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Linear and nonlinear microrheology of dense colloidal suspensions

Wilson, L., Besseling, R., Arlt, J. and Poon, W. C. K. (2006) Linear and nonlinear microrheology of dense colloidal suspensions. In: Dholakia, K. and Spalding, G. C. (eds.) Proceedings of the Society of Photo-Optical Instrumentation Engineers, Optical Trapping and Optical Micromanipulation III. Proceedings of the Society of Photo-Optical Instrumentation Engineers (Spie), 6326. SPIE, San Diego.

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To link to this item DOI: 10.1117/12.681569

Abstract/Summary

The length and time scales accessible to optical tweezers make them an ideal tool for the examination of colloidal systems. Embedded high-refractive-index tracer particles in an index-matched hard sphere suspension provide 'handles' within the system to investigate the mechanical behaviour. Passive observations of the motion of a single probe particle give information about the linear response behaviour of the system, which can be linked to the macroscopic frequency-dependent viscous and elastic moduli of the suspension. Separate 'dragging' experiments allow observation of a sample's nonlinear response to an applied stress on a particle-by particle basis. Optical force measurements have given new data about the dynamics of phase transitions and particle interactions; an example in this study is the transition from liquid-like to solid-like behaviour, and the emergence of a yield stress and other effects attributable to nearest-neighbour caging effects. The forces needed to break such cages and the frequency of these cage breaking events are investigated in detail for systems close to the glass transition.

Item Type:Book or Report Section
Refereed:No
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences
ID Code:5576
Additional Information:Conference on Optical Trapping and Optical Micromanipulation III
Publisher:SPIE

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