Janus particles

A schematic view of a basic spherical Janus particle with two distinct faces: Sides A and B represent two surfaces with different physical or chemical properties.

Schematic view of the synthesis of Janus nanoparticles via masking. 1) Homogeneous nanoparticles are placed in or on a surface in such a way that only one hemisphere is exposed. 2) The exposed surface is exposed to a chemical 3) which change its properties. 4) The masking agent is then removed, releasing the Janus nanoparticles.

(a) Schematic representation of a masking microfabrication process. After creating a monolayer of fluorescent particles, bilayers of 1:10 Ti/Au are deposited on the top half of particles. The wafer is then placed in a beaker with 2 ml DI water and sonicated for 2 h to resuspend them. (b) SEM micrographs show the three types of JPs fabricated. Scale bar represents 500 nm.[15]

Schematic representation of the synthesis of Janus nanoparticles using the block copolymer self-assembly method

Janus particles are special types of nanoparticles whose surfaces have two or more distinct physical properties. This unique surface of Janus nanoparticles allows two different types of chemistry to occur on the same particle. The simplest case of a Janus nanoparticle is achieved by dividing the nanoparticle into two distinct parts, each of them either made of a different material, or bearing different functional groups. For example, a Janus nanoparticle may have one-half of its surface composed of hydrophilic groups and the other half hydrophobic groups. This gives these particles unique properties related to their asymmetric structure and/or functionalization. A recent comprehensive review article by Walther et al. covering all aspects from synthesis to self-assembly, novel physical properties and applications is available at Chemical Reviews.

单词	Janus particles
释义	Janus particles 英语百科 Janus particles Janus particles are special types of nanoparticles whose surfaces have two or more distinct physical properties. This unique surface of Janus nanoparticles allows two different types of chemistry to occur on the same particle. The simplest case of a Janus nanoparticle is achieved by dividing the nanoparticle into two distinct parts, each of them either made of a different material, or bearing different functional groups. For example, a Janus nanoparticle may have one-half of its surface composed of hydrophilic groups and the other half hydrophobic groups. This gives these particles unique properties related to their asymmetric structure and/or functionalization. A recent comprehensive review article by Walther et al. covering all aspects from synthesis to self-assembly, novel physical properties and applications is available at Chemical Reviews.
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