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Cited 20 time in webofscience Cited 20 time in scopus
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dc.contributor.authorJiwoo Hong-
dc.contributor.authorSeung Jun Lee-
dc.contributor.authorBonchull Chris Koo-
dc.contributor.authorYong Kwon Suh-
dc.contributor.authorKang, KH-
dc.date.accessioned2016-03-31T09:04:38Z-
dc.date.available2016-03-31T09:04:38Z-
dc.date.created2012-03-27-
dc.date.issued2012-04-17-
dc.identifier.issn0743-7463-
dc.identifier.other2012-OAK-0000025253-
dc.identifier.urihttps://oasis.postech.ac.kr/handle/2014.oak/16590-
dc.description.abstractWhen placed on an inclined solid plane, drops often stick to the solid surface due to pinning forces caused by contact angle hysteresis. When the drop size or the plane's incline angle is small, the drop is difficult to slide due to a decrease in gravitational force. Here we demonstrate that small drops (0.4-9 mu L) on a slightly inclined plane (similar to 12 degrees, Teflon and parylene-C surface) can be mobilized through patterned electrodes by applying low-frequency ac electrowetting under 400 Hz (110-180 V-rms), which has a mechanism different from that of the high-frequency ac method that induces sliding by reducing contact angle hysteresis. We attribute the sliding motion of our method to a combination of contact angle hysteresis and interfacial oscillation driven by ac electrowetting instead of the minimization of contact angle hysteresis at a high frequency. We investigated the effects of ac frequency on the sliding motion and terminal sliding of drops; the terminal sliding velocity is greatest at resonance frequency. Varying the electrowetting number (0.21-0.56) at a fixed frequency (40 Hz) for 5 mu L drops, we found an empirical relationship between the electrowetting number and the terminal sliding velocity. Using the relationship between the drop size and ac frequency, we can selectively slide drops of a specific size or merge two drops along an inclined plane. This simple method will help with constructing microfluidic platforms with sorting, merging, transporting, and mixing of drops without a programmable control of electrical signals. Also, this method has a potential in heat transfer applications because heat removal capacity can be enhanced significantly through drop oscillation.-
dc.description.statementofresponsibilityX-
dc.languageEnglish-
dc.publisherAMER CHEMICAL SOC-
dc.relation.isPartOfLANGMUIR-
dc.subjectCONTACT-ANGLE HYSTERESIS-
dc.subjectHEAT-TRANSFER-
dc.subjectLIQUID-DROPS-
dc.subjectHETEROGENEOUS SURFACES-
dc.subjectGRADIENT SURFACES-
dc.subjectMOTION-
dc.subjectACTUATION-
dc.subjectVIBRATION-
dc.subjectOSCILLATION-
dc.subjectDROPLETS-
dc.titleSize-selective sliding of sessile drops on a slightly inclined plane using low-frequency ac electrowetting-
dc.typeArticle-
dc.contributor.college기계공학과-
dc.identifier.doi10.1021/LA2039703-
dc.author.googleHong, J-
dc.author.googleLee, SJ-
dc.author.googleKoo, BC-
dc.author.googleSuh, YK-
dc.author.googleKang, KH-
dc.relation.volume28-
dc.relation.issue15-
dc.relation.startpage6307-
dc.relation.lastpage6312-
dc.contributor.id10107580-
dc.relation.journalLANGMUIR-
dc.relation.indexSCI급, SCOPUS 등재논문-
dc.relation.sciSCI-
dc.collections.nameJournal Papers-
dc.type.rimsART-
dc.identifier.bibliographicCitationLANGMUIR, v.28, no.15, pp.6307 - 6312-
dc.identifier.wosid000302852200014-
dc.date.tcdate2019-01-01-
dc.citation.endPage6312-
dc.citation.number15-
dc.citation.startPage6307-
dc.citation.titleLANGMUIR-
dc.citation.volume28-
dc.contributor.affiliatedAuthorKang, KH-
dc.identifier.scopusid2-s2.0-84859914978-
dc.description.journalClass1-
dc.description.journalClass1-
dc.description.wostc11-
dc.description.scptc10*
dc.date.scptcdate2018-05-121*
dc.type.docTypeArticle-
dc.subject.keywordPlusCONTACT-ANGLE HYSTERESIS-
dc.subject.keywordPlusHEAT-TRANSFER-
dc.subject.keywordPlusLIQUID-DROPS-
dc.subject.keywordPlusMOTION-
dc.subject.keywordPlusACTUATION-
dc.subject.keywordPlusSURFACES-
dc.subject.keywordPlusOSCILLATION-
dc.subject.keywordPlusDROPLETS-
dc.relation.journalWebOfScienceCategoryChemistry, Multidisciplinary-
dc.relation.journalWebOfScienceCategoryChemistry, Physical-
dc.relation.journalWebOfScienceCategoryMaterials Science, Multidisciplinary-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalResearchAreaChemistry-
dc.relation.journalResearchAreaMaterials Science-

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강관형KANG, KWAN HYOUNG
Dept of Mechanical Enginrg
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