scholarly journals Mechanism of water transport in graphene oxide laminates

2017 ◽  
Vol 8 (3) ◽  
pp. 1701-1704 ◽  
Author(s):  
Junjiao Deng ◽  
Yi You ◽  
Heriberto Bustamante ◽  
Veena Sahajwalla ◽  
Rakesh K. Joshi
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Water Transport ◽  
Transport Mechanisms

The water transport mechanisms recently proposed by various researchers suggest that membranes composed of graphene oxide laminates could be regarded as an assembly of many tiny carbon nanotubes stacked together with attached functional groups as spacers.

Effects of Edge Functional Groups on Water Transport in Graphene Oxide Membranes

2019 ◽  
Vol 11 (8) ◽  
pp. 8483-8491 ◽  
Author(s):  
Ruosang Qiu ◽  
Shi Yuan ◽  
Jie Xiao ◽  
Xiao Dong Chen ◽  
Cordelia Selomulya ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Water Transport ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

scholarly journals Graphene oxide-multiwalled carbon nanotubes composite as an anode for lithium ion batteries

2016 ◽  
Vol 34 (3) ◽  
pp. 481-486 ◽  
Author(s):  
Łukasz Majchrzycki ◽  
Mariusz Walkowiak ◽  
Agnieszka Martyła ◽  
Mikhail Y. Yablokov ◽  
Marek Nowicki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Reduced Graphene Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Functional Groups ◽  
Lithium Ion ◽  
Lithium Storage ◽  
Multiwalled Carbon ◽  
Reduced Graphene

AbstractNowadays reduced graphene oxide (rGO) is regarded as a highly interesting material which is appropriate for possible applications in electrochemistry, especially in lithium-ion batteries (LIBs). Several methods were proposed for the preparation of rGO-based electrodes, resulting in high-capacity LIBs anodes. However, the mechanism of lithium storage in rGO and related materials is still not well understood. In this work we focused on the proposed mechanism of favorable bonding sites induced by additional functionalities attached to the graphene planes. This mechanism might increase the capacity of electrodes. In order to verify this hypothesis the composite of non-reduced graphene oxide (GO) with multiwalled carbon nanotubes electrodes was fabricated. Electrochemical properties of GO composite anodes were studied in comparison with similarly prepared electrodes based on rGO. This allowed us to estimate the impact of functional groups on the reversible capacity changes. As a result, it was shown that oxygen containing functional groups of GO do not create, in noticeable way, additional active sites for the electrochemical reactions of lithium storage, contrary to what has been postulated previously.

scholarly journals Water transport through graphene oxide membranes: the roles of driving forces

2018 ◽  
Vol 54 (20) ◽  
pp. 2554-2557 ◽  
Author(s):  
J. Y. Chong ◽  
B. Wang ◽  
K. Li
Keyword(s):  
Graphene Oxide ◽  
Water Transport ◽  
Driving Forces ◽  
Transport Mechanisms ◽  
Evaporation Model ◽  
Pore Flow ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

A pore-flow–evaporation model was proposed to explain the water transport mechanisms in graphene oxide membranes in pervaporation.

scholarly journals Mechanical Properties of Graphene Oxide Coupled by Multi-Physical Field: Grain Boundaries and Functional Groups

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 62
Author(s):  
Xu Xu ◽  
Zeping Zhang ◽  
Wenjuan Yao
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Grain Boundaries ◽  
Functional Groups ◽  
Oxygen Content ◽  
Tensile Fracture ◽  
Hydroxyl Groups ◽  
Molecular Configuration ◽  
Spatial Design ◽  
Out Of Plane

Graphene and graphene oxide (GO) usually have grain boundaries (GBs) in the process of synthesis and preparation. Here, we “attach” GBs into GO, a new molecular configuration i.e., polycrystalline graphene oxide (PGO) is proposed. This paper aims to provide an insight into the stability and mechanical properties of PGO by using the molecular dynamics method. For this purpose, the “bottom-up” multi-structure-spatial design performance of PGO and the physical mechanism associated with the spatial structure in mixed dimensions (combination of sp2 and sp3) were studied. Also, the effect of defect coupling (GBs and functional groups) on the mechanical properties was revealed. Our results demonstrate that the existence of the GBs reduces the mechanical properties of PGO and show an “induction” role during the tensile fracture process. The presence of functional groups converts in-plane sp2 carbon atoms into out-of-plane sp3 hybrid carbons, causing uneven stress distribution. Moreover, the mechanical characteristics of PGO are very sensitive to the oxygen content of functional groups, which decrease with the increase of oxygen content. The weakening degree of epoxy groups is slightly greater than that of hydroxyl groups. Finally, we find that the mechanical properties of PGO will fall to the lowest values due to the defect coupling amplification mechanism when the functional groups are distributed at GBs.

Comparative cytotoxicity of kaolinite, halloysite, multiwalled carbon nanotubes and graphene oxide

2021 ◽  
Vol 205 ◽  
pp. 106041
Author(s):  
Elvira Rozhina ◽  
Svetlana Batasheva ◽  
Regina Miftakhova ◽  
Xuehai Yan ◽  
Anna Vikulina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon
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