same molar concentration. It decreases both adsorption and catalytic activity of the enzyme. The probable reason is the efficient screening of electrostatic interactions, as well as the mutual compensation of hydrophobic attraction and steric repulsion. Chaotropic anions enhance the intermolecular attraction in the adsorption layer, but, at the same time, reduce the catalytic activity. In the case of a strong chaotrope (NaI), this is explained by the destabilization of the network of hydrogen bonds both in the solvent and in the structure of the protein itself, thus increasing the affinity of the protein for the hydrophobic surface; however, it negatively affects its enzymatic function. The key factor determining the catalytic parameters (<i>v</i>_max and <i>K</i>_m) in the presence of cosmotropic anions and a weak chaotrope (NaBr) is the molar concentration of a salt: as it increases, the parameter values decrease. At the same time, the <i>v</i>_max/<i>K</i>_m ratio for these anions remains almost independent of the concentration, while bromide anions appear to be most favorable for maintaining lysozyme activity among the studied salts.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"619 - 628"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751538","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}

{"title":"The Role of the Structural Organization of Sulfur-Containing BODIPY Derivative Ultrathin Films in Supramolecular Recognition of Mercury Cations","authors":"A. V. Berleva,&nbsp;A. M. Ermolaeva,&nbsp;Yu. A. Volkova,&nbsp;S. L. Selektor","doi":"10.1134/S1061933X26600417","DOIUrl":"10.1134/S1061933X26600417","url":null,"abstract":"<p>The paper reports the synthesis of a sulfur-containing amphiphilic derivative, BODIPY B2S, as well as the methods for its purification, and the characteristics of this compound (NMR, IR spectroscopy, mass spectrometry), which can be used as a chelator for mercury(II) cations. The effect of the film structural organization on the efficiency of supramolecular recognition of Hg²⁺ ions has been determined on the basis of the analysis of the structure, properties, and phase behaviour of B2S in ultrathin films on liquid and solid substrates. The structural changes accompanying molecular transitions in planar systems have been studied using Langmuir monolayer compression isotherms, in situ reflection-absorption UV−Vis spectroscopy, optical absorption spectroscopy, and fluorescence spectroscopy. It has been shown that the disruption of dye associates upon complexation leads to the enhancement of monomer emission and alters the fluorescence colour of Langmuir–Blodgett films formed at a high surface pressure. This phenomenon can serve as a convenient diagnostic indicator of mercury cation binding.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"519 - 529"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752139","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}

{"title":"Investigation of the Influence of Oleic and Hydrochloric Acids on the Synthesis of Silver and Gold Nanoparticles in a Span 80/Span 85–n-Decane–Water Reverse Micellar System","authors":"P. S. Popovetskiy,&nbsp;D. D. Burmakina,&nbsp;V. S. Chubar","doi":"10.1134/S1061933X2660020X","DOIUrl":"10.1134/S1061933X2660020X","url":null,"abstract":"<p>The study investigates the effect of the acidity of a hydrogen tetrachloroaurate solution (1−9 М HCl) on the optical properties, hydrodynamic diameter, and electrokinetic potential of gold nanoparticles. In addition, the effect of the molar fraction of oleic acid (up to 80%) on the optical properties, hydrodynamic diameter, and electrokinetic potential of silver nanoparticles is studied. Water-in-oil microemulsions based on sorbitan oleates with different degrees of substitution (Span 80 and Span 85) in an <i>n</i>-decane medium are used as templates for obtaining the nanoparticles. It has been shown that varying the acidity of the aqueous phase when synthesizing gold nanoparticles in reverse micelles of Span 85 enables one to control the ζ-potential of the particles and the fraction of the metal in the sediment. Under these conditions, the sediment is easily peptized by shaking to yield a transparent organosol with a characteristic wine-red color. In the case of Span 80 no such effect is observed. Furthermore, it has been revealed that, during the synthesis of silver nanoparticles, oleic acid additives can be employed to tailor the characteristics of nanoparticles in water-in-oil micellar systems based on Span 80, whereas they exert a negligible effect in the case of Span 85. For Span 80, oleic acid acts as a cosurfactant to form mixed micelles of a larger diameter. In contrast, for Span 85, steric hindrances prevent the formation of mixed micelles, and the addition of oleic acid has virtually no influence on the size of Span 85 micelles.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"593 - 604"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752061","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}

{"title":"Cryostructuring of Polymeric Systems. 73. Character of Variations in the Physicochemical Properties of Poly(Vinyl Alcohol) Cryogels as a Result of Their Incubation in Dimethyl Sulfoxide–Water Mixtures","authors":"L. V. Barannikova,&nbsp;O. Yu. Kolosova,&nbsp;I. A. Malyshkina,&nbsp;V. Ya. Grinberg,&nbsp;N. V. Grinberg,&nbsp;T. V. Burova,&nbsp;V. I. Lozinsky","doi":"10.1134/S1061933X2660034X","DOIUrl":"10.1134/S1061933X2660034X","url":null,"abstract":"<p>Noncovalent poly(vinyl alcohol) (PVA) cryogels (PVACGs) have been formed by freezing of 100 g/L PVA solutions in water or dimethyl sulfoxide (DMSO) at –20°C for 12 h followed by defrosting of the samples at a rate of 0.03°C/min. These cryogels have then been incubated in H₂O/DMSO mixtures with different volume ratios. Dielectric spectrometry has been used to determine the dielectric permittivity of these mixed solvents to characterize their polarity. Changes (relative to the initial cryogels) in the volume, elasticity modulus, and thermophysical fusion parameters have been evaluated for PVACG samples treated with these mixtures. It has been shown that the greatest degree of shrinkage (with a parallel increase in the elasticity and heat endurance) is inherent in cryogels incubated in a mixed solvent medium with ratio DMSO/H₂O = 66.4 : 33.6 (vol %), which corresponds to the optimal composition for the existence of noncovalent H-bonded complexes including one molecule of dimethyl sulfoxide and two molecules of water.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"505 - 518"},"PeriodicalIF":1.6,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751536","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}

{"title":"Development of Immobilized Microbial Beads for Bioremediation of Calcium- and Magnesium-Rich Effluents","authors":"D. R. Poojitha,&nbsp;G. Vijaya Kumar,&nbsp;B. Trilok Chandran,&nbsp;A. N. Prakash,&nbsp;R. Prakash","doi":"10.1134/S1061933X25601581","DOIUrl":"10.1134/S1061933X25601581","url":null,"abstract":"<p>Industrial effluents enriched with calcium (Ca²⁺) and magnesium (Mg²⁺) ions increases water hardness, causing scaling, and contributing to environmental degradation. The present study investigates a development of calcium alginate beads immobilized with ureolytic bacteria <i>B. subtilis</i>, <i>P. aeruginosa</i>, and <i>E. cloacae</i> supplemented with urea. The immobilization matrix having stabilized microbial activity with enhanced ion removal efficiency through microbially induced carbonate precipitation. The composite beads were evaluated for their impact on removal of Ca²⁺, Mg²⁺ ions, reduction in chemical oxygen demand, turbidity, and total hardness from the effluents stream. The results demonstrated over 80% reduction in Ca²⁺ and Mg²⁺ ions, with improved clarity and reduced organic load in treating effluents. Scanning electron microscopy micrographs and Fourier transform infrared spectroscopy spectra of immobilized beads with bacteria confirmed the structural and functional integrity of the beads after encapsulation. The microbial consortium retained high viability and tolerance throughout the treatment process, affirming the robustness of the immobilized system. This eco-friendly methodology holds promise for scalable applications in the remediation of hard water and ion-rich industrial discharges.</p>","PeriodicalId":521,"journal":{"name":"Colloid Journal","volume":"88 4","pages":"679 - 690"},"PeriodicalIF":1.6,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751194","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}