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AssigneeKeio University Faculty of Science and Technology
InventorsTetsuhiko Isobe, Yasushi Hattori, Shigeo Itoh, Hisamitsu Takahashi
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There is provided composite nano-particles comprising nano-crystal particles dispersed stably and individually in suspension in high concentration without mutual aggregation of the nano-particles. A determined amount of pure water or deionized water is poured into a reactor, into which is introduced nitrogen gas at rate of 300 cm3/min for a given time while agitating with a stirrer to remove dissolved oxygen in the pure water, allowing to stand in an atmosphere of nitrogen. Next, the inside of the reactor is maintained in an atmosphere of nitrogen and sodium citrate as a dispersion-stabilizing agent, an aqueous solution of MPS as a surface-modifying agent, an anion aqueous solution for co-precipitation as a nano-crystal and a cation aqueous solution are added, in that order. Then, an aqueous solution of sodium silicate is added to the reactor, which is then allowed to stand in the dark place in an atmosphere of nitrogen after agitation. At that time, a vitrification-inhibiting agent may be added in order to inhibit the growth of glass layer.
A composit nano-particle comprising a core part of a nano-crystal, a surface-modifying part having a bonding part for bonding the periphery of said core part to the nano-crystal and a substance having an insulating shell part having as a substrate a substance forming a glass state, characterized in that the surface of the periphery of said core part is coated with the surface modifying part having the bonding part for bonding to a bond defect of said nano-crystal and the substance having the insulating shell part having as the substrate the substance forming a glass state.
A composite nano-particle composed of three parts comprising a core part of a nano-crystal, a surface-modifying part for coating the surface of said core part to modify the surface, and an insulating shell part the peripheral surface of which is charged by the same charge made up of a substance forming a glass state so as to coat the surface of said surface-modifying part.
A composite nano-particle composed of three parts of a nano-sized composite nano-particle comprising a core part of a nano-crystal, a surface-modifying part for coating the surface of said core part to modify the surface, and an insulating shell part so formed as to coat the surface of said surface-modifying part, characterized in that said core part and said surface-modifying part are formed simultaneously by a co-precipitation method in the presence of both a dispersion stabilizing agent and a surface-modifying agent.
A method of preparing a composite nano-particle comprising the steps of:
A method of preparing a composite nano-particle comprising the steps of:
Dependencies are inferred from the claim text.