searching Engineering Collection Change databases

Image of Publication

  • Peer Reviewed
  • Citation only


about this publication

Photometric Dispersion Analyser (PDA) to Quantify Pitch Coagulation Kinetics

63rd Appita Annual Conference and Exhibition, Melbourne 19-22 April 2009

Abstract: 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, steady-state 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.

To cite this article: Lee, Roland; Stack, Karen; Richardson, Des; Lewis, Trevor and Garnier, Gil. Photometric Dispersion Analyser (PDA) to Quantify Pitch Coagulation Kinetics [online]. In: Appita Conference and Exhibition (63rd : 2009 : Melbourne, Vic.). 63rd Appita Annual Conference and Exhibition, Melbourne 19-22 April 2009. Carlton, Vic.: Appita Inc., 2009: 259-265. Availability: <http://search.informit.com.au/documentSummary;dn=734375016756806;res=IELENG> ISBN: 9780975746952. [cited 27 May 16].

Personal Author: Lee, Roland; Stack, Karen; Richardson, Des; Lewis, Trevor; Garnier, Gil; Source: In: Appita Conference and Exhibition (63rd : 2009 : Melbourne, Vic.). 63rd Appita Annual Conference and Exhibition, Melbourne 19-22 April 2009. Carlton, Vic.: Appita Inc., 2009: 259-265. Document Type: Conference Paper, Research ISBN: 9780975746952 Subject: Wood--Chemistry; Aggregation (Chemistry); Coagulation; Wood--Testing; Identifier: Photometric dispersion analyser (PDA) Peer Reviewed: Yes Affiliation: (1) School of Chemistry, University of Tasmania
(2) Research Fellow, University of Tasmania
(3) Senior Specialist, Process Chemistry, Norske-Skog Paper Mills (Australia) Ltd
(4) Senior Lecturer, University of Tasmania
(5) Professor, Monash University

Database: Engineering Collection