Dynamics of colloidal pitch adsorption at the solid-liquid interface by surface plasmon resonance
Murray, G and Stack, KR and McLean, D and Shen , W and Garnier, G (2009) Dynamics of colloidal pitch adsorption at the solid-liquid interface by surface plasmon resonance. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 341 (1-3). pp. 127-133. ISSN 0927-7757
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Official URL: http://dx.doi.org/10.1016/j.colsurfa.2009.03.050
This study has two objectives. The first is to investigate the direct adsorption of pitch on pulp fibres as
a papermaking strategy. The second objective is to evaluate the potential of surface plasmon resonance
(SPR) to quantify the adsorption of polydisperse colloids at the solid–liquid interface. The affinity of
colloidal pitch for carboxyl methyl dextran (CMD) surfaces was studied by SPR and optical microscopy.
The dynamics of adsorption and desorption of concentration pulses of colloidal pitch on carboxy methyl
dextranwere followedat the solid–liquid interface by SPR. The parameters investigatedwere temperature,
pitch concentration, colloid size and pitch build-up.
The direct adsorption of pitch onto pulp fibreswas found to be a poor strategy for pitch control in papermaking.
This is because of the very lowchemical affinity of pitch for polysaccharide surfaces. Pitch can be
carried by fibres as the lowdesorption rate might not allowfull desorption during papermaking. Pitch has
a stronger affinity for pitch covered surfaces than for polysaccharides and first adsorbs as colloids—not as
individual fatty/resin acid molecules. Adsorbed pitch particles then serve as nucleation centres for further
pitch adsorption. SPR is a suitable analytical technique to quantify the adsorption dynamics of polydisperse
colloids at the solid–liquid interface. The low signal response measured for the larger colloid was
explained with the bouncing ball mechanism. A fractionation of the polydisperse colloid was observed,
with the small particles being eluded first, followed by the bigger one.
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Surface plasmon resonance
|Deposited By:||Dr Karen R Stack|
|Deposited On:||22 Dec 2009 09:40|
|Last Modified:||22 Dec 2009 09:41|
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