期刊
NANOTECHNOLOGY
卷 23, 期 21, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/21/215301
关键词
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资金
- Department of Energy (DOE) Office of Science
- DOE [DE-AC05-06OR23100]
- DARPA
We investigate the nanometer-scale flow of molten polyethylene from a heated atomic force microscope (AFM) cantilever tip during thermal dip-pen nanolithography (tDPN). Polymer nanostructures were written for cantilever tip temperatures and substrate temperatures controlled over the range 100-260 degrees C and while the tip was either moving with speed 0.5-2.0 mu m s(-1) or stationary and heated for 0.1-100 s. We find that polymer flow depends on surface capillary forces and not on shear between tip and substrate. The polymer mass flow rate is sensitive to the temperature-dependent polymer viscosity. The polymer flow is governed by thermal Marangoni forces and non-equilibrium wetting dynamics caused by a solidification front within the feature.
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