Covalent molecular assembly in supercritical carbon dioxide: formation of nanoparticles in immobilized dendrimers within a porous silica gel matrix.
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).
Puniredd
Sreenivasa Reddy
SR
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore.
Nguan
Bellamy Chia Choon
BC
Srinivasan
M P
MP