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Pitch deposition at the solid-liquid interface: Effect of surface hydrophobicity/hydrophilicity and cation specificity
Citation
Lee, R and Garnier, G and Lewis, T and Richardson, D and Van De Ven, TGM and Stack, K, Pitch deposition at the solid-liquid interface: Effect of surface hydrophobicity/hydrophilicity and cation specificity, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 338, (1-3) pp. 84-90. ISSN 0927-7757 (2011) [Refereed Article]
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DOI: doi:10.1016/j.colsurfa.2011.08.019
Abstract
The deposition rate of colloidal pitch onto hydrophobic and hydrophilic model surfaces was measured at the solid–liquid interface by impinging jet microscopy (IJM) and the effect of cation specificity in solution on deposition was quantified. On both model surfaces, the pitch deposition was slightly faster
with calcium ions than with magnesium at the same concentration (800 mg/L). This concentration is around twice the critica coagulation concentration.
The rate of colloidal pitch deposition on hydrophobic surfaces was far greater (up to a 2.5 times) than on hydrophilic surfaces for both salts. Contact angle measurements inferred that in the air-surface environment,the hydrophobicity of the surface does not affect its affinity for pitch suggesting molecular mobility
within the pitch colloid. IJM shows variation in the pitch shape on the model surfaces. On hydrophilic surfaces, the pitch particle size for both salts ranges from 0.33 to 0.35 m while for hydrophobic surfaces the particle size is 5 times higher for calcium salt than for magnesium salt. Film thinning or spreading of the pitch particles occurred on the hydrophobic surfaces with calcium and to a lesser extent with magnesium salt.
Item Details
Item Type: | Refereed Article |
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Keywords: | pitch, impinging jet, liquid solid interface, hydrophilic, hydrophobic, deposition, soft colloid, surface, cation |
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: | Lewis, T (Associate Professor Trevor Lewis) |
UTAS Author: | Stack, K (Dr Karen Stack) |
ID Code: | 76636 |
Year Published: | 2011 |
Web of Science® Times Cited: | 10 |
Deposited By: | Chemistry |
Deposited On: | 2012-03-08 |
Last Modified: | 2017-10-25 |
Downloads: | 0 |
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