Velocity and Equilibrium Aspects of the Sedimentation of Agar Gels

Paper presented at a symposium on “Photographic Gelatin” organized by the Science Committee of the Royal Photographic Society 1-4 September, 1970 in Cambridge.

Abstract

When a gel is subjected to a centrifugal field of sufficient magnitude, the motion of the gel surface which ensues may be followed readily and used to characterize gel behaviour. Eventually the motion slows down and ultimately ceases, the system showing no further change as long as the experimental conditions, particularly the speed, remain constant. The “equilibrium’ condition can even be approached from another direction. The present paper deals with the gel concentration distribution during centrifugation, comparing it with typical solution systems. It deals also with the final “equilibrium” distribution from which, for favourable systems, swelling pressure data may be derived.

Notes

Paper presented at a symposium on “Photographic Gelatin” organized by the Science Committee of the Royal Photographic Society 1-4 September, 1970 in Cambridge.