Thermal Analysis: Material Science Facilities for Undergraduate Teaching/Research in Chemistry and Physics

化学(12)本项目使用热分析仪器在化学和物理实验室中开发材料科学实验，并在这一领域进行本科生研究。在热分析方面，有三台辅助仪器(一台差示扫描量热仪(DSC)和一台具有析出气体分析功能的热重分析/差热分析(TGA/DTA)仪器，与一台专用的FTIR光谱仪配合使用)用于表征包括陶瓷和聚合物在内的固态材料。实验改编自教育和研究文献。在物理化学课程中，用仪器测量聚氨酯的热性能，测定蛋白质折叠的比热容和比热焓。在无机化学中，学生学习使用定义明确的Ru卡宾络合物的开环歧化聚合(ROMP)，并测量得到的聚合物的热性能。在一门高级物理实验课上，学生们用DSC研究YBa2Cu307-x超导体的正交-全四方相变，用TGA研究氧的化学计量。转变温度是该铜酸盐超导体中氧含量的敏感函数。第二个实验涉及对C60相变的研究。这些仪器用于化学系和物理系在材料科学方面的本科生研究。在化学中，热分析被用来评估用于通过热分解形成磁性半导体纳米颗粒的前体。水在多肽和蛋白质通过热分析吸附到矿物表面的作用也在研究中。在物理方面，富勒烯和水泥基材料的性能正在被研究。

Chemistry (12) This project uses thermal analysis instruments to develop materials science experiments in chemistry and physics laboratories as well as to conduct undergraduate research in this area. For thermal analysis, three complementary instruments (a Differential Scanning Calorimeter (DSC) and a Thermogravimetric Analysis/Differential Thermal Analysis (TGA/DTA) instrument, with Evolved Gas Analysis capabilities, coupled to a dedicated FTIR spectrometer) are used to characterize solid state materials including ceramics and polymers. Experiments are adapted from both the educational and the research literature. In the physical chemistry course the instruments are used to measure the thermal properties of polyurethane and to determine the specific heat capacity and enthalpy of protein folding. In inorganic chemistry, students study Ring Opening Metathesis Polymerization (ROMP) using a well-defined ruthenium carbene complex, and measure the thermal properties of the resulting polymer. In an upper level physics laboratory course, students study the orthorhombic-totetragonal phase transition in the superconductor YBa2CU307-x by DSC and oxygen stoichiometry by TGA. The transition temperature is a sensitive function of oxygen content in this cuprate superconductor. A second experiment involves the study of the phase transition of C60. The instruments are used in undergraduate research in materials science in both the chemistry and the physics departments. In chemistry, thermal analysis is used to evaluate precursors used to form nanoparticles of magnetic semiconductors by thermolysis. The role of water in the adsorption of peptides and proteins to mineral surfaces using thermal analysis is also being studied. In physics, the properties of fullerenes and cement based materials are being investigated.