Salt responsive Pickering emulsions stabilized by functionalized cellulose nanofibrils

James Courtenay, Yun Jin, Julien Schmitt, Zakir Hossain, Najet Mahmoudi, Janet L Scott, Karen Edler

Research output: Contribution to journalArticlepeer-review

21 Citations (SciVal)

Abstract

Oil in water emulsions have been stabilized by functionalized cellulose nanofibrils, bearing either negative (oxidized cellulose nanofibrils, OCNF), or positive (cationic cellulose nanofibrils, CCNF) surface charge. The size of the droplets was measured by laser diffraction, while the structure of the shell of the Pickering emulsion droplets was probed using small angle neutron scattering (SANS), confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM) and rheology measurements. Both OCNF and CCNF-stabilized emulsions present a very thick shell (>100 nm), comprised of densely packed CNF. OCNF stabilized emulsions proved to be salt responsive, influencing the droplet aggregation and ultimately the gel properties of the emulsions; while CCNF emulsions, on the other hand, showed very little salt-dependent behavior.
Original languageEnglish
Pages (from-to)6864–6873
JournalLangmuir
Volume37
Issue number23
Early online date3 Jun 2021
DOIs
Publication statusPublished - 15 Jun 2021

Funding

The authors thank the EPSRC for funding this project (grant EP/N033310/1). We acknowledge ISIS for the provision of beamtime for the SANS experiments, and Dr. Ann Terry is thanked for her assistance with the first SANS experiment on Sans2d at the ISIS Neutron and Muon Source (experiment nos. RB1410091 and RB1710159). Dr. Ursula Potter is thanked for assistance in the acquisition of the TEM and SEM images and Anne Gesell for assistance in CLSM imaging. J.C.C. acknowledges funding from the EPSRC Centre for Doctoral Training in Sustainable Chemical Technology (EP/L016354/1).

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