Effect of Boron Nitride on the Mechanical and Electrochemical Properties of Cement Composite

2015 ◽  
Author(s):  
Qinyue He ◽  
Xun Yu
Keyword(s):  
Corrosion Resistance ◽  
Boron Nitride ◽  
Electrochemical Properties ◽  
Hexagonal Boron Nitride ◽  
Water Solution ◽  
Cement Composite ◽  
Sodium Cholate ◽  
Ionic Surfactant ◽  
Cement Composites ◽  
Cement Concrete

Hexagonal boron nitride (h-BN) is well known for its unique properties, such as high thermal conductivity, excellent mechanical strength, high electrical insulating, and high chemical stability. This paper studies the effect of h-BN to the mechanical and electrochemical properties of cement concrete. Sodium cholate is used as an ionic surfactant to exfoliate h-BN and subsequently stabilize them in water solution. Different cement concrete samples with different doping levels of h-BN and different sizes of h-BN were prepared for comparisons. Also, steel fiber reinforced h-BN/cement concrete samples were also prepared. The results show that the addition of h-BN can improve the strength of cement composites, and the degree of reinforcement are influenced by the doping levels and feature size of h-BN. The corrosion resistance of h-BN/cement composites were also tested. Experiments results show that h-BN can enhance the corrosion resistance of cement composites.

Hexagonal Boron Nitride and Graphite Oxide Reinforced Multifunctional Porous Cement Composites

2013 ◽  
Vol 23 (45) ◽  
pp. 5624-5630 ◽  
Author(s):  
Mohammad A. Rafiee ◽  
Tharangattu N. Narayanan ◽  
Daniel P. Hashim ◽  
Navid Sakhavand ◽  
Rouzbeh Shahsavari ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Graphite Oxide ◽  
Hexagonal Boron Nitride ◽  
Cement Composites

scholarly journals Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN): role of surfactant upon the electrochemical reduction of oxygen and capacitance applications

2017 ◽  
Vol 5 (8) ◽  
pp. 4103-4113 ◽  
Author(s):  
Aamar F. Khan ◽  
Michael P. Down ◽  
Graham C. Smith ◽  
Christopher W. Foster ◽  
Craig E. Banks
Keyword(s):  
Boron Nitride ◽  
Electrochemical Reduction ◽  
Hexagonal Boron Nitride ◽  
Aqueous Media ◽  
Sodium Cholate ◽  
Electrochemical Reduction Of Oxygen

Surfactant-exfoliated 2D hexagonal boron nitride (2D-hBN) nanosheets are fabricated using the surfactant sodium cholate in aqueous media and are explored towards the electrochemical reduction of oxygen.

scholarly journals Corrosion resistance of monolayer hexagonal boron nitride on copper

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
F. Mahvash ◽  
S. Eissa ◽  
T. Bordjiba ◽  
A. C. Tavares ◽  
T. Szkopek ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride

scholarly journals Self-repairing of polymer-cement concrete

2013 ◽  
Vol 61 (1) ◽  
pp. 195-200 ◽  
Author(s):  
P. Łukowski ◽  
G. Adamczewski
Keyword(s):  
Epoxy Resin ◽  
Building Materials ◽  
Cement Composite ◽  
Material Model ◽  
The Self ◽  
Cement Composites ◽  
Cement Concrete ◽  
Material Optimization ◽  
The Subject ◽  
Self Repair

Abstract Self-repairing means ability to the total or partial recovering of the properties which were worsened as a consequence of damage of the material. The subject of the paper is evaluation of ability to self-repair of a cement composite modified with epoxy resin without a hardener. The methodology of investigation of self-repairing building materials, developed by the authors, has been described, with controllable enforcing of the limited weakening of the material. Also, the self-repair degree has been defined as the measure of self-repairing ability of the building composites. The material model of the epoxy-cement composite has been developed on the basis of the tests results. The material optimization of the composite towards the maximum self-repairing ability has also been carried out. The results of investigation have confirmed the possibility of self-repairing of the cement composite modified with the epoxy resin without hardener. The conclusion and further research needs in the range of the self-repairing epoxy-cement composites have been pointed out

scholarly journals Corrosion Resistance of Modified Hexagonal Boron Nitride (h-BN) Nanosheets Doped Acrylic Acid Coating on Hot-Dip Galvanized Steel

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2340 ◽  
Author(s):  
Yongzhe Fan ◽  
Huazhen Yang ◽  
Haisheng Fan ◽  
Qi Liu ◽  
Chuang Lv ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Boron Nitride ◽  
Acrylic Acid ◽  
Hexagonal Boron Nitride ◽  
Corrosion Current ◽  
Galvanized Steel ◽  
Electrochemical Testing ◽  
Transmission Electron ◽  
Acid Coating

The hexagonal boron nitride (h-BN) nanosheets modified by silane coupling agent (KH560) were doped into acrylic acid coating on the surface of galvanized steel to improve its corrosion resistance. H-BN nanosheets modified by KH560 were prepared and characterised by scanning electron microscopy, transmission electron microscopy, atomic force microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The corrosion resistance of the acrylic acid coatings was measured by electrochemical testing. The results show that the corrosion current density of the coating with modified h-BN nanosheets was reduced from 2.2 × 10−5 A/cm2 to 2.3 × 10−7 A/cm2 compared with the acrylic acid coating. The impedance of the composite coating with modified h-BN is 4435 Ω·cm2, higher than the BNNS coating (2500 Ω·cm2) and the acrylic acid coating (1500 Ω·cm2). This is due to the physical barrier and electrical insulation properties of the hexagonal boron nitride (h-BN) nanosheets.

scholarly journals Hexagonal Boron Nitride Impregnated Silane Composite Coating for Corrosion Resistance of Magnesium Alloys for Temporary Bioimplant Applications

Metals ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 518 ◽  
Author(s):  
Saad Al-Saadi ◽  
Parama Chakraborty Banerjee ◽  
M.R. Anisur ◽  
R.K. Singh Raman
Keyword(s):  
Corrosion Resistance ◽  
Boron Nitride ◽  
Composite Coating ◽  
Magnesium Alloys ◽  
Hexagonal Boron Nitride

Marcus-Hush Theory Revealed by Electron Tunneling Through Hexagonal Boron Nitride

2019 ◽  
Author(s):  
Matěj Velický ◽  
Sheng Hu ◽  
Colin R. Woods ◽  
Peter S. Toth ◽  
Viktor Zólyomi ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Boron Nitride ◽  
Electron Tunneling ◽  
Hexagonal Boron Nitride ◽  
Large Body ◽  
Liquid Solution ◽  
Limiting Current ◽  
Electron Transfer Rate Constant ◽  
Electrochemical Parameters ◽  
Voltammetric Measurements

Marcus-Hush theory of electron transfer is one of the pillars of modern electrochemistry with a large body of supporting experimental evidence presented to date. However, some predictions, such as the electrochemical behavior at microdisk electrodes, remain unverified. Herein, we present a study of electron tunneling across a hexagonal boron nitride barrier between a graphite electrode and redox levels in a liquid solution. This was achieved by the fabrication of microdisk electrodes with a typical diameter of 5 µm. Analysis of voltammetric measurements, using two common redox mediators, yielded several electrochemical parameters, including the electron transfer rate constant, limiting current, and transfer coefficient. They show a significant departure from the Butler-Volmer behavior in a clear manifestation of the Marcus-Hush theory of electron transfer. In addition, our system provides a novel experimental platform, which could be applied to address a number of scientific problems such as identification of reaction mechanisms, surface modification, or long-range electron transfer.

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