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Supercritical Hydrothermal Synthesis of Organic Inorganic Biomolecule Hybrid Nano Particles

T. Adschiri, S. Takami, M. Umetsu and S. Ohara
Tohoku University, JP

nanoparticle, supercritical, hydrothermal synthesis, hybrid

This paper describes specific features of supercritical hydrothermal synthesis method: 1) rapid nanoparticles production, 2) morphology control with a little change of temperature or pressure, 3) control of oxidation state by introducing oxygen or hydrogen gas, and 4) highly crystallized single crystal formation. By introducing organic substances including biomolecules in a reaction atmosphere of supercritical hydrothermal synthesis, nanoparticles whose surface was modified with organic materials were synthesized. In supercritical state, water and organic materials form a homogeneous phase, which provides an excellent reaction atmosphere for the organic modification of nanoparticles. Modification with bio-materials including amino acids was also possible. By changing organic modifiers, particle morphology and crystal structure were changed. This organic surface modification provides a various unique characteristics for the nanoparticles: Dispersion of nanoparticles in aqueous solutions, organic solvents or in liquid polymers can be controlled by selecting hydrophilic or hydrophobic modifiers. Polymer-like materials can be formed for the amino acid modified nanoparticles probably by the self-assembly of amino acid.

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