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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Platinum nanoparticles ： ウィキペディア英語版 Platinum nanoparticles Platinum nanoparticles are usually in the form of a suspension or colloid〔(Conductive Polymer / Solvent Systems: Solutions or Dispersions? ), Bernhard Wessling, 1996〕 of submicrometre-size particles of platinum in a fluid, usually water. A colloid is technically defined as a stable dispersion of particles in a fluid medium (liquid or gas). Platinum nanoparticles can be made with sizes between about 2 and 20 nanometres (nm), depending on reaction conditions. Trillions of platinum nanoparticles are suspended in the colloidal solution of brownish-red or black color. Nanoparticles come in wide variety of shapes including spheres, rods, cubes, and tetrahedra.〔TS Ahmadi, ZL Wang, TC Green, A Henglein and MA El-Sayed (1996) Shape controlled synthesis of colloidal platinum nanoparticles. Science 272, 1924-1926.〕 Due to the antioxidant properties of the platinum nanoparticles, they are the subject of substantial research, with potential applications in a wide variety of areas, including nanotechnology, catalysis, medicine, and the synthesis of novel materials with unique properties. == Synthesis == Platinum nanoparticles〔(Creation of platinum nanoparticles ) (pdf)〕 are made by reduction of hexachloroplatinate. A solution is rapidly stirred while a reducing agent such as hydrogen gas is added, causing platinum ions to be reduced to neutral platinum atoms. As more and more of these platinum atoms form, the solution quickly becomes supersaturated and platinum starts to precipitate in the form of sub-nanometre particles. As the reaction proceeds, platinum atoms are added to these nuclei, which grow in size. If the solution is stirred vigorously enough, the particles will be fairly uniform in size and shape. To prevent the particles from aggregating, some sort of stabilizing agent or stabilizer that sticks to the nanoparticle surface is usually added, such as sodium polyacrylate. They can be functionalized with various organic ligands to create organic-inorganic hybrid materials with advanced functionality. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Platinum nanoparticles」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.