The dispersion effect of five cyclodextrins (CDs) on carbon nanotubes (CNTs) was studied. 2-HB-b-CD is the most efficient dispersing agent. The dispersing ability of CDs on the dispersion of CNTs was 2-The movement in the FTIR spectra of the asymmetric and symmetric stretching vibrations of O-H of the composites means hydrogen bonding was an important factor on the dispersing ability. These results indicate that the type of interaction might be a combination of a weak interaction similar to a van der Waals type and hydrogen bonding mechanism.
A new amphiphilic cyclodextrin derivative 2-O-(hydroxypropyl-N,N-dimethyl-N-dodecylammonio)-b-cyclodextrin (2-HPDMDA-b-CD) was prepared and characterized by surface tension, electrical conductivity, dynamic light scattering, transmission electron microscopy (TEM) and steady-state fluorescence. 2-HPDMDA-b-CD was found to be a fine surfactant with a smaller critical micelle concentration (1.21 mM) value than that of dodecyltrimethylammonium chloride. TEM showed that 2-HPDMDA-b-CD could form two kinds of spherical aggregates in solution. The smaller one showed little concentration dependence while the larger one showed relatively strong concentration dependence. 2-HPDMDA-b-CD could be a fine host compound in molecular recognition with two functional spaces of the cyclodextrin cavity and micelles.
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