scholarly journals Graphene – Diamond Nanomaterials: A Status Quo Review

2021 ◽  
Author(s):  
Jana Vejpravová
Keyword(s):  
Carbon Nanomaterials ◽  
Chemical Reactivity ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Electronic Energy ◽  
New Class ◽  
Current State ◽  
Carbon Networks ◽  
Application Potential ◽  
And Chemical Properties

Carbon nanomaterials with a different character of the chemical bond – graphene (sp2) and nanodiamond (sp3) are the building bricks for a new class of all-carbon hybrid nanomaterials, where the two different carbon networks with the sp3 and sp2 hybridization coexist, interact and even transform into one another. The unique electronic, mechanical, and chemical properties of the two border nanoallotropes of carbon ensure the immense application potential and versatility of these all-carbon graphene – diamond nanomaterials. The review gives an overview of the current state of the art of graphene – diamond nanomaterials, including their composites, heterojunctions, and other hybrids for sensing, electronic, energy storage, and other applications. Also, the graphene-to-diamond and diamond-to-graphene transformations at the nanoscale, essential for innovative fabrication, and stability and chemical reactivity assessment are discussed based on extensive theoretical, computational, and experimental studies.

scholarly journals Topological invariants for the line graphs of some classes of graphs

2019 ◽  
Vol 17 (1) ◽  
pp. 1483-1490
Author(s):  
Xiaoqing Zhou ◽  
Mustafa Habib ◽  
Tariq Javeed Zia ◽  
Asim Naseem ◽  
Anila Hanif ◽  
...  
Keyword(s):  
Communication Theory ◽  
Chemical Reactivity ◽  
Line Graph ◽  
Chemical Properties ◽  
Topological Invariants ◽  
Line Graphs ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
Ladder Graphs ◽  
And Chemical Properties

AbstractGraph theory plays important roles in the fields of electronic and electrical engineering. For example, it is critical in signal processing, networking, communication theory, and many other important topics. A topological index (TI) is a real number attached to graph networks and correlates the chemical networks with physical and chemical properties, as well as with chemical reactivity. In this paper, our aim is to compute degree-dependent TIs for the line graph of the Wheel and Ladder graphs. To perform these computations, we first computed M-polynomials and then from the M-polynomials we recovered nine degree-dependent TIs for the line graph of the Wheel and Ladder graphs.

scholarly journals Recent Developments towards Commercialization of Metal Matrix Composites

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2828
Author(s):  
Dae-Young Kim ◽  
Hyun-Joo Choi
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Chemical Properties ◽  
High Strength ◽  
Electronic Energy ◽  
Matrix Composites ◽  
Wide Range ◽  
Recent Developments ◽  
Processing Material ◽  
And Chemical Properties

Metal matrix composites (MMCs) are promising alternatives to metallic alloys. Their high strength-to-weight ratios; high temperature stabilities; and unique thermal, electrical, and chemical properties make them suitable for automotive, aerospace, defense, electrical, electronic, energy, biomedical, and other applications. The wide range of potential combinations of materials allows the properties of MMCs to be tailored by manipulating the morphology, size, orientation, and fraction of reinforcement, offering further opportunities for a variety of applications in daily life. This Special Issue, “Metal Matrix Composites”, addresses advances in the material science, processing, material modeling and characterization, performance, and testing of metal matrix composites.

The recent progress of nitrogen-doped carbon nanomaterials for electrochemical batteries

2018 ◽  
Vol 6 (27) ◽  
pp. 12932-12944 ◽  
Author(s):  
Jingxia Wu ◽  
Zhiyong Pan ◽  
Ye Zhang ◽  
Bingjie Wang ◽  
Huisheng Peng
Keyword(s):  
Electrochemical Properties ◽  
Nitrogen Doping ◽  
Recent Progress ◽  
Carbon Nanomaterials ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Physical And Chemical ◽  
And Chemical Properties

Nitrogen-doping represents a general and effective method in adjusting the physical and chemical properties of carbon nanomaterials. The recent progress in the synthesis of nitrogen-doped carbon nanomaterials and their applications in batteries are carefully discussed with a focus on their electrochemical properties.

scholarly journals On the Violence of High Explosive Reactions

2005 ◽  
Vol 127 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Craig M. Tarver ◽  
Steven K. Chidester
Keyword(s):  
High Explosive ◽  
Chemical Properties ◽  
Subsequent Reaction ◽  
Energy Delivery ◽  
Current State ◽  
Slow Combustion ◽  
Shear Heating ◽  
Deposition Processes ◽  
Physical And Chemical ◽  
And Chemical Properties

High explosive reactions can be caused by three general energy deposition processes: impact ignition by frictional and/or shear heating; bulk thermal heating; and shock compression. The violence of the subsequent reaction varies from benign slow combustion to catastrophic detonation of the entire charge. The degree of violence depends on many variables, including the rate of energy delivery, the physical and chemical properties of the explosive, and the strength of the confinement surrounding the explosive charge. The current state of experimental and computer-modeling research on the violence of impact, thermal, and shock-induced reactions is briefly reviewed in this paper.

ON THE WIENER INDEX OF F_H SUMS OF GRAPHS

2021 ◽  
Vol 3 (2) ◽  
pp. 37-57
Author(s):  
L. Alex ◽  
Indulal G
Keyword(s):  
Complete Graph ◽  
Cartesian Product ◽  
Chemical Properties ◽  
Wiener Index ◽  
Topological Indices ◽  
Single Vertex ◽  
Molecular Graphs ◽  
New Class ◽  
And Chemical Properties

Wiener index is the first among the long list of topological indices which was used to correlate structural and chemical properties of molecular graphs. In \cite{Eli} M. Eliasi, B. Taeri defined four new sums of graphs based on the subdivision of edges with regard to the cartesian product and computed their Wiener index. In this paper, we define a new class of sums called $F_H$ sums and compute the Wiener index of the resulting graph in terms of the Wiener indices of the component graphs so that the results in \cite{Eli} becomes a particular case of the Wiener index of $F_H$ sums for $H = K_1$, the complete graph on a single vertex.

Innovative technologies for processing tungsten containing tails of the enrichment factory of Zhambyl

2020 ◽  
pp. 443-452
Author(s):  
A. S. Shevchenko ◽  
Yu. P. Morozov ◽  
M. R. Shautenov ◽  
I. H. Hamidulin
Keyword(s):  
Raw Materials ◽  
Chemical Properties ◽  
Innovative Technology ◽  
Centrifugal Separation ◽  
Current State ◽  
Industrial Implementation ◽  
Electrochemical Chlorination ◽  
Physical And Chemical ◽  
Goals And Objectives ◽  
And Chemical Properties

Achievements and current state of technology for processing of technogenic materials have been assessed. The goals and objectives of the research have been defined. New laboratory apparatuses for processing mineral raw materials have been developed and manufactured. Laboratory and experimental industrial research of methods of circulation concentration, flotation classification, electrochemical chlorination, turbulization centrifugal separation have been carried out. The methods efficiency was assessed. The results of study of physical and chemical properties and distribution of metals by size classes of tungsten containing tailings are given. Studies of tailings enrichment by gravity, flotation and electrochemical enrichment methods are carried out. It is shown that for preliminary processing it is rational to use the method of circulation concentration. The methods of flotation classification, molybdenum flotation of a collective concentrate, electrochemical leaching of copper from a concentrate from flotation classification, turbulization centrifugal separation of products of tin flotation have been investigated. The innovative technology has been developed for processing complex tungsten containing tailings, based on research on a sample of tungsten containing tailings in the Zhambyl enrichment plant of the Kara-Oba deposit. This technology opens wide opportunities for processing of technogenic products and is offered for industrial implementation.

Investigation and prevention of the residues formed in melting furnaces and transfer ladles used in low-pressure Al-casting technologies

2016 ◽  
Vol 78 (1) ◽  
pp. 5-10
Author(s):  
B. Yay ◽  
E. Akinci ◽  
A. Güneren ◽  
U. Karaali ◽  
H.E. Çubuklusu ◽  
...  
Keyword(s):  
Corrosion Behaviour ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Alloy Wheel ◽  
Refractory Life ◽  
Economical Aspect ◽  
Joint Study ◽  
Physical And Chemical ◽  
Metallurgical Processes ◽  
And Chemical Properties

Purpose: Refractory life, in Al-casting processes such as alloy wheel production, is obviously affected by the inclusions formed in the transfer ladles and holding/melting furnaces in which melting, fluxing and degassing operations are carried out. The short refractory life affects, adversely, the economical aspect of the process. Therefore, a study on the physical and chemical properties of the above mentioned inclusions has been started. The main purpose of the study is to understand the relationships among the metallurgical processes taking place during casting, properties of the refractories used and the formation of inclusions.Design/methodology/approach: During this industry-university joint study, experimental studies using scanning electron microscopy (SEM), X-ray diffractometry (XRD) and optical microscopy were used to investigate the nature and properties of the inclusions. Also, corrosion behaviour of six different refractories was investigated by exposing them to molten aluminium.

scholarly journals Preparation of Graphene Materials and Their Applications in the Field of Electrochemistry

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Qing Liao ◽  
Tingting Song
Keyword(s):  
Electrochemical Method ◽  
Carbon Nanomaterials ◽  
Preparation Method ◽  
Chemical Properties ◽  
Modern Society ◽  
Physical And Chemical Properties ◽  
New Materials ◽  
New Type ◽  
Physical And Chemical ◽  
And Chemical Properties

In the development of modern society, many new materials and technologies have been integrated into the development of various industries. As a new type of two-dimensional carbon nanomaterials, graphene has great advantages in physical and chemical properties and is widely used in various fields of development. Among them, the electrochemical method is one of the important ways to prepare graphene materials, which has the characteristics of quickness and environmental protection, and can effectively produce a large amount of high-quality graphene and its composite materials. Based on this, the paper introduces the preparation method of graphene materials and studies the application of graphene materials in the field of electrochemistry.

Sign in / Sign up

Export Citation Format

Share Document