NanoArt21 Exhibitions

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Home > NanoArt 2011 Exhibition > Siddhartha Pathak, USA, 2011
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CNT_Micropillar_SPathak 72dpi.jpg
Micro-pillar fabricated from a dense CNT brush-789 viewsHighly dense carbon nanotube (CNT) brushes, produced by high temperature vacuum decomposition of SiC single crystals, were fabricated to a 500nm diameter pillar using focused ion beam (FIB) micromachining with a Ga ion source, and imaged using a scanning electron microscope (SEM). Under in-situ micro-compression experiments, these dense CNT pillars exhibit significantly higher modulus (~150 GPa) and orders of magnitude higher resistance to buckling (~6 GPa) than vapor phase deposited CNT brushes or carbon walls. The ability of these dense CNTs to dissipate energy, while withstanding such elevated loads, is highly promising for energy-absorbing applications, especially in MEMS devices.
In-situ SEM fracture of CNT micro-pillars_SPathak 72dpi.jpg
In-situ fracture of a carbon nanotube micro-pillar-783 viewsThe scanning electron microscope (SEM) image shows a top-down view of a carbon-nanotube (CNT) micro-pillar after failure at ~1 GPa stress. These CNT micro-pillars were fabricated from highly dense CNT brushes, produced by high temperature vacuum decomposition of SiC single crystals, using focused ion beam (FIB) micromachining. Under in-situ micro-compression experiments, these dense CNT pillars are found to exhibit higher modulus and orders of magnitude higher resistance to buckling than CNT brushes produced using other methods. The ability of these dense CNTs to dissipate energy, while withstanding such elevated loads, is highly promising for energy-absorbing applications, especially in MEMS devices.
Plasticity in steel micro-pillars_SPathak_72dpi .jpg
Plasticity in steel micro-pillars -1021 viewsThe scanning electron microscope (SEM) image shows the plastic flow response of square (4 m 4 m) single crystal Fe-3%Si steel (BCC) micro-pillars oriented for single slip during in-situ SEM compression experiments. When the pillar edges are fabricated (using focused ion beam micromachining) parallel to the slip plane traces on the surface, easy glide along progressive single slip planes gives the distinctive bent shape to the pillars.
 
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