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Authors Jia, Y. ; Zhao, B. ; Mehrizi, A.A. ; Wang, C. ; Xu, Y. ; Chen, L.
Title Identification of surface nanobubbles and resolving their size-dependent stiffness
Date 10.06.2020
Number 58628
Abstract 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.
Publisher Science China - Physics, Mechanics & Astronomy
Wikidata
Citation Science China - Physics, Mechanics & Astronomy 63 (2020) 294614
DOI https://doi.org/10.1007/S11433-020-1538-0
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