TY - JOUR
T1 - When Microrheology, Bulk Rheology, and Microfluidics Meet
T2 - Broadband Rheology of Hydroxyethyl Cellulose Water Solutions
AU - Del Giudice, Francesco
AU - Tassieri, Manlio
AU - Oelschlaeger, Claude
AU - Shen, Amy Q.
N1 - Funding Information:
The authors thank Francesco Greco, Pier Luca Maffettone, and Todd Squires for helpful conversation. The authors thank Dr. Steven Aird for careful proof reading. F.D.G. and A.Q.S. gratefully acknowledge the support of the Okinawa Institute of Science and Technology Graduate University with subsidy funding from the Cabinet Office, Government of Japan. M.T. acknowledges support via personal research fellowships from the Royal Academy of Engineering/EPSRC (10216/101).
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/4/11
Y1 - 2017/4/11
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.macromol.6b02727
DO - 10.1021/acs.macromol.6b02727
M3 - Article
AN - SCOPUS:85018497267
SN - 0024-9297
VL - 50
SP - 2951
EP - 2963
JO - Macromolecules
JF - Macromolecules
IS - 7
ER -