%0 Journal Article
%T Structural and Morphological Features of Disperse Alumina Synthesized Using Aluminum Nitrate Nonahydrate
%A Ivan F. Myronyuk
%A Volodymyr I. Mandzyuk
%A Volodymyr M. Gun＊ko
%A Volodymyr M. Sachko
%J Archive of "Nanoscale Research Letters".
%D 2016
%R 10.1186/s11671-016-1366-0
%X Transformation of Al(NO3)3ˋ9H2O (upon heating in the range of 20每1200 ∼C) into blends of amorphous and crystalline boehmite (210每525 ∼C), amorphous alumina and crystalline 污-Al2O3 (850 ∼C), and crystalline 汐-Al2O3 (1100 ∼C) was analyzed using X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), infrared (IR) spectroscopy, thermogravimetry, and low-temperature nitrogen adsorption. Boehmite consists of nanoparticles of 6每10 nm in diameter, and part of them has crystalline structure observed in HRTEM images, despite they are XRD amorphous. The nanoglobules are surrounded by amorphous aluminum hydroxide with chains of 每AlO(H)每O每AlO(H)每 of 1每5 nm in length. Heating of samples at 350每525 ∼C gives mesoporous aluminum hydroxide with a relatively narrow pore size distribution. An increase in calcination temperature to 850 ∼C decreases the porosity of alumina composed of amorphous and crystalline (污-Al2O3) phases. Calcination at 1100 ∼C gives 汐-Al2O3 with strongly decreased porosity of aggregates
%K Aluminum nitrate nonahydrate
%K Aluminum hydroxide
%K Alumina
%K Nanoparticle morphology
%K Aggregate texture
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801842/