Abstract
By controlling the intermolecular and surface forces of SDS in water, we show here that it is possible to engineer the resultant VdW attraction between SWNTs. Titrating SWNT-SDS dispersions with salt solutions leads to diameter-dependent modulation of the electrostatic repulsive forces; changes in the absorbance and emission spectra of SWNTs are used to study these effects. We ascribe the observed spectroscopic changes to selective aggregation of SWNT chiralities. Our experiments clearly demonstrate that certain SWNT chiralities deviate from a simple diameter-dependent
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