TOP > 外国特許検索 > COLLOIDAL CRYSTALS HAVING DIAMOND LATTICE STRUCTURE AND METHOD FOR PRODUCING SAME

COLLOIDAL CRYSTALS HAVING DIAMOND LATTICE STRUCTURE AND METHOD FOR PRODUCING SAME

外国特許コード F210010476
整理番号 (S2019-0615-N0)
掲載日 2021年7月29日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2020JP037967
国際公開番号 WO 2021075323
国際出願日 令和2年10月7日(2020.10.7)
国際公開日 令和3年4月22日(2021.4.22)
優先権データ
  • 特願2019-188961 (2019.10.15) JP
発明の名称 (英語) COLLOIDAL CRYSTALS HAVING DIAMOND LATTICE STRUCTURE AND METHOD FOR PRODUCING SAME
発明の概要(英語) [Problem] To provide: (1) colloidal crystals that comprise colloidal particles with an average particle size of 50 nm or more and have a diamond lattice structure; and/or (2) a method whereby colloidal crystals having a diamond lattice structure can be easily produced.
[Solution] Colloidal crystals having a diamond lattice structure and comprising a first layer in which first particles are arranged so as to form the (111) plane of a face-centered cubic lattice structure, a second layer in which second particles are arranged in contact with the first particles on the first layer, and a third layer in which third particles are arranged in contact with the second particles on the second layer, wherein the first layer, the second layer and the third layer each have either a single layer structure or a multiple repetition structure.
従来技術、競合技術の概要(英語) BACKGROUND ART
"Colloid" refers to a state in which a dispersed phase is dispersed in a medium, and a state in which the medium is a liquid is referred to as a colloidal dispersion. In the present specification, the dispersed phase is directed to solid colloidal particles. When appropriate conditions are chosen, the colloidal particles assemble spontaneously in the colloidal dispersion and form various ordered structures called orderly arranged colloidal crystals.
The particle diameter of colloidal particles in colloidal crystals ranges from nanometer order to micrometer order, and the arrangement structure thereof also has a similar spatial period. Particles of approximately several 100 nm and arrays thereof scatter and diffract visible light, so research has been conducted in which colloidal crystals are applied as optical materials. In particular, it has been found that a diamond grating structure having a pitch of about the wavelength of light (see Fig.1) functions as a three-dimensional photonic crystal having a complete bandgap and capable of confining light (Non-Patent Document 1). Therefore, colloidal crystals have been actively studied in this field. In recent years, it has been reported that a complete bandgap is exhibited even in a disordered diamond lattice structure (amorphous diamond lattice structure) or a single-layer diamond lattice structure.
Known methods of manufacturing a diamond lattice structure include processing by electron beam lithography or precision drilling. However, with these physical processing methods, it is difficult to produce a thick three-dimensional diamond lattice structure. Therefore, attempts to produce a diamond lattice structure by self-assembly of colloidal particles have attracted attention worldwide.
However, when isotropic interactions work in a spherical particle colloid system of one component, the colloid crystals formed in a self-assembly manner have any one of a face-centered cubic lattice structure, a body-centered cubic lattice structure, and a hexagonal close-packed lattice structure (see Fig.2), and a diamond lattice structure cannot be obtained (Non-Patent Document 2). In addition, when the closest colloidal particles are in contact with each other, the spatial filling ratio of the particles is 74 % in the face-centered cubic lattice, whereas the spatial filling ratio of the particles having the diamond lattice structure is 34 %. Such a diamond lattice structure having a large number of voids is entropy disadvantageous and mechanically unstable (NpL 3).
On the other hand, it has been proposed to utilize electrostatic interaction to form a diamond lattice structure in a two-component colloidal system (NpL 4). Since electrostatic interactions work up to long distances, the use of electrostatic interactions can result in diamond lattice structures with large voids. It has been reported that large crystals (micron-sized) having a diamond-like lattice structure (ZnS type) are produced in a two-component system of positively and negatively charged metal nanoparticles of approximately 5 nm (Non-Patent Document 4). However, when the particle size of the colloidal particles is nanosized or greater, the attainment distance of the electrostatic interaction is relatively short compared to the particle size, and thus application of the present method becomes difficult (NpL 3). Therefore, a method for preparing colloidal crystals having a diamond lattice structure composed of colloidal particles having an average particle size of 50 nm or greater has not been known. In addition, colloidal crystals having a two-dimensional diamond lattice structure composed of only a single layer are not known.
Note that, as techniques related to the present invention, the present inventors report a method of producing two-dimensional crystals by adsorption of three-dimensional charged colloids (see Non-Patent Document 5) and research on conditions for generating tetrahedral clusters (Non-Patent Document 6).
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • NAGOYA CITY UNIVERSITY
  • MURATA MANUFACTURING CO., LTD.
  • 発明者(英語)
  • YAMANAKA Junpei
  • TOYOTAMA Akiko
  • OKUZONO Tohru
  • FUJITA Minori
  • AOYAMA Yurina
  • MINAMI Madoka
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS IT JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
ライセンスをご希望の方、特許の内容に興味を持たれた方は、問合せボタンを押してください。

PAGE TOP

close
close
close
close
close
close