scholarly journals Effect of Graphene Flake Size on Functionalisation: Quantifying Reaction Extent and Imaging Locus with Single Pt atom Tags

2021 ◽  
Author(s):  
Noelia Rubio Carrero ◽  
Milo Sebastian Peter Shaffer ◽  
Heather Au ◽  
Cecilia Mattevi ◽  
Gabriel Oisín Coulter ◽  
...  
Keyword(s):  
Graphene Flake ◽  
Reaction Extent

Here, the locus of functionalisation on graphene-related materials and the progress of the reaction is shown to depend strongly on the starting feedstock. Five characteristically different graphite sources were exfoliated...

scholarly journals Effect of flake size on the mechanical properties of graphene aerogels prepared by freeze casting

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33600-33605 ◽  
Author(s):  
Weiwei Gao ◽  
Nifang Zhao ◽  
Weiquan Yao ◽  
Zhen Xu ◽  
Hao Bai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fatigue Resistance ◽  
Mechanical Performance ◽  
Freeze Casting ◽  
Graphene Flake ◽  
Graphene Aerogels

Graphene flake size has a profound effect on the mechanical performance of the assembled graphene aerogels, particularly their strength, modulus and fatigue resistance under compression.

Synthesis of a MnO2Nanosheet/Graphene Flake Composite and Its Application as a Supercapacitor having High Rate Capability

ChemPlusChem ◽  
2012 ◽  
Vol 77 (10) ◽  
pp. 872-876 ◽  
Author(s):  
Qingxin Chu ◽  
Juan Du ◽  
Wenbo Lu ◽  
Guohui Chang ◽  
Zhicai Xing ◽  
...  
Keyword(s):  
Rate Capability ◽  
High Rate ◽  
High Rate Capability ◽  
Graphene Flake

scholarly journals Quantum Holography in a Graphene Flake with an Irregular Boundary

2018 ◽  
Vol 121 (3) ◽  
Author(s):  
Anffany Chen ◽  
R. Ilan ◽  
F. de Juan ◽  
D. I. Pikulin ◽  
M. Franz
Keyword(s):  
Graphene Flake ◽  
Irregular Boundary

Catalyst-free, self-assembly, and controllable synthesis of graphene flake–carbon nanotube composites for high-performance field emission

Carbon ◽  
2014 ◽  
Vol 67 ◽  
pp. 525-533 ◽  
Author(s):  
Jian-Hua Deng ◽  
Guo-An Cheng ◽  
Rui-Ting Zheng ◽  
Bin Yu ◽  
Guo-Zheng Li ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Self Assembly ◽  
High Performance ◽  
Controllable Synthesis ◽  
Graphene Flake ◽  
Catalyst Free ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

scholarly journals Solution-Processed Hybrid Graphene Flake/2H-MoS2 Quantum Dot Heterostructures for Efficient Electrochemical Hydrogen Evolution

2017 ◽  
Vol 29 (14) ◽  
pp. 5782-5786 ◽  
Author(s):  
Leyla Najafi ◽  
Sebastiano Bellani ◽  
Beatriz Martín-García ◽  
Reinier Oropesa-Nuñez ◽  
Antonio Esau Del Rio Castillo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Hydrogen Evolution ◽  
Graphene Flake ◽  
Solution Processed

Selectively oxidized carbon nanocatalysts for the oxidation of cis-cyclooctene

2018 ◽  
Vol 42 (3) ◽  
pp. 2306-2319 ◽  
Author(s):  
Bruno Jarrais ◽  
Alexandra Guedes ◽  
Cristina Freire
Keyword(s):  
Carbon Nanotubes ◽  
Superior Performance ◽  
Graphene Flake ◽  
Graphene Flakes ◽  
Oxidized Carbon ◽  
Multi Walled Carbon Nanotubes ◽  
Cyclooctene Epoxidation ◽  
Walled Carbon Nanotubes

Selectively oxidized multi-walled carbon nanotubes and graphene flakes showed superior performance in cis-cyclooctene epoxidation: 47% conversion and 79% selectivity for the best in class oxidized MWCNT, and 57% coversion and 85% selectivity for the best graphene flake material.

scholarly journals Solar Metallurgy for Sustainable Zn and Mg Production in a Vacuum Reactor Using Concentrated Sunlight

2020 ◽  
Vol 12 (17) ◽  
pp. 6709 ◽  
Author(s):  
Srirat Chuayboon ◽  
Stéphane Abanades
Keyword(s):  
Carbon Black ◽  
Metal Oxides ◽  
Activated Charcoal ◽  
Carbothermal Reduction ◽  
Total Pressure ◽  
Operation Mode ◽  
Inert Atmosphere ◽  
Pure Metal ◽  
Reactor Outlet ◽  
Reaction Extent

Solar carbothermal reduction of volatile metal oxides represents a promising pyro-metallurgical pathway for the sustainable conversion of both metal oxides and sunlight into metal commodities and fuels in a single process. Nevertheless, there are several scientific challenges in discovering suitable metal oxides candidates for the ease of oxygen extraction from metal oxides to enhance the reaction extent and in designing reactors for the efficient absorption of incident solar radiation to minimize losses. In this study, ZnO and MgO were considered as volatile metal oxides candidates, and their reaction behaviors were studied and compared through gas species production rate, metal oxides conversion, and yield. A solar reactor prototype was developed to facilitate solar carbothermal reduction of ZnO and MgO with different reducing agents comprising activated charcoal and carbon black. The process was operated in a batch operation mode under vacuum and atmospheric pressures to demonstrate the flexibility and reliability of this system for co-production of metals (Zn/Mg) and CO. As a result, decreasing total pressure enhanced conversion of ZnO and MgO, leading to increased Zn and Mg. However, in the case of ZnO, CO yield decreased with decreasing total pressure at the expense of favored CO2 as a result of the decrease of residence time. In contrast, CO2 formation was negligible in the case of MgO, and CO yield thus increased with decreasing pressure. Using activated charcoal as the reducing agent exhibited better conversion of both ZnO and MgO than carbon black thanks to the higher available specific surface area for chemical reactions. MgO and ZnO conversion above 97% and 78%, respectively, and high-purity Mg and Zn content were accomplished, as evidenced by the recovered products at the reactor outlet and filter containing pure metal. In addition, Mg product exhibited strong oxidation reactivity with air, thus requiring inert atmosphere for the handling of Mg-rich powders to avoid direct exposure to air.

Graphene Flake-Based Electrodes for High-Energy and Power Lithium-Ion Semi-flexible Rechargeable Batteries

2020 ◽  
Vol 5 (1) ◽  
pp. 33-38
Author(s):  
Sanjay Kanojia ◽  
Mohd. Imamuddin ◽  
Subhash Mandal ◽  
Debmalya Roy ◽  
Kingsuk Mukhopadhyay ◽  
...  
Keyword(s):  
Lithium Ion ◽  
High Energy ◽  
Rechargeable Batteries ◽  
Graphene Flake

scholarly journals Capillary force-induced superlattice variation atop a nanometer-wide graphene flake and its moiré origin studied by STM

2019 ◽  
Vol 10 ◽  
pp. 804-810
Author(s):  
Loji K Thomas ◽  
Michael Reichling
Keyword(s):  
Capillary Force ◽  
Orientation Angle ◽  
Scanning Tunneling ◽  
Total Expenditure ◽  
Liquid Interfaces ◽  
Tunneling Microscopy ◽  
Graphene Flake ◽  
Before And After ◽  
Solid Liquid Interface ◽  
Solid Liquid

We present strong experimental evidence for the moiré origin of superlattices on graphite by imaging a live transition from one superlattice to another with concurrent and direct measurement of the orientation angle before and after rotation using scanning tunneling microscopy (STM). This has been possible due to a fortuitous observation of a superlattice on a nanometer-sized graphene flake wherein we have induced a further rotation of the flake utilizing the capillary forces at play at a solid–liquid interface using STM tip motion. We propose a more “realistic” tip–surface meniscus relevant to STM at solid–liquid interfaces and show that the capillary force is sufficient to account for the total expenditure of energy involved in the process.

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