Date and Location

Saturday and Sunday
February 10 & 11, 2001

The course will begin at 8:30 AM, Saturday, February 10, 2001.

This short course is held in conjunction with the
72nd Annual Meeting of The Society of Rheology
February 11-15, 2001

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Instructors

William B. Russel is a Professor in the Department of Chemical Engineering and the Princeton Materials Institute. He is well known for his research on the phase behavior and rheology of colloidal dispersions and is co-author of Colloidal Dispersions published by Cambridge University Press. He is a member of the National Academy of Engineering and the American Academy of Arts and Sciences and received the Walker Award from the AIChE in 1992 and the Bingham Medal from The Society of Rheology in 1999.

Norman J. Wagner, a Professor of Chemical Engineering at the University of Delaware, has interests spanning colloid and polymer science. Within an extensive rheological and rheo-optical laboratory he addresses dispersions, liquid crystalline polymers, and dendrimers and hyperbranched polymers, producing rheological, optical, and neutron scattering methods for characterization, as well as fundamental understanding of phenomena such as dilatancy. He has received the NSF Presidential Young Investigator Award and the Fulbright Senior Scholar Award.

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Course Description

This course will give an overview of dispersion rheology and how that rheology arises from colloidal level forces. It is appropriate for the practitioner seeking to control products and processes, as well as researchers interested in structure-property relationships in complex fluids. Only a basic knowledge of physical chemistry is a prerequisite.

The highly nonlinear and time-dependent rheology of colloidal dispersions derives from the coupling among interparticle and Brownian forces, hydrodynamic forces due to an imposed flow, and the non-equilibrium microstructure. Successful formulation and processing requires control of the rheology through the physical chemistry; conversely, the rheological response can be used to characterize colloids in situ. This course will be motivated by this coupling between microscopic and macroscopic behavior, seeking to convey the qualitative understanding needed to address current technological and scientific problems in dispersion rheology.

The introduction will review the relevant interparticle and hydrodynamic forces and the resulting stability, phase behavior, and dynamics. Then we will examine in detail the microscopic origin of stresses and the effect of shear on the microstructure Then from dimensional analysis and simple models one can anticipate the sensitivity or insensitivity of different aspects of the rheology to colloidal forces and the development of structure-property relationships for dispersion rheology. This will also lead into a presentation of appropriate rheological measurements and rheo-optical and scattering techniques for detecting the non-equilibrium microstructure.

These underlying principles will be illustrated through the rheology of model dispersions:

	hard spheres and rods,
	charged and polymerically stabilized spheres,
	adhesive hard spheres,
	dispersions subject to depletion attractions, and
	dispersions containing associative polymer.

These relate the equilibrium phase behavior and the rheology qualitatively and, with existing theory, yield quantitative scalings for the dependence of the low shear viscosity; critical, yield, and Bingham stresses; and high frequency modulus on the particle volume fraction and the strength and range of the interparticle forces. Simple empirical models will be introduced where appropriate.

Special attention will also be devoted to

	shear thickening and dilatancy of concentrated dispersions,
	more complex dispersions such as clays or swollen microgels,
	computer simulations capable of predicting rheological response,
	optical techniques including rheo-optics, and
	means of characterizing the interparticle forces via rheological measurements.

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Registration Information

The fee for the two-day course is $450 prior to January 15, 2001. For registration after January 15, the fee will be $550. Student rates are $225 prior to January 15 and $275 after January 15.

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Registration Form and Lodging Accommodations

Short Course Registration Form

Lodging Accommodations

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