The effect of external electric fields during flame synthesis of titania

被引：31

作者：

Kammler, HK

Jossen, R

Morrison, PW

Pratsinis, SE

Beaucage, G

机构：

[1] ETH, Inst Proc Engn, Dept Mech & Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland

[2] Univ Cincinnati, Dept Mat Sci & Engn, Cincinnati, OH 45221 USA

来源：

POWDER TECHNOLOGY | 2003年 / 135卷

基金：

美国国家科学基金会;

关键词：

growth of nanoparticles; titania; electric field; precision control; particle size distribution; thennophoretic sampling;

D O I：

10.1016/j.powtec.2003.08.023

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The evolution of nanoparticle growth inside electrically assisted flames is studied by thermophoretic sampling (TS) followed by transmission electron microscopy (TEM) and statistical evaluation of the counted images. Up to 11 g/h titania particles are produced by titanium tetraisopropoxide (TTIP) oxidation in a CH4/O-2 premixed flame. An electric DC-field of 1.5 kV/cm is established across the flame with two plate electrodes. At each TS location, the flame temperature is measured by Fourier transform infrared (FTIR) spectroscopy while the product powder is analyzed with nitrogen adsorption (BET), X-ray diffraction (XRD), TEM and small-angle X-ray scattering (SAXS) that is used to estimate the extent of agglomeration. External electric fields decrease most dramatically the flame temperature downstream of the electric field controlling particle size, crystallinity and morphology and contribute to the formation of soft agglomerates. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：310 / 320

页数：11

共 27 条

[1] Monitoring the flame synthesis of TiO2 particles by in-situ FTIR spectroscopy and thermophoretic sampling [J].