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 thermocapilla...
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| Published in | Physical review letters Vol. 106; no. 17; p. 175501 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
29.04.2011
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| Online Access | Get more information |
| ISSN | 1079-7114 |
| DOI | 10.1103/PhysRevLett.106.175501 |
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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. |
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| AbstractList | 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. |
| Author | Troian, Sandra M McLeod, Euan Liu, Yu |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/21635044$$D View this record in MEDLINE/PubMed |
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| Title | Experimental verification of the formation mechanism for pillar arrays in nanofilms subject to large thermal gradients |
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