Origin of suppressed demixing in casein/xanthan mixtures
van Gruijthuijsen, Kitty ; Herle, Vishweshwara ; Tuinier, Remco ; Schurtenberger, Peter LU
and Stradner, Anna
LU
(2012)
In Soft Matter
8(5).
p.1547-1555
- Abstract
- We explore the properties of casein/xanthan mixtures for xanthan concentrations beyond those inducing phase separation. Previous work has successfully described the onset of demixing by depletion theory in the protein limit, where the xanthan polysaccharides, the polymers, are larger than the caseins from skim milk powder, the colloids (S. Bhat et al., J. Phys.: Condens. Matter, 2006, L339). We now extend these studies to xanthan concentrations in a range of c/c* = 13-88, aiming to arrest the phase separation via a (transiently) arrested casein-rich phase. Surprisingly, we find that the casein-rich phase remains fluidic deep into the two-phase region, with an equilibrium composition that significantly differs from predictions for mixtures... (More)
- We explore the properties of casein/xanthan mixtures for xanthan concentrations beyond those inducing phase separation. Previous work has successfully described the onset of demixing by depletion theory in the protein limit, where the xanthan polysaccharides, the polymers, are larger than the caseins from skim milk powder, the colloids (S. Bhat et al., J. Phys.: Condens. Matter, 2006, L339). We now extend these studies to xanthan concentrations in a range of c/c* = 13-88, aiming to arrest the phase separation via a (transiently) arrested casein-rich phase. Surprisingly, we find that the casein-rich phase remains fluidic deep into the two-phase region, with an equilibrium composition that significantly differs from predictions for mixtures of hard spheres plus flexible polymer chains in a good solvent. Furthermore, we show that macroscopic phase separation is arrested for c/c* > 60. Our investigations reveal that the rheological properties of the mixtures are fully determined by the xanthan-rich phase with characteristic long relaxation times that depend remarkably strongly on the xanthan concentration. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2362435
- author
- van Gruijthuijsen, Kitty
; Herle, Vishweshwara
; Tuinier, Remco
; Schurtenberger, Peter
LU
and Stradner, Anna
LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soft Matter
- volume
- 8
- issue
- 5
- pages
- 1547 - 1555
- publisher
- Royal Society of Chemistry
- external identifiers
-
- wos:000298990600035
- scopus:84855641703
- ISSN
- 1744-6848
- DOI
- 10.1039/c1sm06761c
- language
- English
- LU publication?
- yes
- id
- 4861fc4f-869f-4683-9694-6ca06767d51e (old id 2362435)
- date added to LUP
- 2016-04-01 15:01:20
- date last changed
- 2022-01-28 03:37:44
@article{4861fc4f-869f-4683-9694-6ca06767d51e,
abstract = {{We explore the properties of casein/xanthan mixtures for xanthan concentrations beyond those inducing phase separation. Previous work has successfully described the onset of demixing by depletion theory in the protein limit, where the xanthan polysaccharides, the polymers, are larger than the caseins from skim milk powder, the colloids (S. Bhat et al., J. Phys.: Condens. Matter, 2006, L339). We now extend these studies to xanthan concentrations in a range of c/c* = 13-88, aiming to arrest the phase separation via a (transiently) arrested casein-rich phase. Surprisingly, we find that the casein-rich phase remains fluidic deep into the two-phase region, with an equilibrium composition that significantly differs from predictions for mixtures of hard spheres plus flexible polymer chains in a good solvent. Furthermore, we show that macroscopic phase separation is arrested for c/c* > 60. Our investigations reveal that the rheological properties of the mixtures are fully determined by the xanthan-rich phase with characteristic long relaxation times that depend remarkably strongly on the xanthan concentration.}},
author = {{van Gruijthuijsen, Kitty and Herle, Vishweshwara and Tuinier, Remco and Schurtenberger, Peter and Stradner, Anna}},
issn = {{1744-6848}},
language = {{eng}},
number = {{5}},
pages = {{1547--1555}},
publisher = {{Royal Society of Chemistry}},
series = {{Soft Matter}},
title = {{Origin of suppressed demixing in casein/xanthan mixtures}},
url = {{http://dx.doi.org/10.1039/c1sm06761c}},
doi = {{10.1039/c1sm06761c}},
volume = {{8}},
year = {{2012}},
}