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Adsorption and interfacial structure of nanocelluloses at fluid interfaces.

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Title:	Adsorption and interfacial structure of nanocelluloses at fluid interfaces.
Authors:	Bertsch, Pascal¹ (AUTHOR) pascal.bertsch@hest.ethz.ch, Fischer, Peter¹ (AUTHOR)
Source:	Advances in Colloid & Interface Science. Feb2020, Vol. 276, pN.PAG-N.PAG. 1p.
Subjects:	Adsorption (Chemistry), Contact angle, Surface properties, Adsorption kinetics, Foam, Emulsions, Oil-water interfaces, Cellulose nanocrystals
Abstract:	Nanocelluloses (NCs), more specifically cellulose nanocrystals and nanofibrils, are a green alternative for the stabilization of fluid interfaces. The adsorption of NCs at oil-water interfaces facilitates the formation of stable and biocompatible Pickering emulsions. In contrast, unmodified NCs are not able to stabilize foams. As a consequence, NCs are often hydrophobized by covalent modifications or adsorption of surfactants, allowing also the stabilization of foams or functional inverse, double, and stimuli-responsive emulsions. Although the interfacial stabilization by NCs is readily exploited, the driving force of adsorption and stabilization mechanisms remained long unclear. Here, we summarize the recent advances in the understanding of NC adsorption regarding kinetics, isotherms, and energetic aspects, as well as their interfacial structure, surface coverage, and contact angle. We thereby distinguish unmodified NCs, covalently modified NCs, and surfactant enhanced adsorption. Unlabelled Image • Review on the adsorption of nanocelluloses at fluid-fluid interfaces regarding kinetics, isotherms, and energetic aspects • Discussion on the interfacial layer structure, coverage, rheology, and contact angle of nanocelluloses at fluid interfaces • Native hydrophilic and hydrophobized nanocelluloses reveal fundamentally different adsorption and interfacial structure • Discussion why nanocelluloses efficiently stabilize emulsions but fail to stabilize foams • Altering nanocellulose surface properties allows the stabilization of foams and inverse, double, or responsive emulsions [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Nanocelluloses (NCs), more specifically cellulose nanocrystals and nanofibrils, are a green alternative for the stabilization of fluid interfaces. The adsorption of NCs at oil-water interfaces facilitates the formation of stable and biocompatible Pickering emulsions. In contrast, unmodified NCs are not able to stabilize foams. As a consequence, NCs are often hydrophobized by covalent modifications or adsorption of surfactants, allowing also the stabilization of foams or functional inverse, double, and stimuli-responsive emulsions. Although the interfacial stabilization by NCs is readily exploited, the driving force of adsorption and stabilization mechanisms remained long unclear. Here, we summarize the recent advances in the understanding of NC adsorption regarding kinetics, isotherms, and energetic aspects, as well as their interfacial structure, surface coverage, and contact angle. We thereby distinguish unmodified NCs, covalently modified NCs, and surfactant enhanced adsorption. Unlabelled Image • Review on the adsorption of nanocelluloses at fluid-fluid interfaces regarding kinetics, isotherms, and energetic aspects • Discussion on the interfacial layer structure, coverage, rheology, and contact angle of nanocelluloses at fluid interfaces • Native hydrophilic and hydrophobized nanocelluloses reveal fundamentally different adsorption and interfacial structure • Discussion why nanocelluloses efficiently stabilize emulsions but fail to stabilize foams • Altering nanocellulose surface properties allows the stabilization of foams and inverse, double, or responsive emulsions [ABSTRACT FROM AUTHOR]
ISSN:	00018686
DOI:	10.1016/j.cis.2019.102089