DNA Dissolves Single-walled Carbon Nanotubes in Water

Nakashima, Naotoshi; Okuzono, Shingo; Murakami, Hiroto; Nakai, T.; Yoshikawa, Kunio

doi:10.1246/cl.2003.456

Cited by 268 publications

(184 citation statements)

References 18 publications

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“…In addition to surfactants, nanotubes can be stabilised in water by coating with other molecules, notably polymers [30,93] and biomolecules such as DNA [94][95][96][97][98] . SWNTs have been dispersed in water using both natural DNA [94][95][96] and short, custom-synthesised oligonucleotides [97,98] .…”

Section: Biomoleculesmentioning

confidence: 99%

See 1 more Smart Citation

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

600

536

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Many applications of carbon nanotubes require the exfoliation of the nanotubes to give individual tubes in the liquid phase. This requires the dispersion, exfoliation and stabilisation of nanotubes in a variety of liquids. In this paper we review recent work in this area, focusing on results from the author's group. We begin by reviewing stabilisation mechanisms before exploring research into the exfoliation of nanotubes in solvents, by using surfactants or biomolecules and by covalent attachment of molecules.The concentration dependence of the degree of exfoliation in each case will be highlighted. In addition we will discuss research into the dispersion mechanism for each dispersant type. Most importantly we have compared dispersion quality metrics for all dispersants. From this analysis, we conclude that functionalised nanotubes can be exfoliated to the greatest degree. Finally, we review the extension of this work to the liquid phase exfoliation of graphite to give graphene.

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Section: Biomoleculesmentioning

confidence: 99%

“…SWNTs have been dispersed in water using both natural DNA [94][95][96] and short, custom-synthesised oligonucleotides [97,98] . These dispersions have the advantage of using water as the solvent, which is very safe, readily available and necessary for any potential medical or biological applications.…”

Section: Biomoleculesmentioning

confidence: 99%

Liquid‐Phase Exfoliation of Nanotubes and Graphene

Coleman

2009

Adv Funct Materials

600

536

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“…Some types of amphiphilic polymers, such as DNA and block copolymers containing 2-methacryloyloxyethyl phosphorylcholine can efficiently disperse SWCNTs in solution media [15,16]. PVA also possesses amphiphilic properties as well as the ability to form fibers, and is one of the promising candidates for composite fibers with excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of high strength PVA/SWCNT composite fibers by gel spinning

Uddin

Aoki

et al. 2010

Carbon

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High-strength composite fibers were prepared from polyvinyl alcohol (PVA) (Degree of polymerization: 1500) reinforced by single-walled carbon nanotubes (SWCNTs) containing few defects. The SWCNTs were dispersed in a 10 wt.% PVA/dimethylsulfoxide solution using a mechanical homogenizer that reduced the size of SWCNT aggregations to smaller bundles. The macroscopically homogeneous dispersion was extruded into cold methanol to form fibers by gel spinning followed by a hot-drawing. The tensile strength of the well-oriented composite fibers with 0.3 wt.% SWCNTs was 2.2 GPa which is extremely high value among PVA composite fibers ever reported using a commercial grade PVA. The strength of neat PVA fibers prepared by the same procedure was 1.7 GPa. Structural analysis showed that the PVA component in the composite fibers possessed almost the same structure as that of neat PVA fibers.Hence a small amount of SWCNTs straightforward enhanced by 0.5 GPa the tensile strength of PVA fibers. The results of mechanical properties and Raman spectra for the SWCNT composites suggest the relatively good interfacial adhesion of the nanotubes and PVA that improves the load transfer from the polymer matrix to the reinforcing phase.-3 -

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“…However, the use of carbon nanotubes as gene delivery vectors requires functionalization to disperse the nanotubes in aqueous media and to render them able to effectively bind to DNA. It has been reported that a variety of single-stranded DNAs, short double-stranded DNAs, and RNAs can disperse SWCNTs [14,15], and that DNA is able to insert into the opened cavity of MWCNTs in a non-specific manner [16]. However, these methodologies would require high amounts of the purified genetic material in order to functionalize and use them as gene delivery systems.…”

Section: Introductionmentioning

confidence: 99%