47 0

Origin of de-swelling and dynamics of dense ionic microgel suspensions

Title
Origin of de-swelling and dynamics of dense ionic microgel suspensions
Author
김진웅
Keywords
COLLOIDAL GLASS-TRANSITION; ANGLE NEUTRON-SCATTERING; STRUCTURAL RELAXATION; LIGHT-SCATTERING; HARD-SPHERES; PARTICLES; VISCOSITY; SYSTEMS; GEL; PH
Issue Date
2012-03
Publisher
AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Citation
The Journal of chemical physics Vol.136 No.12 [2012] 124905
Abstract
A direct consequence of the finite compressibility of a swollen microgel is that it can shrink and deform in response to an external perturbation. As a result, concentrated suspensions of these particles exhibit relaxation dynamics and rheological properties which can be very different with respect to those of a hard sphere suspension or an emulsion. We study the reduction in size of ionic microgels in response to increasing number of particles to show that particle shrinkage originates primarily from steric compression, and that the effect of ion-induced de-swelling of the polymer network is negligible. With increasing particle concentration, the single particle dynamics switch from those typical of a liquid to those of a super-cooled liquid and finally to those of a glass. However, the transitions occur at volume fractions much higher than those characterizing a hard sphere system. In the supercooled state, the distribution of displacements is non-Gaussian and the dependence of the structural relaxation time on volume fraction is describable by a Volger-Fulcher-Tammann function. (C) 2012 American Institute of Physics. [http://dx.doi.org.access.hanyang.ac.kr/10.1063/1.3697762]
URI
http://aip.scitation.org/doi/10.1063/1.3697762
ISSN
0021-9606
DOI
10.1063/1.3697762
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE