Responsive Janus Composite Nanosheets

Abstract

A general approach is proposed to synthesize Janus polymer/inorganic composite nanosheets. Onto the amine-groupterminated side of the Janus inorganic nanosheets, initiators are covalently bonded. By a favorable grafting from initiator-terminated side, responsive polymers, for example PDEAEMA and PNIPAM, are synthesized by controlled polymerization for example ATRP or RAFT polymerization. Stable emulsions are easily formed in the presence of the Janus nanosheets, which can be easily de-emulsified by subtle changing physicochemical parameters, for example temperature and pH.

Janus graphene oxide nanosheets prepared via Pickering emulsion template

“…Therefore, Janus particles have potential applications in a broad range of fields such as medical target deliveries, biosensors, imaging nanoprobes, self-motile colloidal materials and Pickering interfacial catalysts [8][9][10][11][12]. One of the most important applications of Janus particles is used as solid stabilizers of emulsions and foams due to their truly amphiphilic structure [13][14][15].…”

Lotus leaf inspired robust superhydrophobic coating from strawberry-like Janus particles

“…After selective conjugation of 2-bromoisobutyryl bromide onto the amine group-terminated side (Supplementary Figure S12), polymers (for example, a hydrophobic PS) are grafted by atom transfer radical polymerization. 20 The coarse microstructure is preserved (Figure 3b). The graftings with 2-bromoisobutyryl bromide and PS are confirmed in the Fourier transform infrared spectroscopy spectra (Supplementary Figure S13).…”

Design, Synthesis, and Application of Anisotropic Janus Particles

“…It is noted that such emulsion will be easily demulsified by adjusting pH or temperature. Further, the paramagnetic Fe 3 O 4 nanoparticles were favorably grown onto one side to prevent the Janus sheets and emulsion from being manipulated by the magnetic field [39]. In the same way, the wettability of such dual-responsive sheets can be changed by modifying the temperature [40].…”