There are no files associated with this item.
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 10903 | - |
dc.citation.number | 20 | - |
dc.citation.startPage | 10896 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.citation.volume | 116 | - |
dc.contributor.author | Min, Chang-Ki | - |
dc.contributor.author | Chen, Kejia | - |
dc.contributor.author | Bae, Sung Chul | - |
dc.contributor.author | Cahill, David G. | - |
dc.contributor.author | Granick, Steve | - |
dc.date.accessioned | 2023-12-22T05:09:46Z | - |
dc.date.available | 2023-12-22T05:09:46Z | - |
dc.date.created | 2014-10-08 | - |
dc.date.issued | 2012-05 | - |
dc.description.abstract | We use time-resolved ellipsometry to investigate the rate of heat transfer at solid-gas interfaces through measurements of the amplitude and phase of acoustic waves at Brillouin frequencies, 100-400 MHz, at pressures 2 orders of magnitude higher than earlier comparable studies. An ultrafast optical pulse heats a thin metal film deposited on a sapphire substrate. Heat flow from the substrate into the gas causes expansion of the gas and generates an acoustic wave that is probed by off-null ellipsometry with subpicosecond time resolution. We compare the amplitudes and phases of photoacoustic signals generated in inert gases Ne, Ar, Kr, and Xe to a continuum theoretical model that includes the thermal accommodation coefficient ± at the gas-solid interface. For the surfaces we have studied, bare Au and Au coated by a self-assembled monolayer of 1-octadecanethiol (ODT), this comparison between experiment and theory for the amplitude of the photoacoustic waves suggests that ± values for bare and ODT-terminated Au are similar and ± > 0.3. This conclusion is tentative, however, because the phases of the photoacoustic waves show systematic differences that are not predicted by the model. For tetrafluoroethane vapor (R-134a refrigerant), the photoacoustic signal generated by a Au surface coated with a hydrophilic (COOH-terminated) self-assembled monolayer is a factor of 2 larger than the photoacoustic signal generated by a hydrophobic (CH 3-terminated) monolayer. We also report measurements of the ultrafast ellipsometry signals generated by the sudden desorption of physisorbed methanol and water on hydrophobic and hydrophilic self-assembled monolayers. | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.20, pp.10896 - 10903 | - |
dc.identifier.doi | 10.1021/jp302726u | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.scopusid | 2-s2.0-84861499943 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/7026 | - |
dc.identifier.url | https://pubs.acs.org/doi/10.1021/jp302726u | - |
dc.identifier.wosid | 000304338500009 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Heat Transfer at Solid-Gas Interfaces by Photoacoustics at Brillouin Frequencies | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Tel : 052-217-1404 / Email : scholarworks@unist.ac.kr
Copyright (c) 2023 by UNIST LIBRARY. All rights reserved.
ScholarWorks@UNIST was established as an OAK Project for the National Library of Korea.