title: Covalent molecular assembly in supercritical carbon dioxide: formation of nanoparticles in immobilized dendrimers within a porous silica gel matrix.
abstract: We report the formation of Pd, Pt and Pd/Pt nanoparticles in dendrimer-laden assemblies immobilized within a silica gel matrix and constructed by covalent layer-by-layer (LbL) assembly using supercritical carbon dioxide (SCCO(2)) as the processing medium. We show that the dendrimer plays a critical role in retaining the nanoparticle precursor within the silica gel. Smaller particle size, higher yield, a denser distribution of nanoparticles and greater stability were observed when the structures were assembled in SCCO(2).
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore.
authors.forename: Sreenivasa Reddy
authors.initials: SR
authors.lastname: Puniredd
authors.forename: Bellamy Chia Choon
authors.initials: BC
authors.lastname: Nguan
authors.forename: M P
authors.initials: MP
authors.lastname: Srinivasan