Rational Design and Synthesis of Janus Composites

Abstract

Janus composites with two different components divided on the same object have gained growing interest in many fields, such as solid emulsion stabilizers, sensors, optical probes and self-propellers. Over the past twenty years, various synthesis methods have been developed including Pickering emulsion interfacial modification, block copolymer self-assembly, microfluidics, electro co-jetting, and swelling emulsion polymerization. Anisotropic shape and asymmetric spatial distribution of compositions and functionalities determine their unique performances. Rational design and large scale synthesis of functional Janus materials are crucial for the systematical characterization of performance and exploitation of practical applications.

Structure-tunable Janus fibers fabricated using spinnerets with varying port angles

“…The latter, being a heterojunction structure, can have an advantage for designing novel functional nanomaterials over the core-shell structures because it provides an opportunity for both components to interact with their surroundings. 22,23 Side-by-side electrospinning involves a complex interplay between fluid dynamics, electrodynamics and rheology, and presents a challenge in controlling the movement in unison of two fluids in a side-by-side manner under an electrical field from spinneret to collector. To our knowledge, Gupta and Wilkes were the first to report the preparation of side-by-side polymer nanofibers, made of poly(vinyl chloride)/segmented polyurethane and poly(vinyl chloride)-poly(vinylidiene fluoride) using a spinneret consisting of two parallel Teflon capillaries.…”

Ordered arrays of pumpkin-shaped Janus particles with tailored surface morphologies via microcontact hot embossing

“…Hereinto, exploration of inexpensive, inherently parallel and high-throughput fabrication methods is one of the focuses of Janus particle-related researches [12][13][14][15][16][17]. Recently, Müller et al have summarized various manufacture procedures for Janus particles [4].…”

Janus nanosheets by emulsion interfacial crosslinking of reactive surfactants

“…Janus colloidal materials with two different compositions compartmentalized within one particle have shown promisng performences and diversify potential applications [1][2][3][4][5][6]. Compared with traditional spherical Janus particles, twodimentional (2D) sheet-like (or disk-like) Janus materials have gained growing interest due to their highly anisotropic shape beside asymmetric chemistry [7,8].…”