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超临界CO2流体干燥合成ZrO2气凝胶及其表征
引用本文:梁丽萍,侯相林,吴东.超临界CO2流体干燥合成ZrO2气凝胶及其表征[J].材料科学与工艺,2005,13(5):552-555.
作者姓名:梁丽萍  侯相林  吴东
作者单位:1. 太原科技大学,材料科学与工程学院,山西,太原,030024;中国科学院,煤转化国家重点实验室,山西,太原,030001
2. 中国科学院,煤转化国家重点实验室,山西,太原,030001
摘    要:以无机盐为原料,采用沉淀法结合超临界CO2流体干燥技术成功地制备了ZrO2气凝胶.借助TG/DSC、XRD、TEM、DLS以及N2物理吸附等手段对其性能进行表征.结果显示,超临界CO2流体干燥可以有效地防止干燥过程中胶体粒子之间的硬团聚作用,在基本保持湿凝胶网络结构的情况下实现液相的脱除,从而使合成的ZrO2具有高比表面积和大孔体积等特点.此外,样品的TEM和DLS分析显示,纳米ZrO2颗粒首先形成具有空间网络结构的簇团,尺寸为数百个纳米的簇团堆积形成ZrO2气凝胶;气凝胶的空间网络结构特征在中等温度的热处理过程中不会遭到完全破坏.

关 键 词:二氧化锆  气凝胶  超临界CO2流体干燥  动态光散射  物理吸附  超临界  流体干燥  合成  气凝胶  表征  technology  drying  fluid  supercritical  aerogels  破坏  完全  处理过程  温度  结构特征  空间网络结构  尺寸  簇团  颗粒  纳米
文章编号:1005-0299(2005)05-0552-04
收稿时间:2003-12-04
修稿时间:2003年12月4日

Synthesis of ZrO2 aerogels by supercritical CO2 fluid drying technology
LIANG Li-ping,HOU Xiang-lin,WU Dong.Synthesis of ZrO2 aerogels by supercritical CO2 fluid drying technology[J].Materials Science and Technology,2005,13(5):552-555.
Authors:LIANG Li-ping  HOU Xiang-lin  WU Dong
Affiliation:1. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Heavy Machinery Institute, Taiyuan 030024, China ; 2. State Key Laboratory of Coal Conversion, Chinese Academy of Sciences, Taiyuan 030001,China
Abstract:With low - cost inorganic salts as the starting materials, ZrO2 aerogels have been synthesized by the common precipitation route, coupled with supercritical CO2 fluid - drying technology to remove the solvent entrapped in the gelatinous precipitates. The aerogels were characterized by TG/DSC thermal analysis, X - ray diffraction, transmission electron microscopy, dynamic light scattering and nitrogen adsorption. Experiments revealed that supercritical CO2 fluid -drying could effectively alleviate the hard agglomeration of grains during the drying process, hence the morphology of the powder largely retained the network texture of the original gel. The resulting ZrO2 aerogels were composed of spherical nanoparticles of 3 - 25nm, which constituted the soft clusters with hydrodynamic diameter of several - hundred nanometers. Moreover, the aerogels were characterized by high specific surface area and large pore volume attributed to meso - to macropores and a negligible contribution of microporosity.
Keywords:zircornia  uhrafine powder  CO2 supercritical fluid drying  dynamic light scattering  physical adsorption
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