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Study on Dispersion and Application of Low Dimensional Nanomaterials in Aqueous Solution

Author: WangPingHua
Tutor: XiaoQi
School: Central South University
Course: Materials Science
Keywords: Carbon nanotubes Nano-zinc oxide Dispersion Polyaniline composites
CLC: TB383.1
Type: Master's thesis
Year: 2007
Downloads: 19
Quote: 0
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Abstract


The dispersion is the most important issue which must be resolved by the low-dimensional nanomaterials used in nanocomposites. In this thesis, two typical carbon nanotubes and nano-zinc oxide low-dimensional nanomaterials as cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) as a dispersant prepared high dispersion of carbon nanotubes and nano-zinc oxide suspension, while the CTAB and SDS adsorption model, the dispersion mechanism of carbon nanotubes and nano-zinc oxide, and to explore the carbon nanotubes and nano-zinc oxide dispersion of polyaniline composite conductivity and luminescent properties. The first use of the dye BPR and CTAB staining reaction to determine the concentration of CTAB - absorbance relationship A = 2619.3 × C the CTAB 0.1222; while taking advantage of the staining reaction of BPR and CTAB and SDS and CTAB salt precipitation reaction, identified by SDS concentration - absorbance relationship A = -3860.9 × C the SDS 2.3436. Based on the above relationship, the dye colorimetric method successfully for the determination of the amount of adsorption of CTAB and SDS in carbon nanotubes and nano-zinc oxide surface. CTAB and SDS in the carbon nanotube surface adsorption isotherm LS, and ultimately achieve monolayer saturation adsorption, and the adsorption state experienced a lying adsorption becomes standing adsorption process; carbon nanotube dispersion mechanism of static electricity - space steric interaction, which steric hindrance main; CTAB and SDS concentrations were 9.0 × 10 -4 mol · L -1 and 2.0 × 10 -3 mol · L -1 , carbon nanotubes suspended concentration of 78.3% and 60.5% of the initial concentration. CTAB and SDS ZnO surface adsorption isotherm as L-shaped, and ultimately achieve saturation adsorption of the bilayer; electrostatic dispersion mechanism of zinc oxide suspension - steric stabilization role electrostatic interaction; CTAB and SDS concentrations were 8.0 × 10 -4 the mol · the L -1 and 1.8 × 10 -3 mol · L -1 , nano-zinc oxide suspension concentration of 33.6% and 27.7% of the initial concentration. Dispersion of Carbon Nanotubes changes in carbon nanotube / polyaniline composite conductivity was decreased after increasing trend, carbon nanotubes achieve the best dispersion of carbon nanotubes / polyaniline composite conductivity. With the enhancement of the dispersion of nano-zinc oxide, zinc oxide / polyaniline composite materials will be strengthened in the lambda = 473nm the fluorescence peak intensity.

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