Substrate wettability guided oriented self assembly of Janus particles
| Autor: | Rabibrata Mukherjee, Meneka Banik, Shaili Sett, Chirodeep Bakli, Suman Chakraborty, A. K. Raychaudhuri |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Spin coating
Multidisciplinary Materials science Science Substrate (chemistry) Nanotechnology Janus particles Self-assembly 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences Amphiphile Medicine Colloids Wetting Janus 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Scientific Reports Scientific Reports, Vol 11, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2045-2322 |
| Popis: | Self-assembly of Janus particles with spatial inhomogeneous properties is of fundamental importance in diverse areas of sciences and has been extensively observed as a favorably functionalized fluidic interface or in a dilute solution. Interestingly, the unique and non-trivial role of surface wettability on oriented self-assembly of Janus particles has remained largely unexplored. Here, the exclusive role of substrate wettability in directing the orientation of amphiphilic metal-polymer Bifacial spherical Janus particles, obtained by topo-selective metal deposition on colloidal Polymestyere (PS) particles, is explored by drop casting a dilute dispersion of the Janus colloids. While all particles orient with their polymeric (hydrophobic) and metallic (hydrophilic) sides facing upwards on hydrophilic and hydrophobic substrates respectively, they exhibit random orientation on a neutral substrate. The substrate wettability guided orientation of the Janus particles is captured using molecular dynamic simulation, which highlights that the arrangement of water molecules and their local densities near the substrate guide the specific orientation. Finally, it is shown that by spin coating it becomes possible to create a hexagonal close-packed array of the Janus colloids with specific orientation on differential wettability substrates. The results reported here open up new possibilities of substrate-wettability driven functional coatings of Janus particles, which has hitherto remained unexplored. |
| Databáze: | OpenAIRE |
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