Porous monoliths consisting of aluminum oxyhydroxide nanofibrils: 3D structure, chemical composition, and phase transformations in the temperature range 25–1700 °C

Superhydrophobic and luminescent highly porous nanostructured alumina monoliths modified with tris(8-hydroxyquinolinato)aluminium

“…The initial structure of NOA samples can be described as a 3D network consisting of the nanofibrils of aluminium oxyhydroxides. The average size of the nanofibrils is about 5 -7 nm in diameter, and the length is within 100 -300 nm [30]. The studies of the NOA and NOAQ samples, carried out by electron microscopy, confirmed that after the NOAQ modification, the porous mesostructure remains almost unchanged (Figs.…”

“…The monolithic NOA were obtained by the method described previously [30,32]. The details of the synthesis are presented in the supplementary information (Fig.…”

“…In this paper we propose a gas-phase approach to immobilizing the luminescent AlQ 3 complex on the surface of aerogel-like highly porous 3D nanomaterial, consisting of aluminium oxyhydroxides nanofibrils (NOA), the preparation and properties of which were reported in detail by Khodan et al [29][30][31]. Modification of NOA was conducted by treating as-prepared monolithic NOA material with HQ vapors in air.…”

Solvent-Free Synthesized Monolithic Ultraporous Aluminas for Highly Efficient Removal of Remazol Brilliant Blue R: Equilibrium, Kinetic, and Thermodynamic Studies

“…The UPA monolith samples were synthesized via a facile oxidation process according to the previous studies ( Figure S3 ) [ 11 , 12 , 16 , 17 , 22 ]. Briefly, high purity but fragile UPA monolith samples were obtained with a growth rate of ~1 cm·h −1 at room temperature in a humid atmosphere (70–80% RH) by the oxidation of metallic aluminum plates through a liquid layer of mercury–silver amalgam ( Figure S4 ) [ 11 ].…”

“…Briefly, high purity but fragile UPA monolith samples were obtained with a growth rate of ~1 cm·h −1 at room temperature in a humid atmosphere (70–80% RH) by the oxidation of metallic aluminum plates through a liquid layer of mercury–silver amalgam ( Figure S4 ) [ 11 ]. Anhydrous monolithic UPA can be obtained from fragile UPA, converting to amorphous UPA, polycrystalline UPA(γ), UPA(θ), and UPA(α) monolith under 4 h of an isochronous annealing treatment in air at <870, 950, 1150, and 1350 °C, respectively ( Figure S5 ) [ 11 , 12 , 17 , 18 , 22 ]. The mechanical stability of the UPA materials increased with the increasing calcination temperature at the expense of the specific surface area, which decreased from 300 m 2 ·g −1 (raw fragile UPA) to 202 m 2 ·g −1 of UPA(γ), 93 m 2 ·g −1 of UPA(θ), and 6 m 2 ·g −1 of UPA(α) ( Figure S6 ).…”