title: Amorphous Se: a new platform for synthesizing superparamagnetic colloids with controllable surfaces.
abstract: We have successfully incorporated iron oxide nanoparticles into monodispersed amorphous selenium (a-Se) colloids by regulating the reaction temperature during the synthesis of a-Se. The surfaces of these a-Se colloids could be coated with conformal and smooth shells made of Pt and SiO2. The Se cores could then be removed by etching with hydrazine. The spherical morphology and superparamagnetism were maintained in all these synthetic steps. The presence of Pt and SiO2 on the outer surfaces of these colloidal particles allows one to control their surface functionalities through the formation of alkanethiolate and siloxane monolayers, respectively.
authors.affiliation: Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
authors.forename: Unyong
authors.initials: U
authors.lastname: Jeong
authors.forename: Thurston
authors.initials: T
authors.lastname: Herricks
authors.forename: Edan
authors.initials: E
authors.lastname: Shahar
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D003102:Colloids / Q000138:chemical synthesis* / Q000737:chemistry; D019855:Ethylene Glycol / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D007074:Immunoglobulin G / Q000737:chemistry; D008280:Magnetics; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D049329:Nanostructures / Q000737:chemistry*; D017671:Platinum Compounds / Q000737:chemistry; D012643:Selenium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013499:Surface Properties
chemical_list: D003102:Colloids; D005290:Ferric Compounds; D007074:Immunoglobulin G; D017671:Platinum Compounds; D013438:Sulfhydryl Compounds; C030173:platinum chloride; C000499:ferric oxide; D012822:Silicon Dioxide; D019855:Ethylene Glycol; D012643:Selenium