2006 Fiscal Year Final Research Report Summary
Microchemical Processes in Microchannels with Photo-functional Interfaces
| Project/Area Number |
14050024
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KIM Haeng-Boo The University of Tokyo, Graduate School of Engineering, Associate Professor (40186367)
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| Co-Investigator(Kenkyū-buntansha) |
HIBARA Akihide The University of Tokyo, Graduate School of Engineering, Lecturer (30312995)
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| Project Period (FY) |
2001 – 2006
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| Keywords | microchannel / photocatalysis / Laplace pressure / microfluid control / wettability patterning / microelectrode / electrokinetie flow / fluid mixing |
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| Research Abstract |
Integration of various chemical and/or physical functions such as electrodes, catalysts, or controlled wettability surfaces is a promising approach for further development of micro total analysis system (μTAS) or lab-on-chip chemistry. The aim of this research is development of novel microchemical processes by using functional microchannel chips. Brief accomplishments are as follows.
1. Through optimizing bonding procedures in fabrication processes of microchannel chips, we succeed in integration of metal electrodes such as Au, Pt, Ag, and so on, as well as semiconductor electrodes such as TiO_2 in the microchannels without solution leakage. Also, we succeed in modification of the channel surface with silica or titania nanoparticles.
2. As an analytical application of the electrode integrated microchannel chip, we developed electrochemically assisted thermal lens microspectroscopy. Ultrasensitive detection system of non-fluorescent analytes with electrochemical selectivity was successful
… More
ly constructed.
3. Applying the electrode integrated microchannel chip to electrochemical synthesis such as Michael additions, we succeeded in enhancing the current efficiency and selectivity of the reactions.
4. We developed a novel micromixer based on AC electroosmotic flow induced with meandering electrode structure, which allowed fast mixing of solutions in microchannel in ms time scale.
5. Photofunctional interfaces in the microchannel were applied to microfluid control. By using photochromism of spirobenzopyran derivatives, flow-switching device was constructed. Titania nanoparticles-hydrophobic molecules modifying surfaces were used to prepare multistep Laplace valves, which were applied to construct micro batch operation system and oil-water phase separation system.
6. Potential controllable micro photocatalytic reactors were developed by integration of titania film with microchannels. We succeeded in optimization of optical yield of redox-combined photocatalytic reactions such as one-step synthesis of L-pipecolinic acid from L-Lys by applied potential. Less
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