Wetting Behavior at Micro-/Nanoscales: Direct Imaging of a Microscopic Water/Air/Solid Three-Phase Interface

Small ◽  
2009 ◽  
Vol 5 (8) ◽  
pp. 908-912 ◽  
Author(s):  
Peipei Chen ◽  
Long Chen ◽  
Dong Han ◽  
Jin Zhai ◽  
Yongmei Zheng ◽  
...  
Keyword(s):  
Phase Interface ◽  
Direct Imaging ◽  
Wetting Behavior ◽  
Three Phase

Surface Topography Induced Ultrahydrophobic Behavior: Effect of Three-Phase Contact Line Topology

2006 ◽  
Author(s):  
Neeharika Anantharaju ◽  
Mahesh Panchagnula ◽  
Wayne Kimsey ◽  
Sudhakar Neti ◽  
Svetlana Tatic-Lucic
Keyword(s):  
Contact Angle ◽  
Contact Line ◽  
Anomalous Behavior ◽  
Contact Angles ◽  
Wet Etching ◽  
Surface Geometry ◽  
Wetting Behavior ◽  
Void Fractions ◽  
Three Phase ◽  
Receding Contact

The wettability of silicon surface hydrophobized using silanization reagents was studied. The advancing and receding contact angles were measured with the captive needle approach. In this approach, a drop under study was held on the hydrophobized surface with a fine needle immersed in it. The asymptotic advancing and receding angles were obtained by incrementally increasing the volume added and removed, respectively, until no change in angles was observed. The values were compared with the previously published results. Further, the wetting behavior of water droplets on periodically structured hydrophobic surfaces was investigated. The surfaces were prepared with the wet etching process and contain posts and holes of different sizes and void fractions. The surface geometry brought up a scope to study the Wenzel (filling of surface grooves) and Cassie (non filling of the surface grooves) theories and effects of surface geometry and roughness on the contact angle. Experimental data point to an anomalous behavior where the data does not obey either Wenzel or Cassie type phenomenology. This behavior is explained by an understanding of the contact line topography. The effect of contact line topography on the contact angle was thus parametrically studied. It was also inferred that, the contact angle increased with the increase in void fraction. The observations may serve as guidelines in designing surfaces with the desired wetting behavior.

Enhancement of interfacial property by novel solid ionomer CsHSO4-H4SiW12O40 for the three-phase interface of a medium-temperature anhydrous fuel cell

2019 ◽  
Vol 253 ◽  
pp. 201-204 ◽  
Author(s):  
Keiichiro Maegawa ◽  
Kyaw Zay Ya ◽  
Wai Kian Tan ◽  
Go Kawamura ◽  
Toshiaki Hattori ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Phase Interface ◽  
Interfacial Property ◽  
Medium Temperature ◽  
Three Phase

Generation of hydrogen peroxide by reduction of oxygen in semihydrophobic trickle electrodes

1991 ◽  
Vol 56 (2) ◽  
pp. 309-316 ◽  
Author(s):  
Otomar Špalek ◽  
Karel Balogh
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Black ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Phase Interface ◽  
Electrochemical Activity ◽  
Polarization Curves ◽  
Electric Resistance ◽  
Graphite Felt ◽  
Three Phase

The reduction of oxygen to hydrogen peroxide was studied in semihydrophobic trickle electrodes prepared from crushed graphite and teflonized carbon black. The potential of these electrodes was found markedly more positive and the peroxide current yields appreciably higher than for electrodes made of used crushed graphite. The reason for this is the higher surface area of the electrodes containing carbon black and occurrence of a three-phase interface in them. The relevant properties, i.e. electric resistance, electrolyte holdup, polarization curves for the oxygen reduction and pexide current yields, were also studied for trickle electrodes containing graphite felt. The electrochemical activity of electrodes made from untreated felt was found rather low but it increased several times when felt pretreated by oxidation was used.

Simultaneous High Conversion and Selectivity in Olefin Oxidation with Oxygen Through Solid/Liquid/Gas Three‐Phase Interface Design

ChemCatChem ◽  
2019 ◽  
Vol 11 (18) ◽  
pp. 4524-4528 ◽  
Author(s):  
Zhaohua Li ◽  
Changyan Cao ◽  
Zhongpeng Zhu ◽  
Lei Jiang ◽  
Weiguo Song
Keyword(s):  
Interface Design ◽  
Phase Interface ◽  
High Conversion ◽  
Olefin Oxidation ◽  
Three Phase ◽  
Solid Liquid

Catalytic Reduction of CO[sub 2] to Ethylene by Electrolysis at a Three-Phase Interface

2003 ◽  
Vol 150 (9) ◽  
pp. D163 ◽  
Author(s):  
Kotaro Ogura ◽  
Hiroshi Yano ◽  
Fukutaro Shirai
Keyword(s):  
Catalytic Reduction ◽  
Phase Interface ◽  
Three Phase
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