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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Nayak, K. Kulkarni, P.D. Deepu, A. Sitaraman, V.R. Punidha, S. Saha, A.A. Ravikanth, M. Mitra, S.K. Mukherji, S. Ramgopal Rao, V. |
| Copyright Year | 2007 |
| Description | Author affiliation: Centre for Res. in Nanotechnol. & Sci., Indian Inst. of Technol. Bombay, Mumbai (Nayak, K.; Kulkarni, P.D.; Deepu, A.; Sitaraman, V.R.; Punidha, S.; Saha, A.A.; Ravikanth, M.; Mitra, S.K.; Mukherji, S.; Ramgopal Rao, V.) |
| Abstract | In order to achieve patterned surfaces for microfluidic applications, we show for the first time the use of self-assembled monolayer (SAM) of Hydroxy-phenyl porphyrin on $SiO_{2}$ surface following a chemical procedure. The SAM was characterized using ground state UV-absorption spectroscopy and $H_{2}O$ contact angle measurements. The UV-absorption spectra of the SAM exhibited a ~ 8 nm red shift in the Soret band compared to the porphyrin in toluene. This indicated the side-by-side orientation of the self assembled porphyrin molecules on $SiO_{2}.$ The molecular self-assembly is expected to be randomly oriented because of amorphous nature of the substrate. Sessile deionized (DI) water drop of 50 muL on SAM exhibited a contact angle of 75plusmn3. which is significantly higher than the contact angle of 33plusmn2. measured on the $SiO_{2}$ substrate. In this paper, we also demonstrate an approach of patterning the $SiO_{2}$ surface with the porphyrin SAM in order to achieve alternate hydrophobic/hydrophilic surfaces on a p-type device-quality (111) Si wafer. The application of such patterned surfaces is demonstrated with the help of microfluidic simulations study. A three-dimensional numerical simulation of flow in patterned microchannels with alternate layers of hydrophilic and hydrophobic surfaces at the bottom wall is studied here. Volume of fluid method (VOF) is used for simulating the free surface flow in the microchannel. Non-symmetric meniscus profiles with varying amplitude and shapes are obtained by changing the contact angles of the hydrophilic and hydrophobic surfaces. Flow instability is found to increase in the microchannels with patterned surfaces containing a variation in contact angles. |
| Starting Page | 1235 |
| Ending Page | 1239 |
| File Size | 234994 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781424406074 |
| DOI | 10.1109/NANO.2007.4601406 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-08-02 |
| Publisher Place | Hong Kong |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Gold Substrates Microchannel Surface treatment Microfluidics Silicon Numerical models UV Contact angle capillary flow microchannel patterned surface porphyrin SAM |
| Content Type | Text |
| Resource Type | Article |
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