Surface-Functionalized Nanoparticles with Liquid-Like Behavior


  • We gratefully acknowledge the support by AFOSR, the Cornell Center for Materials Research (CCMR) and ONR. We thank Prof. B. Van Dover for magnetic measurements and Prof. George Fytas for many helpful discussions. Supporting Information is available online from Wiley InterScience, or from the author.


original image

Surface functionalization of silica or maghemite (γ-Fe2O3) nanoparticles with a quaternary ammonium organosilane leads to ionically modified nanoparticles that, depending on the nature of the counterion, exhibit liquid-like behavior in the absence of solvents. Solvent-free nanosalts composed of modified silica nanoparticles (Figure, left) can be used to dissolve and polymerize pyrrole, while nanosalts composed of maghemite nanoparticles (right) can form solvent-free ferrofluids.