scholarly journals Amphiphilic graphene oxide stabilisation of hexagonal BN and MoS2 sheets

2015 ◽  
Vol 51 (58) ◽  
pp. 11709-11712 ◽  
Author(s):  
M. Haniff Wahid ◽  
Xianjue Chen ◽  
Christopher T. Gibson ◽  
Colin L. Raston
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Molybdenum Disulphide ◽  
Water Dispersible

A simple and scalable method has been developed for directly forming water-dispersible heterolaminar solids involving mixing aqueous solution of amphiphilic graphene oxide with hexagonal boron nitride or molybdenum disulphide in N-methylpyrrolidone.

scholarly journals Electrochemical performance of a self-assembled two-dimensional heterostructure of rGO/MoS2/h-BN

2020 ◽  
Vol 2 (4) ◽  
pp. 1531-1541
Author(s):  
Ashwini P. Alegaonkar ◽  
Prashant S. Alegaonkar ◽  
Satish K. Pardeshi
Keyword(s):  
Graphene Oxide ◽  
Performance Evaluation ◽  
Boron Nitride ◽  
Electrochemical Performance ◽  
Hexagonal Boron Nitride ◽  
Two Dimensional ◽  
Molybdenum Disulphide ◽  
Self Assembled

We report the preparation and electrochemical performance evaluation of a two-dimensional (2D) self-assembled heterostructure of graphene oxide (rGO), molybdenum disulphide (MoS2), and hexagonal boron nitride (h-BN).

scholarly journals Boron nitride nanoplatelets as two-dimensional thermal fillers in epoxy composites: new scenarios at very low filler loadings

2020 ◽  
Vol 40 (10) ◽  
pp. 859-867
Author(s):  
Yao Shi ◽  
Genlian Lin ◽  
Xi-Fei Ma ◽  
Xiao Huang ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Boron Nitride ◽  
Filler Content ◽  
Hexagonal Boron Nitride ◽  
Filler Loading ◽  
Epoxy Composites ◽  
General Phenomenon ◽  
Sudden Drop ◽  
Reduced Graphene ◽  
Thermal Conducting

AbstractHexagonal boron nitride (h-BN) nanoplatelets (0.6 μm in diameter and 100 nm in thickness) are introduced into epoxy resin to improve the polymer’s thermal conducting ability. As expected, the thermal conductivities (TCs) of the composites, especially the in-plane TCs, are significantly increased. The in-plane TC of the epoxy composites can reach 1.67 W/mK at only 0.53 wt% loading, indicating h-BN nanopletelets are very effective thermal fillers. However, after carefully studied the correlation of the TC improvement and filler content, a sudden drop of the TC around 0.53 wt% filler loading is observed. Such an unexpected decrease in TC has never been reported and is also found to be consistent with the Tg changes versus filler content. Similar trend is also observed in other 2-D nanofillers, such as graphene oxide, reduced graphene oxide, which may indicate it is a general phenomenon for 2-D nanofillers. SEM results suggest that such sudden drop in TC might be coming from the enrichment of these 2-D nanofillers in localized areas due to their tendency to form more ordered phase above certain concentrations.

scholarly journals Three-Dimensional Heterostructured Reduced Graphene Oxide-Hexagonal Boron Nitride-Stacking Material for Silicone Thermal Grease with Enhanced Thermally Conductive Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 938 ◽  
Author(s):  
Weijie Liang ◽  
Xin Ge ◽  
Jianfang Ge ◽  
Tiehu Li ◽  
Tingkai Zhao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Boron Nitride ◽  
Reduced Graphene Oxide ◽  
Hexagonal Boron Nitride ◽  
Three Dimensional ◽  
Thermal Interface Materials ◽  
Reduced Graphene ◽  
Thermally Conductive ◽  
Thermal Grease ◽  
Conductive Properties

The thermally conductive properties of silicone thermal grease enhanced by hexagonal boron nitride (hBN) nanosheets as a filler are relevant to the field of lightweight polymer-based thermal interface materials. However, the enhancements are restricted by the amount of hBN nanosheets added, owing to a dramatic increase in the viscosity of silicone thermal grease. To this end, a rational structural design of the filler is needed to ensure the viable development of the composite material. Using reduced graphene oxide (RGO) as substrate, three-dimensional (3D) heterostructured reduced graphene oxide-hexagonal boron nitride (RGO-hBN)-stacking material was constructed by self-assembly of hBN nanosheets on the surface of RGO with the assistance of binder for silicone thermal grease. Compared with hBN nanosheets, 3D RGO-hBN more effectively improves the thermally conductive properties of silicone thermal grease, which is attributed to the introduction of graphene and its phonon-matching structural characteristics. RGO-hBN/silicone thermal grease with lower viscosity exhibits higher thermal conductivity, lower thermal resistance and better thermal management capability than those of hBN/silicone thermal grease at the same filler content. It is feasible to develop polymer-based thermal interface materials with good thermal transport performance for heat removal of modern electronics utilising graphene-supported hBN as the filler at low loading levels.

Investigation on Microstructure Characteristics and Tribological Properties of Self-Lubricating Metallic Composites Based on Hexagonal Boron Nitride and Molybdenum Disulphide

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Biao Zhao ◽  
Wenfeng Ding ◽  
Guohua Jiang ◽  
Xianying Li ◽  
Jiuhua Xu
Keyword(s):  
Boron Nitride ◽  
Flexural Strength ◽  
Hexagonal Boron Nitride ◽  
Metallic Matrix ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Liquid Phase Sintering ◽  
Molybdenum Disulphide ◽  
Microstructure Characteristics ◽  
Metallic Composites

Abstract In this work, hexagonal boron nitride (hBN)- and molybdenum disulphide (MoS2)-embedded metallic composites were fabricated via liquid-phase sintering. The mechanical property and tribological performance of different samples that contain 5, 7.5, 10, 12.5, and 15 wt% solid lubricants were evaluated. Morphologies, such as micropores and ball and scratch, were characterized after the rotating sliding tests. A high lubricant concentration could adversely affect the flexural strength of as-sintered samples because of the formation and coalescences of micropores. In comparison with MoS2-containing samples under the same lubricant concentrations, the hBN-containing samples exhibited lower flexural strength and density caused by amounts of spherical small and irregular large micropores. Furthermore, the best tribological combination could be achieved in terms of the friction coefficient, wear-rate, and morphologies of balls by applying 7.5 wt% MoS2 particles in the metallic matrix.

Boron Nitride Doped Polypyrrole Hybrid Composites for Photocatalytic Degradation of 2-Chlorophenol from Aqueous Solution

2020 ◽  
Vol 301 ◽  
pp. 145-152 ◽  
Author(s):  
Faizah Yunus ◽  
Muhammad Syazwan Kassim ◽  
Syed Shahabuddin ◽  
Nur Rahimah Said ◽  
Siti Nor Atika Baharin
Keyword(s):  
Aqueous Solution ◽  
Boron Nitride ◽  
Photocatalytic Degradation ◽  
Hybrid Composites ◽  
Hexagonal Boron Nitride ◽  
Solar Irradiation ◽  
X Ray Diffraction ◽  
Initial Concentration ◽  
Polymerization Method

This investigation focused on the photocatalytic degradation of o2-chlorophenol in aqueous solution by using hexagonal boron nitride (h-BN) doped polypyrrole (PPy) composite under solar irradiation. The composite was prepared via in-situ oxidation polymerization method using FeCl3 as oxidation agent. The synthesized h-BN/PPy composite were comprehensively characterized using x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The photodegradation of 2-chlorophenol was performed under direct sunlight for 180 minutes with initial concentration (50-250 mg/L) and pH (3-9). h-BN/PPy composite efficiently degraded 2-chlorophenol (91.1%) with optimum conditions at pH 6 and 50 mg/L initial concentration compared to PPy and h-BN.

scholarly journals Research on tribological properties of oil containing graphene oxide or hexagonal boron nitride

2020 ◽  
Vol 68 (4) ◽  
pp. 29-55
Author(s):  
Patrycja Magdalena Nogas ◽  
Krzysztof Gocman ◽  
Tadeusz Kałdoński
Keyword(s):  
Graphene Oxide ◽  
Boron Nitride ◽  
Reduced Graphene Oxide ◽  
Tribological Properties ◽  
Surface Engineering ◽  
Electronic Materials ◽  
Hexagonal Boron Nitride ◽  
University Of Technology ◽  
Reduced Graphene ◽  
The Military

The aim of this publication is to present the results of studies on the SN-650 oil base with various concentrations of graphene oxide (GO), reduced graphene oxide (rGO) produced by the Institute of Electronic Materials Technology in Warsaw and hexagonal boron nitride (h-BN) produced according to the technology developed at the Military University of Technology. The first part of the publication presents basic information about graphene oxide and the possibilities of its use, in particular in the field of tribology. The second part of the publication presents the results of tests of lubricity properties of the samples with the addition of 0.05%, 0.1%, 0.5%, 1% and 2% of graphene oxide, reduced graphene oxide or hexagonal boron nitride. The measurements were carried out using the UNMT universal nano/microtester tester and the T-02 four-ball device, at the Department of Tribology, Surface Engineering and Logistics of Service Fluids, which is a part of the Institute of Mechanical Vehicles and Transport of the Mechanical Faculty of the Military University of Technology. The obtained results have demonstrated the beneficial effect of introducing additions in the form of graphene oxide or hexagonal boron nitride onto the tribological properties of the oil base. Keywords: graphene, hexagonal boron nitride, graphene oxide, oil base

scholarly journals Development of novel graphene-like layered hexagonal boron nitride for adsorptive removal of antibiotic gatifloxacin from aqueous solution

2014 ◽  
Vol 7 (4) ◽  
pp. 330-336 ◽  
Author(s):  
Yanhong Chao ◽  
Wenshuai Zhu ◽  
Jiaxin Chen ◽  
Peiwen Wu ◽  
Xiangyang Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Adsorptive Removal
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