RESUMO
Nano-sized gold particles dispersed in a composite were prepared by using NH2-terminated polyethyleneoxide (PEO-NH2) as a matrix. Gold was vapor-deposited onto a melt of PEO-NH2. Gold was smoothly dispersed into the interior of PEO-NH2 to form nano-sized gold particles. After cooling the melt to room temperature, a stable solid composite was obtained. The composite readily dissolved in water or various kinds of organic solvents to produce a stable colloidal solution. The mean size of the gold particles was 3.4 nm, and the content of gold was ca. 5 wt%. Copyright 1999 Academic Press.
RESUMO
A TiO2 surface was readily modified with nanosized gold particles prepared by the thermal relaxation technique. Adsorption of the gold particles was very rapid, and the adsorbed gold particles distributed independently. By the two-step calcination of the modified TiO2, the nanosized gold particles were immobilized on the TiO2 surface without size growth or coagulation. The supported gold particles showed low-temperature catalytic activity on CO oxidation. The preprepared nanosized gold particles interacted with TiO2. Copyright 1999 Academic Press.
