Method for separating double-walled carbon nanotubes of different diameters by using centrifugal speed changing method
A technology of double-walled carbon nanotubes and rate method, applied in the fields of carbon nanotubes, nanocarbons, chemical instruments and methods, etc.
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[0016] The present invention will be described in detail below in conjunction with accompanying drawing:
[0017] Polymer Synthesis
[0018] Argon was introduced into the 100ml polymerization bottle, and 2-amino-4,6-diiodopyrimidine (0.4160 mmol, 144.31 mg), 2,7-bis(4,4,5,5-tetramethyl -1,3,2-dioxaborolin-2-yl)-9,9-dioctylfluorene (0.4160mmol, 267.31 mg), cesium carbonate Cs2CO3 (2.08 mmol, 676.0 mg), plus 20.8 mL DME and 10.4 ml of deionized water, and argon gas was introduced for 15 min under electromagnetic stirring, and the zero-valent palladium catalyst Pd (PPh3) 4 (0.0208 mmol , 23.9 mg) was added. Under the protection of argon, the reaction system was refluxed at 58-60 ° C for 48 h, the reactant was cooled to room temperature, the resultant was washed successively with methanol and distilled water, recrystallized 3 times with chloroform / methanol, washed with methanol, and then dried under vacuum at 50°C for 48 h to obtain 138 mg of light yellow powder with a yield of 6...
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Abstract
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