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无机材料学报

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2007 , Vol. 22 >Issue 1: 59 - 64

DOI: https://doi.org/10.3724/SP.J.1077.2007.00059

研究论文

胶溶-水热晶化过程中纳米TiO2晶粒聚集机理及形貌的研究

  • 吕德义 ,
  • 卞飞荣 ,
  • 许可 ,
  • 郑遗凡 ,
  • 李小年
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  • 浙江工业大学资源与环境催化研究所, 绿色化学合成技术国家重点实验室培育基地, 杭州 310014

收稿日期: 2006-01-06

  修回日期: 2006-05-12

  网络出版日期: 2007-01-20

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Aggregation Behavior and the Resulting Morphology of Nanocrystalline Titania
in Peptization and Hydrothermal Process

  • LU De-Yi ,
  • BIAN Fei-Rong ,
  • XU Ke ,
  • ZHENG Yi-Fan ,
  • LI Xiao-Nian
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  • Resource & Environment Catalysis Institute, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China

Received date: 2006-01-06

  Revised date: 2006-05-12

  Online published: 2007-01-20

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摘要

通过XRD、SEM和动态光散射粒度测定仪(DLS)研究了胶溶及水热晶化过程中纳米TiO2晶粒聚集行为及形貌. 实验结果表明, 在胶溶无定形沉淀过程中所形成的大小为10~15nm的锐钛矿(A)型胶粒或金红石(R)型胶粒(初级粒子)易定向聚集成更大的、具有(30~50)nm×(80~100)nm的次级晶粒. 含有次级晶粒的溶胶前驱液在水热晶化过程中, 次级晶粒发生崩裂并生长成结晶度更高的大小约为10~30nm球形(A型)和大小约为20~60nm棒状(R型)纳米TiO2.

关键词： 二氧化钛; 聚集结晶; 胶溶; 水热晶化

本文引用格式

吕德义 , 卞飞荣 , 许可 , 郑遗凡 , 李小年 . 胶溶-水热晶化过程中纳米TiO2晶粒聚集机理及形貌的研究[J]. 无机材料学报, 2007 , 22(1) : 59 -64 . DOI: 10.3724/SP.J.1077.2007.00059

Abstract

During the process of peptization and hydrothermal crystallization, the aggregation behavior and the resulting morphology of nanocrystalline titania (TiO2) were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and dynamic light scattering (DLS) techniques. The results show that during peptization process the mixture of rutile-type and anatase-type primary particles with 10--15nm in diameter formed by peptizing the precipitated amorphous titania are transformed into rod-like secondary crystalline grains with sizes of (30--50)nm×(80--100)nm through an oriented aggregation mechanism, which obey a crystal face-matching rule. In the process of hydrothermal crystallization under 180℃, however, the rod-like secondary crystalline grains are first broken into nanoparticles with diameter in the range of 10--15nm (namely the same sizes as those of the primary particles), and the formed nanoparticles then grow in hydrothermal solution. The finally resulting particles with the sizes of 10--30nm (spherical anatase) and 20--60nm (rod-like rutile) are found to have a higher crystallization degree than the primary particles formed in the process of peptization.

Key words： titania; aggregation crystallization; peptization; hydrothermal crystallization

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