When microrheology, bulk rheology, and microfluidics meet: broadband rheology of hydroxyethyl cellulose water solutions

Del Giudice, F., Tassieri, M. , Oelschlaeger, C. and Shen, A. Q. (2017) When microrheology, bulk rheology, and microfluidics meet: broadband rheology of hydroxyethyl cellulose water solutions. Macromolecules, 50(7), pp. 2951-2963. (doi:10.1021/acs.macromol.6b02727)

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In this work, we present new insights related to a debate on the morphological structure of hydroxyethyl cellulose (HEC) molecules when dissolved in water, i.e., whether HEC adopts a linear-flexible or a rod-like fibrillar configuration. We have employed “seven” rheological techniques to explore the viscoelastic properties of HEC solutions at different time and length scales. This work demonstrates an excellent convergence between various rheological techniques over a broad range of frequencies and concentrations, allowing us to derive microstructural information for aqueous HEC solutions without the use of complex optical imaging techniques. We find that when dissolved in water unmodified HEC behaves like a linear uncharged polymer, with an entangled mass concentration of ce = 0.3 wt%. Moreover, for the first time we provide the concentration scaling laws (across ce) for the longest relaxation time λ of HEC solutions, obtained from direct readings and not inferred from fitting procedures of fluids shear flow curves.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Tassieri, Dr Manlio
Authors: Del Giudice, F., Tassieri, M., Oelschlaeger, C., and Shen, A. Q.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Macromolecules
Publisher:American Chemical Society
ISSN (Online):1520-5835
Published Online:22 March 2017
Copyright Holders:Copyright © 2017 American Chemical Society
First Published:First published in Macromolecules 50(7): 2951-2963
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
534472Rheology at the Microscale: New Tools for Bio-analysisManlio TassieriEngineering & Physical Sciences Research Council (EPSRC)10216/101ENG - BIOMEDICAL ENGINEERING

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