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Erratum: “Photoelectron trapping in N2O 7sigma-->ksigma resonant ionization” [J. Chem. Phys. 123, 014307 (2005)]

Rheology and phase behavior of dense casein micelle dispersions

J. Chem. Phys. 131, 165106 (2009); doi:10.1063/1.3245956

Published 29 October 2009

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A. Bouchoux,1,2 B. Debbou,1,2 G. Gésan-Guiziou,1,2 M.-H. Famelart,1,2 J.-L. Doublier,3 and B. Cabane4
1INRA, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
2AGROCAMPUS OUEST, UMR1253 Science et Technologie du Lait et de l'Oeuf, F-35042 Rennes, France
3INRA, UR1268 Biopolymères Interactions Assemblages, F-44316 Nantes, France
4PMMH, CNRS UMR7636, ESPCI, F-75231 Paris cedex 05, France
Casein micelle dispersions have been concentrated through osmotic stress and examined through rheological experiments. In conditions where the casein micelles are separated from each other, i.e., below random-close packing, the dispersions have exactly the flow and dynamic properties of the polydisperse hard-sphere fluid, demonstrating that the micelles interact only through excluded volume effects in this regime. These interactions cause the viscosity and the elastic modulus to increase by three orders of magnitude approaching the concentration of random-close packing estimated at Cmax[approximate]178  g/l. Above Cmax, the dispersions progressively turn into “gels” (i.e., soft solids) as C increases, with elastic moduli G[prime] that are nearly frequency independent. In this second regime, the micelles deform and/or deswell as C increases, and the resistance to deformation results from the formation of bonds between micelles combined with the intrinsic mechanical resistance of the micelles. The variation in G[prime] with C is then very similar to that observed with concentrated emulsions where the resistance to deformation originates from a set of membranes that separate the droplets. As in the case of emulsions, the G[prime] values at high frequency are also nearly identical to the osmotic pressures required to compress the casein dispersions. The rheology of sodium caseinate dispersions in which the caseins are not structured into micelles is also reported. Such dispersions have the behavior of associative polymer solutions at all the concentrations investigated, further confirming the importance of structure in determining the rheological properties of casein micelle systems. ©2009 American Institute of Physics
History: Received 15 July 2009; accepted 21 September 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/165106/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 62.20.de
    Elastic moduli of solids
  • 82.39.Wj
    Ion exchange, dialysis, osmosis, electro-osmosis, membrane processes in biological systems
  • 64.70.D-
    Solid-liquid transitions
  • 62.20.F-
    Deformation and plasticity of solids
  • 81.40.Lm
    Deformation, plasticity, and creep
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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