student profile: Mr Ming Chiu


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Thesis work

Thesis title: Study of optimization of droplet roll-off on dewetted polymeric patterned surfaces

Supervisors: Chiara NETO , Asaph WIDMER-COOPER

Thesis abstract:

A polymer thin film on a non-wettable substrate is metastable and may be dewetted to a set of isolated droplets over the substrate. Utilizing dewetting technique, robust and efficient practices of fabricating patterned polymer surface have been extensively studied contemporary in many different applications including optoelectronics, bio-related and medicinal industries. Most methods are based on two core components, first to introduce physico-chemical patterning on substrate to incorporate topographical features of interest onto polymer surface, and then mobilize polymer and allow nucleation and spontaneous growth of dewet holes to their final state.
We investigated the dynamic and morphology of dewetting a nanoscale bilayer polymer thin film system composed of polar poly (4-vinylpyridine) (P4VP) on top of polystyrene (PS) that have been coated on flat silicon surface. It was discovered that the process of P4VP solution spreading over PS surface during coating introduces radially aligned holes on the resulting surface. In combination to solvent vapour annealing technique using ethanol, acetone and water, respectively a good, poor and non-solvent for P4VP, patterned polymer surface with different chemical affinity can be easily fabricated in an efficient, up-scalable and reproducible way. With inspiration from nature, this resulting chemically and topographically patterned surface can be applied to fabricate a passive atmospheric water harvesting device.

Selected publications

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Journals

  • Gao, N., Chiu, M., Neto, C. (2017). Receding contact line motion on nanopatterned and micropatterned polymer surfaces. Langmuir, 33(44), 12602-12608. [More Information]
  • Chiu, M., Kee, T., Huang, D. (2012). Coarse-grained simulations of the effects of chain length, solvent quality, and chemical defects on the solution-phase morphology of MEH-PPV conjugated polymers. Australian Journal of Chemistry, 65(5), 463-471. [More Information]

2017

  • Gao, N., Chiu, M., Neto, C. (2017). Receding contact line motion on nanopatterned and micropatterned polymer surfaces. Langmuir, 33(44), 12602-12608. [More Information]

2012

  • Chiu, M., Kee, T., Huang, D. (2012). Coarse-grained simulations of the effects of chain length, solvent quality, and chemical defects on the solution-phase morphology of MEH-PPV conjugated polymers. Australian Journal of Chemistry, 65(5), 463-471. [More Information]

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