Formation and applications of surface nanodroplets

Yu, H 2018, Formation and applications of surface nanodroplets, Doctor of Philosophy (PhD), Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Formation and applications of surface nanodroplets
Author(s) Yu, H
Year 2018
Abstract Nano-scale droplets at the solid-liquid interface are of great relevance for many fundamental phenomena and processes. They also act as the significant units in broad droplet-based technologies, such as lab-on-chip devices, miniaturized analytic technologies, compartmentalized catalytic reactions, fabrication of anti-reflective coatings, high-resolution near-field imaging, and many others. Deriving from the Ouzo effect, the solvent exchange process is a simple, versatile solution-based bottom-up approach for the production of surface nanodroplets by displacement of a good solvent of the droplet liquid by a poor one in a narrow channel in the laminar regime. During this process, an oil over-saturation pulse is created, resulting in the nucleation and growth of nanodroplets on a substrate with the appropriate wettability. This thesis reports the state-of-the-art understanding and applications of surface nanodroplet formation on multiple substrates (planar or curved 2D substrate and 1D substrate) by solvent exchange. The nucleation and growth mechanisms of surface nanodroplets driven by the local oil over-saturation pulse is better understood quantitatively by investigating the effects of gravity, local channel structure, and the dimensions of the substrate. This approach is also feasible at a large scale with a production rate of over millions of droplets per second. Moreover, the surface nanodroplets produced are used as the basic units in the micro-extraction process and the fabrication of surface microstructures. Overall, surface nanodroplet formation by the solvent exchange process is versatile, simple, and controllable, and is therefore highly promising as a droplet-based platform in multiple fields.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Engineering
Subjects Chemical Engineering Design
Colloid and Surface Chemistry
Keyword(s) Solvent exchange
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Created: Mon, 01 Oct 2018, 15:30:52 EST by Adam Rivett
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