Hydrophobic-hydrophilic interactions drive rapid nanoparticle assembly
Hydrophobic-hydrophilic interactions drive rapid nanoparticle assembly
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发表时间：
2017-09
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通讯作者：
B. Porter;M. Pacios;H. Bhaskaran
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作者：
B. Porter;M. Pacios;H. Bhaskaran
纳米粒子独特的物理和光学性质使其可靠和快速的组装成为纳米技术的重要目标。为此，许多相互竞争的驱动力已经成为控制自组装的目标，尽管可靠性和效率问题表明纳米尺度上的界面尚未完全理解。在这封信中，我们报告的第一次，从化学纳米图案化的疏水表面和相邻的亲水性区域（Janus接口）之间的界面的水介质的流动可以有效地用于快速纳米粒子组装与单个纳米粒子的分辨率。我们发现，从这个Janus接口的水分子的去湿驱动组装的纳米粒子从静电稳定的纳米粒子胶体到疏水区域，加快通过消除任何水合屏障所施加的润湿界面之间的粘附阻力，使得纳米粒子组装在一分钟内实现。我们称这种可控纳米颗粒组装的方法为Janus界面纳米颗粒组装- JINA。然后，我们证明了通过pH值切换控制这种机制，并证明了其有效性的制造快速创建单纳米粒子网站和单颗粒宽线，同时密集涂层宏观尺度的功能。这种组装方法不仅在纳米制造中具有深远的影响，而且这种机制的不可预见性也挑战了许多关于纳米粒子自组装界面相互作用的普遍假设。
The unique physical and optical properties of nanoparticles make their reliable and rapid assembly an important goal for nanotechnology. To this end, many competing driving forces have been targeted to control the self-assembly, though issues with reliability and efficiency indicate that interfaces on the nanoscale are not yet fully understood. In this letter we report for the first time that the flow of water media from the interface between chemically nanopatterned hydrophobic surfaces and adjacent hydrophilic regions (a Janus interface) can effectively be employed for rapid nanoparticle assembly with single nanoparticle resolution. We find that the dewetting of water molecules from this Janus interface drives the assembly of nanoparticles from electrostatically stabilised nanoparticle colloids onto the hydrophobic areas, expedited by removing the resistance to adhesion between wetted interfaces exerted by any hydration barrier, such that nanoparticle assembly is achieved in under a minute. We call this method of controlled nanoparticle assembly Janus Interface Nanoparticle Assembly - JINA. We then demonstrate control of this mechanism through pH switching and prove its effectiveness for fabrication by rapidly creating single-nanoparticle sites and single particle wide lines whilst simultaneously densely coating macro-scale features. Not only does this assembly method have far-reaching implications in nanomanufacturing, the unanticipated nature of this mechanism also challenges many commonly held assumptions about the interfacial interactions of nanoparticle self-assembly.