scholarly journals Enhanced catalysis through structurally modified hybrid 2-D boron nitride nanosheets comprising of complexed 2-hydroxy-4-methoxybenzophenone motif

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pooja Rana ◽  
Ranjana Dixit ◽  
Shivani Sharma ◽  
Sriparna Dutta ◽  
Sneha Yadav ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Rational Design ◽  
Surface Engineering ◽  
Structural Integrity ◽  
Hexagonal Boron Nitride ◽  
Cycloaddition Reaction ◽  
Rational Surface ◽  
Hybrid Nanomaterial ◽  
Catalytic Potential ◽  
Structural Architecture

AbstractTuning the structural architecture of the pristine two dimensional hexagonal boron nitride (h-BN) nanosheets through rational surface engineering have proven advantageous in the fabrication of competent catalytic materials. Inspired by the performance of h-BN based nanomaterials in expediting key organic transformations, we channelized our research efforts towards engineering the inherent surface properties of the exclusively stacked h-BN nanosheets through the incorporation of a novel competent copper complex of a bidentate chelating ligand 2-hydroxy-4-methoxybenzophenone (BP). Delightfully, this hybrid nanomaterial worked exceptionally well in boosting the [3 + 2] cycloaddition reaction of azide and nitriles, providing a facile access to a diverse variety of highly bioactive tetrazole motifs. A deep insight into the morphology of the covalently crafted h-BN signified the structural integrity of the exfoliated h-BN@OH nanosheets that exhibited lamellar like structures possessing smooth edges and flat surface. This interesting morphology could also be envisioned to augment the catalysis by allowing the desired surface area for the reactants and thus tailoring their activity. The work paves the way towards rational design of h-BN based nanomaterials and adjusting their catalytic potential by the use of suitable complexes for promoting sustainable catalysis, especially in view of the fact that till date only a very few h-BN nanosheets based catalysts have been devised.

scholarly journals Enhanced Catalysis through Structurally Modified Hybrid 2-D Boron Nitride Nanosheets Comprising of Complexed 2-hydroxy-4- methoxybenzophenone Motif

2021 ◽  
Author(s):  
Pooja Rana ◽  
Ranjana Dixit ◽  
Shivani Sharma ◽  
Sriparna Dutta ◽  
Sneha Yadav ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Rational Design ◽  
Surface Engineering ◽  
Structural Integrity ◽  
Hexagonal Boron Nitride ◽  
Cycloaddition Reaction ◽  
Rational Surface ◽  
Organic Transformations ◽  
Hybrid Nanomaterial ◽  
Catalytic Potential

Abstract Tuning the scturtrual architecture of the pristine two dimensional hexagonal boron nitride (h-BN) nanosheets through rational surface engineering can prove advantageous in the fabrication of competent catalytic materials. Inspired by the performance of h-BN based nanomaterials in expediting key organic transformations, we channelized our research efforts towards engineering the inherent surface properties of the exclusively stacked h-BN through the incorporation of a novel competent copper complex of a bidentate chelating ligand 2-hydroxy-4-methoxybenzophenone. Delightfully, this hybrid nanomaterial worked exceptionally well in boosting the [3+2] cycloaddition reaction of azide and nitriles, providing a facile access to a diverse variety of highly bioactive tetrazole motifs. A deep insight into the morphology of the covalently crafted h-BN signified the structural integrity of the exfoliated h-BN@OH nanosheets that exhibited lamellar like structures possessing smooth edges and flat surface. This interesting morphology could also be envisioned to augment the catalysis by allowing the desired surface area for the reactants and thus tailoring their activity. The work paves the way towards rational design of h-BN based nanomaterials and adjusting their catalytic potential by the use of suitable complexes for promoting sustainable catalysis, especially in view of the fact that till date only a very few h-BN nanosheets based catalysts have been devised.

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 Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

2021 ◽  
Vol 9 ◽  
Author(s):  
Neha Sharma ◽  
Bharat Ugale ◽  
Sunil Kumar ◽  
Kamalakannan Kailasam
Keyword(s):  
Rational Design ◽  
Structural Integrity ◽  
Cycloaddition Reaction ◽  
Value Added ◽  
Cyclic Carbonate ◽  
Energy Crisis ◽  
Water Stability ◽  
High Chemical ◽  
Efficient Catalyst ◽  
Microporous Polymer

The capture and catalytic conversion of CO2 into value-added chemicals is a promising and sustainable approach to tackle the global warming and energy crisis. The nitrogen-rich porous organic polymers are excellent materials for CO2 capture and separation. Herein, we present a nitrogen-rich heptazine-based microporous polymer for the cycloaddition reaction of CO2 with epoxides in the absence of metals and solvents. HMP-TAPA, being rich in the nitrogen site, showed a high CO2 uptake of 106.7 mg/g with an IAST selectivity of 30.79 toward CO2 over N2. Furthermore, HMP-TAPA showed high chemical and water stability without loss of any structural integrity. Besides CO2 sorption, the catalytic activity of HMP-TAPA was checked for the cycloaddition of CO2 and terminal epoxides, resulting in cyclic carbonate with high conversion (98%). They showed remarkable recyclability up to 5 cycles without loss of activity. Overall, this study represents a rare demonstration of the rational design of POPs (HMP-TAPA) for multiple applications.

Rational design of the carbon doping of hexagonal boron nitride for oxygen activation and oxidative desulfurization

2020 ◽  
Vol 22 (42) ◽  
pp. 24310-24319
Author(s):  
Hongping Li ◽  
Wendi Fu ◽  
Jie Yin ◽  
Jinrui Zhang ◽  
Yujun Li ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Catalytic Oxidation ◽  
Rational Design ◽  
Hexagonal Boron Nitride ◽  
Great Influence ◽  
Oxidative Desulfurization ◽  
Oxygen Activation ◽  
Carbon Doping ◽  
Oxidation Performance

The doping of hexagonal boron nitride (h-BN) materials has a great influence on their catalytic oxidation performance, but the mechanism of doping has still not been studied in-depth to date.

scholarly journals First-Principles Study of the Electronic Properties and Thermal Expansivity of a Hybrid 2D Carbon and Boron Nitride Material

2021 ◽  
Vol 7 (1) ◽  
pp. 5
Author(s):  
Okikiola Olaniyan ◽  
Lyudmila V. Moskaleva
Keyword(s):  
Thermal Properties ◽  
Boron Nitride ◽  
First Principles ◽  
Low Temperatures ◽  
High Performance ◽  
Rational Design ◽  
Hexagonal Boron Nitride ◽  
Linear Thermal Expansion ◽  
Structure Characteristic ◽  
Mechanical And Thermal Properties

In an attempt to push the boundary of miniaturization, there has been a rising interest in two-dimensional (2D) semiconductors with superior electronic, mechanical, and thermal properties as alternatives for silicon-based devices. Due to their fascinating properties resulting from lowering dimensionality, hexagonal boron nitride (h-BN) and graphene are considered promising candidates to be used in the next generation of high-performance devices. However, neither h-BN nor graphene is a semiconductor due to a zero bandgap in the one case and a too large bandgap in the other case. Here, we demonstrate from first-principles calculations that a hybrid 2D material formed by cross-linking alternating chains of carbon and boron nitride (HCBN) shows promising characteristics combining the thermal merits of graphene and h-BN while possessing the electronic structure characteristic of a semiconductor. Our calculations demonstrate that the thermal properties of HCBN are comparable to those of h-BN and graphene (parent systems). HCBN is dynamically stable and has a bandgap of 2.43 eV. At low temperatures, it exhibits smaller thermal contraction than the parent systems. However, beyond room temperature, in contrast to the parent systems, it has a positive but finitely small linear-thermal expansion coefficient. The calculated isothermal bulk modulus indicates that at high temperatures, HCBN is less compressible, whereas at low temperatures it is more compressible relative to the parent systems. The results of our study are important for the rational design of a 2D semiconductor with good thermal properties.

Molecular insights on the dynamic stability of peptide nucleic acid functionalized carbon and boron nitride nanotubes

2021 ◽  
Vol 23 (1) ◽  
pp. 219-228
Author(s):  
Nabanita Saikia ◽  
Mohamed Taha ◽  
Ravindra Pandey
Keyword(s):  
Nucleic Acid ◽  
Boron Nitride ◽  
Nucleic Acids ◽  
Dynamic Stability ◽  
Peptide Nucleic Acid ◽  
Rational Design ◽  
Peptide Nucleic Acids ◽  
Boron Nitride Nanotubes ◽  
Molecular Hybrids ◽  
Single Wall Nanotubes

The rational design of self-assembled nanobio-molecular hybrids of peptide nucleic acids with single-wall nanotubes rely on understanding how biomolecules recognize and mediate intermolecular interactions with the nanomaterial's surface.

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.

Sign in / Sign up

Export Citation Format

Share Document