Controlling Cross Section of Carbon Nanotubes via Selective Hydrogenation

2010 ◽  
Vol 114 (27) ◽  
pp. 11753-11757 ◽  
Author(s):  
Guangfen Wu ◽  
Jinlan Wang ◽  
Xiao Cheng Zeng ◽  
Hong Hu ◽  
Feng Ding
Keyword(s):  
Carbon Nanotubes ◽  
Cross Section ◽  
Selective Hydrogenation

Carbon Nanotubes based composites for electromagnetic absorption- A review

2021 ◽  
Vol 01 ◽  
Author(s):  
Navdeep Singh ◽  
Gagan Deep Aul
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Cross Section ◽  
Radar Cross Section ◽  
Complex Permeability ◽  
Tangent Loss ◽  
Microwave Frequencies ◽  
Radar Absorbing Material ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

: Radar is a delicate detection device and since its evolution different techniques for reducing electromagnetic reflections have been discovered. This paper provide concise review on fundamentals of absorption which reduces radar cross section from stealth target with which radar cross section has effects to survivability and mission capability. The reduction of radar cross section depend on dielectric and magnetic properties of material. The first section reviews the Radar Absorbing Material (RAM) in order to provide a background on fundamentals, various stealth techniques for absorption and its properties at microwave frequencies. The second section reviews the Multi-Walled Carbon Nanotubes and its different composites by encapsulation of other metals, polymers or epoxies into it and its microwave absorption properties were studies at microwave frequencies. Multi-Walled Carbon Nanotubes based composites for microwave absorption are reviewed on the basis of various factors; material composition, reflection loss performance, thickness, complex permittivity, complex permeability, dielectric tangent loss, magnetic tangent loss, bandwidth, and frequency band.

Forced Convection in a Microchannel Heat Sink Using Carbon Nanotubes for Heat Transfer Enhancement

2004 ◽  
Author(s):  
Blake E. Jakaboski ◽  
Yogendra Joshi ◽  
Michael Rightley
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotubes ◽  
Cross Section ◽  
Heat Sink ◽  
Infrared Camera ◽  
Open Loop ◽  
Microchannel Heat Sink ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Multi Walled Carbon Nanotubes

A new type of microchannel heat sink has been developed and evaluated in this study. The device consists of silicon microchannels on whose bottom surfaces multi-walled carbon nanotubes are grown. The objective of the study is to investigate the effect of carbon nanotubes on the heat transfer characteristics. The heat sink size is 15 mm × 15 mm × 0.675 mm. It contains two microchannel designs. One consists of eight channels of cross section 682 μm × 50 μm; the other has six channels of cross section 942 μm × 50 μm. The heat sink is incorporated in an open loop flow facility, with water as the coolant. Six different configurations are compared. Two have no nanotubes, two have closely spaced nanotube, while the last two designs have widely spaced nanotubes. The tests utilize an infrared camera as well as thermocouples placed in the flow for characterization. The heat transfer characteristics are compared for the different cases.

Carbon Nanotubes Supported Mono- and Bimetallic Pt and Ru Catalysts for Selective Hydrogenation of Phenylacetylene

2012 ◽  
Vol 51 (13) ◽  
pp. 4934-4941 ◽  
Author(s):  
Chuang Li ◽  
Zhengfeng Shao ◽  
Min Pang ◽  
Christopher T. Williams ◽  
Xiongfu Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Selective Hydrogenation ◽  
Ru Catalysts
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