Volume 76, Number 1, October 2006
|Page(s)||74 - 80|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||30 August 2006|
Linear viscoelastic properties of aging suspensions
Physics of Complex Fluids, Department of Science and Technology, University of Twente P.O. Box 217, 7500 AE Enschede, The Netherlands
Corresponding author: h.t.m.vandenEnde@utwente.nl
Accepted: 8 August 2006
We have examined the linear viscoelastic behavior of poly-N-isopropylacrylamide (PNIPAM) microgel suspensions in order to obtain insight in the aging processes in these densely packed suspensions at various temperatures below the volume transition temperature. The system is found to display a strong aging behavior. The viscoelastic moduli are compared to the predictions of the soft glassy rheology model. The model predicts quantitatively the loss modulus , the elastic modulus and their ratio . A relative noise temperature of is obtained. Despite the fact that the microgel particles are more compressed and hence less mobile at a lower thermodynamic temperature T, is found to be essentially independent of T within the range of C to C below the volume transition temperature.
PACS: 61.43.Fs – Glasses / 83.60.Bc – Linear viscoelasticity / 83.60.-a – Material behavior
© EDP Sciences, 2006
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.