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Beck-Candanedo S, Viet D, Gray DG. Induced phase separation in low-ionic-strength cellulose nanocrystal suspensions containing high-molecular-weight blue dextrans. Langmuir. 2006;22(21):8690-5doi: 10.1021/la061310j.
Beck-Candanedo, S., Viet, D., & Gray, D. G. (2006). Induced phase separation in low-ionic-strength cellulose nanocrystal suspensions containing high-molecular-weight blue dextrans. Langmuir : the ACS journal of surfaces and colloids, 22(21), 8690-5. https://doi.org/10.1021/la061310j
Beck-Candanedo, Stephanie, et al. "Induced phase separation in low-ionic-strength cellulose nanocrystal suspensions containing high-molecular-weight blue dextrans." Langmuir : the ACS journal of surfaces and colloids vol. 22,21 (2006): 8690-5. doi: https://doi.org/10.1021/la061310j
Beck-Candanedo S, Viet D, Gray DG. Induced phase separation in low-ionic-strength cellulose nanocrystal suspensions containing high-molecular-weight blue dextrans. Langmuir. 2006 Oct 10;22(21):8690-5. doi: 10.1021/la061310j. PMID: 17014106.
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Langmuir. 2006 Oct 10;22(21):8690-5. doi: 10.1021/la061310j.

Induced phase separation in low-ionic-strength cellulose nanocrystal suspensions containing high-molecular-weight blue dextrans.

Langmuir : the ACS journal of surfaces and colloids

Stephanie Beck-Candanedo, David Viet, Derek G Gray

Affiliations

  1. Department of Chemistry, Pulp and Paper Research Centre, McGill University, Montréal, Québec H3A 2A7, Canada.

PMID: 17014106 DOI: 10.1021/la061310j

Abstract

Spontaneous entropic phase separation phenomena occur in a wide range of systems containing highly anisotropic colloidal particles. Among these are aqueous suspensions of negatively charged cellulose I nanocrystals produced by sulfuric acid hydrolysis of native cellulose, which phase separate into isotropic and chiral nematic liquid-crystalline phases. Phase separation of an isotropic phase from a completely ordered nanocrystal suspension may be induced by the addition of salts or nonadsorbing macromolecules. In previous work (Edgar, C. D.; Gray, D. G. Macromolecules 2002, 35, 7400-7406), an isotropic phase was found to form over a period of several days when blue dextran (a sulfonated triazine dye, Cibacron blue 3G-A, covalently attached to high-molecular-weight dextran chains) was added to initially ordered suspensions. Here we report work showing that the observed phase separation was associated with the charged dye molecules attached to the dextran. The Cibacron blue 3G-A dye attached to blue dextran was found to induce greater phase separation than free (unbound) dye; at increasing ionic strength, depletion attractions due to the blue dextran increasingly contribute to the phase separation.

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