A Pickering Emulsion Route to Swimming Active Janus Colloids.
A Pickering Emulsion Route to Swimming Active Janus Colloids.
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DOI：
10.1002/advs.201700528
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Ebbens SJ
中科院分区：
文献类型：
--
作者：
Archer RJ;Parnell AJ;Campbell AI;Howse JR;Ebbens SJ
活性胶体领域正在引起人们的极大兴趣，既可以实现应用，也可以研究新的集体胶体现象。一种已被广泛研究的方便的活性胶体系统是球形 Janus 颗粒，其中半球形铂涂层可分解过氧化氢以产生快速运动。然而，目前生产这些活性胶体依赖于物理气相沉积（PVD）工艺，该工艺难以规模化并且需要昂贵的设备。在这项工作中，证明了 Pickering 乳液掩蔽与溶液相金属化相结合可以产生自驱动催化 Janus 颗粒。与 PVD 胶体的运动和催化活性的比较表明，由于沉积涂层的颗粒性质，给定厚度的铂具有更高的催化活性。这种基于皮克林乳液的方法将有助于生产用于未来应用的活性胶体，并有助于对各种活性胶体现象进行实验研究。
The field of active colloids is attracting significant interest to both enable applications and allow investigations of new collective colloidal phenomena. One convenient active colloidal system that has been much studied is spherical Janus particles, where a hemispherical coating of platinum decomposes hydrogen peroxide to produce rapid motion. However, at present producing these active colloids relies on a physical vapor deposition (PVD) process, which is difficult to scale and requires access to expensive equipment. In this work, it is demonstrated that Pickering emulsion masking combined with solution phase metallization can produce self‐motile catalytic Janus particles. Comparison of the motion and catalytic activity with PVD colloids reveals a higher catalytic activity for a given thickness of platinum due to the particulate nature of the deposited coating. This Pickering emulsion based method will assist in producing active colloids for future applications and aid experimental research into a wide range of active colloid phenomena.
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作者：
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