Insights into Vapor-Mediated Interactions in a Nanocolloidal Droplet System: Evaporation Dynamics and Affects on Self-Assembly Topologies on Macro- to Microscales
Autor: | Lalit Bansal, Sandeep Hatte, Saptarshi Basu, Angkur Jyoti Dipanka Shaikeea |
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Rok vydání: | 2016 |
Předmět: |
Materials science
Internal flow Mechanical Engineering Nanoparticle Nanotechnology 02 engineering and technology Surfaces and Interfaces Slip (materials science) Velocimetry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Physics::Fluid Dynamics Contact angle Nanoelectronics Electrochemistry General Materials Science 0210 nano-technology Nanoscopic scale Spectroscopy Microscale chemistry |
Zdroj: | Langmuir. 32:10334-10343 |
ISSN: | 1520-5827 0743-7463 |
DOI: | 10.1021/acs.langmuir.6b03024 |
Popis: | Particle-laden droplet-based systems ranging from micro- to nanoscale have become increasingly popular in applications such as inkjet printing, pharmaceutics, nanoelectronics, and surface patterning. All such applications involve multidroplet arrays in which vapor-mediated interactions can significantly affect the evaporation dynamics and morphological topology of precipitates. A fundamental study was conducted on nanocolloidal paired droplets (droplets kept adjacent to each other as in an array) to understand the physics related to the evaporation dynamics, internal flow pattern, particle transport, and nanoparticle self-assembly, primarily using optical diagnostic techniques [such as micro-particle image velocimetry (μPIV)]. Paired droplets exhibit contact angle asymmetry, inhomogeneous contact line slip, and unique single-toroid microscale flow, which are unobserved in single droplets. Furthermore, nanoparticles self-assemble (at the nanoscale) to form a unique variable-thickness (microscale) tilted dome-shaped structure that eventually ruptures at an angle because of evaporation at a nanopore scale to form cavities (miniscale). The geometry and morphology of the dome can be further fine-tuned at a macro- to microscale by varying the initial particle concentration and substrate properties. This concept has been extended to a linear array of droplets to showcase how to custom design two-dimensional drop arrangements to create controlled surface patterns at multiple length scales. |
Databáze: | OpenAIRE |
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