Aravind S S Jyothirmayee, Ramaprabhu S
Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials Technology Center (NFMTC), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
J Nanosci Nanotechnol. 2012 Aug;12(8):6615-20. doi: 10.1166/jnn.2012.4540.
Nanoparticle fluid suspensions were prepared using photochemically functionalized multiwalled carbon nanotubes in polar base fluids. Multiwalled carbon nanotubes prepared by catalytic chemical vapour deposition technique have been functionalized by irradiating with ultraviolet light of wavelength 254 nm. The photochemical oxidation of multiwalled carbon nanotubes under UV irradiation introduces oxygen containing functional groups onto the surface of the nanotubes, generating new defects on their structure. Silver nanoparticles have been deposited over multiwalled carbon nanotubes by chemical method. The enhancement in thermal conductivity of the prepared nanofluids using functionalized multiwalled carbon nanotubes and Ag nanoparticles deposited functionalized multiwalled carbon nanotubes with volume fraction, temperature and aspect ratio has been demonstrated. Silver deposited functionalized multiwalled carbon nanotubes based nanofluids in DI water with 0.02% volume fraction exhibit a thermal conductivity enhancement of 9.9% and 47% at room temperature and at 50 degrees C respectively.
使用光化学功能化的多壁碳纳米管在极性基础流体中制备纳米颗粒流体悬浮液。通过催化化学气相沉积技术制备的多壁碳纳米管已通过用波长为254 nm的紫外光照射进行功能化。多壁碳纳米管在紫外光照射下的光化学氧化在纳米管表面引入了含氧官能团，在其结构上产生了新的缺陷。银纳米颗粒已通过化学方法沉积在多壁碳纳米管上。已经证明了使用功能化多壁碳纳米管和沉积有银纳米颗粒的功能化多壁碳纳米管制备的纳米流体的热导率随体积分数、温度和长径比的提高。体积分数为0.02%的去离子水中基于银沉积功能化多壁碳纳米管的纳米流体在室温下和50摄氏度时的热导率分别提高了9.9%和47%。
