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j. Soc. Cosmet. Chem., 36, 101-104 (January/February 1985) Abstracts The Annual Scientific Meetings and Seminars of the Society of Cosmetic Chemists are important venues for informing the participants about the state of the art and recent technical advances in the field of Cosmetic Science. To provide broader dissemination of that information, the Publication Committee has decided to publish abstracts of the technical presentations made at these Meetings and Seminars in the Journal.--The Editor. Society of Cosmetic Chemists ANNUAL SEMINAR May 9-10, 1985 St. Louis, Missouri Program arranged by the Society's Committee on Scientific Affairs Jan Curry, Chairman, 1985 Stephen M. Greenberg, Ph.D., Chairman, 1984 SCIENTIFIC SESSION I SUSPENSION TECHNOLOGY Effect of particle interactions on the physical properties of suspensions Stanley L. Hem, Ph.D., and Joe L. White, Ph.D., Purdue University, School of Pharmacy and Agronomy, W. Lafayette, IN 47907 Physical properties of suspensions such as viscosity, settling, sedimentation, and water-retaining prop- erties are largely controlled by particle interactions. The use of fiber optic Doppler anemometry for the direct measurement of particle interactions is dem- onstrated by studying the effect of ionic strength and valence of the counter-ion on the floccutation of monodisperse latex suspensions having a fixed negative surface charge. The area under the curve of the modified Lorentzian power spectrum obtained by fiber optic Doppler anemometry is shown to be directly related to the colloidal fraction of particles that exhibit Brownian motion. The effects of par- ticle size, volume fraction, surface charge, and shear on particle interactions in suspensions as determined by fiber optic Doppler anemometry are correlated with physical test results. Physical stability of suspensions Joel L. Zatz, Ph.D., Rutgers College of Pharmacy, P.O. Box 789, Piscataway, NJ 08854 Thorough wetting and particle dispersion are im- portant first steps in the formation of uniform sus- pension systems. The critical surface tension of the solid provides guidance in the selection of surfac- rants used to promote wetting. Wetting character- istics are related to deposition of particles onto the container walls during storage. Size and density of particles and rheology of the medium play impor- tant roles in determining sedimentation rate. Vis- cosity can be adjusted within wide limits so as to modify the settling rate. However, the type of flow behavior is of utmost importance. Materials chosen as suspending agents must provide resistance to sed- imentation, while still permitting high shear op- erations such as shaking and pouring. Particle floc- culation affects sedimentation rate as well as the degree of compaction that takes place within the sediment. In general, coarse deflocculated systems settle as individual particles to form a "caked" sed- iment, one which is extremely difficult or impos- sible to resuspend. Flocculation can be induced by several mechanisms. Compounds that can function as flocculants include electrolytes, polyols, surfac- tants, and polymers. A practical approach in formulating suspension antiperspirants Jitendra Patel, Ph.D., Walter V. Fackler, Ph.D., and John R. Roheim, Ph.D., Armour-Dial, Inc., 15101 N. Scottsdale Road, Scottsdale, AZ 85260 In the past, antiperspirant products' successes were 101