293 0

Full metadata record

DC FieldValueLanguage
dc.contributor.author장경영-
dc.date.accessioned2017-11-02T06:42:31Z-
dc.date.available2017-11-02T06:42:31Z-
dc.date.issued2016-01-
dc.identifier.citationSOFT MATTER, v. 12, NO 3, Page. 859-866en_US
dc.identifier.issn1744-683X-
dc.identifier.issn1744-6848-
dc.identifier.urihttp://pubs.rsc.org/en/Content/ArticleLanding/2016/SM/C5SM01649E#!divAbstract-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/30448-
dc.description.abstractSurface modification is a promising method to solve the tribological problems in microsystems. To modify the surface, we fabricated hierarchical patterns with different pitches of nano-scale features and different surface chemistries. Micro-and nano-patterns with similar geometrical configurations were also fabricated for comparison. The nano-tribological behavior of the patterns was investigated using an atomic force microscope at different relative humidity levels (5% to 80%) and applied normal loads (40 nN to 120 nN) under a constant sliding velocity. The results showed significant enhancement in the de-wetting and tribological performance of the hierarchical patterns compared with those of flat and micro-and nano-patterned surfaces. The PTFE-coated hierarchical patterns showed similar dynamic contact angles (advancing and receding) to those of the real lotus leaf. The influence of relative humidity on adhesion and friction behavior was found to be significant for all the tested surfaces. The tribological performance was improved as the pitch of the nano-scale geometry of the hierarchical pattern increased, even though the wetting property was not influenced significantly. A model was proposed based on the role of intermolecular force to explain the effect of the pitch of the hierarchical patterns on the adhesion and friction behavior. According to the model based on the molecular force, the contact between a ball and the patterned surface was a multi-asperity contact, contrary to the single-asperity contact predicted by the Johnson-Kendall-Roberts (JKR) and Maugis-Dugdale (MD) models. The strong intermolecular forces, which are activated in the confined spaces between the adjacent nano-pillars and the ball, contributed to the contact area and hence the adhesion and friction forces.en_US
dc.description.sponsorshipThis research was supported by the KIST Institutional Program (2E25590 and 2E25474) and the Original Technology Research Program for Brain Science through the National Research Foundation of Korea (NRF), which is funded by the Ministry of Education, Science, and Technology (NRF-2012M3C7A1055410).en_US
dc.language.isoenen_US
dc.publisherROYAL SOC CHEMISTRYen_US
dc.subjectCONTACT AREAen_US
dc.subjectSURFACESen_US
dc.subjectFRICTIONen_US
dc.subjectADHESIONen_US
dc.subjectTRIBOLOGYen_US
dc.subjectSPHERESen_US
dc.subjectDEVICESen_US
dc.subjectFORCESen_US
dc.subjectGECKOen_US
dc.subjectMICROen_US
dc.titleNanotribological and wetting performance of hierarchical patternsen_US
dc.typeArticleen_US
dc.relation.no3-
dc.relation.volume12-
dc.identifier.doi10.1039/c5sm01649e-
dc.relation.page859-866-
dc.relation.journalSOFT MATTER-
dc.contributor.googleauthorGrewal, H. S.-
dc.contributor.googleauthorPiao, Shuxue-
dc.contributor.googleauthorCho, Il-Joo-
dc.contributor.googleauthorJhang, Kyung-Young-
dc.contributor.googleauthorYoon, Eui-Sung-
dc.relation.code2016001156-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDIVISION OF MECHANICAL ENGINEERING-
dc.identifier.pidkyjhang-
dc.identifier.orcidhttp://orcid.org/0000-0001-5168-2361-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE