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Study of pitch colloidal stability using a Photometric Dispersion Analyser


Lee, R and Stack, K and Richardson, D and Lewis, T and Garnier, G, Study of pitch colloidal stability using a Photometric Dispersion Analyser, Appita Journal, 63, (5) pp. 387-406. ISSN 1038-6807 (2010) [Refereed Article]


This paper describes the use of a photometric dispersion analyser (PDA) to study and quantify the effect of wood resin preparation and salt on the colloidal stability of wood resin dispersions. The PDA technique has two major benefits over other techniques In that it can quantify the aggregation kinetics under dynamic shear conditions and at low concentrations of colloidal material. It is very sensitive to small changes in the solution and provides Information about the floe structure and homogeneity. To ensure reproducible results when analysing colloidal wood resin dispersions, conditioning of the tubing and a constant flow rate and stirring rate were required. The PDA signal response with time for the wood resin dispersions shows three distinct regions: a growth region, a peak region, and a decay region. The slope of the Initial growth region was used to measure the kinetics of coagulation and to determine the stability ratio, W. The critical coagulation concentration of different salts was also determined. The timeweighted variance of the PDA output showed that potassium salts resulted In more homogeneous aggregates than those formed with the addition of magnesium salts.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Other chemical sciences
Research Field:Other chemical sciences not elsewhere classified
Objective Division:Manufacturing
Objective Group:Wood, wood products and paper
Objective Field:Paper products and pulp
UTAS Author:Lee, R (Mr Roland Lee)
UTAS Author:Stack, K (Dr Karen Stack)
UTAS Author:Lewis, T (Associate Professor Trevor Lewis)
ID Code:67386
Year Published:2010
Web of Science® Times Cited:8
Deposited By:Chemistry
Deposited On:2011-03-03
Last Modified:2011-05-03

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