S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Journal Papers (저널논문_기계항공공학부)
Capillarity-assisted fabrication of nanostructures using a less permeable mold for nanotribological applications
- Suh, Kahp Y.; Jeong, Hoon Eui; Kim, Deok-Ho; Singh, R. Arvind; Yoon, Eui-Sung
- Issue Date
- American Institute of Physics
- J. Appl. Phys. 100, 034303 (2006)
- FORCE LITHOGRAPHY; SOFT LITHOGRAPHY; STAMPS; MICROSTRUCTURES; POLY(DIMETHYLSILOXANE); POLYURETHANE; RESOLUTION; STABILITY; POLYMERS; SURFACES
- A simple kinetic model is presented to describe the capillary rise of a thin polymer film into a less permeable polyurethane acrylate mold. In this model, capillarity is explained by the competition between capillary and hydrodynamic forces in the course of pattern formation. For a less permeable mold, it was found that the capillary rise increases linearly with time. In addition, the contribution of viscosity and film thickness disappears such that the kinetics is solely governed by the permeation kinetics and capillary force. The present model would be useful to describe the evolution of molded nanostructures when a less permeable mold material other than polydimethylsiloxane is used for the patterning. Moreover, nanostructures with different tip shapes (rounded or dimpled) were observed depending on the fabrication temperature. The structures were tested for potential nanotribological applications such as reduction in adhesive and friction forces.