Light scattering study on the size and structure of calcium phosphate/hydroxyapatite flocs formed in sugar solutions

Greenwood, Judy, Rainey, Thomas J., & Doherty, William O.S. (2007) Light scattering study on the size and structure of calcium phosphate/hydroxyapatite flocs formed in sugar solutions. Journal of Colloid and Interface Science, 306(1), pp. 66-71.

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The formation, flocculation and sedimentation of calcium phosphate particles are among the main physico-chemical reactions that occur during the clarification of cane sugar juice. The mechanisms through which processes occur in juice clarification are still poorly understood. This study (being part of a comprehensive investigation to unravel these mechanisms) reports on the size and structure of calcium phosphate particles and aggregates in water and sugar solutions at 20 degrees Celsius using the small angle laser light scattering technique. The average size of the primary calcium phosphate particles was in the range 10.4±1.1 μm to 17.5±1.2 μm and the scattering exponents, which describe the structure of the calcium phosphate flocs, varied from 1.97 to 2.76. The flocs formed without flocculant are more compact in water than those formed in sugar solution. The compactness of the flocs was also affected by pH of the solution. This effect has been explained by considering the electrical double layer phenomenon.

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ID Code: 14792
Item Type: Journal Article
Refereed: Yes
Keywords: Fractal dimension, Flocs, Calcium phosphate, Flocculation
DOI: 10.1016/j.jcis.2006.10.010
ISSN: 0021-9797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2007 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 09 Sep 2008 00:00
Last Modified: 29 Feb 2012 13:37

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