Preparation of Colloidal Particles: Experimental Design and Characterization
Date Issued
2004
Date
2004
Author(s)
Nacu, Anca-Mihaela
DOI
en-US
Abstract
This thesis is concerned with the preparation and characterization of colloidal particles and the possible use of experimental design in tailoring particles of desired mean particle size and standard deviation. Sub-micron particles of titania and magnesium hydroxide were prepared by sol-gel method and respectively precipitation.
Titania was synthesized from titanium isopropoxide dissolved in alcohol and water in acidic conditions, while magnesium hydroxide was obtained by precipitation of different magnesium salts (MgCl2, Mg(NO3)2 and MgSO4) with sodium hydroxide. For experimental variables for each experiment were chosen and their effects were compared and discussed using an experimental design technique. The variable chosen were [alkoxide]/[water], HCl concentration, feed rate and temperature for titania and the concentrations of salt and base, feed rate and mixing rate for magnesium hydroxide. By using this technique, not only the effect of these variables on the particle size and standard deviation of the particle size could be discussed, but in certain cases the optimum conditions for obtaining monodispersed, small colloidal particles can be determined. The solid particles prepared were characterized by SEM, TEM, XRD, FTIR and TGA.
Some important characteristics of colloidal systems, such as
Subjects
膠體粒子,製備
Colloidal Particles
Type
thesis
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