title: A method to measure specific absorption rate of nanoparticles in colloidal suspension using different configurations of radio-frequency fields.
abstract: We report a method for characterization of the efficiency of radio-frequency (rf) heating of nanoparticles (NPs) suspended in an aqueous medium. Measurements were carried out for water suspended 5 nm superparamagnetic iron-oxide NPs with 30 nm dextran matrix for three different configurations of rf electric and magnetic fields. A 30 MHz high-Q resonator was designed to measure samples placed inside a parallel plate capacitor and solenoid coil with or without an rf electric field shield. All components of rf losses were analyzed and rf electric and magnetic field induced heating of NPs and the dispersion medium was determined and discussed.
authors.affiliation: Electrical and Computer Engineering Department, University of Houston, Houston, Texas 77204, USA ; Texas Center for Superconductivity, University of Houston, Houston, Texas 772042, USA.
authors.forename: Dhivya
authors.initials: D
authors.lastname: Ketharnath
authors.forename: Rohit
authors.initials: R
authors.lastname: Pande
authors.forename: Leiming
authors.initials: L
authors.lastname: Xie
authors.forename: Srimeenakshi
authors.initials: S
authors.lastname: Srinivasan
authors.forename: Biana
authors.initials: B
authors.lastname: Godin
authors.forename: Jarek
authors.initials: J
authors.lastname: Wosik