Effects of mechanical activation of inorganic gels on their thermal behavior. 1. Crystallization process of titania gels

Tetsuhiko Isobe, Mamoru Senna

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The influence of mechanical pretreatment on the crystallization from amorphous titania hydrogel to anatase was studied. The temperature of crystallization, Tcrys, determined by the DTA exothermic peak, decreased by 18 and 44 K on grinding for 3 hr by the rotation and vibration ball-mill, respectively. Preliminary ordering of anatase in ground gels was detected by Raman spectroscopy and selected area electron diffractometry, before any X-ray diffraction peak appeared. It is suspected that the decrease in Tcrys by mechanical activation is attributed to the above precursory ordering. By applying mechanical stress, the sudden weight loss was observed at Tcrys. This suggests that a small amount of hydroxyl groups and NH+4 may block the long-range ordering of TiO6 structural units.

Original languageEnglish
Pages (from-to)358-367
Number of pages10
JournalJournal of Solid State Chemistry
Volume93
Issue number2
DOIs
Publication statusPublished - 1991

Fingerprint

Crystallization
anatase
Titanium dioxide
Gels
titanium
Titanium
Chemical activation
gels
activation
crystallization
Ball mills
grinding
Hydrogels
pretreatment
Differential thermal analysis
Raman spectroscopy
balls
thermal analysis
Hydrogel
X ray diffraction

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

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abstract = "The influence of mechanical pretreatment on the crystallization from amorphous titania hydrogel to anatase was studied. The temperature of crystallization, Tcrys, determined by the DTA exothermic peak, decreased by 18 and 44 K on grinding for 3 hr by the rotation and vibration ball-mill, respectively. Preliminary ordering of anatase in ground gels was detected by Raman spectroscopy and selected area electron diffractometry, before any X-ray diffraction peak appeared. It is suspected that the decrease in Tcrys by mechanical activation is attributed to the above precursory ordering. By applying mechanical stress, the sudden weight loss was observed at Tcrys. This suggests that a small amount of hydroxyl groups and NH+4 may block the long-range ordering of TiO6 structural units.",
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AU - Isobe, Tetsuhiko

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AB - The influence of mechanical pretreatment on the crystallization from amorphous titania hydrogel to anatase was studied. The temperature of crystallization, Tcrys, determined by the DTA exothermic peak, decreased by 18 and 44 K on grinding for 3 hr by the rotation and vibration ball-mill, respectively. Preliminary ordering of anatase in ground gels was detected by Raman spectroscopy and selected area electron diffractometry, before any X-ray diffraction peak appeared. It is suspected that the decrease in Tcrys by mechanical activation is attributed to the above precursory ordering. By applying mechanical stress, the sudden weight loss was observed at Tcrys. This suggests that a small amount of hydroxyl groups and NH+4 may block the long-range ordering of TiO6 structural units.

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