Information Services banner Edinburgh Research Archive The University of Edinburgh crest

Edinburgh Research Archive >
Physics, School of  >
Physics thesis and dissertation collection >

Please use this identifier to cite or link to this item:

This item has been viewed 857 times in the last year. View Statistics

Files in This Item:

File Description SizeFormat
Pirie1995Sect1-2.pdfChapters 1 & 22.29 MBAdobe PDFView/Open
Pirie1995Sect3.pdfChapter 31.58 MBAdobe PDFView/Open
Pirie1995Sect4.pdfChapter 413.32 MBAdobe PDFView/Open
Pirie1995Sect5.pdfChapter 51.23 MBAdobe PDFView/Open
Pirie1995Sect6.pdfChapter 61.05 MBAdobe PDFView/Open
Title: A light scattering study of colloid-polymer mixtures
Authors: Pirie, Angus D
Supervisor(s): Pusey, Peter
Poon, Wilson
Issue Date: Dec-1995
Publisher: University of Edinburgh; College of Science & Engineering; School of Physics
Abstract: A detailed light scattering study of non-equilibrium states found in a model colloid-polymer mixture is presented. Conventional light scattering is used to examine the average structure of the phase, over a wide range of wavevectors. For all non-equilibrium samples a 'ring' of scattered radiation is found at small angles, whose temporal evolution is used to investigate aggregation kinetics and the growth of structure. For low concentrations of colloid and just sufficient polymer to induce non-equilibrium behaviour a small angle ring is observed after a initial 'lag time', which remains stationary and brightens rapidly, behaviour reminiscent of classical nucleation. At higher colloid concentrations one finds a continuously collapsing and brightening ring, similar to that found in classical spinodal decomposition. Upon the addition of further polymer the system gels and the small angle ring becomes arrested at a finite wavevector. Direct visual observation of these different regimes is also presented, via video-enhanced microscopy and direct time-lapse video recordings, to complement the light scattering data. The particle dynamics within the aggregates are measured using dynamic light scattering, The results obtained suggest that the onset of non-equilibrium behaviour is caused by the presence of a metastable gas-liquid phase boundary, which can be calculated using a recently-developed mean-field theory.
Appears in Collections:Physics thesis and dissertation collection

Items in ERA are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! Unless explicitly stated otherwise, all material is copyright © The University of Edinburgh 2013, and/or the original authors. Privacy and Cookies Policy