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CO2-switchable emulsions with controllable size and viscosity.

ABSTRACT: CO2-responsive emulsions have attracted considerable attention in recent years because of their biocompatibility and easy removal of CO2. However, most CO2-responsive emulsions are only used in stabilization and demulsification processes. In this paper, we report CO2-switchable oil-in-dispersion (OID) emulsions co-stabilized with silica nanoparticles and anionic NCOONa, in which the required concentrations of NCOONa and silica particles were as low as 0.01 mM and 0.0001 wt%, respectively. Besides reversible emulsification/demulsification, the aqueous phase containing the emulsifiers was recycled and reused with the CO2/N2 trigger. More importantly, the properties of the emulsions, such as droplet sizes (40-1020 μm) and viscosities (6-2190 Pa s), were intelligently controlled by the CO2/N2 trigger, and meanwhile reversible conversion between OID emulsions and Pickering emulsions was achieved. The present method offers a green and sustainable way to regulate the emulsion states, which enables smart control of emulsions and widens their potential applications.

SUBMITTER: Jiang J 

PROVIDER: S-EPMC10034261 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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CO<sub>2</sub>-switchable emulsions with controllable size and viscosity.

Jiang Jianzhong J   Li Huaixin H   Gu Yao Y  

Chemical science 20230227 12

CO<sub>2</sub>-responsive emulsions have attracted considerable attention in recent years because of their biocompatibility and easy removal of CO<sub>2</sub>. However, most CO<sub>2</sub>-responsive emulsions are only used in stabilization and demulsification processes. In this paper, we report CO<sub>2</sub>-switchable oil-in-dispersion (OID) emulsions co-stabilized with silica nanoparticles and anionic NCOONa, in which the required concentrations of NCOONa and silica particles were as low as  ...[more]

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