Imperial College London
Alternate

prof paul f. luckham

Faculty of Engineering, Department of Chemical Engineering

Professor in Particle Technology
 
 
 
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Contact

 

+44 (0)20 7594 5583p.luckham01 Website

 
 
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Assistant

 

Miss Jessica Baldock +44 (0)20 7594 5699

 
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Location

 

104Roderic Hill BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Collini:2018:10.1016/j.jcis.2018.01.094,
author = {Collini, H and Mohr, M and Luckham, P and Shan, J and Russell, A},
doi = {10.1016/j.jcis.2018.01.094},
journal = {Journal of Colloid and Interface Science},
pages = {1--8},
title = {The effects of polymer concentration, shear rate and temperature on the gelation time of aqueous Silica-Poly(ethylene-oxide) "Shake-gels"},
url = {http://dx.doi.org/10.1016/j.jcis.2018.01.094},
volume = {517},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - HypothesisAqueous mixtures of silica and Poly(ethylene-oxide) (PEO) are known as “Shake-gels” due to the formation of reversible gels when subject to an applied force, such as shaking. This shear-thickening effect can be observed using a rheometer, via distinct and abrupt increases in the viscosity of the material. Preliminary experiments qualitatively showed that the time elapsed before this occurs, termed the gelation time, varied depending on the conditions used. This paper reports on a systematic study into the effects of polymer concentration, shear rate and temperature on the gelation time, to quantify any relationships that exist between the variables and develop understanding of the gelation mechanism and kinetics.ExperimentsDifferent constant shear rates were applied to samples at various polymer concentrations and temperatures using a rheometer with concentric cylinder geometry.FindingsThe gelation time varied significantly from several seconds to an hour or more and was exponentially accelerated by shear rate. A peak in gelation time occurred at medium polymer concentrations of 0.35–0.40% (25% silica) and at a temperature about 20°C. Higher temperatures also exponentially accelerated the gelation time as kinetic effects dominated the thermodynamic and structural resistances to gel formation.
AU  - Collini,H
AU  - Mohr,M
AU  - Luckham,P
AU  - Shan,J
AU  - Russell,A
DO  - 10.1016/j.jcis.2018.01.094
EP  - 8
PY  - 2018///
SN  - 0021-9797
SP  - 1
TI  - The effects of polymer concentration, shear rate and temperature on the gelation time of aqueous Silica-Poly(ethylene-oxide) "Shake-gels"
T2  - Journal of Colloid and Interface Science
UR  - http://dx.doi.org/10.1016/j.jcis.2018.01.094
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000429503500001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/65466
VL  - 517
ER  -
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