Extensional Flow Behavior of Methylcellulose Solutions Containing Fibrils

Svetlana Morozova, Peter W. Schmidt, Athena Metaxas, Frank S. Bates, Timothy P. Lodge, Cari S. Dutcher

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The extensional properties of semidilute aqueous methylcellulose (MC) solutions have been characterized. Pure aqueous MC solutions are shear-thinning liquids at room temperature. With the addition of 8 wt % NaCl, a fraction of MC self-assembles into long fibrils, which modify the rheological properties of the original MC solution. Capillary Breakup Extensional Rheometry (CaBER) was used to characterize salt-free and 8 wt % NaCl solutions of MC at room temperature. The salt-free solutions exhibit only power-law behavior whereas solutions with NaCl exhibit both power-law and elastic regimes. As MC concentration increases, the extensional relaxation time also increases strongly, from 0.04 s at 0.5 wt % to 4 s at 1 wt %. In addition, the apparent extensional viscosity rapidly increases as a function of increasing MC concentration, from 40 Pa·s at 0.5 wt % to 1300 Pa·s at 1 wt %. This behavior is attributed to the presence of fibrils in the MC solutions containing NaCl.

Original languageEnglish (US)
Pages (from-to)347-352
Number of pages6
JournalACS Macro Letters
Volume7
Issue number3
DOIs
StatePublished - 2018

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Methylcellulose
Salts
Drop breakup
Shear thinning
Relaxation time
Viscosity
Temperature
Liquids

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 4

Cite this

Extensional Flow Behavior of Methylcellulose Solutions Containing Fibrils. / Morozova, Svetlana; Schmidt, Peter W.; Metaxas, Athena; Bates, Frank S.; Lodge, Timothy P.; Dutcher, Cari S.

In: ACS Macro Letters, Vol. 7, No. 3, 2018, p. 347-352.

Research output: Contribution to journalArticle

Morozova, Svetlana ; Schmidt, Peter W. ; Metaxas, Athena ; Bates, Frank S. ; Lodge, Timothy P. ; Dutcher, Cari S. / Extensional Flow Behavior of Methylcellulose Solutions Containing Fibrils. In: ACS Macro Letters. 2018 ; Vol. 7, No. 3. pp. 347-352.
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abstract = "The extensional properties of semidilute aqueous methylcellulose (MC) solutions have been characterized. Pure aqueous MC solutions are shear-thinning liquids at room temperature. With the addition of 8 wt {\%} NaCl, a fraction of MC self-assembles into long fibrils, which modify the rheological properties of the original MC solution. Capillary Breakup Extensional Rheometry (CaBER) was used to characterize salt-free and 8 wt {\%} NaCl solutions of MC at room temperature. The salt-free solutions exhibit only power-law behavior whereas solutions with NaCl exhibit both power-law and elastic regimes. As MC concentration increases, the extensional relaxation time also increases strongly, from 0.04 s at 0.5 wt {\%} to 4 s at 1 wt {\%}. In addition, the apparent extensional viscosity rapidly increases as a function of increasing MC concentration, from 40 Pa·s at 0.5 wt {\%} to 1300 Pa·s at 1 wt {\%}. This behavior is attributed to the presence of fibrils in the MC solutions containing NaCl.",
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AU - Morozova, Svetlana

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AU - Lodge, Timothy P.

AU - Dutcher, Cari S.

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N2 - The extensional properties of semidilute aqueous methylcellulose (MC) solutions have been characterized. Pure aqueous MC solutions are shear-thinning liquids at room temperature. With the addition of 8 wt % NaCl, a fraction of MC self-assembles into long fibrils, which modify the rheological properties of the original MC solution. Capillary Breakup Extensional Rheometry (CaBER) was used to characterize salt-free and 8 wt % NaCl solutions of MC at room temperature. The salt-free solutions exhibit only power-law behavior whereas solutions with NaCl exhibit both power-law and elastic regimes. As MC concentration increases, the extensional relaxation time also increases strongly, from 0.04 s at 0.5 wt % to 4 s at 1 wt %. In addition, the apparent extensional viscosity rapidly increases as a function of increasing MC concentration, from 40 Pa·s at 0.5 wt % to 1300 Pa·s at 1 wt %. This behavior is attributed to the presence of fibrils in the MC solutions containing NaCl.

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