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Structural arrest and dynamic localization in biocolloidal gels

Mahmoudi, N. LU and Stradner, A. LU (2017) In Soft Matter 13(26). p.4629-4635
Abstract

Casein micelles interacting via an entropic intermediate-ranged depletion attraction exhibit a fluid-to-gel transition due to arrested spinodal decomposition. The bicontinuous networked structure of the gel freezes shortly after formation. We determine the timescales of structural arrest from the build-up of network rigidity after pre-shear rejuvenation, and find that the arrest time as well as the plateau elastic modulus of the gel diverge as a function of the volume fraction and interaction potential. Moreover, we show using scaling from naïve mode coupling theory that their mechanical properties are dictated by their microscopic dynamics rather than their heterogeneous large scale structure.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
13
issue
26
pages
7 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85022037021
ISSN
1744-683X
DOI
10.1039/c7sm00496f
language
English
LU publication?
yes
id
8accf52c-ec2f-4f9e-9e7f-54c3cd752b8f
date added to LUP
2017-07-25 07:00:26
date last changed
2017-07-26 03:00:08
@article{8accf52c-ec2f-4f9e-9e7f-54c3cd752b8f,
  abstract     = {<p>Casein micelles interacting via an entropic intermediate-ranged depletion attraction exhibit a fluid-to-gel transition due to arrested spinodal decomposition. The bicontinuous networked structure of the gel freezes shortly after formation. We determine the timescales of structural arrest from the build-up of network rigidity after pre-shear rejuvenation, and find that the arrest time as well as the plateau elastic modulus of the gel diverge as a function of the volume fraction and interaction potential. Moreover, we show using scaling from naïve mode coupling theory that their mechanical properties are dictated by their microscopic dynamics rather than their heterogeneous large scale structure.</p>},
  author       = {Mahmoudi, N. and Stradner, A.},
  issn         = {1744-683X},
  language     = {eng},
  number       = {26},
  pages        = {4629--4635},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Structural arrest and dynamic localization in biocolloidal gels},
  url          = {http://dx.doi.org/10.1039/c7sm00496f},
  volume       = {13},
  year         = {2017},
}