Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published April 25, 2011 | Published + Supplemental Material
Journal Article Open

Experimental Verification of the Formation Mechanism for Pillar Arrays in Nanofilms Subject to Large Thermal Gradients


The free surface of molten nanofilms is known to undergo spontaneous formation of periodic protrusions when exposed to a large transverse thermal gradient. Early time measurements of the array pitch and growth rate in polymer melts confirm a formation process based on a long wavelength thermocapillary instability and not electrostatic attraction or acoustic phonon driven growth as previously believed. We find excellent agreement with theoretical predictions provided the nanofilm out-of-plane thermal conductivity is several times larger than bulk, an enhancement suggestive of polymer chain alignment.

Additional Information

© 2011 American Physical Society. Received 15 November 2010; published 25 April 2011. This study was funded by NSF grants CTS-0649474 and CBET 0701324.

Attached Files

Published - McLeod2011p13801Phys_Rev_Lett.pdf

Supplemental Material - README.TXT

Supplemental Material - SupplementaryMaterial_LY12285.pdf

Supplemental Material - Video_LY12285.avi


Files (9.3 MB)
Name Size Download all
8.5 MB Download
302.1 kB Preview Download
668 Bytes Preview Download
540.9 kB Preview Download

Additional details

August 19, 2023
October 23, 2023