Vol. 68, No. 2 (July 1999)
Rakesh Gupta, Editor
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Executive Committee - 1997-99
William B. Russel
The Bingham medal of the Society for 1999 will be awarded at the
Madison meeting to Professor Bill Russel of Princeton University. A
write-up appears inside this issue of the Bulletin.
|Prof. A. Jeffrey Giacomin
Rheology Research Center
University of Wisconsin
Madison, WI 53706-1572
(608) 262-7473; Fax: (608) 265-2316
The winners of the 1999 Journal of Rheology Publication Award are T.C.B. McLeish and R.G. Larson for "Molecular constitutive equations for a class of branched polymers: the pom-pom polymer," Journal of Rheology, 42, 81-110 (1998).
The hallmark of Professor William B. Russels contributions to rheology is integration, and the integration has occurred along several axes. One is an intellectual axis. He began his professorial career at Princeton with a thorough grounding in classical fluid mechanics, received from graduate study at Stanford and postdoctoral work at Cambridge. To this he added a comprehensive knowledge of the thermodynamics and statistical mechanics of colloids. This intellectual integration was facilitated through collaborative integration with colleagues, most notably chemical physicists such as Hall and colloid chemists such as Buscall. He also integrated his outlook on a fundamental/application axis through active interest in programs at Rohm and Haas, Exxon, and elsewhere. The unifying theme of this multidimensional integration is an understanding and control of macroscopic rheology through knowledge of interparticle forces and the related phase behavior over a range of shear rates or frequencies. Russel and his students have accomplished this by combining detailed measurements of model colloidal and polymeric systems with appropriate theory.
The style of Russels research as well as his capacity to be a role model have had much to do with the pre-eminent position he holds in the colloid science community. His dedication and intellectual integrity have inspired many of his students to prominence. His skill as an experimentalist as well as a theoretician is evident from many of his most important papers. His approachable personality has led to important collaborations with colleagues at Princeton as well as abroad. Finally, his influence as a guiding hand and interim director of the Princeton Materials Institute has had much to do with the focus of that organization on the physics of "soft" materials and their rheology.
Russel has made major contributions in at least four areas of suspension and polymer rheology: 1.) the rheology of charged dispersions, 2.) the effects of soluble polymer on phase behavior and rheology, 3.) the elasticity and consolidation of colloidal gels, and 4.) the connections between structure and rheology of concentrated dispersions. The research of Russel and coworkers includes the first quantitative connection between rheology and equilibrium phase transitions due to attractions in dispersions. In addition, Wagner and Russel were among the first to exploit scattering techniques for detecting non-equilibrium microstructure of concentrated dispersions under shear. Russels research on hydrophobically modified water soluble polymers has been similarly ground-breaking. In general, Russels research has paralleled the growth of modern colloid rheology. His influence has been so pervasive that no serious description of any of the four areas listed above would fail to refer to his work. Professor Russel is perhaps the most influential colloid scientist at work today.
A mistake has been printed in the contribution of P. Dontula and C.W. Macosko: Yield Stress in Orbitz, in the Rheology Bulletin 68(1), 5-6 (1999).
The buoyant (or gravitational) force is Dr g 4/3 pR3 (the gravitational acceleration g was omitted). The restoring force due to yield stress is p ty R2. A balance between the two gives an estimate of the maximum density difference between a particle of radius R and the liquid in order for the particle to remain stationary. With particles 5 mm in diameter, this density difference is 1.2 kg/m3 (not 12 kg/m3). Air bubbles smaller than 6 m m (not 60 m m) will remain stationary in Orbitz.
The authors thank Dr. Jin Kon Kim for bringing this error to their attention.
Dr. Skip Rochefort, Department of Chemical Engineering, Oregon State University, also brought to the attention of the authors his poster (along with high school student Jason Hower) presented at the 1998 Annual Meeting of the Society of Rheology in Monterey, CA. They measured the viscosity of four different bottles of Orbitz with a constant-stress rheometer. Viscosities of two samples fell sharply at a shear stress comparable to that measured by Dontula and Macosko (about 0.04 Pa), and the viscosities of the other two samples fell sharply at about twice that value.
An ad hoc committee has been drafting proposed changes to the Constitution and Rules of The Society of Rheology. The most important of changes PROPOSED by the ad hoc committee are:
In order for these proposed changes to become part of the Constitution of the Society of Rheology, they, as well as others contained in the draft revised constitution, must be voted on in a letter ballot of the membership of the Society of Rheology. As currently proposed, major issues (including those above) will be separated out into approximately 8 different issues to be voted on. All members of the Society of Rheology are asked to look over the proposed constitutional changes (see enclosed flyer or on the Web at http://www.umche.maine.edu/sorconst/) and give feedback to the Ad Hoc Committee on Constitutional Reform. A full discussion of the proposed changes will take place at the Society Business Meeting in Madison in October.
The Ad Hoc Committee on Constitutional Reform has been drafting changes to the Constitution and Rules of The Society of Rheology for the last three years. This committee, composed of Faith Morrison (chair), Arthur Metzner and Jeffrey Giacomin, solicited input from the SOR membership, deliberated, and reported to the Executive Committee in March on proposed changes to the SOR governing documents. The proposed changes fall into five categories (see enclosed draft of the proposed, revised Constitution):
The processes for amending the Constitution and Rules are slightly different, but both processes require that the membership, at a regularly scheduled annual meeting, first vote to conduct a letter ballot on the proposed amendments. The Executive Committee has proposed that such a vote take place at the Madison Meeting in October 1999.
The final ballot to be discussed in Madison will be developed by the Secretary and the Ad Hoc Committee on Constitutional Reform after the membership has had an opportunity to review the proposed revisions to the Constitution and Rules. The ballot will be a multi-part ballot so that members will have the opportunity to vote on approximately 8 different issues. The proposed constitutional revisions are posted on the World-Wide Web at http://www.umche.maine.edu/sorconst/, which is accessible from the SOR homepage. This page includes a draft ballot and a color-coded summary of the various changes by category.
Please contact the Ad Hoc Committee on Constitutional Reform with any suggestions or comments on the proposed changes to the Constitution and Rules. The purpose of this reform effort is to make the Constitution and Rules of The Society more accurately reflect the wishes of the membership. In order for this exercise to be meaningful, we need the widest possible participation of the membership. Please contact the committee by e-mailing Faith Morrison (firstname.lastname@example.org) or by writing to her at the following address:
|Faith Morrison, Associate Professor
Department of Chemical Engineering
Michigan Technological University
1400 Townsend Drive
Houghton, MI 49931-1295
Fax: (906) 487-3213
THE FULL SET OF PROPOSED CONSTITUTIONAL
CHANGES IS ON THE WEB AT
The Rheology Bulletin publishes papers on the applied aspects of Rheology which are intended for the non-specialist. Appropriate topics include the application of rheological principles to a specific system, instrumentation for rheological measurements, description of interesting rheological phenomena, and the use of well-established rheological techniques to characterize products, processes or phenomena. Papers describing historical aspects of the practice of rheology and how these have influenced current trends are welcome. Also welcome are papers that address the present and changing status of rheological education. Consultation with the Editor prior to manuscript submission is encouraged.
|THE SOCIETY OF RHEOLOGY
c/o American Institute of Physics
2 Huntington Quadrangle
Melville, NY 11747-4502
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