Janus Particle

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Janus Particle

Janus particles are particles whose surfaces of both hemispheres are different from a chemical point of view. The term Janus came from the Roman god Janus, who was usually represented with two heads placed back to back. Research on Janus nanoparticles has been thriving over the past few years, focusing both on novel preparation strategies and on investigations of their unique properties. As a result of presenting two different regions simultaneously, Janus nanoparticles can be designed to have different hydrophobicity and thereby mimic the behavior of surfactants, they can also form stable clusters with defined size, and substantially reduce the interfacial tension between two different phases. Generally, Janus nanoparticles bring together different materials in a segregated manner at the nanoscale, thus combining different properties in single entity, as in the case of heterodimers.

The Interaction potential between different sides of Janus particles. Reprinted from Jiang, Shan, et al. Advanced materials 2010.

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