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Small Angle Laser Scattering Investigation of the Aggregation of Colloidal Suspended Particles

Lu Shengguo Zhang Liangying Yao Xi (Electronic Materials Research Laboratory,Xi'an Jiaotong University,710049)  
Zr and Pb,Ti hydrous oxide particles prepared by controlled hydrolysis of alkoxide,ther-mal decomposition of metallic chelate,and Sol-gel process,are reported in this paper.TEMand Small-Angle Laser Scattering(SALS)are used to investigate the aggregation characteris-tics of particles.Experimental results indicate that,the dimension of aggregates of Zr hydrousoxide particles is D_f=2.29,which is close to the fractal dimension of the DLA (Diffused LimitedAggregation) model simulated by computer(D_f=2.50);the dimension of aggregates of Pb,Tihydrous oxide particles is D_f=1.70,which is close to the result of CCA (Cluster-Cluster Ag-gregation) model(D_f=1.80).While the fractal dimension of PbTiO_3 crystallites dispersed inepoxy resin is D_f=0.775,which is almost linear(D_f=1).By contrast of aggregates morphalogyof particles with the simulated results by computer,it seems that the morphology of particlesgenerally agrees with the random aggregation models (with fractal dimension) except for theregular structure(with Euclid dimension).The aggregates can be said to be a kind of fractal.
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