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Solvent vapor treatment controls surface wettability in PMMA femtosecond-laser-ablated microchannels |
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| Authors: | Carmela De Marco Shane M Eaton Rebeca Martinez-Vazquez Stefano Rampini Giulio Cerullo Marinella Levi Stefano Turri Roberto Osellame |
| Affiliation: | 1. Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy 2. Istituto di Fotonica e Nanotecnologie (IFN)-CNR, Piazza Leonardo da Vinci 32, 20133, Milan, Italy 3. Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy |
| Abstract: | A solvent vapor treatment was applied to femtosecond-laser-ablated microchannels in PMMA to selectively restore the original hydrophilic wetting behavior of the pristine surface. The hydrophobic surface of the microchannels from the submicron porosity induced by ablation becomes smoother and more transparent after the treatment. This simple and low-cost method, together with suitable masking, can produce wettability patterns that may be exploited to develop passive microfluidic elements such as valves and mixers. |
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