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By A K Haghi

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Additional info for Foundations of Nanotechnology, Volume One: Pore Size in Carbon-Based Nano-Adsorbents

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Basic Concepts and an Overview 27 gelation with CTAB-containing CS solution (CSBN4). The adsorption capacities of composite for CR were in the order of: CSBN4 > CSBN1 > CSBN2 > CSBN3. The adsorption capacity of CSBN1 was slightly higher than CSBN2 for CR. This could be due to the dispersion in SDS molecules resulting in negatively charged CNTs as a result of adsorption of SDS molecules onto CNTs. The CR adsorption onto CSBN4 increased as the concentration of CNTs increased because of better dispersion of CNTs in SDS solution than in CTAB solution.

Prior to the application of the catalyst, the carbon fiber bundles were heat treated at 750°C for an hour in vacuum to remove the sizing. The growth temperature and time for CNTs deposition were selected as 750°C(T1000GB) and 700°C (K13D) for 900 s. 6 CNT-AC COMPOSITE Among various advanced functional materials, electronically conducting polymers (such as polypyrrole (PPy) and polyaniline (PANI)) and metal oxides (such as RuO2, MnO2, NiO, and Co3O4) are widely used in super-capacitors. However, their applications are severely limited by their poor solubility and mechanical brittleness.

The nanotube diameter depends on the catalyst particle size, therefore, the catalyst deposition technique, in particular the ability to control the particle size, is critical to develop nano devices. Porous silicon is an ideal substrate for growing self-oriented nanotubes on large surfaces. It has been proven that nanotubes grow at a higher ratio (length per minute), and they are better aligned than on plain silicon. The nanotubes grow parallel to each other and perpendicular to the substrate surface, because of catalyst surface interaction and the van der Waals forces developed between the tubes [56].

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