Thermophysical properties of titania nanowires: novel characterization toward high-degree property and structure manipulation in manufacturing

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。二氧化钛和其他陶瓷纳米结构在各种传感、能量转换和生物医学器件中有着广泛的应用。在本研究中，将开发一种实验技术来测量陶瓷纳米线的重要热性能。研究合成纳米线的工艺参数与纳米线性能之间的关系。知识价值。陶瓷纳米线将采用溶胶-凝胶-静电纺丝技术制备。将开发一种激光辅助的非接触式方法来测量单个陶瓷纳米线的孔隙率、导热率和比热。具体来说，纳米线将使用调制激光源照射，并测量施加在纳米线上的极薄金属涂层的时变电阻率。纳米线的热响应将从电阻率信息中推断出来。通过热分析，可以确定纳米线的孔隙率、比热和导热系数。更广泛的影响。这项研究的结果将被整合到爱荷华州立大学现有的和新的课程中。ISU的PERUSE项目将为本科生参与暑期研究提供便利。包括对K12学生的拓展，并将包括监督来自当地高中的优秀学生的独立学习项目。

0931290WangThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Titanium dioxide and other ceramic nanostructures have broad application in various sensing, energy conversion, and biomedical device applications. In this research, an experimental technique will be developed to measure important thermal properties of ceramic nanowires. Relationships between the processing parameters used to synthesize the wires, and the nanowire properties will be developed. Intellectual Merit. Ceramic nanowires will be fabricated using a sol-gel-electrospinning technique. A laser-assisted, non-contact approach will be developed to measure the porosity, thermal conductivity and specific heat of single ceramic nanowires. Specifically, the nanowires will be irradiated using a modulated laser source, and the time-varying electrical resistivity of a very thin metallic coating applied to the nanowire will be measured. The thermal response of the nanowire will be inferred from the electrical resistivity information. Using a thermal analysis, the porosity, specific heat, and thermal conductivity of the nanowire will be determined. Broader Impacts. The results of the research will be integrated into existing and new courses at Iowa State University. Undergraduate participation in summer research will be facilitated through the PERUSE program at ISU. Outreach to K12 students is included, and will involve supervision of independent study projects by top students from local high schools.