Volume 66, Number 1, April 2004
|Page(s)||125 - 131|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 March 2004|
Sedimentation and multi-phase equilibria in mixtures of platelets and ideal polymer
Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute Utrecht University - Padualaan 8, 3584 CH Utrecht, The Netherlands
Corresponding author: email@example.com
Accepted: 26 January 2004
The role of gravity in the phase behaviour of mixtures of hard colloidal plates without and with non-adsorbing ideal polymer is explored theoretically. By analyzing the (macroscopic) osmotic equilibrium conditions, we show that sedimentation of the colloidal platelets is significant on a height range of even a centimeter. Gravity enables the system to explore a large density range within the height of a test tube which may give rise to the simultaneous presence of multiple phases. As to plate-polymer mixtures, it is shown that sedimentation may lead to a four-phase equilibrium involving an isotropic gas and liquid phase, nematic and columnar phase. The phenomenon has been observed experimentally in systems of colloidal gibbsite platelets mixed with PDMS polymer.
PACS: 82.70.Dd – Colloids / 64.70.Md – Transitions in liquid crystals
© EDP Sciences, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.