Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr13b1704x&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #MR13B-1704
Mathematics
Logic
3630 Experimental Mineralogy And Petrology, 3662 Meteorite Mineralogy And Petrology (1028, 6240), 3672 Planetary Mineralogy And Petrology (5410), 3944 Shock Wave Experiments, 6213 Dust
Scientific paper
Impact agglomeration has supposedly played a key role in the formation of planetesimals. Here we examine the agglomeration of nanoparticles as an extreme case, which is also interesting for developing physics- based scaling laws across nanometer to geological scales. The nanoparticles tend to coalesce spontaneously as driven by their high surface energy. However, the rate of agglomeration can greatly facilitated via impact. We conduct molecular dynamics simulations on two representative systems to illustrate this point: silica and Cu. Impact of silica and Cu nanoparticles is simulated in the binary and ternary systems as a function of impact velocity/angle and particle size. Our preliminary results show that agglomeration rate increases with the impact velocity, and varies with the impact angle. However, fragmentation occurs when the impact velocity exceeds a critical value. The morphology and structure of nanoparticles during impact are also characterized.
An Qingxiang
Fu Roger
Han Liang
Luo Shouyu
Ni Shuang
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