A highly improved method for purification of fullerenes applicable to large-scale production

Komatsu, Naoki; Ohe, Toshiyuki; Matsushige, Kazumi

doi:10.1016/j.carbon.2003.10.009

Cited by 26 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Any application, however, is limited in origin by tedious solidliquid extractions (usually in toluene) and time-expensive chromatographic separations [6][7][8][9][10][11][12][13][14][15] . More recently, the host-guest chemistry of molecular containers has been explored to encapsulate fullerenes 16 .…”

mentioning

confidence: 99%

Sponge-like molecular cage for purification of fullerenes

et al. 2014

View full text Add to dashboard Cite

Since fullerenes are available in macroscopic quantities from fullerene soot, large efforts have been geared toward designing efficient strategies to obtain highly pure fullerenes, which can be subsequently applied in multiple research fields. Here we present a supramolecular nanocage synthesized by metal-directed self-assembly, which encapsulates fullerenes of different sizes. Direct experimental evidence is provided for the 1:1 encapsulation of C 60 , C 70 , C 76 , C 78 and C 84 , and solid state structures for the host-guest adducts with C 60 and C 70 have been obtained using X-ray synchrotron radiation. Furthermore, we design a washingbased strategy to exclusively extract pure C 60 from a solid sample of cage charged with a mixture of fullerenes. These results showcase an attractive methodology to selectively extract C 60 from fullerene mixtures, providing a platform to design tuned cages for selective extraction of higher fullerenes. The solid-phase fullerene encapsulation and liberation represent a twist in host-guest chemistry for molecular nanocage structures.

show abstract

mentioning

confidence: 99%

Sponge-like molecular cage for purification of fullerenes

et al. 2014

View full text Add to dashboard Cite

show abstract

“…for the Filtration Process The various types of commercially available AC powders were found to exhibit different efficiencies in the separation process 11) , so we investigated both other types of AC powders, and fibrous and granular ACs. Powdered W-15, fibrous AC manufactured by Unitica Ad'all, provided too strong retention of C60 using tolu ene eluent but appropriate retention using chloro benzene 11) .…”

Section: Investigation Of Appropriate Ac and Solventmentioning

confidence: 99%

“…Powdered W-15, fibrous AC manufactured by Unitica Ad'all, provided too strong retention of C60 using tolu ene eluent but appropriate retention using chloro benzene 11) . Thorough investigation of the filtration conditions identified various solvents with larger fuller ene solubility applicable to this process 12) .…”

Section: Investigation Of Appropriate Ac and Solventmentioning

confidence: 99%

“…In the largest scale puri fication of 9.1 g of a fullerene mixture, a total ～ 4 l of TMB was passed through the AC layer of only 15 mm thickness on a 95 mm Kiriyama funnel TM over 40 min, giving 4.60 g (82％ yield) of pure C60 and 0.63 g (28％ yield) of C70 in 93％ purity. For obtaining pure C60, less than 1 l of TMB eluted over 10 min through pow dered AC fiber (54.6 g) was optimum (run 4), whereas 7 l of toluene eluted over 25 min was needed for the pu rification of the same amount of the fullerene mixture filtered through a layer of 80.0 g of AC powder 11) .…”

Section: Large-scale Separation Of C60 and C70mentioning

confidence: 99%

See 1 more Smart Citation

Novel and Practical Separation Processes for Fullerenes, Carbon Nanotubes and Nanodiamonds

直樹

2009

J. Jpn. Petrol. Inst.

Self Cite

View full text Add to dashboard Cite

Nanocarbons, defined as nanometer-sized carbon clusters including fullerenes, carbon nanotubes and nano diamonds, are one of the most fascinating materials known today. Applications for electronics and optics require controlled size and/or structure of these materials, because the physical properties are well known to closely cor relate with the structures. Therefore, separation methods of nanocarbons have been investigated, in particular practical processes applicable to large-scale separation. This review describes three novel and practical methods for separating fullerenes, carbon nanotubes and nanodiamonds, which have been developed in our group. In fullerene separation, a solution of fullerene mixture including C60, C70 and C＞70 was filtered through a thin layer of activated carbon to provide pure C60 and C70. Since this process is very useful, many patents were filed, and this technology was successfully transferred to a company. Circular single-walled carbon nanotubes were obtained in high purity by use of ultrasonic atomization. While this sonochemical process has been employed only for homogeneous systems such as concentration of aqueous ethanol, this is the first example to apply the sonoprocess to solid/liquid biphasic system. Separation of nanodiamond by centrifugation was effective to obtain single-digit nanometer size diamonds as small as 4 nm from nanodiamond powder with median size of 30 nm. This process was successfully applied to large-scale separation. Filtration, sonication and centrifuga tion are very fundamental experimental techniques which can be used for the separation of these three types of nanocarbons. Therefore, these processes are expected to be applied to the industrial scale production of nano carbons, which should reduce cost and increase availability.

show abstract

“…In a related and even more efficient method the purification was accomplished by filtration of a fullerene extract through a thin layer of activated carbon [203]. [198].…”

Section: Separation and Purificationmentioning

confidence: 99%

Parent Fullerenes

2004

Fullerenes

View full text Add to dashboard Cite

A highly improved method for purification of fullerenes applicable to large-scale production

Cited by 26 publications

References 22 publications

Sponge-like molecular cage for purification of fullerenes

Sponge-like molecular cage for purification of fullerenes

Novel and Practical Separation Processes for Fullerenes, Carbon Nanotubes and Nanodiamonds

Parent Fullerenes

Contact Info

Product

Resources

About