Fabrication of Nanocapsules by Liquid Phase Processes and Their Characteristics

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  • 液相プロセスによるナノカプセルの作製とその諸特性(ディスプレイ材料・製造技術シンポジウム)
  • 招待講演 液相プロセスによるナノカプセルの作製とその諸特性
  • ショウタイ コウエン エキソウ プロセス ニ ヨル ナノカプセル ノ サクセイ ト ソノ ショ トクセイ

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Abstract

This lecture introduces studies on fabrication of nanocapsules, i.e. core-shell particles with techniques based on a liquid phase process and their several properties, as follow. Nanocapsules composed of shells such as silica (SiO_2), titania (TiO_2) and polystyrene (PSt) have been produced previously. For coating with silica shell, Au, Ag, Co, AgI, CoPt, PtRu, Gd compound (GdC), fluorescence polystyrene microspheres and quantum dot (QD) were used as cores. SiO_2/GdC nanocapsules were also coated with SiO_2. For Au and Ag nanoparticles, optical spectra of the coated particles agreed with predictions by Mie theory. For metallic Co nanoparticles, crystallization of the Co was promoted with annealing in air with no oxidation of the Co, and the crystallized particles exerted magnetic properties. CoPt/SiO_2 nanocapsules also showed magnetic properties. PtRu/SiO_2 nanocapsules had catalytic activity stable for a long period. For Au, AgI, GdC and SiO_2/GdC, the silica-coated particle colloid solutions functioned as X-ray contrast agents. For GdC and SiO_2/GdC, the colloid solutions also functioned as MRI contrast agents. The fluorescence polystyrene microspheres/SiO_2 nanocapsules showed more stable fluorescence to laser-irradiation than uncoated microspheres. The QD/SiO_2 nanocapsule colloid solution could be used as a fluorescence marker for imaging tissues in a mouse. For coating with TiO_2 shell, SiO_2, PSt and SiO_2/PSt were used as cores. SiO_2/TiO_2 nanocapsules were used for fabrication of colloidal crystals. With the use of PSt/TiO_2 nanocapsules as precursor, hollow TiO_2 spheres could be fabricated by removing PSt core from the nanocapsules with annealing in air. Jingle bell-shaped hollow spheres were fabricated with removal of PSt from the multilayered nanocapsules composed of SiO_2 core, PSt inner shell, and TiO_2 outer shell by immersing them in tetrahydrofuran. For coating with PSt shell, Au/SiO_2 nanocapsules were used as cores, so that multilayered nanocapsules composed of Au core, silica inner shell and PS outer shell were successfully produced. This successful performance proved that it was possible to bond inorganic materials and organic materials.

Journal

  • ITE Technical Report

    ITE Technical Report 39.12 (0), 9-14, 2015

    The Institute of Image Information and Television Engineers

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