成果報告書詳細
管理番号20150000000686
タイトル*平成26年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (風力発電その他未利用エネルギー) カーボンナノチューブを用いた高効率太陽熱吸収体の開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名ナノフロンティアテクノロジー株式会社 国立大学法人信州大学
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title : New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (Wind Power Generation And Other Untapped Energies) / Research and Development of efficient Solar Collector using carbon nanotubes (FY2014-FY2015)FY2014 Annual Report

1. Improvement in a sunlight absorption ratio of a solar collector We changed titanium oxide materials (TiO2) into new TiO2 from what was being used before. As a result, the reproducibility of composite improved as synthesis of TiO2 is influenced by neither temperature nor humidity.Also the surfactant of carbon nanotubes (CNT) dispersion was changed. CNT dispersion came to be stabilized in the long term and succeeded to create more pores on the CNT-TiO2 composite. As a result, light absorption ratio (400-800nm) was improved rather than before. We are considering lamination of composite since there is issue in intensity. 2. Development of base layer of solar collector Base layer was developed using the TiO2 and the carbon black. Although adherence with a substrate and CNT-TiO2 composite layer were satisfactory, cracks were observed by SEM analysis. The crack decreased by mixing some TiO2 materials with which composition is different. Further improvement is due to be held, since there may have a problem in durability. Moreover, we started development of material of base layer with Shinshu University.By creating a CNT-TiO2 composite on a base layer, we succeeded in reducing the amount of CNT using. Light absorption property has the same as before. 3. Development of top coat material Coatings over the CNT-TiO2 composite were developed. By using the catalytic sol-gel process developed in Shinshu University, an adhesive silica polymer was prepared. In order to thicken the coatings, particles were added to the silica polymer.The polymerization degree of silica, the ratio of particle to silica polymer, and the particle size were optimized. Both sunlight absorption property and intensity is incomplete. 4. Development of 3 layers structure (base layer, CNT-TiO2 layer and top coat layer) Using the developed material1, 2 and 3 were laminated on the substrate. 98-99% of light absorption ratio (250-2500nm) and 0.8-0.9 of thermal emissivity (2-25μm) were achieved. 5. Analysis of the mechanism of light absorption and thermal radiation The mechanism of heat absorption was studied. Generally on the flat surface, the light absorption is equal to the heat radiation. For the CNT-TiO2 composite in this study, the light absorption was larger than the heat radiation. This result was due to the nanotextured structure. CNT with a high thermal conductivity played a role on the heat transfer from the composite to the substrate.
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