Reversible Electrowetting of Vertically Aligned Superhydrophobic Carbon Nanofibers
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- 作者：Manjeet S. Dhindsa ; Neil R. Smith ; Jason Heikenfeld ; Philip D. Rack ; Jason D. Fowlkes ; Mitchel J. Doktycz ; Anatoli V. Melechko ; Michael L. Simpson
- 刊名：Langmuir
- 出版年：2006
- 出版时间：October 10, 2006
- 年：2006
- 卷：22
- 期：21
- 页码：9030 - 9034
- 全文大小：308K
- 年卷期：v.22,no.21(October 10, 2006)
- ISSN：1520-5827
文摘
Reversible electrostatically induced wetting (electrowetting) of vertically aligned superhydrophobic carbon nanofibershas been investigated. Carbon nanofibers on a 5 × 5 
m pitch were grown on Si substrates, electrically insulated witha conformal dielectric, and hydrophobized with fluoropolymer. This nanostructured scaffold exhibited superhydrophobicbehavior for saline (
160
). Electrowetting induced a contact angle reduction to 100. Competitive two-liquid(dodecane/saline) electrowetting exhibited reversibility on the same nanostructured scaffold. Without applied bias,ultra-fine-point tip (~25 nm radius) nanofibers result in effectively zero capacitance with the overlying saline layer.Complete electrowetting of the substrate is confirmed as capacitance values increase by several orders of magnitudewith increased wetting. These results demonstrate the applicability of reversible electrowetting on nanostructuredscaffolds and use of nanofabricated structures that can be integrated with various micro- and nanoelectronic technologies.
m pitch were grown on Si substrates, electrically insulated witha conformal dielectric, and hydrophobized with fluoropolymer. This nanostructured scaffold exhibited superhydrophobicbehavior for saline ( 160). Electrowetting induced a contact angle reduction to 100. Competitive two-liquid(dodecane/saline) electrowetting exhibited reversibility on the same nanostructured scaffold. Without applied bias,ultra-fine-point tip (~25 nm radius) nanofibers result in effectively zero capacitance with the overlying saline layer.Complete electrowetting of the substrate is confirmed as capacitance values increase by several orders of magnitudewith increased wetting. These results demonstrate the applicability of reversible electrowetting on nanostructuredscaffolds and use of nanofabricated structures that can be integrated with various micro- and nanoelectronic technologies.