Short carbon nanotubes produced by cryogenic crushing

Concentration and temperature controlled oxidation and cutting of single-walled carbon nanotubes by ammonium persulfate

“…Moreover, since Liu et al first converted nearly endless, highly tangled SWNT ropes into short, open-ended pipes by sonication in a mixture of concentrated acids [34], many methods have been developed to prepare short SWNTs. Physical methods, such as mechanical fragmentation [35][36][37][38][39][40][41][42], cryogenic crushing [43], e-beam [44], ion etching [45] and gamma radiations [46], can efficiently cut carbon nanotubes into short pipes. Dai's group developed a novel method of cutting and dispersing SWNTs through sonication with the help of special surfactants [47,48].…”

Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals

“…About 100 mg of the received MWCNT powder mixed with 50 ml of a 3:1 (v/v) mixture of concentrated H 2 SO 4 (98%) and HNO 3 (68%) were placed in a 100 ml glass bottle and sonicated in a conventional ultra-sonic bath. Temperature (25-40 o C) and sonication power of the bath (100 W, 40 kHz) were kept mild for 8 h duration to minimize tube damage [29,34]. The supernatant was decanted after centrifugating at 3000 rpm for 30 min and was filtered by 0.2 µm anodic alumina membrane (Whatmann).…”

“…It is therefore imperative to further understand the effect of reduction of van der Waals interaction between tubes by the field-induced stretching behaviour of CNT aggregates. Actually, a variety of modified CNTs through chemical and physical methods can be found in the literature [29][30][31][32][33][34]. Here, we use a common surface modification technique of chemical oxidative treatment for CNT covalent functionality [31].…”

P‐108: High Performances of the Powder Electroluminescence Device using the Carbon Nanotubes

“…For comparing the EL performance, the EL device without CNTs (refer to sample C) was also fabricated. All the SWCNTs used here were shortened by cryo-crushing method [6]. In the case of sample A, the SWCNTs was dispersed in dichlorobenzene and subsequently treated by ultra-sonication for 2 hours for the CNT solution.…”