Shear stress mediated scrolling of graphene oxide

Abstract

Graphene oxide scrolls (GOS) are fabricated in high yield from a colloidal suspension of graphene oxide (GO) sheets under shear stress in a vortex fluidic device (VFD) while irradiated with a pulsed laser operating at 1064 nm and 250 mJ. This is in the absence of any other reagents with the structure of the GOS established using powder X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, X-ray photoelectron spectroscopy, Raman spectroscopy, transmission electron microscopy, atomic force microscopy and scanning electron microscopy.

Vortex fluidic mediated transformation of graphite into highly conducting graphene scrolls

“…15 Scrolls are an attractive alternative to the two-dimensional form, retaining many of the desirable properties of both carbon nanotubes and graphene sheets. Graphene scrolls vary in compactness depending on the method of fabrication [16][17][18][19][20][21][22][23][24][25][26][27][28] and present the same enhanced carrier mobility as graphene but can be manipulated in the same manner as multi-walled carbon nanotubes (MWCNTs). However, unlike MWCNTs, the inner diameter of a scroll can be easily modied depending on the scrolling mechanism 19,20 making them especially attractive for applications such as hydrogen storage 29,30 and in supercapacitors.…”

“…However, unlike MWCNTs, the inner diameter of a scroll can be easily modied depending on the scrolling mechanism 19,20 making them especially attractive for applications such as hydrogen storage 29,30 and in supercapacitors. 27,31 Over the years a variety of methods to produce graphene scrolls have been explored and are typically based on (a) the separation of graphite layers using intercalating molecules, 22 (b) using graphene oxide as a graphene derivative due to its ability to be well dispersed in aqueous media 17,[23][24][25][26][27][28] or (c) the use of mechanical methods which can be damaging, such as sonication. 19,20 These methods have limited applications, as they generate materials in low yields with induced damage to the graphene.…”

“…The challenges of producing graphene scrolls in high yields directly from graphite akes are well documented. [16][17][18][19][20][21][22][23][24][25][26][27][28] We have established that they can be overcome using thin lm micro-uidics, in the vortex uidic device (VFD). 32,33 This device imparts mechanical energy to the thin lm which amplies interfacial tension between immiscible liquids.…”

Vortex Fluidic Mediated Synthesis of TiO2 Nanoparticle/MXene Composites

“…[33] The VFD is a versatile thin film device effective for a growing number of applications, including in situ decorating h-BN with magnetite nanoparticles, [34] fabricating carbon dots from multi-walled carbon nanotubes, [35] chemo selective hydrogenation using cellulose impregnated with Pd NPs lining the VFD tube, [36] organic synthesis, [37][38] probing the structure of self-organised systems, [39][40] exfoliation and scrolling of h-BN and graphite, [41][42][43] slicing CNTs, [44][45] to mention a few. [41,[46][47][48][49][50][51][52][53][54] The VFD typically houses a borosilicate glass tube (O.D. diameter 20 mm, I.D.…”

Dynamic thin film mediated slicing of boron nitride nanotubes

“…Beyond the above mentioned slicing of CNTs, 28,29 it has been used to decorate h-BN with magnetite nanoparticles involving an in situ laser ablation of an iron rod above the dynamic thin lm, 34 probe the structure of self-organised systems, 35 and control organic synthesis, 31,36 catalysis, 37 the formation of carbon dots, 38 and more. 30,32,[39][40][41] Experimental Materials BNNTs were purchased from NanoIntegris with a purity $ 50% and average tube length and diameter ca. 200 mm and 5 nm, respectively, as specied by the company.…”