Probing the stability of sterically stabilized polystyrene particles by centrifugal sedimentation

Yow, Huai Nyin and Biggs, Simon (2013) Probing the stability of sterically stabilized polystyrene particles by centrifugal sedimentation. Soft Matter, 9 42: 10031-10041. doi:10.1039/c3sm51534f


Author Yow, Huai Nyin
Biggs, Simon
Title Probing the stability of sterically stabilized polystyrene particles by centrifugal sedimentation
Journal name Soft Matter   Check publisher's open access policy
ISSN 1744-683X
1744-6848
Publication date 2013-11-14
Sub-type Article (original research)
DOI 10.1039/c3sm51534f
Open Access Status Not Open Access
Volume 9
Issue 42
Start page 10031
End page 10041
Total pages 11
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract The stability and sedimentation behaviour of sterically stabilized temperature-sensitive colloidal particles has been investigated as a function of temperature and electrolyte concentration via an analytical centrifugation technique, the LUMiSizer®. The technique builds a steady particle bed at low centrifugal acceleration (∼145 × g), that is subsequently assessed in terms of network strength as the centrifugal field is increased up to ∼2325 × g. Stable particle dispersions produce a smooth constant profile irrespective of applied force, whilst aggregated dispersions show a stepwise compression profile with increasing force. The extent of bed compression, which correlates to the degree of particle aggregation, is more prominent at high electrolyte concentrations and temperatures. This is due to the dehydration of the steric stabilising layer and/or electrical double layer screening effects, which induce greater instability in the particles. Equilibrium compressive yield stress, Py(øeq), has been used to characterise the bed compression responses. Py(øeq) shows a power-law dependency on the particle volume fraction, with a denser bed produced at lower electrolyte concentrations at a given centrifugal force. P y(øeq) analysis has also assisted in describing the differences in particle structure as a function of thermal stability of the colloidal particles (i.e. with 'sterically repulsive' solvated polymeric shell or 'attractive' collapsed polymeric shell).
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 4 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Fri, 13 Jun 2014, 19:58:41 EST by System User on behalf of Faculty Of Engineering, Architecture & Info Tech