scholarly journals Biaxial Stretching of Polymer Nanocomposites: A Mini-Review

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiaoyu Chen ◽  
Dong Xiang ◽  
Zuoxin Zhou ◽  
Yuanpeng Wu ◽  
Hui Li ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
High Performance ◽  
Chemical Properties ◽  
Deformation Mode ◽  
Future Research ◽  
Film Extrusion ◽  
Biaxial Stretching ◽  
High Performance Polymer ◽  
Packaging Industry ◽  
Physical And Chemical

Polymer nanocomposites with excellent physical and chemical properties and multifunctional performance have been widely used in various fields. Biaxial stretching is not only an advanced film manufacturing process, but also a deformation mode in other processing methods such as blow film extrusion and thermoforming. In recent research, high-performance polymer nanocomposites have been fabricated via sequential and simultaneous biaxial stretching. This fabrication method enhances the mechanical properties, optical performance, and thermal properties of polymer nanocomposites by changing the structure or orientation of materials during the process of stretching. Therefore, it is particularly suitable for use in optimizing material performance and preparing thin films with excellent properties in the packaging industry. With the emergence of new materials and technologies, polymer nanocomposites prepared by biaxial stretching have demonstrated multifunctional properties and their range of applications has further expanded. In this mini-review, the effect of biaxial stretching on the structure and properties of nanocomposites based on various nanofillers is discussed and applications are summarized. In addition, the challenges and future prospects of this technology are analyzed. The presented work will be beneficial for improving preparation processes and improving future research for the production of high-performance polymer nanocomposites.

scholarly journals Minimization of the Thermal Impact in the Laser Welding of Dissimilar Stainless Steels

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 650 ◽  
Author(s):  
Francisco Cordovilla ◽  
Alejandro Tur ◽  
Ángel García-Beltrán ◽  
Marcos Diaz ◽  
Ignacio Angulo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Laser Welding ◽  
Stainless Steels ◽  
High Performance ◽  
Chemical Properties ◽  
Laser Pulses ◽  
Passive Layer ◽  
Thermal Impact ◽  
Welding Regime ◽  
Physical And Chemical

Laser welding of dissimilar stainless steels is of interest when mechanical, corrosion, or esthetical requirements impose the use of a high-performance stainless steels, while production-cost requirements prevent using expensive materials in all the parts of a given device. The compromise may lead to the use of the most expensive material in critical areas and the cheapest one in the remaining. Their union can be materialized by laser-pulsed welding. It has intrinsic difficulties derived from the different physical and chemical properties of the steels, and from the need of preserving the protective passive layer. The present work achieves a welded joint with minimum thermal impact by means of laser pulses, capable of preserving the corrosion resistance of the involved stainless steels. The influence of the parameters to define static and dynamic pulses on the material and on the welding regime, keyhole, or heat conduction, is studied. It is used to calculate the overlapping factor of the pulses on the basis of the real dimensions of the melted area. A continuous joint has been built with dynamic pulses. The corrosion resistance of it has been checked showing a similar behavior to the non-heated material. The microstructure of the optimized joint is associated with a reduced HAZ while its mechanical behavior is suitable for its real application.

scholarly journals Tribology of 2D Nanomaterials: A Review

2020 ◽  
Author(s):  
Paul С. Uzoma ◽  
Huan Hu ◽  
Mahdi Khadem ◽  
Oleksiy V. Penkov
Keyword(s):  
High Performance ◽  
2D Materials ◽  
Chemical Properties ◽  
Solid Lubricants ◽  
Friction Behavior ◽  
Comprehensive Overview ◽  
Wear Rates ◽  
Recent Developments ◽  
Frictional Coefficients ◽  
Physical And Chemical

The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN, and Black Phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear, and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

Designing high performance polymer nanocomposites by incorporating robustness-controlled polymeric nanoparticles: insights from molecular dynamics

2022 ◽  
Author(s):  
Guangyi Hou ◽  
Sai Li ◽  
Jun Liu ◽  
Yun-Xuan Weng ◽  
Liqun Zhang
Keyword(s):  
Molecular Dynamics ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Polymeric Nanoparticles ◽  
Polymer Nanoparticles ◽  
Polymer Matrices ◽  
Interesting Topic ◽  
High Performance Polymer

Introducing polymer nanoparticles into polymer matrices is an interesting topic, and the robustness of polymeric nanoparticles is very crucial for the properties of polymer nanocomposites (PNCs). In this study, by...

Air

2020 ◽  
pp. 139-177
Author(s):  
John Evans
Keyword(s):  
Carbon Capture ◽  
High Performance ◽  
Internal Combustion Engines ◽  
Atmospheric Oxygen ◽  
Carbon Capture And Storage ◽  
Chemical Properties ◽  
Energy Capture ◽  
Physical And Chemical ◽  
And Storage

The chemical properties of the volatile elements in groups 15 to 18 are outlined, showing how the the periodicicty of the properties of the elements shapes their chemistry. The manufacture of hydrogen and chlorine is described, showing how mercury-free methods have been developed for the latter. The effect of the formation of atmospheric CO2 on atmospheric oxygen content is explained in terms of dissolution in the oceans. Remediation of the exhaust gases from internal combustion engines by catalysts to remove CO2, NOx and carbonaceous particulates is explained. Options for carbon capture and storage by physical and chemical processes are evaluated, and examples provided of these processes in operation. Exploitation of the atmosphere for energy capture using wind turbines has been aided by the development of high performance magnets. The basis of these magnets and the role of rare earth elements is explained.

scholarly journals Tribology of 2D Nanomaterials: A Review

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 897
Author(s):  
Paul C. Uzoma ◽  
Huan Hu ◽  
Mahdi Khadem ◽  
Oleksiy V. Penkov
Keyword(s):  
High Performance ◽  
2D Materials ◽  
Chemical Properties ◽  
Solid Lubricants ◽  
Friction Behavior ◽  
Comprehensive Overview ◽  
Wear Rates ◽  
Recent Developments ◽  
Frictional Coefficients ◽  
Physical And Chemical

The exfoliation of graphene has opened a new frontier in material science with a focus on 2D materials. The unique thermal, physical and chemical properties of these materials have made them one of the choicest candidates in novel mechanical and nano-electronic devices. Notably, 2D materials such as graphene, MoS2, WS2, h-BN and black phosphorus have shown outstanding lowest frictional coefficients and wear rates, making them attractive materials for high-performance nano-lubricants and lubricating applications. The objective of this work is to provide a comprehensive overview of the most recent developments in the tribological potentials of 2D materials. At first, the essential physical, wear and frictional characteristics of the 2D materials including their production techniques are discussed. Subsequently, the experimental explorations and theoretical simulations of the most common 2D materials are reviewed in regards to their tribological applications such as their use as solid lubricants and surface lubricant nano-additives. The effects of micro/nano textures on friction behavior are also reviewed. Finally, the current challenges in tribological applications of 2D materials and their prospects are discussed.

scholarly journals Identifying Potential Leakage Zones in an Irrigation Supply Channel by Mapping Soil Properties Using Electromagnetic Induction, Inversion Modelling and a Support Vector Machine

Soil Systems ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 25
Author(s):  
Ehsan Zare ◽  
Nan Li ◽  
Tibet Khongnawang ◽  
Mohammad Farzamian ◽  
John Triantafilis
Keyword(s):  
Electrical Conductivity ◽  
Support Vector Machine ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Future Research ◽  
Support Vector ◽  
Stream Channels ◽  
Supply Channel ◽  
Physical And Chemical ◽  
And Chemical Properties

The clay alluvial plains of Namoi Valley have been intensively developed for irrigation. A condition of a license is water needs to be stored on the farm. However, the clay plain was developed from prior stream channels characterised by sandy clay loam textures that are permeable. Cheap methods of soil physical and chemical characterisations are required to map the supply channels used to move water on farms. Herein, we collect apparent electrical conductivity (ECa) from a DUALEM-421 along a 4-km section of a supply channel. We invert ECa to generate electromagnetic conductivity images (EMCI) using EM4Soil software and evaluate two-dimensional models of estimates of true electrical conductivity (σ—mS m−1) against physical (i.e., clay and sand—%) and chemical properties (i.e., electrical conductivity of saturated soil paste extract (ECe—dS m−1) and the cation exchange capacity (CEC, cmol(+) kg−1). Using a support vector machine (SVM), we predict these properties from the σ and depth. Leave-one-site-out cross-validation shows strong 1:1 agreement (Lin’s) between the σ and clay (0.85), sand (0.81), ECe (0.86) and CEC (0.83). Our interpretation of predicted properties suggests the approach can identify leakage areas (i.e., prior stream channels). We suggest that, with this calibration, the approach can be used to predict soil physical and chemical properties beneath supply channels across the rest of the valley. Future research should also explore whether similar calibrations can be developed to enable characterisations in other cotton-growing areas of Australia.

Functionalization of polyethetherketone for application in dentistry and orthopedics

2017 ◽  
Vol 18 (1-2) ◽  
Author(s):  
Rico Harting ◽  
Marius Barth ◽  
Thomas Bührke ◽  
Regina Sophia Pfefferle ◽  
Svea Petersen
Keyword(s):  
Drug Delivery ◽  
Surface Modification ◽  
High Performance ◽  
Drug Delivery Systems ◽  
Metal Implant ◽  
High Performance Polymer ◽  
Potential Applications ◽  
Physical And Chemical ◽  
Very High ◽  
Huge Challenge

AbstractSince late 1990s, polyetheretherketone (PEEK) has presented a promising polymeric alternative to metal implant components, particularly in orthopedic and traumatic applications. However, PEEK is biologically inert, which has constrained its potential applications. In this manner, enhancing the bioactivity of PEEK is a huge challenge that must be comprehended to completely understand the potential advantages. Up to now, two noteworthy methodologies are discussed to enhance the bioactivity of PEEK, including bulk and surface modification. Although the latter is extremely challenging due to the very high physical and chemical stability of the high performance polymer, there are some stated modification reactions in the literature, which will be collocated with in the literature-reported PEEK composites in the present article. We will furthermore add information on polymer-based drug delivery systems and the biofunctionalization of polymers in general and discuss their applicability for PEEK, as we estimate that these strategies will gain greater attention in the future. At the end of the article, our own research on the development of a PEEK-associated biodegradable drug-delivery system with potential application in dentistry or orthopedics will be highlighted.

From carbon nanotube coatings to high-performance polymer nanocomposites

2008 ◽  
Vol 57 (4) ◽  
pp. 547-553 ◽  
Author(s):  
Stéphane Bredeau ◽  
Sophie Peeterbroeck ◽  
Daniel Bonduel ◽  
Michaël Alexandre ◽  
Philippe Dubois
Keyword(s):  
Carbon Nanotube ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
High Performance Polymer

scholarly journals Carbonaceous Nanomaterials Employed in the Development of Electrochemical Sensors Based on Screen-Printing Technique—A Review

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 680 ◽  
Author(s):  
Alexandra Virginia Bounegru ◽  
Constantin Apetrei
Keyword(s):  
High Performance ◽  
Screen Printing ◽  
Electrochemical Sensors ◽  
Chemical Properties ◽  
Structural Features ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Carbon Based Nanomaterials ◽  
Physical And Chemical ◽  
Carbon Based

This paper aims to revise research on carbonaceous nanomaterials used in developing sensors. In general, nanomaterials are known to be useful in developing high-performance sensors due to their unique physical and chemical properties. Thus, descriptions were made for various structural features, properties, and manner of functionalization of carbon-based nanomaterials used in electrochemical sensors. Of the commonly used technologies in manufacturing electrochemical sensors, the screen-printing technique was described, highlighting the advantages of this type of device. In addition, an analysis was performed in point of the various applications of carbon-based nanomaterial sensors to detect analytes of interest in different sample types.

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