A facile, efficient, and rapid covalent functionalization of multi-walled carbon nanotubes with natural amino acids under microwave irradiation

Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

“…It has been proved that the toxicity of CNTs can be reduced through chemical functionalization or by coating them with substances like polymers, hydroxyapatite or collagen [1, 2]_ENREF_1. In this way functionalized CNTs are soluble in many organic solvents because the hydrophobic nature of CNTs is turned into hydrophilic nature due to the attachment of polar groups [18]. The dispersion capacity of CNT is poor [19], but functionalization with oxidation promotes dispersion and at the same time surface activation is also achieved [20].…”

Preparation and characterization of starch nanocomposite embedded with functionalized MWCNT: Investigation of optical, morphological, thermal, and copper ions adsorption properties

“…Figure 3 displays the X-ray diffraction of unmodified and modified MWCNTs, pure starch and its related NCs. [29] This observation indicated that MWCNTs' crystalline structure did not change during surface modification. [29] This observation indicated that MWCNTs' crystalline structure did not change during surface modification.…”

“…Figure 4c and d represents Valinemodified MWCNTs with cylindrical-shaped structure and an average size of 62 nm in their diameters. [29] From these images, it could be inferred that Valine groups compactly functionalized MWCNTs' surface. Typical FE-SEM micrographs of pure starch and its NC 1 wt.% are exhibited in Figure 5a and b.…”

“…[29] At the first step, L-Valine (200 mg) and DMAc (20 ml) were mixed consequently stirred for 2 hr at 60°C. [29] At the first step, L-Valine (200 mg) and DMAc (20 ml) were mixed consequently stirred for 2 hr at 60°C.…”

“…TEM images not only display the shape and size of the Valine-modified MWCNTs but also show the spreading of them in the matrix. [29] TEM images of NC (Figure 6c-f) showed the efficient spreading of the Valine-modified MWCNTs in the starch; however, a slight aggregation between CNTs was observed. These structures were because of hydrogen bonding which formed between MWCNTs-Valine.…”