Supercritical fluid processing: a rapid, one-pot exfoliation process for the production of surfactant-free hexagonal boron nitride nanosheets

Thangasamy, Pitchai; Sathish, M.

doi:10.1039/c5ce00926j

Cited by 81 publications

(62 citation statements)

References 39 publications

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“…As an alternative, supercritical alcohols such as scEtOH (supercritical ethanol), [63,133,135,148] scACN (supercritical acetonitrile), [138] and a mixture of scIPA (supercritical isopropanol) [54] or scEtOH [148] and water have been studied. As an alternative, supercritical alcohols such as scEtOH (supercritical ethanol), [63,133,135,148] scACN (supercritical acetonitrile), [138] and a mixture of scIPA (supercritical isopropanol) [54] or scEtOH [148] and water have been studied.…”

Section: Low-boiling (Mixed) Solventsmentioning

confidence: 99%

Supercritical Fluid‐Facilitated Exfoliation and Processing of 2D Materials

et al. 2019

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Since the first intercalation of layered silicates by using supercritical CO2 as a processing medium, considerable efforts have been dedicated to intercalating and exfoliating layered two‐dimensional (2D) materials in various supercritical fluids (SCFs) to yield single‐ and few‐layer nanosheets. Here, recent work in this area is highlighted. Motivating factors for enhancing exfoliation efficiency and product quality in SCFs, mechanisms for exfoliation and dispersion in SCFs, as well as general metrics applied to assess quality and processability of exfoliated 2D materials are critically discussed. Further, advances in formation and application of 2D material–based composites with assistance from SCFs are presented. These discussions address chemical transformations accompanying SCF processing such as doping, covalent surface modification, and heterostructure formation. Promising features, challenges, and routes to expanding SCF processing techniques are described.

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Section: Low-boiling (Mixed) Solventsmentioning

confidence: 99%

Supercritical Fluid‐Facilitated Exfoliation and Processing of 2D Materials

et al. 2019

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“…Thangasamy et al . reported a simple, one‐pot, fast, and interesting supercritical fluid mixture of isopropanol and water to produce few‐layered BNNS 60. Typically, pristine h‐BN was mixed by sonication with isopropanol‐water solution and was then sealed in a stainless‐steel vessel.…”

Section: Fabrication Of Bnnss By Exfoliationmentioning

confidence: 99%

“…In this process, the solvent quickly diminished, obtaining the gas‐like diffusion and liquid‐like solvent properties at the same time. The method was found to yield as much as 10% few‐layered BNNSs in the supernatant 60…”

Section: Fabrication Of Bnnss By Exfoliationmentioning

confidence: 99%

Fabrication of Boron Nitride Nanosheets by Exfoliation

Wang

Tang

Xue

et al. 2016

The Chemical Record

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Nanomaterials with layered structures, with their intriguing properties, are of great research interest nowadays. As one of the primary two-dimensional nanomaterials, the hexagonal boron nitride nanosheet (BNNS, also called white graphene), which is an analogue of graphene, possesses various attractive properties, such as high intrinsic thermal conductivity, excellent chemical and thermal stability, and electrical insulation properties. After being discovered, it has been one of the most intensively studied two-dimensional non-carbon nanomaterials and has been applied in a wide range of applications. To support the exploration of applications of BNNSs, exfoliation, as one of the most promising approaches to realize large-scale production of BNNSs, has been intensively investigated. In this review, methods to yield BNNSs by exfoliation will be summarized and compared with other potential fabrication methods of BNNSs. In addition, the future prospects of the exfoliation of h-BN will also be discussed.

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“…Conversion from fluid to solid phase takes quite a while and commonly happens in an unstable manner, which almost promotes agglomeration . In this work, we have tried supercritical fluid processing (antisolvent) to reduce the aggregate and composite structure flaws of PTFE‐MWCNT composites. The supercritical fluid‐processing method is a very effective method for fabrication of composite coatings.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of robust superhydrophobic coatings using PTFE‐MWCNT nanocomposite: Supercritical fluid processing

Subramanian

Shanmugam

Sathish

2018

Surface & Interface Analysis

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Fabrication of polymer‐carbon composite nanostructure with good dispersion of each other is critical for the desired application due to the nanostructure flaws, agglomeration, and poor absorption between the 2 materials. Fabrication of superhydrophobic surface coating composites of polytetrafluoroethylene (PTFE) with multiwalled carbon nanotubes (MWCNTs) through supercritical fluid processing was explored in this study. Homogeneity of the composite was characterized by X‐ray diffraction and Raman spectroscopy studies, which reveal that the PTFE and MWCNT are uniform in the composite. Microstructural surface evaluation of field‐emission scanning electron microscope and high‐resolution transmission electron microscope studies display that the coating composite possesses roughness structures and fibrillation of the superhydrophobic surface coating. Superhydrophobic character was evaluated on fiber‐reinforced plastic (FRP) sheets, which showed that the prepared coating composite surface showed self‐cleaning properties with a high water contact angle of 162.7°. The surface wettability was studied by increasing different temperatures (30°C to 300°C) in PTFE‐MWCNT composite, which reveals that the FRP sheets were thermally stable up to 200°C and afterward; they transformed from superhydrophobic to hydrophilic state at 250°C. The superhydrophobic surfaces are thermally stable in extreme environmental conditions, and this technique may be used and extendable for large‐scale applications.

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Supercritical fluid processing: a rapid, one-pot exfoliation process for the production of surfactant-free hexagonal boron nitride nanosheets

Abstract: A simple, rapid, one-pot method for generating exfoliated surfactant-free few-layered h-boron nitride by supercritical fluid processing is demonstrated. The product was characterized by AFM, TEM and Raman analyses.

Cited by 81 publications

References 39 publications

Supercritical Fluid‐Facilitated Exfoliation and Processing of 2D Materials

Supercritical Fluid‐Facilitated Exfoliation and Processing of 2D Materials

Fabrication of Boron Nitride Nanosheets by Exfoliation

Fabrication of robust superhydrophobic coatings using PTFE‐MWCNT nanocomposite: Supercritical fluid processing

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