Structural Analysis of Cellulose-Coated Oil-in-Water Emulsions Fabricated from Molecular Solution

Napso, Sofia; Cohen, Yachin; Fu, Zhendong; Rein, Dmitry M.; Radulescu, Aurel

doi:10.1021/acs.langmuir.8b01325

Journal Article

FZJ-2018-05114

Structural Analysis of Cellulose-Coated Oil-in-Water Emulsions Fabricated from Molecular Solution

Napso, S. (Corresponding author) ; Rein, D. M. ; Fu, Z. ; Radulescu, A.FZJ* ; Cohen, Y.

2018
ACS Publ. Washington, DC

Langmuir 34(30), 8857 - 8865 (2018) [10.1021/acs.langmuir.8b01325]

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Please use a persistent id in citations: doi:10.1021/acs.langmuir.8b01325

Abstract: Natural cellulose has been used as a coating to stabilize oil-in-water (o/w) emulsions by exploiting the amphiphilic character of the cellulose chains molecularly dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate. Its cellulose coating exhibits a continuous amorphous structure which differs significantly from the cellulose particle stabilization used in Pickering emulsions. The structure of these cellulose-coated o/w emulsion particles, in particular the cellulose coating shell characteristics (thickness, porosity, and composition), is studied by using a combination of direct imaging methods such as cryogenic electron microscopy and fluorescence microscopy with small-angle neutron scattering measurements. This work suggests a unique multicompartment structure of the emulsion particles: an oil core, surrounded by an inner shell composed of a porous cellulose gel, encapsulated by a dense outer cellulose shell, a few nanometers in thickness. The thickness of the inner cellulose shell varies significantly. The nanoscale emulsion droplets exhibit a thickness of 10 ± 3 nm, whereas the larger micron-sized droplets exhibit a thicker inner cellulose shell of 500–750 nm. It is also inferred that the cellulose shells contain water rather than oil.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd)

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