Ultrafine Ag8r particles formed in wlo microemulsions with different chain iength of aikanes were studied by UV-VIS spectrophotometry, stopped-fiow spectrophotometry and transmission electron microscopy.The ultraflne particies of Ag8r (5-7 nm in diameter) were obtained by mixing two separately prepared microemuision systems both containing AOT, n-hexane and an aqueous soiution of either AgN0 3 or Na8r. The size distribution of the near-Ly sphericai Ag8r particles broadened from S to about 10 nm as chain length of alkane was increased from n-hexane to n-octane. When n-dodecane or a higher alkane was used, the microemulsion system became increasingly unstable causing precipitation of Ag8r .

No abstract

No abstract