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We started the new group in Jul. 2002. Our research theme is to develop new apploaches leading to soft-material devices with molecular architectures and photoinduced dynamics. "Soft-materials", assembly of orgamic molecules and macromoleculs, show dynamic motions including molecular alignments, phase separations, phase changes, morphological changes and mass transfer. To control these functional properties reveals the prime aspects for advanced soft materials. We propose to photofanctinalize these soft-materials and devices because light have available multiinformation souces, wavelength/energy, intensity, polarity, phase and directivity. The general goal of our group is to actuarize artifically the ultimate soft-material devices, having the intelligent dynamic function like life form. Within this goal, the crucial keys are the self-assembly process for various molecules and macromolecules, on-demand control of molecular assembly and molecular design for diverse interfaces. Our activities are multidisciplinary range from synthsis of new polymers to evaluation their properties directing creation of various devices.

1. Photoalignment of Microphase Separation Structure in Liquid Crystalline Azobenzene Block Copolymer film.

1) Optical alignment and patterning of nanoscale microdomains in a block copolymer thin film, Advanced Materials, 18(7), 883-886 (2006).
2) 3D Photoalignment and Patterning of Microphase Separated Nanostructure in Polystyrene-Based Block Copolymer, Chemistry of Materials, 19(7), 1540-1542 (2007).

2. Structural Colored Soft Materials

LinkIconProf. Takeoka's Pase

3. High Sensitive Photoinduced Surface Relief Systems and their applications.

1) Surface Relief Gratings in Host-guest Supramolecular Materials, Adv. Mater., 12, 1675-1678 (2000).
2) Soft Crosslinkable Azo Polymer for Rapid Surface Relief Formation and Persistent Fixation, Advanced Materials, 1963-1967(2001).
3) Uncoventional Polarization Characterisitic of Rapid Photoinduced Material Motion in Liquid rystalline Azobenzene Polymer Films, Appl. Phys. Lett., 83, 4960-1678 (2002).
4) Phototactic Transport Motions of Polymer Film for Micropatterning and Alignment of Functional Materials, Advanced Materials, 16 (3), 220-223 (2004).
5) Photo-triggered Surface Relief Gratings in Supramolecular Liquid Crystalline Polymer System with Detachable Azobenzene unit, Adv. Mater., 20(3), 516-531 (2008).
6) Highly Photosensitive Surface Relief Gratings Formation in a Liquid Crystalline Azobenzene Polymer: New Implications for the Migration Process, Macromolecules, 40(13), 4607-4613 (2007).

4. Ideal Spread Monolayer Formation of Hydrophobic Polymers

1) Ideal Spread Monolayers and Multilayers Formation of Fully Hydrophobic Polythiophenes via Liquid Crystal Hybridization on Water, Langmuir, 10498-10504 (2008)
2) Ideal Spread Monolayer Formation and Surface Presure Induced Orientation in Poly(9,9’-di-n-octylfluorene-alt-benzothiadiazole) via Hybridization with Liquid Crystal Molecule on Water, Synthetic Metals, in press
3) Abrupt Interfacial Transition of Hydrophobic Polysilanes as Probed via Liquid Crystal-Assisted 4) Stepwise Deposition, J. Am. Chem. Soc., 124, 2074-2075 (2002).
Monolayer Formation of Hydrophobic Polysilane on Water through Hybridization with Liquid Crystal Molecule, Langmuir, 17, 2199-2205 (2001).

5. Surface Nanopatterining with Block Copolymer Langmuir film

1)Formation of a Highly Ordered Dot Array of Surface Micelles of a Block Copolymer via Liquid Crystal-Hybridized Self-Assembly, Langmuir, 22(12), 5233-5236 (2006).

6.Photomechanical Motion for Azobenzene Polymer Assembly in 2-dimentional system.

1) Sohei Kadota, Kenji Aoki, Shusaku Nagano, Takahiro Seki, Photocontrolled Microphase Separation of Block Copolymer in Two Dimensions, J. Am. Chem. Soc., 127(23), 8266-8267 (2005)
2) 2D Nano-phase Separation Structure of Triblock Copolymer Having Azobenzene Aoiety, Polymer Preprints, Japan, 53(2), 3451(2004).
3) Characterization of Monolayer of Photofunctional Block Copolymer Containing Polysiloxane, Polymer Preprints, Japan, 53(2), 3109(2004)

7. Photoaligment Sytems ofMolecular, Macromolecular and Nanostructured Assembly

1) Haruhiko Fukumoto, Shusaku Nagano, Nobuhiro Kawatsuki, Takahiro Seki, Photo-orientation of mesoporous silica thin films on photocrosslinkable polymer films. Adv. Mater., 17(8), 1035-1039 (2005).
2) Photoorientation of Mesostructured Silica via Hierachical Multiple Transfer, Chem. Mater., 14, 2842-2844 (2002).
3) Modeling the Interface Region of Command Surface 1. Structural Evalutations of 4) Azobenzene/Liquid Crystal Hybrid Langmuir Monolayers, J. Phys. Chem. B, 104, 4141-4147 (2000).
5) Photoorientation of Poly(di-n-hexylsilane) by Azobenzene Monolayer, Macromolecules, 35, 2177-2183 (2002).

Department of Molecular &
Macromolecular Cheimstry
Graduate School of Engineering
Nagoya University