Interfacial Self-Assembly of Colloidal Nanoparticles in Dual-Droplet Inkjet Printing
Interfacial Self-Assembly of Colloidal Nanoparticles in Dual-Droplet Inkjet Printing
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DOI：
10.1002/admi.201701561
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发表时间：
2018-05-23
影响因子：
5.4
通讯作者：
Zhao, Hong
中科院分区：
文献类型：
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作者：
Al-Milaji, Karam Nashwan;Secondo, Ray Richard;Zhao, Hong
众所周知的咖啡环效应导致胶体颗粒朝向喷墨液滴的接触线对流地输送，从而导致胶体颗粒的不均匀沉积。在这项工作中，胶体颗粒的自组装在一个双液滴喷墨打印配置，以产生一个几乎单层紧密堆积的沉积的胶体颗粒，表现出丰富多彩的反射被证明。通过控制墨水表面张力和喷射参数，含有胶态聚苯乙烯（PS）纳米颗粒的润湿液滴（第二液滴）在撞击时迅速扩散到支撑液滴（第一液滴）上。通过调节润湿液滴的溶剂组合物和PS纳米颗粒的官能化以促进空气-液滴界面处的胶体颗粒之间的网络形成来实现良好有序的沉积。潜在的自组装机制对基底不敏感，并且可以应用于许多其他材料/基底组合。最后，颜色产生的起源是突出的，和潜在的双液滴喷墨印刷工艺的光学器件的制造进行了讨论。
The well-known coffee-ring effect causes colloidal particles to convectively transport toward the contact line of an inkjet droplet leading to a nonuniform deposition of the colloidal particles. In this work, the self-assembly of colloidal particles in a dual-droplet inkjet printing configuration to produce a nearly monolayer closely packed deposition of colloidal particles that exhibits a colorful reflection are demonstrated. By controlling the ink surface tensions and jetting parameters, the wetting droplets (the second droplet) containing colloidal polystyrene (PS) nanoparticles quickly spread over the supporting droplets (the first droplet) upon impact. The well-ordered deposition is achieved by tuning the solvent composition of the wetting droplets and functionalization of the PS nanoparticles to encourage a network formation among the colloidal particles at the air-droplet interface. The underlying self-assembly mechanism is insensitive to substrates and can be applied to many other material/substrate combinations. Finally, the origin of the color generation is highlighted, and the potential of the dual-droplet inkjet printing process is discussed for fabrication of optical devices.