Figure 2: SEM images of conical PDMS needles and arrays. | Nature Communications

Figure 2: SEM images of conical PDMS needles and arrays.

From: Structured cone arrays for continuous and effective collection of micron-sized oil droplets from water

Figure 2

(a) SEM image of a smooth PDMS needle. (b) SEM image of a rough PDMS needle. (c) Enlarged image of a smooth PDMS needle. (d) Enlarged image of a rough PDMS needle. After spraying the oil–water mixture for 30 s, the needle in (b) showed a larger weight change (−3.66±0.42 mg) than the needle in (a) (−2.61±0.53 mg). (e) SEM image of an array of smooth PDMS needles. (f) SEM image of an array of rough PDMS needles. Scale bars, (a,b): 100 μm; (c,d): 5 μm; (e,f): 500 μm.

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