Nanometer-scale flow of molten polyethylene from a heated atomic force microscope tip

被引：40

作者：

Felts, Jonathan R. ^{[1
]}

Somnath, Suhas ^{[1
]}

Ewoldt, Randy H. ^{[1
]}

King, William P. ^{[1
]}

机构：

[1] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA

来源：

NANOTECHNOLOGY | 2012年 / 23卷 / 21期

关键词：

DIP-PEN NANOLITHOGRAPHY; POLYMER; NANOSTRUCTURES; DEPOSITION; NANOWIRES;

D O I：

10.1088/0957-4484/23/21/215301

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页数：8

共 24 条

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