Force measurements between sub-100 nm colloidal particles.
Interparticle forces have been measured between polystyrene latex particles as small as 85 nm in diameter in KCl solutions. A variant of the differential electrophoresis technique, called particle force light scattering (PFLS), was used to measure forces between Brownian, nearly touching particles for diameters from 4500 nm down to 85 nm. The forces, some less than 0.1 pN, matched to within a factor of 2 with predictions from depletion and DLVO theory.
Velegol
Darrell
D
Department of Chemical Engineering, The Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA. velegol@psu.edu
Holtzer
Gretchen L
GL
Radović-Moreno
Aleksandar F
AF
Cuppett
Joshua D
JD
D003102:Colloids / Q000737:chemistry*; D004586:Electrophoresis; D007840:Latex / Q000737:chemistry; D008027:Light; D053758:Nanoparticles / Q000737:chemistry*; D055585:Physical Phenomena; D010825:Physics; D012542:Scattering, Radiation
D003102:Colloids; D007840:Latex