title: Quasi-elastic light scattering of platinum dendrimer-encapsulated nanoparticles.
abstract: Platinum dendrimer-encapsulated nanoparticles (DENs) containing an average 147 atoms were prepared within sixth-generation, hydroxyl-terminated poly(amidoamine) dendrimers (G6-OH). The hydrodynamic radii (R(h)) of the dendrimer/nanoparticle composites (DNCs) were determined by quasi-elastic light scattering (QLS) at high (pH ∼10) and neutral pH for various salt concentrations and identities. At high pH, the size of the DNC (R(h) ∼4 nm) is close to that of the empty dendrimer. At neutral pH, the size of the DNC approximately doubles (R(h) ∼8 nm) whereas that of the empty dendrimer remains unchanged. Changes in ionic strength also alter the size of the DNCs. The increase in size of the DNC is likely due to electrostatic interactions involving the metal nanoparticle.
authors.affiliation: Department of Chemistry and Biochemistry, Texas Materials Institute, Center for Nano and Molecular Science and Technology, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712, United States.
authors.forename: Christina H
authors.initials: CH
authors.lastname: Wales
authors.forename: Jacob
authors.initials: J
authors.lastname: Berger
authors.forename: Samuel
authors.initials: S
authors.lastname: Blass
authors.forename: Richard M
authors.initials: RM
authors.lastname: Crooks
authors.forename: Neer
authors.initials: N
authors.lastname: Asherie
mesh_terms: D050091:Dendrimers / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D012542:Scattering, Radiation
chemical_list: D050091:Dendrimers; D010984:Platinum