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Crystal phase evolution of TiO<inf>2</inf> nanoparticles with reaction time in acidic solutions studied via freeze-drying method

Shin, H and Jung, HS and Hong, KS and Lee, JK (2005) Crystal phase evolution of TiO<inf>2</inf> nanoparticles with reaction time in acidic solutions studied via freeze-drying method. Journal of Solid State Chemistry, 178 (1). 15 - 21. ISSN 0022-4596

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Abstract

The crystal phase evolution of TiO2 nanoparticles, during hydrolysis and condensation of titanium tetraisopropoxide, was quenched at various reaction times by a freeze-drying method, followed by various characterizations. Three types of solutions with different acid input times were studied: (1) addition in infinite time (no addition), (2) addition at 24 h after the hydrolysis/condensation reaction started, and (3) addition from the beginning of the reaction. The acid-free solution yielded amorphous TiO 2, which transformed to anatase very slowly. The acid input in 24 h resulted in a fast transformation of amorphous to a metastable anatase having a highly distorted atomic arrangement: thereby its transformation to a more stable phase, rutile, was suitable. The acid addition from the beginning of the reaction yielded the formation of a relatively stable anatase from the hydrolysis seed, thereby the subsequent transformation to rutile was sluggish. © 2004 Elsevier Inc. All rights reserved.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Shin, H
Jung, HS
Hong, KS
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, or Units > Petersen Institute of NanoScience and Engineering
Date: 1 January 2005
Date Type: Publication
Journal or Publication Title: Journal of Solid State Chemistry
Volume: 178
Number: 1
Page Range: 15 - 21
DOI or Unique Handle: 10.1016/j.jssc.2004.09.035
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0022-4596
Date Deposited: 17 Nov 2014 17:33
Last Modified: 05 Feb 2019 19:55
URI: http://d-scholarship.pitt.edu/id/eprint/23511

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