Co-assembly of oppositely charged particles into linear clusters and chains of controllable length.
Co-assembly of oppositely charged particles into linear clusters and chains of controllable length.
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DOI：
10.1038/srep01004
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发表时间：
2012
影响因子：
4.6
通讯作者：
Velev, Orlin D.
中科院分区：
文献类型：
--
作者：
Bharti, Bhuvnesh;Findenegg, Gerhard H.;Velev, Orlin D.
具有强吸引力相互作用的胶体颗粒在接触时突然断裂并形成永久但无序的聚集体。相比之下，交流电场允许通过介电泳（DEP）从排斥粒子定向组装链或晶体，但一旦电场关闭，这些结构就会崩溃。我们展示了如何通过将 DEP 应用于带相反电荷的微球混合物来组装组织良好、永久的微米级颗粒簇和链。我们发现形成的链的长度取决于两个物种的尺寸比以及数量比，并为这种组装机制制定了统计模型，该模型与实验结果非常吻合。这项研究得出的组装规则构成了定制新型永久性超胶体簇和凝胶的基础。
Colloidal particles with strongly attractive interactions snap on contact and form permanent, but disordered aggregates. In contrast, AC electric fields allow directional assembly of chains or crystals from repulsive particles by dielectrophoresis (DEP), but these structures fall apart once the field is switched off. We demonstrate how well-organized, permanent clusters and chains of micron-sized particles can be assembled by applying DEP to mixtures of oppositely charged microspheres. We found that the length of the formed chains depends on size ratio as well as the number ratio of the two species, and formulated a statistical model for this assembly mechanism, which is in excellent agreement with the experimental results. The assembly rules resulting from this study form a basis for tailoring new classes of permanent supracolloidal clusters and gels.
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影响因子：
64.8
作者：
Dreyfus, R;Baudry, J;Bibette, J
通讯作者：
Bibette, J
影响因子：
56.9
作者：
Hermanson, KD;Lumsdon, SO;Velev, OD
通讯作者：
Velev, OD
影响因子：
3.9
作者：
Piech, M;George, MC;Braun, PV
通讯作者：
Braun, PV
影响因子：
3.9
作者：
Lumsdon, SO;Kaler, EW;Velev, OD
通讯作者：
Velev, OD
影响因子：
3.4
作者：
Gupta, Shalini;Alargova, Rossitza G.;Velev, Orlin D.
通讯作者：
Velev, Orlin D.