Study of Si(Al)CN functionalized carbon nanotube composite as a high temperature thermal absorber coating material

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Show simple item record Asok, Deepu 2013-11-21T17:11:46Z 2013-11-21T17:11:46Z 2013-11-21
dc.description.abstract Carbon nanotubes (CNT) and polymer-derived ceramics (PDC) have gained considerable research attention due to their unique structure and physical properties. Carbon nanotubes are known for their exceptional mechanical (Young’s modulus= 1 TPa) and thermal properties (thermal conductivity = 4000 W/m.K). However, CNTs tend to lose their unique -sp2 carbon structure and cylindrical geometry at temperatures close 400°C in air. PDC, which are obtained by the controlled degradation of certain organosilicon polymers however exhibit high temperature stability (upto approx. 1400 °C). To this end, a hybrid composite material consisting of PDC functionalized CNT is of interest as it can combine the unique physical properties of the two materials for applications requiring operation under harsh conditions. Here, we report synthesis and chemical characterization of an Al-modified polysilazane polymer, which was later utilized to functionalize the outer surfaces of four commercially available CNTs. This polymer-CNT composite upon heating in nitrogen environment resulted in Si(Al)CN-CNT ceramic composite. The composite was characterized using a variety of spectroscopic methods such Raman, FTIR and electron microscopy. The thermal stability of the ceramic composite was studied by use of Thermogravimetric analysis (TGA) that showed an improvement in the thermal stability compared to bare nanotubes. Further, we also demonstrate that a stable dispersion of the composite in organic solvents such as toluene can be spray coated on a variety of substrates such as copper disks and foils. Such coatings have application in high energy laser power meters. This research opens new avenues for future applications of this novel material as coatings on surfaces that require both good thermal properties and protection against degradation in high temperature environments. We also suggest the future use of this material as an electrode material in high electrochemical capacity rechargeable batteries. en_US
dc.description.sponsorship National Science Foundation (Chemical, Bioengineering, Environmental, and Transport Systems Division) en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Polymer derived ceramics en_US
dc.subject Carbon nanotubes en_US
dc.subject Composite en_US
dc.subject Coating en_US
dc.title Study of Si(Al)CN functionalized carbon nanotube composite as a high temperature thermal absorber coating material en_US
dc.type Report en_US Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Mechanical & Nuclear Engineering en_US
dc.description.advisor Gurpreet Singh en_US
dc.subject.umi Materials Science (0794) en_US
dc.subject.umi Mechanical Engineering (0548) en_US
dc.subject.umi Nanoscience (0565) en_US
dc.subject.umi Nanotechnology (0652) en_US 2013 en_US December en_US

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