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

McLeod, Euan and Liu, Yu and Troian, Sandra M. (2011) Experimental Verification of the Formation Mechanism for Pillar Arrays in Nanofilms Subject to Large Thermal Gradients. Physical Review Letters, 106 (17). Art. No. 175501. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:20110525-083737887

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevLett.106.175501DOIArticle
http://prl.aps.org/abstract/PRL/v106/i17/e175501PublisherArticle
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.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSFCTS-0649474
NSFCBET 0701324
Classification Code:PACS: 81.16.Dn, 47.55.nb, 66.70.Hk, 68.35.bm
Record Number:CaltechAUTHORS:20110525-083737887
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110525-083737887
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23788
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Jun 2011 16:54
Last Modified:07 Jan 2017 07:39

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