Authors
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Jia, Y. ; Zhao, B. ; Mehrizi, A.A. ; Wang, C. ; Xu, Y. ; Chen, L.
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Title
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Identification of surface nanobubbles and resolving their size-dependent stiffness
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Date
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10.06.2020
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Number
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58628
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Abstract
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We reporta comparativeinvestigationof the topographicfeaturesand nanomechanicalresponsesof surfacenanobubbles,polymericnanodrops,and solid microparticlessubmergedin waterand probedby atomicforcemicroscopyin differentoperatingmodes.We showthat thesemicroscopicobjectsexhibitsimilartopographies,eitherhemisphericalor hemiellipsoidal,in thestandardtappingmode,and thus are difficultto distinguish.However, distinctdifferences,causednot only by their differentmechanicalpropertiesbut also by differentcantilevertip-samplemechanicalinteractionsthat are affectedby tip wettability, wereobservedin successivetopographicimagingwith controlledscanningforcesand the nanoindentationtests,allowingfor theidentificationof surfacenanobubbles.Basedon the indentationforce-distancecurves,we furtherextrapolatedthe stiffness ofsurfacenanobubblesspanninga widerangeof sizesand then developeda simpletheoreticalmodelto explainthis sizedependence.We also demonstratehow size-dependentstiffness can be used to determinethe surfacetensionof nanobubbles,whichwas foundto be muchlowerthan the bulk valueof water.
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Publisher
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Science China - Physics, Mechanics & Astronomy
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Wikidata
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Citation
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Science China - Physics, Mechanics & Astronomy 63 (2020) 294614
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DOI
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https://doi.org/10.1007/S11433-020-1538-0
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Tags
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