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Findings in Nanocrystals Reported from National Research Council of Canada (Unique viscoelastic behaviors of colloidal nanocrystalline cellulose...

July 1, 2014



Findings in Nanocrystals Reported from National Research Council of Canada (Unique viscoelastic behaviors of colloidal nanocrystalline cellulose aqueous suspensions)

By a News Reporter-Staff News Editor at Life Science Weekly -- New research on Nanocrystals is the subject of a report. According to news originating from Edmonton, Canada, by NewsRx correspondents, research stated, "Unique rheological and phase behaviors of rod-like nanocrystalline cellulose (NCC) suspensions in aqueous media are revealed in the present article. Specifically, the NCC aqueous suspension remained isotropic in a wide NCC concentration range in which the suspension underwent transition from dilute solution to gel, and the relative viscosity of the NCC suspension could be well fitted by the Sato-Teramoto theory in the full concentration range tested."

Our news journalists obtained a quote from the research from the National Research Council of Canada, "Correspondingly, both zero-shear viscosity and complex viscosity increased monotonically with NCC concentration, and no maximum value was observed along the curves of zero-shear viscosity or complex viscosity versus NCC concentration, indicating a deviation from the lyotropic system. However, a shear-induced birefringence phenomenon was observed, indicating the NCC suspension formed a temporary ordered structure in the external force field but was unable to form an anisotropic (liquid crystalline) phase. The Cox-Merz rule was not applicable for the NCC suspension as a result of oriented domains, i.e., rod-like NCC particles. Moreover, time-concentration superposition was successfully applied to both the storage and loss modulus, attributed to the isotropic feature of the NCC suspension in the tested concentration range. The reason why this NCC suspension remained isotropic could be because of the strong electrostatic repulsions between NCC particles and the weak tendency or driving force of anisotropy formation as a result of the small aspect ratio of NCC particles, Na+ counterions and large amounts of negative charges along the NCC particles."

According to the news editors, the research concluded: "The results suggested that not all the rod-like particles were able to form an anisotropic phase in aqueous suspension, but dominated by various factors."

For more information on this research see: Unique viscoelastic behaviors of colloidal nanocrystalline cellulose aqueous suspensions. Cellulose, 2014;21(3):1239-1250. Cellulose can be contacted at: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer - www.springer.com; Cellulose - www.springerlink.com/content/0969-0239/)

The news correspondents report that additional information may be obtained from A. Lu, Natl Res Council Canada, Natl Inst Nanotechnol, Edmonton, AB T6G 2M9, Canada. Additional authors for this research include U. Hemraz, Z. Khalili and Y. Boluk (see also Nanocrystals).

Keywords for this news article include: Canada, Alberta, Edmonton, Nanotechnology, Nanocrystalline, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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