Interface chemistry can be implemented to modulate the aggregation and dispersion of nanoparticles in a colloidal
solution. In this experimental study, we demonstrate the controlled aggregation of superparamagnetic magnetite
nanoparticles in organic and aqueous solutions. With decrease in solution pH, individual nanoparticles (12-14 nm)
reproducibly cluster to form ~52 nm monodisperse aggregates in toluene. Spin-spin (T2) proton relaxation
measurements of the micellated clusters before and after aggregation show a change in the molar relaxation rate from
303 sec-1mol-1 to 368 sec-1mol-1 for individual and clustered nanoparticles, respectively. DNA-mediated aggregation of
micellated nanoparticles in the colloidal solution is also demonstrated where the number of single-stranded DNA per
particle determines the ultimate size of the nanoparticle aggregate.
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