Contact angle and surface tension of water on a hexagonal boron nitride monolayer: a methodological investigation

When a drop sits on an atomically thin coating supported by a hydrophilic material, it is possible that the underlying substrate influences the equilibrium contact angle. Such behavior is known as the wetting translucency effect.

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Co-solvent exfoliation and suspension of hexagonal boron nitride

Chemical Communications ◽

10.1039/c4cc07324j ◽

2015 ◽

Vol 51 (1) ◽

pp. 187-190 ◽

Cited By ~ 54

Author(s):

K. L. Marsh ◽

M. Souliman ◽

R. B. Kaner

Keyword(s):

Electron Microscopy ◽

Molecular Weight ◽

Transmission Electron Microscopy ◽

Surface Tension ◽

Boron Nitride ◽

Hexagonal Boron Nitride ◽

Simple Method ◽

Transmission Electron ◽

The Individual

A simple method is presented for exfoliating and suspending hexagonal boron nitride using a co-solvent approach. A 60 w/w% concentration of tert-butanol in water is very effective at exfoliating boron nitride especially when compared to the individual components alone as indicated by UV-vis and transmission electron microscopy. Molecular weight and surface tension are found to play inverse roles in the exfoliation.

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Polyurethane nanocomposite coating with silanized graphene and hexagonal boron nitride as nanoadditives for improved resistance against ultraviolet degradation

Journal of Composite Materials ◽

10.1177/0021998318799402 ◽

2018 ◽

Vol 53 (10) ◽

pp. 1387-1399 ◽

Cited By ~ 3

Author(s):

Thu Van Tran ◽

Farhana Abedin ◽

Aybala Usta ◽

Ramazan Asmatulu

Keyword(s):

Contact Angle ◽

Boron Nitride ◽

Ultraviolet Light ◽

Water Contact Angle ◽

Coating Thickness ◽

Hexagonal Boron Nitride ◽

Light Exposure ◽

Nanocomposite Coating ◽

Water Contact ◽

Polyurethane Coatings

Polyurethane coatings modified with silanized graphene and/or hexagonal boron nitride as nanoadditives were synthesized, characterized, and tested for ultraviolet degradation and hydrophobicity. These coatings containing various weight percentages (wt%) of nanoadditives were prepared and investigated. The coating composition was characterized using Fourier transform infrared spectroscopy. The silanization of nanoadditives was characterized using scanning electron microscopy. The glass transition temperatures (Tg) of the nanocomposite coatings were determined using differential scanning calorimeter; it was observed that the presence of nanoadditives in the coatings impacted the Tg indicating their interference with the polyurethane chains and structures. The change in the coating thickness and water contact angle after ultraviolet light exposure was also studied. Exposure of the coatings to ultraviolet light led to a decrease in the coating thickness and hydrophobicity. With the increasing content of nanoadditives, the decrease in the coating thickness was lower and the rate of decrease of water contact angle was slow. Polyurethane coatings with 0.8 wt% silanized hexagonal boron nitride nanoparticles exhibited minimum reduction in coating thickness and the slowest rate of decrease in the water contact angle.

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NUCLEATE POOL BOILING AND CONDENSATION HEAT TRANSFER CHARACTERISTICS OF HEXAGONAL BORON NITRIDE/DICHLOROMETHANE NANOFLUID

Heat Transfer Research ◽

10.1615/heattransres.2020034308 ◽

2020 ◽

Vol 51 (11) ◽

pp. 1043-1059

Author(s):

Erdem Çiftçi ◽

Adnan Sözen

Keyword(s):

Heat Transfer ◽

Boron Nitride ◽

Hexagonal Boron Nitride ◽

Pool Boiling ◽

Condensation Heat Transfer ◽

Nucleate Pool Boiling ◽

Heat Transfer Characteristics ◽

Transfer Characteristics

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

10.26434/chemrxiv.9275135.v1 ◽

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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