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We employed block copolymer nanolithography to fabricate transparent anti-fogging surfaces in poly(methyl methacrylate) (PMMA). The resulting surfaces comprised a dense array of hexagonally packed pillars of dimensions below the light diffraction limit, with pillar diameters (55±2) nm, pitch size of (73±1) nm, and height to diameter aspect ratio of about one. The surface chemistry was tuned by treatment with low-pressure atmospheric Ar plasma to increase the surface free energy of PMMA from (44.8±0.8) mNm-1 to (53.7±0.5) mNm-1 and to, as a consequence, decrease the intrinsic Young contact angle from θγ=(68±2)°, for pristine PMMA samples, to below 50° for plasma treated samples. This led to a superwetting and thereby an anti-fogging behavior of nanotextured PMMA surface. To confirm the anti-fogging effect over a large area, we present water vapour condensation performance over treated materials, conducted in the customized environmental chamber of controlled humidity and temperature. While the Ar plasma induced superwetting property had a limited lifetime of about four hours, the thin layer deposition approaches were proposed, comprising coating by plasma assisted vapor deposition with inorganic SiOH-rich silica (SiOx) and high resolution sputtering with tungsten (W), separately. This treatments enabled a considerably prolonged lifetime of the superwetting property of almost three months.
|Number of pages||242|
|Publication status||Published - 2018|
- Plasma treatment
- Thin film deposition
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- 1 Finished
15/12/2014 → 06/06/2018