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Acid-treated MWCNT

Zhao et al. [104] reported the electrochemical behavior of myoglobin on MWCNT-GCE and the potential application for the development of a nitric oxide biosensor. Myoglobin was immobilized on the acid-treated-MWCNTs-GCE by dipping the electrode into 0.24 mM myoglobin solution (in acetate buffer pH 5.6) over 72 hours. After that, the electrode was removed, washed with water and stored at 4 °C. Electrochemical impedance spectroscopy experiments... [Pg.49]

Fig. 12.9 (a) FTIR spectra of as-received, air-oxidized, and acid-treated MWCNTs. The assigned functional groups are indicated, (b) HRTEM images of oxidized MWCNTs. The oxidation treatment results in the oxidation of the outer walls and introduces defective sites which are subsequently saturated with oxygen-containing functional groups thus Improving dispersion in polar solvents such as water (inset)... [Pg.314]

The electrode preparation, the enzyme immobilization procedure was described as follows. About two mg of acid treated MWCNTs was ultrasonicated in 1 pL of N, N dimethylformamide (DMF) until a black suspension was obtained. About 15 pi of this MWCNTs suspension was casted on the working area of SPE surface and dried in an oven at 80 °C for 30 min. About 10 pi of AChE solution (0.132 U) was dropped on the MWCNTs modified electrode surface and dried at room temperature under a current of air and used. Hydrodynamic voltammetric studies results shows that significant response was observed at MWCNT-SPE towards 2mM thiocholine, whereas the response was poor at the unmodified electrode (Fig. 2). The linear response of the MWCNT-SPE modified sensor was found to be between 5 pM - 430 pM (r2 = 0.999) with a sensitivity of 6.018 mA/M. In contrast, the response of AChE/SPE modified electrode was only 5 % and thus this result further reveals the contribution of MWCNTs in improving the sensitivity. [Pg.292]

PPS/PA66 60/40 Acid-treated MWCNT PA 66 phase At low content, CNTs are dispersed evenly in PA 66 phase and blend exhibits co-continuous structure. At high loading, the CNTs aggregate to give dispersed PA 66 phase Zou et al. 2006... [Pg.1533]

A stable and reusable CuO/carbon nanotube catalyst (CuO/MWCNT) for N-arylation of imdazole was developed by Karvembu et al. TEM images of the nanocatalyst showed good adhesion of CuO nanoparticles to anchoring sites of acid-treated MWCNTs. Even a small amount of the catalyst (0.98 mol%) was sufficient for the coupling reactions of imidazole and aryl halides. Additionally, a variety of the desired V-arylimidazoles were smoothly generated (11 examples, at 120°C for 24 h, 44%-96% yields) (Gopiraman et al., 2013). However, the application scope of the method is limited because only electron-poor aryl halides have been investigated. [Pg.113]

Premixing CNT with poly(ethylene terephthalate) (PET) in a solvent followed by melt spinning after drying the mixture Tensile strength of the composite fibers increased by 36.9% and the tensile modulus increased by 41.2% by adding 0.02 wt% of acid-treated MWCNTs Shen et al. [137]... [Pg.21]

Figure 2.4 SEM images of (a) acid-treated MWCNT and (b) the fracture surface of an MCWNT (0.1 wt%)-PMMA composite (scale bar = 1 micron). Figure 2.4 SEM images of (a) acid-treated MWCNT and (b) the fracture surface of an MCWNT (0.1 wt%)-PMMA composite (scale bar = 1 micron).
Carbon nanotubes (CNTs) and carbon nanofibers (CNFs) have a chemically inert surface and it is difficult to carry out surface modification. Acid treatment is usually used to introduce carboxylic groups at the defects of the CNT and CNF surface, which can improve particle dispersion. However, the acid treatment may damage the nanoparticles causing a reduction of mechanical properties. Park et al. prepared PMMA-MWCNT nanocomposites via suspension polymerization. Acid-treated MWCNTs were dispersed in MMA by ultrasonication, then an initiator (AIBN) was dissolved in the MMA-MWCNT mixture which was later poured into a solution with a stabilizer (PVA) to carry out polymerization at 95 °C for 3.5 h. After polymerization, the PS-MWCNT nanocomposite particles were collected by filtration. [Pg.154]

Chen et al. used a "grafting to" technique to synthesize PLLA-MWCNT nanocomposites (64). In this study, MWCNTs were first treated with acid to yield the carboxylic-acid-functionalized MWCNTs (MWCNT-COOH), which subsequently reacted with... [Pg.255]


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