Hydrolytic Unzipping of Boron Nitride Nanotubes in Nitric Acid

Kim, Dukeun; Muramatsu, Hiroyuki; Kim, Yoong Ahm

doi:10.1186/s11671-017-1877-3

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…The aqueous exfoliation and functionalization of h-BN sheets with hydroxyl groups was achieved through a hydrolysis reaction by prolonged-sonication of h-BN in aqueous media (Fig. 12b) [114], refluxing in concentrated strong acids or bases [115,116], solution-phase oxygen radical reaction [117], using urea with a ball milling process, using molten hydroxides [118], or direct hydrothermal reaction with hydrogen peroxide. The hydroxylated h-BN sheets can be diversely derivatized using a silylation reaction with various silane compounds [119,120].…”

Section: Surface Functionalization Of H-bnmentioning

confidence: 99%

2D-enabled membranes: materials and beyond

et al. 2019

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Membranes could reform the field of molecular separations by enabling new low energy manufacturing technologies. This review article discusses the current state of the art and the potential in the 2D-enabled membrane separation processes by highlighting emerging and existing areas in which robust 2D materials significantly impact the energy-efficient separation process. Analysis of 2D-enabled membrane classes and prospective materials for 2D-enabled membranes are also discussed with emphasis on the surface chemistry of basal plane engineered 2D materials.

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Section: Surface Functionalization Of H-bnmentioning

confidence: 99%

2D-enabled membranes: materials and beyond

et al. 2019

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“…Then, in the BNNTs dispersion, diazonium salt chloride was decomposed to generate anilinocarbocations, which was active in acid environment. Meanwhile, under this strong acid environment, the surface B-N bonds of BNNTs were fractured to generate more -B-OH and -NH groups [25,29]. Due to the high activity of anilinocarbocations, it could immediately capture the hydrogen atoms of -NH and -B-OH groups on the surface of BNNTs.…”

Section: The Functionalization Mechanismmentioning

confidence: 99%

Covalent Surface Functionalization of Boron Nitride Nanotubes Fabricated with Diazonium Salt

Liu

et al. 2018

Journal of Nanomaterials

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The chemical inertness and poor wetting properties of boron nitride nanotubes (BNNTs) hindered their applications. In this work, BNNTs have been functionalized with aniline groups by reacting with diazonium salt and the graft content of aniline component was calculated as high as 71.4 wt.%. The chemical structure, composition, and morphology of functionalized BNNTs were carefully characterized to illustrate the modification. The anilinocarbocation generated by decomposition of diazonium salt reacted not only with NH 2 sites, but also with B-OH sites on the surface of BNNTs. Meanwhile, the reaction applied a hot strong acid environment, which would help to open parts of B-N bonds to produce more reactive sites and enrich the functional groups grafted on the surface of BNNTs. Consequently, the functionalized BNNTs exhibited significantly improved dispersion stability in chloroform compared with pristine BNNTs. Amino surface functionalization of BNNTs offered more possibilities for surface chemical design of boron nitride and its practical application.

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“…The situation is even less clear concerning tube unzipping, for which there are no reports showing the existence of a high-pressure route. Nevertheless, it has been shown that sonication 27 or acid treatment 28 can be partially successful in BNNTs unzipping.…”

Section: ■ Introductionmentioning

confidence: 99%

High Pressure in Boron Nitride Nanotubes for Kirigami Nanoribbon Elaboration

et al. 2021

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Cutting and folding 2D systems is one of the explored paths to tune physical and chemical properties in atomic thick matter. Contrarily to graphene, boron nitride 1 (BN) nanoribbons are difficult to obtain and their folded structures have not been yet reported. Here we show that pressure application in multiwall boron nitride nanotubes leads to different types of tube internal organizations including BN nanoribbon formation and folds. The new observed tube-structures are associated to the breaking of a number of the internal tubes leading either to non-organized structures in the form of internal tube alveoli or in an organized stacking of folded h-BN nanoribbons. Irreversible changes in the morphology of multiwall BN nanotubes (MWBNNTs) take place from ∼7 GPa and morphologically modified tubes could be observed up to pressures of at least 49 GPa. The here used experimental probes included high resolution transmission microscopy, electron tomography and Raman spectroscopy. Atomistic modelling was also performed showing the formation of pinch structures along the tubes which favour pressure induced bond-breaking and hybridization changes and confirming the folded structure. Both experiments and modelling show that tube polygonization is a prominent characteristic of MWBNNTs even at ambient pressure. Overall, the pressure evolution of MWBNNTs strongly differs from their carbon analogues. The high mechanical stability of BN tube geometry is of interest for composite based structural materials. On the other side, the availability of h-BN nanoribbons and folded structures opens new prospects to produce physically modified BN properties.

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Hydrolytic Unzipping of Boron Nitride Nanotubes in Nitric Acid

Cited by 10 publications

References 21 publications

2D-enabled membranes: materials and beyond

2D-enabled membranes: materials and beyond

Covalent Surface Functionalization of Boron Nitride Nanotubes Fabricated with Diazonium Salt

High Pressure in Boron Nitride Nanotubes for Kirigami Nanoribbon Elaboration

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