Colloid Journal
ISSN (print): 0023-2912
Media registration certificate: № 0110217 от 08.02.1993
Founders: Russian Academy of Sciences, Institute of Physical Chemistry of RAS
Editor-in-Chief: Boinovich Ludmila Borisovna, academician RAS, Doctor of Sc.
Frequency / Access: 6 issues per year / Subscription
Included in: White list (2nd level), Higher Attestation Commission list, RISC
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Vol 87, No 5 (2025)
- Year: 2025
- Published: 15.09.2025
- Articles: 7
- URL: https://journals.rcsi.science/0023-2912/issue/view/24179
Articles
PHASE BEHAVIOR OF FISH GELATIN–AGAR AQUEOUS MIXTURES
Abstract
The interaction of fish gelatin and agar in the bulk of the aqueous phase with the formation of supramolecular protein–polysaccharide complexes was studied using spectroscopy (IR Fourier, UV), turbidimetry, quasi-elastic laser light scattering and scanning electron microscopy. The influence of the structure of gelatin (content of amino acid residues), the agar/fish gelatin w/w ratio Z and the medium (pH, ionic strength I) on the boundaries of the regions of stoichiometric and non-stoichiometric complexes formation, the size and ζ-potential of particles and, consequently, the phase behavior of the aqueous mixture (i.e., colloidal solution) of biopolymers was considered. Phase diagrams of aqueous mixtures of fish gelatin and agar were constructed in the coordinates Z – characteristic pH, as well as I – characteristic pH. The regions of different phase behavior of the systems are determined, such as a single-phase solution of non-complexed biopolymers, a dispersion of fish gelatin–agar complexes, the region of the beginning of the separation of coacerates from the dispersion, and the region of complete separation of the coacervate phase and supernatant. It is shown that the formation of fish gelatin–agar complexes affects the microstructure of gels formed during cooling of aqueous mixtures of biopolymers.
Colloid Journal. 2025;87(5):469–488
469–488
INFLUENCE OF MECHANICAL ACTIVATION ON THE STRUCTURE AND SORPTION PROPERTIES OF HYDROLYTIC LIGNIN, KAOLIN AND COMPOSITES BASED THEREON
Abstract
An express method of solvent-free mechanochemistry using fine grinding in air for 3 and 6 minutes in a mill (0.94 kW; 26,000 rpm) is employed to targetedly change in the structure of kaolin and increase its sorption capacity. During the same process, kaolin is modified together with hydrolytic lignin to hydrophobize its surface and improve its sorption properties. The influence of mechanical activation on the structure and properties of kaolin, hydrolytic lignin and their composites based with different component ratios is studied using electron microscopy, X-ray diffraction, infrared spectroscopy, low-temperature nitrogen adsorption and UV absorption spectroscopy. The dense structure of kaolinite remains preserved, hydrogen bonds in hydrolytic lignin are ruptured and the number of carbonyl groups increases, and fragments of natural polymer are grafted to kaolinite. It has been found that an aggregation-agglomeration microstructure is formed in the composites. Kaolin, as well as the composite of kaolin and hydrolytic lignin with a mass ratio of 10 : 1, treated with a mechanical energy dose of 0.83 kJ · g−1, exhibited significant changes in structure and demonstrated relatively high sorption characteristics. The Brunauer-Emmett-Teller specific surface area of this sorbents is ~ 16 m2 · g−1, the adsorption of bovine serum albumin are 83.63 and 44.10 mg · g−1, respectively. Thus, the dry mechanical activation in air under ‘mild’ conditions makes it possible to increase the sorption of bovine serum albumin of kaolin by 104%.
Colloid Journal. 2025;87(5):489–505
489–505
ON SOME FEATURES OF THE INTERACTION OF ULTRASMALL GOLD NANOPARTICLES WITH LIQUID-CRYSTALLINE DNA MICROPARTICLES
Abstract
The features of the interaction of ultrasmall gold nanoparticles (GNPs) synthesized via Duff method with particles of optically active liquid-crystalline dispersions (LCDs) of DNA formed at varying concentrations of NaCl and polyethylene glycol were studied. It was shown that the GNPs differently affect the LCDs with positive and negative orientation of the anomalous circular dichroism (CD) signal. Apparently, this is in a measure due to the various conformation of DNA molecules that form the corresponding dispersed particles. The kinetic aspects of the interaction of GNPs with DNA LCDs and the features of "loading" ultradispersed gold into the LCD particles are also discussed.
Colloid Journal. 2025;87(5):506–526
506–526
LOW-TEMPERATURE MAGNETIC FLUIDS BASED ON ALCOHOL AND SALT SOLUTIONS, STABILIZED BY A DOUBLE LAYER WITH A NON-IONOGENIC SURFACTANT TWEEN 20
Abstract
The samples of magnetic liquid stabilized by a double layer of surfactant in water using non-ionogenic stabilizer TWEEN 20 (Polysorbate 20) as the second layer were synthesized. The rheological properties of the synthesized samples depending on their concentration were investigated. In contrast to liquids with dissociated surfactant, the viscosity of the magnetic liquid decreases faster with temperature increase than the viscosity of the base medium (water). The main advantage of using non-ionogenic surfactant is the possibility of synthesizing low-temperature magnetic liquids based on water-alcohol mixtures and aqueous salt solutions. Fluids stabilized by TWEEN 20 in ethylene glycol and propylene glycol solutions retain mobility up to temperatures –40°C and –50°C. When calcium chloride CaCl2 solution was used as a base medium, the test sample of the fluid retained performance up to temperature –30°C. Magnetic liquids based on alcohol and salt solutions can be indispensable in the fields of engineering, where strict requirements are made to their fire and environmental safety. Chemical passivity of particles stabilized by TWEEN 20 makes their application in biology and medicine possible.
Colloid Journal. 2025;87(5):527–536
527–536
METAL-BASED INKS FOR PRINTED ELECTRONIC COMPARISON OF THE MAIN APPROACHES TO OBTAIN
Abstract
Printed electronic is an area of modern materials science that is undergoing rapid development. The use of printing equipment has the potential to significantly simplify and reduce the cost of obtaining passive and active electronic components. Dozens of reviews and hundreds of scientific articles are published annually in this field. However, it should be noted that the consumer characteristics of ink formulations for printed electronic are, to a certain extent, compromises. Improving one property usually results in a deterioration of another. For example, increasing the content of the main component usually leads to a decrease in stability. This review paper will compare two main approaches to obtaining metal-based inks, which can be conventionally called “organometallic” and “colloidal,” examine their strengths and weaknesses, and assess the prospects for further development in printed electronic.
Colloid Journal. 2025;87(5):537–562
537–562
EFFECT OF ANIONIC SURFACTANT ADDITIVES ON THE SURFACE CHARACTERISTICS OF SOLUTIONS OF DICATIONIC DIIMIDAZOLIUM SURFACTANTS WITH SHORT SPACERS FRAGMENTS
Abstract
Tensionetric and dilatational rheological characteristics of solutions of dicationic diimidazolium surfactants mixtures with extremely short spacer fragments and anionic surfactants (sodium dodecyl sulfate, sulfonol, sodium 3-laureth sulfate) at the interface with air were studied using the pendant drop and oscillating drop methods. The nature of interaction between dicationic and anionic surfactants depends on the structure of the anionic surfactant molecules. The possibility of forming strong complexes between a dicationic surfactant with 4 methylene groups in the spacer fragment and sodium dodecyl sulfate with the component ratio close to 1 : 1 was shown. It was found that the resulting complexes are stable in the neutral and slightly acidic pH range.
Colloid Journal. 2025;87(5):563–574
563–574
LUMINESCENT NANOPARTICLES OF POLYELECTROLYTE COMPLEX OF CHITOSAN WITH CARRAGEENAN AS PERSPECTIVE MULTIFUNCTIONAL VANCOMYCIN DELIVERY SYSTEMS
Abstract
Nanoparticles of a polyelectrolyte complex of chitosan and κ-carrageenan containing core–shell quantum dots of CdS/ZnS were obtained and characterized as potential biocompatible luminescent delivery systems for the antibiotic vancomycin with an encapsulation efficiency of 95–97%. Quantum dots were obtained by a colloidal synthesis method and hydrophilized with mercaptopropionic acid. The effect of vancomycin encapsulated in particles of the polyelectrolyte complex on the luminescent properties of CdS/ZnS quantum dots was studied. The capabilities of the synthesized quantum dots as analytical nanosensors for determine the incorporation and release of vancomycin from the developed carriers based on their luminescence quenching were demonstrated. The binding of vancomycin to albumin as a model of blood protein was studied, the composition of the complex ([vancomycin]: [albumin] = 1.0 : 2.0) and its stability constant (βκ = 6.0 ⋅ 104 M−1) were determined. Analysis of kinetic data on the release of vancomycin from polymer carriers under in vitro conditions into albumin and tris-buffer solutions within the framework of the Korsmeyer–Peppas mathematical model showed that the release of the antibiotic is controlled by both diffusion and relaxation of the polymer matrix.
Colloid Journal. 2025;87(5):575–590
575–590