000916426 001__ 916426 000916426 005__ 20230224084255.0 000916426 0247_ $$2doi$$a10.3390/nano12203591 000916426 0247_ $$2Handle$$a2128/33544 000916426 0247_ $$2pmid$$a36296780 000916426 0247_ $$2WOS$$aWOS:000875933400001 000916426 037__ $$aFZJ-2022-06226 000916426 082__ $$a540 000916426 1001_ $$00000-0002-1158-1491$$aKhodan, Anatole$$b0$$eCorresponding author 000916426 245__ $$aEffects of Surface Chemical Modification by Ethoxysilanes on the Evolution of 3D Structure and Composition of Porous Monoliths Consisting of Alumina Hydroxide Nanofibrils in the Temperature Range 25–1700 °C 000916426 260__ $$aBasel$$bMDPI$$c2022 000916426 3367_ $$2DRIVER$$aarticle 000916426 3367_ $$2DataCite$$aOutput Types/Journal article 000916426 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1673594696_23970 000916426 3367_ $$2BibTeX$$aARTICLE 000916426 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000916426 3367_ $$00$$2EndNote$$aJournal Article 000916426 520__ $$aBulk nanomaterials with an open porosity offer exciting prospects for creating new functional materials for various applications in photonics, IR-THz optics, metamaterials, heterogeneous photocatalysis, monitoring and cleaning toxic impurities in the environment. However, their availability is limited by the complexity of controlling the process of synthesis of bulk 3D nanostructures with desired physicochemical and functional properties. In this paper, we performed a detailed analysis of influence of a silica monolayer chemically deposited on the surface of a monolithic ultraporous nanostructure, consisting of a 3D nanofibril network of aluminum oxyhydroxide, on the evolution of structure and morphology, chemical composition and phase transformations after heat treatment in the temperature range of 20−1700 °C. The experimental results are interpreted in the framework of a physical model taking into account surface and volume mass transport and sintering kinetics of nanofibrils, which made it possible to estimate activation energies of the surface diffusion and sintering processes. It is shown that the presence of a surface silica monolayer on the surface affects the kinetics of aluminum oxyhydroxide dehydration and inhibits diffusion mass transfer and structural phase transformations. 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