D. Mendeleyev University of Chemical Technology of Russia

Fashion Technology & Textile Engineering introduces pioneering technologies, and improved understanding of textile materials, processes, chemistry and systems. It will encourage interdisciplinary research which will share newly developed technology, theory and techniques in the fashion and textile

Porous highly cross-linked polymer (PIP) was synthesized by a polycondensation reaction between hexachlorocyclotriphosphazene and piperazine. The obtained polymer has a surface area of 76.9 m2/g and a mesoporous structure. After carbonization, the obtained product (PIP-C) has a surface area of 177 m2/g. The obtained carbon product contained nitrogen and phosphorus heteroatoms, which leads to a higher specific capacitance (155.6 F/g) and catalytical activity in the electroreduction of oxygen (15.9 A/g). This work shows the possibility of the use of such porous phosphazene polymers as precursors for heteroatom-doped carbon materials, which might be used in electrochemical devices like electrodes for supercapacitors or metal-free electrocatalysts in fuel cells.

High-temperature proton exchange membrane systems (HT-PEM) based on polybenzimidazole (PBI) membranes are a promising technology offering significant advantages over their low-temperature counterparts. A key challenge limiting its long-term durability is the leaching of phosphoric acid (PA) from the membrane during operation. This work introduces, for the first time, the strategy of modifying polybenzimidazole (PBI) membranes with amino-functionalized porous aromatic frameworks (PAF-20-NH2) to fundamentally enhance their PA retention and operational stability, a critical challenge for high-temperature PEM technologies. We propose that the synergistic combination of the framework’s nanoscale porosity and the specific interaction of its amino groups create an unprecedented network for acid immobilization via reinforced hydrogen bonding. A comprehensive study of the membranes’ physicochemical and structural properties reveals that PAF-20-NH2 modification results in a significant and quantitatively demonstrated improvement in acid retention capacity, directly translating into a notable increase in proton conductivity compared to both pristine PBI and membranes modified with the non-functionalized PAF-20. These findings establish a new, highly effective pathway for the rational design of next-generation high-performance PBI-based membranes.

This study investigated the possibility of generating cavitation effects in microfluidic reactors at sharp pressure drops (from 10 to 1 atm.) without the use of ultrasonic sources. The calculations revealed that with the parameters characteristic of microfluidic systems (channel diameter of 1 mm, flow rate of 100 ml/h), an energy dissipation rate of approximately 3.225 W/cm² was achieved. This value exceeds the known cavitation threshold for aqueous solutions and is within the interval characteristic of cavitation induced by high-frequency sources. A decrease in the diameter of the channel contributes to an increase in specific power, thereby increasing the probability of cavitation. The dependencies of the kinetics of the first-order reaction on the intensity of cavitation were determined. At α = 0.8 (cavitation amplification coefficient selected from the literature), the velocity constant increases from 0.010 to 0.0358 s –1 , which leads to a significant reduction in the time required to achieve a given degree of transformation.

ABSTRACT This work describes the thermal synthesis and structural optimization of Fe3BO 6 nanoparticles (NPs) as boron‐containing precursors for nanostructured Nd–Fe–B permanent magnets. Amorphous Fe 3 BO 6 NPs were obtained by chemical precipitation from FeCl 3 /NaBH 4 solutions and crystallized by controlled heat treatment. Phase evolution was monitored by TG–DSC, XRD, and FTIR, while SEM, TEM, and DLS characterized morphology and size distribution. Annealing at 530°C yields Fe 3 BO 6 ·3 α ‐Fe 2 O 3 NPs with a narrow size distribution (50 ± 10 nm) and reduced aggregation, suitable for chemically assisted nanostructuring. These optimized NPs, combined with Nd 2 O 3 and Fe 2 O 3 , were used in a reduction–diffusion route to prepare Nd–Fe–B alloys with different nominal compositions. The best composition, Nd 16 Fe 76 B 8 , forms single‐phase Nd 2 Fe 14 B and exhibits high coercivity (Hc = 8439 Oe) with stable remanence, surpassing several reported chemically synthesized Nd–Fe–B systems. The use of simple inorganic precursors, moderate temperatures, and controlled nanoscale structure makes this Fe 3 BO 6 ‐based route attractive for scalable, resource‐efficient production of powders for advanced bonded magnets and other high‐performance applications.