Solvent-free covalent functionalization of nanodiamond with amines

Solvent-free functionalization of carbon nanotube buckypaper with amines

“…additionally, the band at 719 cm -1 can be due to methyl rocking vibrations in octadecyl radicals. The functionalization targeted in the present study relies upon the temperature-activated formation of amide-type species between amines and carboxylic groups of oxidized nanocarbon [13,[15][16][17][18]. In this regard, one should note that the formation of amide bonds can be detected clearly for BP-ODA only, where C=O stretching ('amide I') absorption at 1650 cm -1 and NH bending ('amide II') band at 1553 cm -1 are evident.…”

“…The reason can be that larger, heavier, more agglomerated and rigid nanotubes were first to precipitate onto the filter, whereas the main bulk material was subsequently formed by smaller and M a n u s c r i p t 16 better dispersed MWCNTs-ox. In addition, when buckypaper is detached, its lower layer contacting the membrane can be partially damaged, since some nanotubes penetrated and stuck in the filter pores.…”

“…As a result, the whole CNT functionalization sequence exhibits similar features in terms of the use of a number of auxiliary steps such as acid refluxing, dispersion/redispersion with sonication, magnetic stirring, multiple centrifugation, decantation, filtering, washing and drying. In contrast, our research reports on the covalent chemistry of powder carbon nanomaterials (CNTs and nanodiamond) systematically addressed and emphasized the possibility of employing solvent-free gas-phase techniques for both covalent and noncovalent functionalization with organic compounds [12][13][14][15][16][17][18]. There are several obvious advantages of the solvent-free approach, in particular: (1) it does not produce abundant wastes of organic solvents, thus being more environmentally friendly; (2) it requires a minimalistic experimental setup, generally limited to a simple vacuum system and heating mantle; (3) the thermally-activated reactions (for example, amidation of carboxylic groups of CNTs and nanodiamond [13,[15][16][17][18]) are fast, and the functionalization completes in a few hours; (4) the excess of functionalizing reagent is spontaneously removed by heating under dynamic vacuum.…”

Direct surface PEGylation of nanodiamond via RAFT polymerization

“…[20][21][22][23] For example, Bastian J.M. Etzold et al demonstrated that the ND can be oxidized using aggressive experiment procedure to introduce oxygen-containing fuctional groups and decrease the size of ND, which applied the principle that the smaller, the more stability in ambient conditions.…”

Dual‐bonding structured ternary composite film of poly(vinyl alcohol)–boric acid–nanodiamond

“…Therefore, surface modification of DND is essential for better deagglomeration and compatibility in polymer matrix. So far, to actualize better dispersion and deagglomeration, some techniques such as thermal treatment, bead milling, and mechanical stirring and various functionalization reagents including chlorine, fluorine, amines, and mineral acids have been introduced to modify particle surface and enhance the interaction between particles and surfactants.…”