Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system | Teng et al. Nanoscale Research Letters 2011 6 293 http content 6 1 293 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Preparation and characterization of carbon nanofluid by a plasma arc nanoparticles synthesis system Tun-Ping Teng1 Ching-Min Cheng1 and Feng-Yi Pai2 Abstract Heat dissipation from electrical appliances is a significant issue with contemporary electrical devices. One factor in the improvement of heat dissipation is the heat transfer performance of the working fluid. In this study we used plasma arc technology to produce a nanofluid of carbon nanoparticles dispersed in distilled water. In a one-step synthesis carbon was simultaneously heated and vaporized in the chamber the carbon vapor and particles were then carried to a collector where cooling furnished the desired carbon water nanofluid. The particle size and shape were determined using the light-scattering size analyzer SEM and TEM. Crystal morphology was examined by XRD. Finally the characterization include thermal conductivity viscosity density and electric conductivity were evaluated by suitable instruments under different temperatures. The thermal conductivity of carbon water nanofluid increased by about 25 at 50 C compared to distilled water. The experimental results demonstrated excellent thermal conductivity and feasibility for manufacturing of carbon water nanofluids. Introduction As industrial and technological products demand higher standards of function and capacity the problem of heat dissipation from electrical appliances becomes a significant issue. To ameliorate this problem there are four approaches commonly taken 1 enlarge the heat exchanger area and structure 2 fabricate the heat exchanger using materials with higher thermal conductivity 3 increase the working fluid flow rate to the heat exchanger and 4 improve the heat transfer performance of the heat exchange working fluid. Of these methods enlargement of the heat .
