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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: The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system | Lv et al. Nanoscale Research Letters 2011 6 200 http www.nanoscalereslett.eom content 6 1 200 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system 1 2 2 1-1 Jizu Lv Minli Bai Wenzheng Cui Xiaojie Li Abstract Impact and friction model of nanofluid for molecular dynamics simulation was built which consists of two Cu plates and Cu-Ar nanofluid. The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid. The Lennard-Jones potential function was adopted to deal with the interactions between atoms. Thus motion states and interaction of nanoparticles at different time through impact and friction process could be obtained and friction mechanism of nanofluids could be analyzed. In the friction process nanoparticles showed motions of rotation and translation but effected by the interactions of nanoparticles the rotation of nanoparticles was trapped during the compression process. In this process agglomeration of nanoparticles was very apparent with the pressure increasing the phenomenon became more prominent. The reunited nanoparticles would provide supporting efforts for the whole channel and in the meantime reduced the contact between two friction surfaces therefore strengthened lubrication and decreased friction. In the condition of overlarge positive pressure the nanoparticles would be crashed and formed particles on atomic level and strayed in base liquid. Introduction The concept of nanofluids is first introduced by Choi 1 from Argonne National Laboratory in 1995 which means the stable suspension engineered by suspending nanoparticles of metal metallic oxide or non-metallic with average sizes below 100 nm in base fluid. For it has superior heat transfer characteristics and would make remarkable improvement for heat transfer capability of heat exchange .
