Direct observation on the Brownian coagulation of PSL particles through optical microscope in the regime near critical coagulation concentration (CCC)

Journal of Colloid and Interface Science
Tomonori Fukasawa, Yasuhisa Adachi

Abstract

Microscopic monitoring of floc structure, floc size distribution and the rate of coagulation was carried out for Brownian coagulation of PSL particles. Experiments were designed for the condition of salt concentration that is slightly below critical coagulation concentration (CCC). The density of the solvent was controlled by using deuterium oxide (D(2)O) to avoid sedimentation. Results are summarized as follows: (i) Near CCC, floc restructuring from the beginning stage of coagulation was evidenced, i.e., the ratio of linear triplet is found to be remarkably reduced as compared with the result obtained for the case of rapid coagulation which was implemented under sufficiently high salt concentration. (ii) The increase of fractal dimension from 1.8 in the case of rapid coagulation to 2.2 was confirmed by the analysis of mass balance using size distribution of flocs. This increment resulted in the decrease of effective excluded volume of flocs. (iii) The rate of coagulation was constant until later stage. This result contrasts to the result of rapid coagulation [T. Fukasawa, Y. Adachi, J. Colloid Interface Sci. 304 (2006) 115].

References

Mar 19, 2004·Journal of Colloid and Interface Science·Daisuke SatoYasuhisa Adachi
Jun 7, 2005·Advances in Colloid and Interface Science·Peter SandkühlerMassimo Morbidelli
Jun 15, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Motoyoshi KobayashiMichal Borkovec
Sep 23, 2006·Journal of Colloid and Interface Science·Tomonori Fukasawa, Yasuhisa Adachi

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Citations

May 30, 2017·Journal of Colloid and Interface Science·Habauka M KwaambwaAdrian R Rennie

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