Characterization of fullerene nanotubes prepared by the liquid–liquid interfacial precipitation method

Miyazawa, Kun’ichi; Minato, Junichi; Yoshii, Tetsuro; Suga, Tadatomo

doi:10.1016/j.stam.2005.03.018

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…Although it has been reported that C 70 crystals can be grown into 1D structures in specific solvent, ,, the work presented here is a remarkable demonstration that their morphology can be controlled from tube to cube in a single-type mixed solvent by simply varying the volume ratio of a good solvent to a poor solvent. To evaluate which solvent is more directly influencing the morphology control, we have identified the solvent cocrystallized with C 70 by GC–MS and TGA.…”

Section: Resultsmentioning

confidence: 85%

“…One includes monosolvent (good solvent) crystallization such as drop-drying, − SVA, , and evaporation, in which a reduced amount of solvent changes the local solubility and the fullerene molecules start to nucleate. The other method is bisolvent crystallization such as LLIP − and reprecipitation − that uses a decrease in solubility upon addition of poor solvent. In the latter case, the good solvent environment near fullerene molecules can be efficiently controlled by changing the amount of poor solvent while the amount of good solvent molecules is sufficient throughout the crystallization process in the monosolvent crystallization method.…”

Section: Resultsmentioning

confidence: 99%

“…Among various methods, solution-phase crystallization is a useful method because the crystallization environment can be controlled by adjusting diverse parameters. For crystallization of fullerene molecules, solution-phase crystallization methods include drop-drying, − solvent vapor annealing, , liquid–liquid interfacial precipitation (LLIP), − and reprecipitation. − All of these methods resemble conventional recrystallization methods that exploit abrupt changes in solubility at heterointerfaces. However, one important difference for fullerene crystallization is that the good solvent molecules interact closely with fullerene molecules by hydrophobic or charge-transfer interactions to distort the most thermodynamically stable self-organization pattern of fullerene.…”

Section: Introductionmentioning

confidence: 99%

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Selective Growth of a C₇₀ Crystal in a Mixed Solvent System: From Cube to Tube

2015

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Cube-and tube-shaped C 70 crystals were obtained selectively by reprecipitation using a combination of mesitylene (good solvent) and isopropyl alcohol (poor solvent). Both crystals include mesitylene molecules in their lattices; the ratios of C 70 to mesitylene were 1:2 in C 70 cubes and 1:0.7 in C 70 tubes. The volume ratio of mesitylene to IPA is a key parameter for the selective growth of C 70 cubes and C 70 tubes, rather than the supersaturation ratio, which governs crystal morphology in many other cases. Thus, we propose that the absolute amount of mesitylene near C 70 molecules determines the crystallization pathways for forming the C 70 •2(mesitylene) or C 70 • 0.7(mesitylene) phase, which finally result in C 70 cubes or C 70 tubes, respectively.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selective Growth of a C₇₀ Crystal in a Mixed Solvent System: From Cube to Tube

2015

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“…The diameter of the FNWs is around 100 nm and length is from several hundreds of nm to several mm. The diameter and length are controllable by changing the experimental conditions [ 16 , 17 ]. The relationships between the arrayed FNWs and cells have been investigated by Minami et al and Krishnan et al [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of amino acids by fullerenes and fullerene nanowhiskers

Hashizume

Hirata

Fujii

et al. 2015

Science and Technology of Advanced Materials

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We have investigated the adsorption of some amino acids and an oligopeptide by fullerene (C60) and fullerene nanowhiskers (FNWs). C60 and FNWs hardly adsorbed amino acids. Most of the amino acids used have a hydrophobic side chain. Ala and Val, with an alkyl chain, were not adsorbed by the C60 or FNWs. Trp, Phe and Pro, with a cyclic structure, were not adsorbed by them either. The aromatic group of C60 did not interact with the side chain. The carboxyl or amino group, with the frame structure of an amino acid, has a positive or negative charge in solution. It is likely that the C60 and FNWs would not prefer the charged carboxyl or amino group. Tri-Ala was adsorbed slightly by the C60 and FNWs. The carboxyl or amino group is not close to the center of the methyl group of Tri-Ala. One of the methyl groups in Tri-Ala would interact with the aromatic structure of the C60 and FNWs. We compared our results with the theoretical interaction of 20 bio-amino acids with C60. The theoretical simulations showed the bonding distance between C60 and an amino acid and the dissociation energy. The dissociation energy was shown to increase in the order, Val < Phe < Pro < Asp < Ala < Trp < Tyr < Arg < Leu. However, the simulation was not consistent with our experimental results. The adsorption of albumin (a protein) by C60 showed the effect on the side chains of Try and Trp. The structure of albumin was changed a little by C60. In our study Try and Tyr were hardly adsorbed by C60 and FNWs. These amino acids did not show a different adsorption behavior compared with other amino acids. The adsorptive behavior of mono-amino acids might be different from that of polypeptides.

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“…[1][2][3][4] Such structures, depending on their size and morphology, have a variety of applications including in photodetectors, sensors, solar cells, light emitting diodes and drug delivery. 2,5 In addition, chemically modified fullerene C 60 has application for controlled slow release of encapsulated drugs. 6 Recently, we established the use of the vortex fluidic device (VFD), Fig.…”

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confidence: 99%