Abstract
Capillary pressures due to the wetting behaviour of a liquid on a material can be exploited to control the pressure drop of the liquid into microchannels. The pressure can be estimated by the Young-Laplace equation and for a given liquid, high values can be achieved by having small microchannel diameters and high wetting contact angles. An original actuation method for a microvalve can be derived from this, if reversible wettability behaviour can be achieved, i.e. the switching between hydrophobic to hydrophilic states implies that the microvalve can be turned on and off. In the present work a wettability controlled microvalve with UV/dark actuation is proposed. The valve microchannels are obtained by laser microdrilling on commercially pure titanium foil. Then the drilled titanium foil is anodic oxidized to grow on the microchannel surfaces a nanostructured TiO2 layer, which exhibits reversible wettability behaviour upon the alternate application of UV and darkness. Finally, the concept is demonstrated in a prototype microvalve controlled between OFF and ON states by UV light application.
| Original language | English |
|---|---|
| Title of host publication | ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 |
| Pages | 533-542 |
| Number of pages | 10 |
| Volume | 5 |
| DOIs | |
| Publication status | Published - 2010 |
| Externally published | Yes |
| Event | ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 - Istanbul, Turkey Duration: 12 Jul 2010 → 14 Jul 2010 |
Conference
| Conference | ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010 |
|---|---|
| Country | Turkey |
| City | Istanbul |
| Period | 12.7.10 → 14.7.10 |
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ASJC Scopus subject areas
- Engineering(all)
Cite this
Laser microdrilling and anodic oxidation of titanium for the manufacturing of a wettability controlled microvalve with UV/DARK actuation. / Demir, Ali Gökhan; Previtali, Barbara; Bestetti, Massimiliano.
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010. Vol. 5 2010. p. 533-542.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Laser microdrilling and anodic oxidation of titanium for the manufacturing of a wettability controlled microvalve with UV/DARK actuation
AU - Demir, Ali Gökhan
AU - Previtali, Barbara
AU - Bestetti, Massimiliano
PY - 2010
Y1 - 2010
N2 - Capillary pressures due to the wetting behaviour of a liquid on a material can be exploited to control the pressure drop of the liquid into microchannels. The pressure can be estimated by the Young-Laplace equation and for a given liquid, high values can be achieved by having small microchannel diameters and high wetting contact angles. An original actuation method for a microvalve can be derived from this, if reversible wettability behaviour can be achieved, i.e. the switching between hydrophobic to hydrophilic states implies that the microvalve can be turned on and off. In the present work a wettability controlled microvalve with UV/dark actuation is proposed. The valve microchannels are obtained by laser microdrilling on commercially pure titanium foil. Then the drilled titanium foil is anodic oxidized to grow on the microchannel surfaces a nanostructured TiO2 layer, which exhibits reversible wettability behaviour upon the alternate application of UV and darkness. Finally, the concept is demonstrated in a prototype microvalve controlled between OFF and ON states by UV light application.
AB - Capillary pressures due to the wetting behaviour of a liquid on a material can be exploited to control the pressure drop of the liquid into microchannels. The pressure can be estimated by the Young-Laplace equation and for a given liquid, high values can be achieved by having small microchannel diameters and high wetting contact angles. An original actuation method for a microvalve can be derived from this, if reversible wettability behaviour can be achieved, i.e. the switching between hydrophobic to hydrophilic states implies that the microvalve can be turned on and off. In the present work a wettability controlled microvalve with UV/dark actuation is proposed. The valve microchannels are obtained by laser microdrilling on commercially pure titanium foil. Then the drilled titanium foil is anodic oxidized to grow on the microchannel surfaces a nanostructured TiO2 layer, which exhibits reversible wettability behaviour upon the alternate application of UV and darkness. Finally, the concept is demonstrated in a prototype microvalve controlled between OFF and ON states by UV light application.
UR - http://www.scopus.com/inward/record.url?scp=79956114422&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79956114422&partnerID=8YFLogxK
U2 - 10.1115/ESDA2010-24237
DO - 10.1115/ESDA2010-24237
M3 - Conference contribution
SN - 9780791849194
VL - 5
SP - 533
EP - 542
BT - ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
ER -