Light Scattering Method for the Study of Close Range Structure in Coagulating Dispersions of Equal Sized Spherical Particles

Giles, Dennis; Lips, Alexander

dc.contributor.author	Giles, Dennis
dc.contributor.author	Lips, Alexander
dc.date.accessioned	2025-11-17T05:08:50Z
dc.date.available	2025-11-17T05:08:50Z
dc.date.issued	1978
dc.identifier.uri	http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/20056
dc.description	A light scattering method is proposed for studies of close range structure in flocs. This involves an analysis of the changes in the light scattered from coagulating dilute dispersions of equal sized spherical particles. From studies of initial coagulation behaviour, the size of particles, strictly their hard core interaction diameter, and the radial distribution function relating to particle contact can be determined. An approximate insight can be gained into average cumulative co-ordination numbers of particles in growing flocs. Studies of the rapid flocculation of polystyrene particles, in the joint presence of nonionic dextran flocculant and simple electrolyte coagulant, indicate close packed structure at low ionic strength and “ liquid ” floc arrangements at higher electrolyte concentrations. This suggests a weakening of the hard core interaction on addition of electrolyte which is likely to be a consequence of shielding of the electrostatic repulsion between the particles. Prolonged storage of the latex particles at 60’C or adsorption of anionic surfactant can lead to a strengthening of hard core interactions. The method can be used to size spherical particles of non-uniform refractive index and has been exploited in measurements of the thickness of adsorbed polymer and surfactant layers. It has indicated that storage at 60°C can increase the size of polystyrene particles (of unswollen diameter 207 nm) by 4±2 nm.	en_US
dc.language.iso	en	en_US
dc.publisher	Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1978, 74 (3)	en_US
dc.subject	Chemistry	en_US
dc.subject	Light scattering method	en_US
dc.subject	Coagulating dispersions	en_US
dc.subject	Spherical particles	en_US
dc.title	Light Scattering Method for the Study of Close Range Structure in Coagulating Dispersions of Equal Sized Spherical Particles	en_US
dc.type	Article	en_US