Adaptive Structured Pickering Emulsions and Porous Materials Based on Cellulose Nanocrystal Surfactants

Taking advantage of the formation and assembly of cellulose nanocrystal surfactants (CNCSs) at the water–oil interface, where polar cellulose nanocrystals (CNCs) and end‐functionalized polymer chains interact, the preparation and stability of emulsions prepared with CNCSs were investigated. The pack...

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Published inAngewandte Chemie International Edition Vol. 57; no. 41; pp. 13560 - 13564
Main Authors Li, Yanan, Liu, Xubo, Zhang, Zhen, Zhao, Shaojie, Tian, Guifang, Zheng, Jinkai, Wang, Dong, Shi, Shaowei, Russell, Thomas P.
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 08.10.2018
EditionInternational ed. in English
Subjects
Adaptive systems
Cellulose
cellulose nanocrystal surfactants
Drying
Emulsion polymerization
Emulsions
Ionic strength
Jamming
Molecular weight
Nanocrystals
Packing density
pH effects
Pickering emulsions
Pollutants
Polymers
Pore size
Porosity
Porous materials
structured liquids
Surfactants
structured liquids
porous materials
Pickering emulsions
cellulose nanocrystal surfactants
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Summary:Taking advantage of the formation and assembly of cellulose nanocrystal surfactants (CNCSs) at the water–oil interface, where polar cellulose nanocrystals (CNCs) and end‐functionalized polymer chains interact, the preparation and stability of emulsions prepared with CNCSs were investigated. The packing density of CNCSs at the interface can be adjusted by tuning parameters such as pH, ionic strength, and concentration/molecular weight of the end‐functionalized polymer ligands. Stable non‐spherical emulsions are obtained during homogenization, as a result of the interfacial jamming of CNCSs, with pH‐triggered reconfigurability. Porous materials are prepared by freeze‐drying creamed, CNCS‐stabilized emulsions. The cells of the porous materials have a controlled pore size and shape that are commensurate with the droplets in the emulsion and are responsive to pH. The behavior of the adaptive, reconfigurable supracolloidal system is coupled to its internal and surrounding environment. The stability of emulsions prepared at the water–oil interface with cellulose nanocrystal surfactants (CNCSs) were investigated. The packing density can be adjusted by tuning parameters such as pH, ionic strength, and concentration/molecular weight of the end‐functionalized polymer ligands. Stable non‐spherical emulsions are obtained during homogenization with pH‐triggered reconfigurability. Porous materials are prepared by freeze‐drying.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201808888