Studies on the surface interaction and dispersity of silver nanoparticles in organic solvents

Silver nanoparticles with different sizes have been prepared by microemulsi on and have been surface-modified with C12H25SH. Electron spin resonance re sults indicate that there exist some kinds of surface local paramagnetic si tes in capped Ag nanoparticles, which leads to the relation between electro n spin resonance parameters and particle size deviating from Kawabata's des cription. There is a strong interaction between nanosilver and chloroform. The smaller the particles, the stronger the interaction. Transmission elect ron microscopy and ultraviolet-visible absorption spectra confirmed that Ag nanoparticles are well dispersed in chloroform, implying that a good dispe rsity of Ag nanoparticles in polymers could be obtained by means of solutio n mixing by using chloroform as the solvent.