Synthesis and characterization of hydrothermally obtained colloidal pseudoboehmite/boehmite

Abstract

In this paper, the synthesis and structure of pseudoboehmite/boehmite obtained by hydrothermal method is described. The SO(4)(2-)ions were used for the colloid stabilization. The influence of the ageing time on the particle self-assembling from the fibers to the spherical shape of agglomerates has been investigated by using AFM.. The started form of the particles immediately after hydrothermal treatment was shown in the form of very elongated fibers with length between 400 and 1000 nm, while the sizes of the spherical particles obtained after ageing during one month were between 140 and 220 nm. The mechanism of obtaining and self-assembling of the fibers into spherical particles has been observed additionally. The TGA and DTA analysis were also done for investigations of the phase transformations during heating treatment of the pseudoboehmite/boehmite samples.