Diverging Effects of Topographical Continuity on the Wettability of a ...
Supporting Information
Diverging Effects of Topographical Continuity on the Wettability of a Rough Surface Sang-Uk Cho1,‡, Doo-In Kim2,‡,, Won Kyoung Cho3, Bo Sung Shin3,4 and Myung Yung Jeong3,* 1
Department of Cogno-mechatronics Engineering, Pusan National University, Busan 609-
735, Korea, 2BK21+Nano-integrated Cogno-mechatronics Engineering, Pusan National University, Busan 609-735, Korea, 3Department of Opto-mechatronics Engineering, Pusan National University, Busan 609-735, Korea, 4Convergence Research Center of 3D Laseraided Innovative Manufacturing Technology(CRC/3D_LIMIT), Pusan National University, Busan 609-735, Korea. Corresponding Author *E-mail: [email protected]
S-1
Table S1. Contact angle hysteresis for the micro-patterned fluorine coating and the Si. Surface parameter ξ 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1
Fluorine coating Pillar
Hole
26.6 26.6 27.7 29.3 30.6 46.8 42.6
37.4 38.1 40.5 31.6 47.5 38.7 32.4 12.9
Si Throughhole 48.4 38.3 44 46.1 31.1 36.3 26.3
S-2
Pillar
Hole
26.1 30.2 38.3 36.5 48.3 44.9 50.8
20.3 22.8 26.3 21.5 24.6 24.3 22.3 6.4
Throughhole -
Figure S1. Micro-pattern array fabrication process employing conventional photolithography technique. The fabricated micro-pillar and the micro-hole arrays were used as the master stamps for the imprinting process of the polymer-based photoresist and the polydimethylsiloxane (PDMS), respectively.
S-3
Figure S2. The measured static CA and CAH with Hydrogen peroxide solution (3:7 H2O2:H2O) (a) and methanol (b) on the fluorine-coated micro-patterns. The upper bar and lower bar indicate the advancing angle and receding angle, respectively. The CA of hydrogen peroxide solution (γLV=74.2 mNm-1) increase monotonically as the surface parameter decreases while the CA of methanol (γLV=22.5 mNm-1) is highly influenced by the surface pattern and the surface parameter. S-4
Figure S3. The apparent CA measured from the bare Si and the fluorine coatings with pillar ((a) and (b)), hole ((c) and (d)) and through-hole ((e) and (f)) patterns are shown with various impact distance between water droplet and patterned surfaces. Significant decrease in CA was observed in the bare Si with patterns, and the CA of the through-hole-patterned Si was highly influenced by the impact distance. S-5
Diverging Effects of Topographical Continuity on the Wettability of a Rough Surface Sang-Uk Cho1,‡, Doo-In Kim2,‡,, Won Kyoung Cho3, Bo Sung Shin3,4 and Myung Yung Jeong3,* 1
Department of Cogno-mechatronics Engineering, Pusan National University, Busan 609-
735, Korea, 2BK21+Nano-integrated Cogno-mechatronics Engineering, Pusan National University, Busan 609-735, Korea, 3Department of Opto-mechatronics Engineering, Pusan National University, Busan 609-735, Korea, 4Convergence Research Center of 3D Laseraided Innovative Manufacturing Technology(CRC/3D_LIMIT), Pusan National University, Busan 609-735, Korea. Corresponding Author *E-mail: [email protected]
S-1
Table S1. Contact angle hysteresis for the micro-patterned fluorine coating and the Si. Surface parameter ξ 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1
Fluorine coating Pillar
Hole
26.6 26.6 27.7 29.3 30.6 46.8 42.6
37.4 38.1 40.5 31.6 47.5 38.7 32.4 12.9
Si Throughhole 48.4 38.3 44 46.1 31.1 36.3 26.3
S-2
Pillar
Hole
26.1 30.2 38.3 36.5 48.3 44.9 50.8
20.3 22.8 26.3 21.5 24.6 24.3 22.3 6.4
Throughhole -
Figure S1. Micro-pattern array fabrication process employing conventional photolithography technique. The fabricated micro-pillar and the micro-hole arrays were used as the master stamps for the imprinting process of the polymer-based photoresist and the polydimethylsiloxane (PDMS), respectively.
S-3
Figure S2. The measured static CA and CAH with Hydrogen peroxide solution (3:7 H2O2:H2O) (a) and methanol (b) on the fluorine-coated micro-patterns. The upper bar and lower bar indicate the advancing angle and receding angle, respectively. The CA of hydrogen peroxide solution (γLV=74.2 mNm-1) increase monotonically as the surface parameter decreases while the CA of methanol (γLV=22.5 mNm-1) is highly influenced by the surface pattern and the surface parameter. S-4
Figure S3. The apparent CA measured from the bare Si and the fluorine coatings with pillar ((a) and (b)), hole ((c) and (d)) and through-hole ((e) and (f)) patterns are shown with various impact distance between water droplet and patterned surfaces. Significant decrease in CA was observed in the bare Si with patterns, and the CA of the through-hole-patterned Si was highly influenced by the impact distance. S-5
