Impact of wormlike micelles on nano and macroscopic structure of TEMPO-oxidized cellulose nanofibril hydrogels

Marcelo da Silva, Vincenzo Calabrese, Julien Schmitt, Zakir Hossain, Saffron Bryant, Najet Mahmoudi, Janet L. Scott, Karen Edler

Research output: Contribution to journalArticle

Abstract

In this work, we investigated the effect of adding surfactant mixtures on the rheological properties of TEMPO-oxidized cellulose nanofibril (OCNF) saline dispersions. Three surfactant mixtures were studied: cocamidopropyl betaine (CAPB)/sodium dodecyl sulfate (SDS), which forms wormlike micelles (WLMs); cocamidopropylamine oxide (CAPOx)/SDS, which forms long rods; and CAPB/sodium lauroyl sarcosinate (SLS), which forms spherical micelles. The presence of micelles in these surfactant mixtures, independent of their morphology, leads to an increase of tan δ, making the gels less solid-like, therefore acting as a plasticizer. WLMs were able to suppress strain stiffening normally observed in OCNF gels at large strains. OCNF/WLM gels have lowerG′ values than OCNF gels while the other micellar morphologies have a reduced impact onG′. The presence of unconnected micelles leads to increased dissipative deformation in OCNF gels without affecting the connectivity of the fibrils, while the presence of entangled micelles interferes with the OCNF network.

Original languageEnglish
Pages (from-to)4887-4896
Number of pages10
JournalSoft Matter
Volume16
Issue number20
Early online date30 Apr 2020
DOIs
Publication statusPublished - 28 May 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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Dataset for "Impact of wormlike micelles on nano and macroscopic structure of TEMPO-oxidized cellulose nanofibrils hydrogels"

Alves Da Silva, M. (Creator), Calabrese, V. (Creator), Schmitt, J. (Creator), Hossain, Z. (Creator), Bryant, S. (Creator), Mahmoudi, N. (Creator), Scott, J. L. (Creator) & Edler, K. (Creator), University of Bath, 30 Apr 2020

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