High shear-induced exfoliation of graphite into high quality graphene by Taylor–Couette flow

RSC Advances ◽  
2016 ◽  
Vol 6 (15) ◽  
pp. 12003-12008 ◽  
Author(s):  
Tuan Sang Tran ◽  
Seung Jun Park ◽  
Sung Sic Yoo ◽  
Tae-Rin Lee ◽  
TaeYoung Kim
Keyword(s):  
Flow Regime ◽  
Vortex Flow ◽  
Taylor Vortex ◽  
High Shear ◽  
High Quality ◽  
Layer Graphene ◽  
Taylor Vortex Flow ◽  
Shear Mixing ◽  
Few Layer Graphene ◽  
Bulk Production

A scalable method to produce high-quality graphene by shear-exfoliation of graphite is presented. High shear mixing of graphite in the Taylor vortex flow regime allows for the bulk production of few-layer graphene with low content of defects.

Facile and economical mass production of graphene dispersions and flakes

2014 ◽  
Vol 2 (12) ◽  
pp. 4132-4135 ◽  
Author(s):  
Min Mao ◽  
Shuzhen Chen ◽  
Ping He ◽  
Hailin Zhang ◽  
Hongtao Liu
Keyword(s):  
Ball Milling ◽  
Mass Production ◽  
Milling Process ◽  
High Quality ◽  
Layer Graphene ◽  
Ball Milling Process ◽  
Graphene Flakes ◽  
Few Layer Graphene ◽  
Bulk Production

A facile and economical strategy for the bulk production of aqueous graphene dispersions and high-quality few-layer graphene flakes via a simple ball milling process assisted with non-ionic industrial surfactant.

Development and Effects of Super-Critical Taylor-Vortex Flow in a Lightly Loaded Journal Bearing

1974 ◽  
Vol 96 (1) ◽  
pp. 28-35 ◽  
Author(s):  
R. C. DiPrima ◽  
J. T. Stuart
Keyword(s):  
Vortex Flow ◽  
Axial Direction ◽  
Basic Flow ◽  
Circular Cylinders ◽  
Taylor Vortex ◽  
Taylor Vortices ◽  
Taylor Vortex Flow ◽  
Secondary Motion ◽  
The Stability ◽  
Unified Description

At sufficiently high operating speeds in lightly loaded journal bearings the basic laminar flow will be unstable. The instability leads to a new steady secondary motion of ring vortices around the cylinders with a regular periodicity in the axial direction and a strength that depends on the azimuthial position (Taylor vortices). Very recently published work on the basic flow and the stability of the basic flow between eccentric circular cylinders with the inner cylinder rotating is summarized so as to provide a unified description. A procedure for calculating the Taylor-vortex flow is developed, a comparison with observed properties of the flow field is made, and formulas for the load and torque are given.

Effect of Inhomogeneous Mixing on Chemical Reaction in a Taylor Vortex Flow Reactor

2002 ◽  
Vol 35 (7) ◽  
pp. 692-695 ◽  
Author(s):  
Naoto Ohmura ◽  
Hirokazu Okamoto ◽  
Tsukasa Makino ◽  
Kunio Kataoka
Keyword(s):  
Chemical Reaction ◽  
Vortex Flow ◽  
Flow Reactor ◽  
Taylor Vortex ◽  
Taylor Vortex Flow

scholarly journals Growth of Ordered Graphene Ribbons by Sublimation Epitaxy

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 449
Author(s):  
Shuxian Cai ◽  
Xingfang Liu ◽  
Xin Zheng ◽  
Zhonghua Liu
Keyword(s):  
Substrate Surface ◽  
Graphene Film ◽  
Graphene Ribbon ◽  
High Quality ◽  
Graphene Layers ◽  
Force Microscopy ◽  
Layer Graphene ◽  
Micro Raman Spectroscopy ◽  
Atomic Force ◽  
Few Layer Graphene

Ordered graphene ribbons were grown on the surface of 4° off-axis 4H-SiC wafers by sublimation epitaxy, and characterized by using scanning electron microscopy (SEM), atomic force microscopy (AFM) and micro-Raman spectroscopy (μ-Raman). SEM showed that there were gray and dark ribbons on the substrate surface, and AFM further revealed that these ordered graphene ribbons had clear stepped morphologies due to surface step-bunching. It was shown by μ-Raman that the numbers of graphene layers of these two types of regions were different. The gray region was composed of mono- or bilayer ordered graphene ribbon, while the dark region was of tri- or few-layer ribbon. Meanwhile, ribbons were all homogeneous and had a width up to 40 μm and a length up to 1000 μm, without micro defects such as grain boundaries, ridges, or mono- and few-layer graphene mixtures. The results of this study are useful for optimized growth of high-quality graphene film on silicon carbide crystal.

Numerical investigation of supercritical Taylor-vortex flow for a wide gap

1984 ◽  
Vol 138 ◽  
pp. 21-52 ◽  
Author(s):  
H. Fasel ◽  
O. Booz
Keyword(s):  
Flow Field ◽  
Vortex Flow ◽  
Numerical Solutions ◽  
Stokes Equations ◽  
Taylor Number ◽  
Taylor Vortex ◽  
Plane Boundary ◽  
Aspect Ratios ◽  
Taylor Vortex Flow ◽  
Wide Gap

For a wide gap (R1/R2= 0.5) and large aspect ratiosL/d, axisymmetric Taylor-vortex flow has been observed in experiments up to very high supercritical Taylor (or Reynolds) numbers. This axisymmetric Taylor-vortex flow was investigated numerically by solving the Navier–Stokes equations using a very accurate (fourth-order in space) implicit finite-difference method. The high-order accuracy of the numerical method, in combination with large numbers of grid points used in the calculations, yielded accurate and reliable results for large supercritical Taylor numbers of up to 100Tac(or 10Rec). Prior to this study numerical solutions were reported up to only 16Tac. The emphasis of the present paper is placed upon displaying and elaborating the details of the flow field for large supercritical Taylor numbers. The flow field undergoes drastic changes as the Taylor number is increased from just supercritical to 100Tac. Spectral analysis (with respect toz) of the flow variables indicates that the number of harmonics contributing substantially to the total solution increases sharply when the Taylor number is raised. The number of relevant harmonics is already unexpectedly high at moderate supercriticalTa. For larger Taylor numbers, the evolution of a jetlike or shocklike flow structure can be observed. In the axial plane, boundary layers develop along the inner and outer cylinder walls while the flow in the core region of the Taylor cells behaves in an increasingly inviscid manner.

Numerical solution of turbulent Taylor-vortex flow

1993 ◽  
Vol 48 (1) ◽  
pp. 13-24
Author(s):  
J.F. Hasiuk ◽  
J.D. Iversen ◽  
R.H. Pletcher ◽  
R.G. Hindman
Keyword(s):  
Numerical Solution ◽  
Vortex Flow ◽  
Taylor Vortex ◽  
Taylor Vortex Flow

Effect of a crystal-melt interface on Taylor-vortex flow with buoyancy

2020 ◽  
pp. 105-119
Author(s):  
G B McFadden ◽  
B T Murray ◽  
S R Coriell ◽  
M E Glicksman ◽  
M E Selleck
Keyword(s):  
Vortex Flow ◽  
Taylor Vortex ◽  
Taylor Vortex Flow
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