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Janus particles
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<p>Janus particles are special types of <a href="/facts/Nanoparticle/k8kNxX4E">nanoparticles</a> or microparticles whose surfaces have two or more distinct <a href="/facts/Physical_property/ujcMUceW">physical properties</a>. This unique surface of Janus particles allows two different types of <a href="/facts/Chemistry/SrNqkGVm">chemistry</a> to occur on the same particle. The simplest case of a Janus particle is achieved by dividing the particle into two distinct parts, each of them either made of a different material, or bearing different functional groups. For example, a Janus particle may have one half of its surface composed of <a href="/facts/Hydrophile/k8p95WYu">hydrophilic</a> groups and the other half <a href="/facts/Hydrophobe/Ifya0CXQ">hydrophobic</a> groups, the particles might have two surfaces of different color, fluorescence, or magnetic properties. This gives these particles unique properties related to their asymmetric structure and/or functionalization. </p>