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Photometric Dispersion Analyser (PDA) to quantify pitch coagulation kinetics


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Lee, R, Stack, KR, Richardson, DE, Lewis, T and Garnier, G 2009 , 'Photometric Dispersion Analyser (PDA) to quantify pitch coagulation kinetics', paper presented at the 63rd Appita Annual Conference and Exhibition, 19-22 April 2009, Melbourne, Victoria.

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The kinetics of coagulation/aggregation of the wood
resin colloids under varying conditions of shear and
ionic strength were investigated using a Photometric
Dispersion Analyser (PDA) 2000. The PDA 2000
measures the turbidity variations of a moving
colloidal suspension and monitors its
aggregation/dissociation rate in terms of a stability
ratio (W).
This paper describes the use of the PDA 2000 to
quantify and mathematically model the coagulation
of wood resin colloids under dynamic shear
conditions The PDA signal with time curves show
several characteristic features: growth region, steadystate
region, peak region, and lower steady-state
region. These regions give information into the floc
variation and growth. The slope of the initial growth
region is a measure of the kinetics of coagulation.
This is used to assess the validity of the Derjaguin,
Landau, Verwey and Overbeek theory (DLVO
theory) and the Reerink and Overbeek theory. The
time-weighted ratio variance provides an indication
of the severity of floc/aggregate break up as well as a
measure of floc/aggregate structural homogeneity.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Lee, R and Stack, KR and Richardson, DE and Lewis, T and Garnier, G
Journal or Publication Title: Proceedings of 63rd Appita Annual General Conference
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