〜Welcome to Takahara Laboratory's HP〜
Institute for Materials Chemistry and Engineering, Kyushu University
744 Motooka, Nishi-ku, Fukuoka 819-0395, JAPAN
Tel: +81-92-802-2516 Fax: +81-92-802-2518
Section of Supramolecular Chemistry
Chemistry of Supramolecular Assemblies
The purpose of the research is to establish the method to control 2-D
and 3-D of molecularly organized organic ultra thin films.
The polymerized organosilane monolayers with various functional groups at the hydrophobic ends were immobilized on the silicone wafer substrate either by Langmuir-Blodgett (LB) method or chemical vapor -phase deposition.
Patterning of polymer thin film was achieved by clean lithography technique employing vacuum ultraviolet (VUV) light.
After VUV lithography followed by the chemisorption of the second component, a novel multiphase surfase with defferent surfase chemistry can be prepared.
Also ,by selective chemical conversion of the functional groups of the certain area and subsequent immobilization of second or third layers, a novel three-demensionl nano-structure can be prepared.
The interaction between biological molecule and polymer surfase pays an
important role in biological molecules.
The two-demensionally controlled polymer surfase has been prepared and the interaction between protein and surfases was studied based on scanning force micriscopy (SFM), surfase plasmon resonance spectroscopy (SPR), and infra-red spectroscopy.
it has been revealed that the strong hydrophobic interaction induced the denaturation of the adosorbed protein.
Also, the mechanism on the selective adsorption of plasma protein onto phase separation was explained based on the electrostatic repulsion between adsorbed protein and protein in the solution.
Natural inorganic nonfiber "imogolite" and nanoparticle "allophane"
can be found out in volcano ash or weatherd pumice.
The purpose of this reseach is to propose a method to prepare novel "green nanohybrid" from natural inorganic nanofiller and biodegradable polymers.
Imogolite and allophane can be separated from weathered pumice.
Atomic force micriscopic observation revealed that the imogolite molecules form fibrous network at pH=3.0.
Since the outermost surfaces of imogolite and allophane are coverd with Al-OH groups, a strong interaction can be expected between Al-OH and organic molecules with -PO(OH)2 group.
Organic molecules and oligomers with -PO(OH)2 group can be chemisorbed onto the surfases of imogolite and allophane.
An increase in affanity of organophied imogolite and allophane to synthetic polymer was achieved.
It is expected that molecularly dispersed imogolite and allophane wil improve physicochemical properties of polymeric materials.
Also, an attempt will be made to prepare a green nanohybrid from biodegradable polymers.
The understanding the interaction force between various functional groups
is important for construction of molecular assembly.
Attempts have been made on the evaluation of the force between various functional groups by using scanning force microscopy (SFM).
In theory, enantiomer surface should have identical physical, mechanical and wetting properties.
However, the surface immobilized chiral molecule can distinguish the enantiomer.
Then, the question arises whether the SFM can directly discriminate different chirality.
Chiral functional groups were immobilized on the cantilever tip and the substrate.
The adhension forces between chiral functional groups were evaluated from the force-distance curve of atomic force microscopy.
Preliminary investigation revealed that the adhension force between R-AETA [(1-(9-anthryl)-2,2,2-trifluoroethoxy)acetic acid] and S-DNBP[N-(3,5-dinitrobenzoyl)phenylglycine] was larger than that between S-DNBP and S-AETA because of the presense of three point interactions.
A new neutron reflectometer (ARISA) with vertical scattering-plane geometry
for studying free surface was installed at a thermal neutron port viewing
an ambient-temperature water moderator at KENS.
AT is a member of instrumentation of ARISA at KENS.
ARISA is a unique reflectometer using thermal neutrons at a pulsed spallation neurton source as well as the first neutron reflectometer with vertical scattering-plane geometry in Japan.
An inner iron collimator with two beam holes and neutron beam-line shield were installed to minimize high-energy neutrons directry coming from the neutron-target due to the shield loss produced by beam holes themselves.
The inne collomator makes two independent downward beam holes with different angles, 0 - 0.47 and 1.4.
The neutron beam-line shield has function of an additional beam-shutter as well.
The designed specifications for the coverd range of neutron momentum transfer, qz, in the vertical direction are 0.08 nm-1 - 0.6 and 0.08 nm-1 -2.8 nm-1 for liquid and solid samples, respectively, using the neutrons with 0.05 - 0.4 nm wavelengths.
Precise control of macromolecular architecture is an important theme in
recent polymer science, because it is one significant methodology to produce
novel and/or improved properties of the polymer materials.
Recent advancement of controlled radical polymerization systems has enabled us to apply living polymerization methods, which results in the synthesis of a wide variety of new polymers and, in particular, functionalized polymers with predetermined molecular weights and properties.
The purpose of this research is to construct a supramolecular system and novel (organic/inorganic) hybrid system based on such precise macromolecular design.
福岡市西区元岡744 CE41棟 2F