Patents by Inventor Akiko Toyotama
Akiko Toyotama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220213613Abstract: A colloidal crystal having a diamond lattice structure, including: a first layer in which a first plurality of particles are arranged to form a plane of a face-centered cubic lattice structure; a second layer in which a second plurality of particles are arranged on the first layer in contact with the first particles; and a third layer in which a third plurality of particles are arranged on the second layer in contact with the second particles, wherein the colloidal crystal includes at least one layer of each of the first layer, the second layer and the third layer.Type: ApplicationFiled: March 24, 2022Publication date: July 7, 2022Inventors: Junpei YAMANAKA, Akiko Toyotama, Tohru Okuzono, Minori Fujita, Yurina Aoyama, Madoka Minami
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Publication number: 20200405590Abstract: [Object] To provide a decorative aqueous composition that includes particles formed from opal-type colloidal crystals uniformly and stably dispersed in an aqueous dispersion medium, and exhibits a structural color due to interference of light, and to provide a method for producing the decorative aqueous composition. [Solution] The decorative aqueous composition of the present invention contains particles of opal-type colloidal crystals dispersed in an aqueous dispersion medium in which a polymer is dissolved. The particles of the opal-type colloidal crystals are made from hydrophilic colloidal particles having an average particle diameter ranging from 10 nm to 1000 nm with a variation coefficient of the particle diameter being within 20%. Therefore, the decorative aqueous composition of the present invention contains opal-type colloidal crystals uniformly and stably dispersed in an aqueous dispersion medium, and exhibits a structural color due to interference of light.Type: ApplicationFiled: February 18, 2019Publication date: December 31, 2020Applicants: PUBLIC UNIVERSITY CORPORATION NAGOYA CITY UNIVERSITY, DAICEL CORPORATIONInventors: Junpei YAMANAKA, Akiko TOYOTAMA, Tohru OKUZONO, Ruri YAMAMOTO, Ayanori FUKUSHIMA, Yui SATOU, Yuichi SAKANISHI, Hitomi FUKUDA
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Patent number: 10675604Abstract: [Object] Provided are a “eutectic colloidal crystal” which is an aggregate of plural kinds of colloidal crystals having different lattice constants, a solidified body of the eutectic colloidal crystal, and methods for producing them. [Resolution means] The eutectic colloidal crystal of the present invention contains two or more kinds of colloidal crystals composed of substantially monodispersed colloidal particles having different particle sizes. This eutectic colloidal crystal is obtained by providing a colloidal dispersion of two or more kinds of colloidal particles having different particle sizes, and a polymer which will not substantially adsorb to the colloidal particles (the coefficient of variation in particle size of these colloidal particles is less than 20%) dissolved in a dispersion medium (dispersion preparation process), and allowing the colloidal dispersion to stand (eutectoid process).Type: GrantFiled: December 2, 2015Date of Patent: June 9, 2020Assignee: PUBLIC UNIVERSITY CORPORATION NAGOYA CITY UNIVERSITYInventors: Junpei Yamanaka, Akiko Toyotama, Tohru Okuzono, Satoshi Uda, Jun Nozawa
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Patent number: 9976228Abstract: [Problem] To provide a method for producing a colloidal crystal, wherein the method is easily controlled and is capable of dealing with a wide range of types of colloidal particle. [Solution] The method for producing a colloidal crystal in the present invention is characterized by comprising a preparation step of preparing a colloidal dispersion liquid, in which colloidal particles are dispersed in a liquid comprising an ionic surfactant and a colloidal crystal can be formed due to temperature changes, and a crystallization step of formation of a colloidal crystal by changing the temperature of the colloidal dispersion liquid from a temperature region in which the colloidal crystal is not formed to a temperature region in which the colloidal crystal is formed.Type: GrantFiled: March 3, 2012Date of Patent: May 22, 2018Assignees: PUBLIC UNIVERSITY CORPORATION NAGOYA CITY UNIVERSITY, FUJI CHEMICAL CO., LTD.Inventors: Junpei Yamanaka, Akiko Toyotama, Masaaki Yamamoto, Sachiko Onda, Tohru Okuzono, Fumio Uchida
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Publication number: 20170361297Abstract: [Object] Provided are a “eutectic colloidal crystal” which is an aggregate of plural kinds of colloidal crystals having different lattice constants, a solidified body of the eutectic colloidal crystal, and methods for producing them. [Resolution means] The eutectic colloidal crystal of the present invention contains two or more kinds of colloidal crystals composed of substantially monodispersed colloidal particles having different particle sizes. This eutectic colloidal crystal is obtained by providing a colloidal dispersion of two or more kinds of colloidal particles having different particle sizes, and a polymer which will not substantially adsorb to the colloidal particles (the coefficient of variation in particle size of these colloidal particles is less than 20%) dissolved in a dispersion medium (dispersion preparation process), and allowing the colloidal dispersion to stand (eutectoid process).Type: ApplicationFiled: December 2, 2015Publication date: December 21, 2017Applicant: PUBLIC UNIVERSITY CORPORATION NAGOYA CITY UNIVERSITYInventors: Junpei YAMANAKA, Akiko TOYOTAMA, Tohru OKUZONO, Satoshi UDA, Jun NOZAWA
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Patent number: 9023961Abstract: The present invention provides an acrylic resin composition containing a polycrystal of colloidal particles of silicon oxide in an acrylic resin that is formed by curing an acrylic monomer liquid at room temperature and/or an acrylic oligomer liquid at room temperature, wherein a mean distance between the colloidal particles in the polycrystal is 140 to 330 nm. The size of the single crystal that constitutes the polycrystal can be controlled by adjusting the content of silicon oxide and/or the additive amount of impurities. An architectural material, a fashion accessory, and an optical material are provided that are formed by using the acrylic resin composition.Type: GrantFiled: August 19, 2010Date of Patent: May 5, 2015Assignee: Fuji Chemical Company, LimitedInventors: Junpei Yamanaka, Akiko Toyotama, Fumio Uchida, Satoshi Kawanaka
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Patent number: 9017477Abstract: Provided is a process for producing colloidal crystals from which a large single crystal reduced in lattice defects and unevenness can be easily produced at low cost without fail. The process for colloidal crystal production comprises: preparing a colloidal polycrystal dispersion in which colloidal crystals precipitate at a given temperature (preparation step); introducing into a vessel The colloidal polycrystal dispersion in the state of containing fine colloidal polycrystals precipitated (introduction step); and melting the colloidal polycrystals and then recrystallizing the molten polycrystals (recrystallization step). The crystals thus obtained have fewer lattice defects and less unevenness than the original polycrystals.Type: GrantFiled: April 30, 2009Date of Patent: April 28, 2015Assignees: Nagoya City University, Fuji Chemical Co., Ltd.Inventors: Junpei Yamanaka, Mariko Shinohara, Akiko Toyotama, Koki Yoshizawa, Sachiko Onda, Masakatsu Yonese, Fumio Uchida
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Publication number: 20140069326Abstract: [Problem] To provide a method for producing a colloidal crystal, wherein the method is easily controlled and is capable of dealing with a wide range of types of colloidal particle. [Solution] The method for producing a colloidal crystal in the present invention is characterized by comprising a preparation step of preparing a colloidal dispersion liquid, in which colloidal particles are dispersed in a liquid comprising an ionic surfactant and a colloidal crystal can be formed due to temperature changes, and a crystallization step of formation of a colloidal crystal by changing the temperature of the colloidal dispersion liquid from a temperature region in which the colloidal crystal is not formed to a temperature region in which the colloidal crystal is formed.Type: ApplicationFiled: March 3, 2012Publication date: March 13, 2014Applicants: PUBLIC UNIVERSITY CORPORATION NAGOYA CITY UNIVERSITY, FUJI CHEMICAL CO., LTD.Inventors: Junpei Yamanaka, Akiko Toyotama, Masaaki Yamamoto, Sachiko Onda, Tohru Okuzono, Fumio Uchida
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Publication number: 20120142860Abstract: The present invention provides an acrylic resin composition containing a polycrystal of colloidal particles of silicon oxide in an acrylic resin that is formed by curing an acrylic monomer liquid at room temperature and/or an acrylic oligomer liquid at room temperature, wherein a mean distance between the colloidal particles in the polycrystal is 140 to 330 nm. The size of the single crystal that constitutes the polycrystal can be controlled by adjusting the content of silicon oxide and/or the additive amount of impurities. An architectural material, a fashion accessory, and an optical material are provided that are formed by using the acrylic resin composition.Type: ApplicationFiled: August 19, 2010Publication date: June 7, 2012Applicants: FUJI CHEMICAL CO., LTD., KYOCERA CORPORATIONInventors: Junpei Yamanaka, Akiko Toyotama, Fumio Uchida, Satoshi Kawanaka
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Publication number: 20110123803Abstract: Provided is a process for producing colloidal crystals from which a large single crystal reduced in lattice defects and unevenness can be easily produced at low cost without fail. The process for colloidal crystal production comprises: preparing a colloidal polycrystal dispersion in which colloidal crystals precipitate at a given temperature (preparation step); introducing into a vessel The colloidal polycrystal dispersion in the state of containing fine colloidal polycrystals precipitated (introduction step); and melting the colloidal polycrystals and then recrystallizing the molten polycrystals (recrystallization step). The crystals thus obtained have fewer lattice defects and less unevenness than the original polycrystals.Type: ApplicationFiled: April 30, 2009Publication date: May 26, 2011Applicants: NAGOYA CITY UNIVERSITY, FUJI CHEMICAL CO., LTD.Inventors: Junpei Yamanaka, Mariko Shinohara, Akiko Toyotama, Koki Yoshizawa, Sachiko Onda, Masakatsu Yonese, Fumio Uchida
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Patent number: 7772289Abstract: Prior colloidal crystal preparation means requires much workmanship to obtain colloidal crystals, relying much on the expertise of an operator. To utilize colloidal crystals in various fields and develop them from now on, it is in demand to establish preparation means capable of preparing colloidal crystals with good reproducibility. The object of the invention is to meet such demand. A gas compressed in a compressor (1) is controlled by a gas pulse controller (3) to generate compressed air pulses, and the pulses are then guided to a colloidal crystal preparation vessel (6) having a flat plate type capillary portion to produce a pressure fluctuation, which is in turn used as driving power, thereby giving a flow and hard-stopping motion to a colloidal solution in the flat plate type capillary for formation of colloidal crystals of good single crystallinity.Type: GrantFiled: July 21, 2004Date of Patent: August 10, 2010Assignee: National Institute for Materials ScienceInventors: Tsutomu Sawada, Toshimitsu Kanai, Akiko Toyotama
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Publication number: 20060183807Abstract: Prior colloidal crystal preparation means requires much workmanship to obtain colloidal crystals, relying much on the expertise of an operator. To utilize colloidal crystals in various fields and develop them from now on, it is in demand to establish preparation means capable of preparing colloidal crystals with good reproducibility. The object of the invention is to meet such demand. A gas compressed in a compressor (1) is controlled by a gas pulse controller (3) to generate compressed air pulses, and the pulses are then guided to a colloidal crystal preparation vessel (6) having a flat plate type capillary portion to produce a pressure fluctuation, which is in turn used as driving power, thereby giving a flow and hard-stopping motion to a colloidal solution in the flat plate type capillary for formation of colloidal crystals of good single crystallinity.Type: ApplicationFiled: July 21, 2004Publication date: August 17, 2006Inventors: Tsutomu Sawada, Toshimitsu Kanai, Akiko Toyotama
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Publication number: 20060144319Abstract: Gelled colloidal crystals obtained by ultraviolet irradiation gelation means proposed so far in the art are inadequate in term of homogeneous gelation as far as their deep portions, and gelled colloidal crystals obtained by use of gelation means relying upon a light source in the visible light range in place of that ultraviolet irradiation has several problems such as difficulty with selection of polymerization initiators and generation of gas bubbles. The object of the invention is to provide a colloidal crystal gelled homogeneously to within, from which those problems are eliminated. To this end, a colloidal solution using an aqueous liquid as a disperse medium with a monomer or macromer added thereto and camphorquinone, riboflavin or their derivative contained therein as a polymerization initiator is irradiated with light having a wavelength component in the range of at least 400 nm to 500 nm for the purpose of gelation, thereby providing a solution to the aforesaid problems.Type: ApplicationFiled: January 27, 2004Publication date: July 6, 2006Inventors: Tsutomu Sawada, Akiko Toyotama, Toshimitsu Kanai, Junpei Yamanaka, Kensaku Ito, Yoshihiro Takiguchi