Edge-on (cellulose II) and face-on (cellulose I) adsorption of cellulose nanocrystals at the oil/water interface; a combined entropic and enthalpic process - Archive ouverte HAL Access content directly
Journal Articles Biomacromolecules Year : 2022

Edge-on (cellulose II) and face-on (cellulose I) adsorption of cellulose nanocrystals at the oil/water interface; a combined entropic and enthalpic process

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Abstract

Nanocelluloses can be used to stabilize oil/water surfaces, forming so-called Pickering emulsions. In this work, we compare the organization of native and mercerized cellulose nanocrystals (CNC-I and CNC-II) adsorbed on the surface of hexadecane droplets dispersed in water at different CNC 2 concentrations. Both types of CNC have an elongated particle morphology and form a layer strongly adsorbed at the interface. However, while the layer thickness formed with CNC-I is independent of the concentration at 7 nm, CNC-II forms a layer ranging from 9 to 14 nm thick with increasing concentration, as determined using small angle neutron scattering with contrast matched experiments. Molecular dynamics (MD) simulations showed a preferred interacting crystallographic plane for both crystalline allomorphs that exposes the CH groups (1 0 0 and 0 1 0) and is therefore considered hydrophobic. Furthermore, this study suggests that whatever the allomorph, the migration of CNCs to the oil-water interface is spontaneous and irreversible, and is driven by both enthalpic and entropic processes.
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Dates and versions

hal-03774110 , version 1 (09-09-2022)

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Cite

Somia Haouache, Yu Chen, Clara Jimenez-Saelices, Fabrice Cousin, Pan Chen, et al.. Edge-on (cellulose II) and face-on (cellulose I) adsorption of cellulose nanocrystals at the oil/water interface; a combined entropic and enthalpic process. Biomacromolecules, 2022, 23 (9), pp.3517-3524. ⟨10.1021/acs.biomac.2c00201⟩. ⟨hal-03774110⟩
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