000148753 001__ 148753
000148753 005__ 20181203021916.0
000148753 0247_ $$2doi$$a10.1039/b602145j
000148753 022__ $$a1463-9076
000148753 037__ $$aARTICLE
000148753 245__ $$aProbing the validity of the Derjaguin approximation for heterogeneous colloidal particles
000148753 269__ $$a2006
000148753 260__ $$bRoyal Society of Chemistry$$c2006
000148753 336__ $$aJournal Articles
000148753 520__ $$aThe Derjaguin approximation states that the interaction force between two curved surfaces is proportional to their effective radius, whereby the inverse effective radius is the arithmetic mean of the inverse curvature radii of the surfaces involved. The present study investigates the validity of this approximation with an atomic force microscope (AFM) by measuring interaction forces between colloidal particles of different sizes, but of identical composition. Forces were measured between silica particles of 2.0, 4.8 and 6.8 mu m in diameter in KCl electrolyte solution with and without adsorbed poly(amido amine) (PAMAM) dendrimers. The Derjaguin approximation could be confirmed at all distances investigated, including those comparable with the characteristic length scales of the surface roughness or the surface charge heterogeneities. For the conditions investigated, the Derjaguin approximation turns out to be surprisingly robust.
000148753 6531_ $$aDirect Force Measurements
000148753 6531_ $$aPoisson-Boltzmann Theory
000148753 6531_ $$aDouble-Layer Interaction
000148753 6531_ $$aAqueous-Electrolyte
000148753 6531_ $$aSurface Forces
000148753 6531_ $$aFlat-Plate
000148753 6531_ $$aPoly(Amidoamine) Dendrimers
000148753 6531_ $$aSilica Particles
000148753 6531_ $$aCharged Surfaces
000148753 6531_ $$aderjaguin approximation
000148753 6531_ $$acolloidal probe microscopy
000148753 700__ $$aRentsch, S.
000148753 700__ $$aPericet-Camara, R.
000148753 700__ $$aPapastavrou, G.
000148753 700__ $$aBorkovec, M.
000148753 773__ $$j8$$q2531-2538$$tPhysical Chemistry Chemical Physics
000148753 8564_ $$s991461$$uhttps://infoscience.epfl.ch/record/148753/files/Rentsch_PCCP_2006.pdf$$yPublisher's version$$zPublisher's version
000148753 909C0 $$0252447$$pIMT$$xU10343
000148753 909CO $$ooai:infoscience.tind.io:148753$$pSTI$$particle
000148753 917Z8 $$x198260
000148753 917Z8 $$x198260
000148753 917Z8 $$x148230
000148753 917Z8 $$x198260
000148753 937__ $$aEPFL-ARTICLE-148753
000148753 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000148753 980__ $$aARTICLE