Controlled Aggregation of Colloidal Particles for Toner Applications

Turner, A. J. and Nair, S. and Lai, Z. and Cheng, C. M. and Bhatia, S. R.. (2011) Controlled Aggregation of Colloidal Particles for Toner Applications. Journal of Applied Polymer Science, 122 (2). pp. 1358-1363. ISSN 0021-8995

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Micrometer-sized particles were formed by controlled aggregation of carboxylated polystyrene colloidal spheres having a mean diameter of about 200 nm with a commercial cationic coagulant. To identify the parameters governing the size and structure of the aggregates, the aggregate size distribution was studied over a period of time with dynamic light scattering. The effect of the particle concentration, pH, and ionic strength on the aggregation behavior was investigated. The coagulant concentration used for present studies was 5 parts per hundred on the basis of the polystyrene particles and the particle concentrations used were 10-15%. The particle size distribution for the latex suspensions was also investigated with a 10% aluminum sulfate [Al(2)(SO4)(3)center dot 14H(2)O] solution as a model coagulant. With the commercial coagulant, aggregation was found to be slower at lower pH than at neutral pH. At pH 6, the particles started to aggregate within minutes and form aggregates of about 1000 nm. We expected that lowering the pH would reduce interparticle repulsive forces and enhance the collision efficiency. However, at a lower pH of 2, the aggregation process slowed down. Increasing the ionic strength at neutral pH led to a broader aggregate size distribution, and the population of larger aggregates increased. The suspensions with the model coagulant showed similar behavior. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 1358-1363, 2011

Item Type: Article
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanoparticles
Nanomanufacturing Processes > Self Assembly > Colloidal crystallization
Collections: Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing
Depositing User: Robert Stevens
Date Deposited: 19 Apr 2012 21:04
Last Modified: 02 May 2012 17:31

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