Dissemin is shutting down on January 1st, 2025

Published in

Nature Research, Scientific Reports, 1(4), 2014

DOI: 10.1038/srep04584

Links

Tools

Export citation

Search in Google Scholar

The swelling transition of lepidocrocite-type protonated layered titanates into anatase under hydrothermal treatment

Journal article published in 2014 by Huiyu Yuan, Rogier Besselink ORCID, Zhaoliang Liao, Johan E. ten Elshof
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Red circle
Postprint: archiving forbidden
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

The common facets of anatase crystals are the (001) and (101) planes. However, the phase transformation from lepidocrocite-type titanate into anatase by hydrothermal processing yields an anatase microstructure with high concentration of exposed (010) planes. The phase transformation of a lepidocrocite-type protonated layered titanate (HTO) into anatase was studied using XRD, TEM, FTIR, and measurement of pH and zeta potential. It was found that HTO is proton-deficient. The phase transformation process begins after uptake of a sufficient number of protons into the lepidocrocite-type structure. With the uptake of protons new hydroxyl groups form on the internal surfaces of the layered titanate and result in a bilayer state of HTO. The phase transformation reaction is a topotactic dehydration reaction in which anatase forms and water is expelled by syneresis.