成果報告書詳細
管理番号20110000001133
タイトル*平成22年度中間年報 ナノテク・先端部材実用化研究開発/形状制御されたアルミナナノ粒子ゾルの実生産のための基盤技術の確立と用途開発
公開日2011/9/9
報告書年度2010 - 2010
委託先名独立行政法人産業技術総合研究所 川研ファインケミカル株式会社 学校法人日本大学
プロジェクト番号P05023
部署名電子・材料・ナノテクノロジー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 研究開発項目「(1)量産化技術の開発」≪川研ファインケミカル、産総研担当≫ 本研究開発項目では、実生産のためのスケールアップ技術ならびに長期保存安定化技術を確立する、とともに粒子形状制御の更なる精密化・精緻化技術の確立を目的とする。 (1)-1 ベンチスケール技術の開発≪川研ファインケミカル担当≫ 川研ファインケミカル株式会社は繊維状アルミナナノ粒子の製造技術をラボレベルで開発した。実生産に向けたベンチスケールでの生産技術の開発を目的として、22年度では30L以上へのスケールアップを目標とする。
英文要約Fibrous alumina sols with a high aspect ratio of ranging from 100 to 5000, which have been invented by us, can provide a porous, transparent alumina thin film by self-assembling. Since this novel alumina thin film has various specific features involving high heat resistance, high chemical stability, high heat transfer, ability for host materials, and so on, uses for various applications is expected. Objective of this study is the establishment of a basic technology for mass production and stable preservation in long term of the alumina sols and the development of new uses of the alumina sols.
For establishing a basic technology for mass production of the fibrous alumina sols, we performed the production of fibrous alumina sols using large scale reactor several times for confirming the reproducibility. From the results, we confirmed the reproducibility and established the bench-scale production of fibrous alumina sols. We found last year that dominion factors for solidification of alumina sols were the crystallinity and OH concentration on surface of alumina sols. So, we tuned temperature and acid concentration during hydrothermal treatment for changing the nature of alumina sols. We could successfully obtain the stable alumina sols which don’t solidify for 3 months and over. Moreover, we established the control of size and distribution of the fibrous and hexagonal plate alumina sols by optimizing both hydrolysis process and hydrothermal treatment.
We devoted the evaluation of fundamental properties and the application of alumina sols consisting of alumina nano-fibers with various aspect ratios. Application studies were focused on availability as a coating material to increase the thermal stability of gaskets, designing new functional materials (electro luminescence, a detector for transition metal ions, stabilizing for an enzyme and so on) based on self-standing alumina nano-fiber film. Followings are the subjects we developed in this year. (1) On the fundamental studies of the alumina sols, their thermal, electric, and coating properties are classified under their size, shape, and crystal structures. (2) In case of using the alumina sol as a filler to improve the thermal stability of the poly-vinyl alcohol, it became more stable at high temperature and thermal expansion was suppressed. (3) The alumina-sol coated graphite gasket has excellent properties. The sol can be well stuck on the gasket and is well coated with no pinholes or cracks to prevent gas leak. (4) Self-standing films had excellent adsorbing and coloring properties for Leuco dyes available for electro chromic displays. (5)The self-standing film includes nano-space between the fibers. By using this nano-space, lipase, which is a kind of enzyme, was well adsorbed. The amount of adsorbed enzyme was three times higher than commercially available porous silica adsorbent. (6) Terbium ion doped self-standing film displayed electro luminescence whose intensity was several cd/m^2. (7) By the heat treatment under high-pressure, we succeeded in the transformation of alumina sol (boehmite phase) into alpha-alumina nano-particles at 500 C which is 700 C lower than usual temperature of structural phase transition into alpha-alumina.
We established the novel hydrophilic treatment of alumina thin film by using NTP combined with hydrothermal treatment. We investigated the durability of the hydrophilic treated alumina thin film by a boiling water test. The contact angle of the hydrophilic treated alumina thin film maintained around 10 degree over 14 days.
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