title: Magnetophoresis of nanoparticles.
abstract: Iron oxide cores of 35 nm are coated with gold nanoparticles so that individual particle motion can be tracked in real time through the plasmonic response using dark field optical microscopy. Although Brownian and viscous drag forces are pronounced for nanoparticles, we show that magnetic manipulation is possible using large magnetic field gradients. The trajectories are analyzed to separate contributions from the different types of forces. With field gradients up to 3000 T/m, forces as small as 1.5 fN are detected.
authors.affiliation: Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States. chjitkangl@eng.usm.my
authors.forename: Jitkang
authors.initials: J
authors.lastname: Lim
authors.forename: Caitlin
authors.initials: C
authors.lastname: Lanni
authors.forename: Eric R
authors.initials: ER
authors.lastname: Evarts
authors.forename: Frederick
authors.initials: F
authors.lastname: Lanni
authors.forename: Robert D
authors.initials: RD
authors.lastname: Tilton
authors.forename: Sara A
authors.initials: SA
authors.lastname: Majetich
mesh_terms: D002470:Cell Survival; D005290:Ferric Compounds / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D008280:Magnetics; D046210:Microfluidic Analytical Techniques; D008853:Microscopy; D057054:Molecular Imaging; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D011108:Polymers; D014867:Water; C000499:ferric oxide; D006046:Gold