![]() For longer treatments, these struc- tu re s di sa pp ea r an d se em to be tr an sf or me d in to amorphous carbon (Fig. Multi- layered polyaromatic carbon structures can be observed after 8 h (Fig. Milling times progressively disrupt the SWNTs. How eve r, we sho w tha t SWN Ts, unl ike MWN Ts, do not resist indefi nite ly to the bal l-mi llin g tre atme nt bec aus e the for mati on of mul ti-l aye red pol yar oma tic car bon mat eria ls occ urs for longer times of treatment. In this paper, we report the use of ball milling with longer time of treatment to reduce the length of the single -walled carbon nanotubes (produced in thi s cas e by a cat aly tic che mica l vap or dep osi tion CCVD technique) and show that this process is effective to pro duc e sho rt nan otu bes. In this case, small times of tre atme nt are consid ere d (10 min) to sho w tha t bal l mill ing ind uce s dis ord er with in the bun dles and fra c- tures the nanotubes. The effect of ball milling on the structure and mor- pho logy of SWN Ts syn the siz ed by las er abl ati on has alr eady bee n stu die d to pro mote the ele ctr och emic al intercalation of lithium. ![]() Applying SWNTs, the possibility to cleave them using diamond powder has been reported but the technique is limited by the contamination by diamond particles. The results are the shortenin g of the nanotub es and the for mat ion of nan oba rre ls exh ibit ing an inc reas ed number of accessible active sites and anisotropic prop- erties at both ends. The ball milling effect on the morphology of cup-stacked carbon nanotubes have also been studied. The cleavage was caused by collision between one aga te bal l and the nan otu be pow der contai ned in an agate mortar. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |