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. 2016 Jun 3;6:26953. doi: 10.1038/srep26953

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(a) Schematic diagram of the experimental setup of oil-in-water emulsions generated by a single co-flow microfluidic capillary, which has heterogeneous surface wettability. The continuous phase is 2% PVA aqueous solution, and the droplet is paraffin oil. (b) The glass micro-capillary, initially hydrophilic, is chemically modified to have a segment of a hydrophobic wall using a mono-layer of Octyltriethoxysilane (OTES) coating. (c) Outline of the experimental procedures to make a micro-capillary with a desired pattern of heterogeneous wettability.