tailieunhanh - Báo cáo hóa học: " Optimizing the design of nanostructures for improved thermal conduction within confined spaces"

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: Optimizing the design of nanostructures for improved thermal conduction within confined spaces | Kou et al. Nanoscale Research Letters 2011 6 422 http content 6 1 422 o Nanoscale Research Letters a SpringerOpen Journal NANO IDEA Open Access Optimizing the design of nanostructures for improved thermal conduction within confined spaces Jianlong Kou1 2 Huiguo Qian1 Hangjun Lu1 Yang Liu3 Yousheng Xu1 Fengmin Wu1 and Jintu Fan2 Abstract Maintaining constant temperature is of particular importance to the normal operation of electronic devices. Aiming at the question this paper proposes an optimum design of nanostructures made of high thermal conductive nanomaterials to provide outstanding heat dissipation from the confined interior possibly nanosized to the microspaces of electronic devices. The design incorporates a carbon nanocone for conducting heat from the interior to the exterior of a miniature electronic device with the optimum diameter D0 of the nanocone satisfying the relationship D02 x V x1 2 where x is the position along the length direction of the carbon nanocone. Branched structure made of single-walled carbon nanotubes CNTs are shown to be particularly suitable for the purpose. It was found that the total thermal resistance of a branched structure reaches a minimum when the diameter ratio b satisfies the relationship b y025bN-1 k where g is ratio of length b to approximately on the singlewalled CNTs b to approximately on the multiwalled CNTs k 2 and N is the bifurcation number N 2 3 4 . . The findings of this research provide a blueprint in designing miniaturized electronic devices with outstanding heat dissipation. PACS numbers . i . e Introduction With the miniaturization of electronic devices and the increased integration density the effective dissipation of heat becomes an important requirement for ensuring trouble-free operation 1 2 . The limited space available for heat dissipation the high energy densities and the dynamically changing and often unknown locations of heat sources