ИСТИНА

More than 115 years ago, the growth of a fibrous material with a very low bulk density during the oxidation of the surface of a liquid Hg(Al) alloy was first described [1]. In the mid-1990s, the LSPM CNRS proposed a method for the controlled oxidation of Al on the surface of an Hg ~ 1 μm layer, which makes it possible to grow highly porous monolithic nanomaterials with a given cross-sectional shape and consisting of a 3D network of aluminum oxyhydroxide nanofibrils (PMOA) [2]. Regardless, at the Institute of Chemistry. A.N. Frumkin and Leipunsky IPPE were obtained PMOA nanomaterials on the surface of liquid-metal melts Me(Al), Me = Ga, In, Sn, Bi, Pb in humid air [3]. Experimental studies of PMOA materials have shown that they have properties similar to classical aerogels, but fundamentally differ in the synthesis method - a one-stage process in the absence of a liquid-phase gel. It is important to note that the mechanism of nucleation, formation, and growth of aluminum oxyhydroxide nanofibrils on a liquid metal surface in the temperature range from 20 to 670 °C remains a fundamental physicochemical problem that has not been studied to date. The development of a phenomenological quantitative model of the process of formation and 1D growth of aluminum oxyhydroxide nanofibrils during the oxidation of the surface of liquid metal alloys with water vapor is an urgent task, which is being solved in cooperation with the NRC Kurchatov Institute. The second direction of our work is of an applied nature and is associated with the creation of new 3D nanocomposites and functional heterostructures based on PMOA materials with desired physical properties or improved performance characteristics. The main way to control the 3D structure and morphology of nanofibrils is annealing in the range 500 – 1300 °C [4], while changing the overall chemical composition of nanocomposites is achieved by chemical modification of the surface [5] or by filling the free volume of the 3D structure with nanoparticles of oxides, metals, carbides, or carbon. The most promising areas of our work are the creation of optical elements for the THz range [6] and the development of porous filters for the effective destruction of pathogenic microorganisms and the fixation of viral particles. 1. Wislicenus H. Über die faserähnliche gewachsene Tonerde (Fasertonerde) und ihre Oberflächenwirkungen (Adsorption). Zeitschrift für Chemie und Industrie der kolloide Kolloid-Z. 2 (1908) XI-XX. 2. Vignes J-L., Mazerolle L., Michel D. Key Engineering Materials, 132-136 (1997) 432-435. 3. Martynov P.N., Askhadullin R.Sh., Yudintsev P.A., Khodan A.N. New industrial technologies, 4 (2008) 48-52. (in Russian). 4. Khodan A., Nguyen T. H. N., Esaulkov M. et al. J Nanopart Res 20 (2018) 194-201. 5. Khodan A., Kanaev A., Esaulkov M. et al. Nanomaterials 12 (2022) 3591-3613. 6. Stepanenko O., Tartari A., Amamra M., et al. Advanced Device Materials l (2016) 4 93-99.