Stimuli-responsive Janus mesoporous nanosheets towards robust interfacial emulsification and catalysis

Jiangyan Yang, Jialin Wang, Yijiang Liu, Huaming Li, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The ability to rationally design and synthesize amphiphilic Janus materials with the selective growth of catalytic species on one side represents an important endeavour towards high-efficiency phase-selective catalysis in heterogeneous reaction. Herein, we report, for the first time, the crafting of smart amphiphilic Janus mesoporous nanosheets (denoted JMNs), selectively decorated with Au nanoparticles (NPs) on the hydrophilic side, for robust and dual-functional interfacial emulsification and catalysis. First, two amphiphilic JMNs are judiciously created (i.e., C18-mSiO2-P4VP composed of mesoporous silica (mSiO2) nanosheets sandwiched by C18 and poly(4-vinylpyridine) (P4VP) on opposite sides of the nanosheets; and C18-mSiO2-NH2 with C18 and NH2 on the respective sides). Subsequently, the in situ growth of Au NPs on the hydrophilic side of the nanosheets yields C18-mSiO2-P4VP@Au and C18-mSiO2-NH2@Au. Notably, these JMNs exhibit pH-dependent catalytic activity in aqueous solution and oil-phase-Type-dependent catalytic activity at the emulsion interface. Moreover, both JMNs manifest reversible interfacial emulsification/de-emulsification behaviour. Finally, they also feature excellent recyclability, rendering them promising in heterogeneous catalysis. In principle, given the diversity of functional polymers that can be easily grafted on mSiO2 nanosheets, a rich variety of JMNs with other stimuli-responsive characteristics (e.g., temperature-, light-, etc.) may be conveniently engineered. As such, a suite of properties (e.g., optical, catalytic, etc.) of these JMNs, triggered by external stimuli noted above, can be scrutinized.

Original languageEnglish
Pages (from-to)3242-3249
Number of pages8
JournalMaterials Horizons
Volume7
Issue number12
DOIs
StatePublished - Dec 2020

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (51603177 and 51674219), the China Postdoctoral Science Foundation (2017M612571), and the Natural Science Foundation of Hunan Province, China (2020JJ5542).

Publisher Copyright:
© The Royal Society of Chemistry.

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