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dc.contributor.advisorThaulow, Christiannb_NO
dc.contributor.authorSandnes, Runarnb_NO
dc.date.accessioned2014-12-19T12:28:11Z
dc.date.available2014-12-19T12:28:11Z
dc.date.created2012-11-10nb_NO
dc.date.issued2012nb_NO
dc.identifier566954nb_NO
dc.identifierntnudaim:8132nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/241680
dc.description.abstractWith the prospect of producing superhydrophobic and mechanically stable biomimetic surfaces, the water repellent properties of springtail cuticles are investigated quantitatively. The analysis is based on apparent contact angle measurements on nine springtail species and SEM and AFM images of their cuticles. It is argued that water exists in a metastable Cassie-Baxter state on the cuticle and that three-phase line tension of the order of 10^-8 J/m contributes to high apparent contact angles. A model is developed to assess the significance of a recently reported re-entrant geometry of the cuticle granules and to study the resistance of the cuticle against wetting. The model estimates that springtails resist wetting under hydrostatic pressures up to 10^4 - 10^5 Pa, and that re-entrant granule profiles increase the wetting resistance by 50 - 400%. To explain the low contact angle hysteresis observed on the cuticles, new equations are proposed to include the effect of three-phase line tension. Again, a line tension magnitude of the order of 10^-8 J/m can account for the experimental findings. This work indicates that the sub-micron size scale of the springtail cuticle granules provides an elegant approach for achieving water repellent and mechanically stable surfaces. Two springtail species are singled out as especially promising for biomimetic applications.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for produktutvikling og materialernb_NO
dc.subjectntnudaim:8132no_NO
dc.subjectMTNANO Nanoteknologino_NO
dc.subjectNanoelektronikkno_NO
dc.titleWetting Properties of Springtail Cuticles: A Quantitative Analysisnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber89nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for produktutvikling og materialernb_NO


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