首页> 外文期刊>Journal of Sol-Gel Science and Technology >Low Cost Selective Solar Absorber Coatings: Characteristics of Carbon-In-Silica Synthesized with Sol-Gel Technique
【24h】

Low Cost Selective Solar Absorber Coatings: Characteristics of Carbon-In-Silica Synthesized with Sol-Gel Technique

机译:低成本的选择性太阳能吸收剂涂层:采用溶胶-凝胶技术合成的二氧化硅碳的特性

获取原文
获取原文并翻译 | 示例
获取外文期刊封面目录资料

摘要

Carbon-silica composite films have been fabricated using sol-gel synthesis of silica-carbon precursor composites,followed by carbonization in an inert atmosphere.Four categories of samples were studied.These were the tetraethyl orthosilicate-only (TEOS-only),methyl trimethoxysilane (MTES),acetic acid anhydride (Ac_2O) and soot (SOOT) samples.The carbon-silica films,spin-coated on aluminium and steel substrates,have been investigated for selective solar absorber functionality.Optical measurements were performed on these samples to determine solar absorptance and thermal emittance of each.The morphology of the films was studied by electron microscopy.Electron energy-loss spectroscopy (EELS) mapping was used to determine the carbon distribution.An optimum performance of 0.88 for solar absorptance and 0.41 for thermal emittance has been achieved.The sol-gel technique produced films with very flat surfaces and uniform thicknesses in the 1 mum range.The fine structure showed homogeneous mixing of the carbon and silica in the TEOS-only samples while the separate additions of MTES and Ac_2O resulted in segregation of composition of the silica and carbon at nano-scale.The addition of 20 wt% MTES or 15 wt% Ac_2O to the TEOS-only sols also helped to reduce the cracks in the TEOS-only samples.The addition of soot in place of the carbon precursor did not yield a net advantage.
机译:通过溶胶-凝胶合成二氧化硅-碳前驱体复合材料,然后在惰性气氛下碳化,制备了碳-二氧化硅复合膜。研究了四类样品,分别是仅四乙基原硅酸酯(仅TEOS),甲基三甲氧基硅烷(MTES),乙酸酐(Ac_2O)和烟灰(SOOT)样品。已对铝和钢基材上旋涂的碳-二氧化硅薄膜进行了选择性太阳能吸收器功能的研究,并对这些样品进行了光学测量以确定通过电子显微镜研究薄膜的形貌,使用电子能量损失谱(EELS)作图确定碳分布,其最佳吸收率是太阳吸收率0.88,热吸收率0.41。溶胶-凝胶技术生产的膜具有非常平坦的表面和均匀的厚度(在1 mum范围内)。精细的结构显示出均匀的混合仅TEOS样品中的碳和二氧化硅含量为ng,而单独添加MTES和Ac_2O则导致纳米级二氧化硅和碳的成分分离。向TEOS中添加20 wt%的MTES或15 wt%的Ac_2O纯溶胶也有助于减少纯TEOS样品中的裂纹。用烟灰代替碳前体并没有产生净优势。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号