Graphene/graphene nanoplatelets reinforced polyamide nanocomposites: A review

2021 ◽  
pp. 095400832110112
Author(s):  
Himanshu V Madhad ◽  
Nikita S Mishra ◽  
Sunil B Patel ◽  
Siddhi S Panchal ◽  
Rusvi A Gandhi ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
3D Printing ◽  
Aspect Ratio ◽  
Large Scale ◽  
Low Cost ◽  
Academic Research ◽  
Graphene Nanoplatelets ◽  
High Electrical Conductivity ◽  
Multifunctional Nanocomposites ◽  
Preparation Techniques

Graphene and its derivatives have received considerable attention in industrial and academic research due to their unique, useful properties and applications. The use of graphene is still difficult due to its high cost of production. Hence, graphene nanoplatelets (GNPs) have been identified as a substitute for graphene, which are produced in large scale at a very low cost. Moreover, GNPs have played a significant role in various engineering thermoplastic materials [i.e., polyamides (PAs)] to enhance their properties and applications. The GNPs help in the production of low-cost multifunctional nanocomposites with notable useful properties such as high electrical conductivity, mechanical strength, and high aspect ratio. The GNPs based nanocomposites have a broad spectrum of application areas including 3D-printing, automotive materials, electrical appliances, low-cost composites films, and many more. This review summarizes different preparation techniques, properties, and applications of GNPs based PAs nanocomposites as reported in current literature.

scholarly journals Experimental Methods for Investigation of Drilling Fluid Displacement in Irregular Annuli

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5201
Author(s):  
Bjørnar Lund ◽  
Ali Taghipour ◽  
Jan David Ytrehus ◽  
Arild Saasen
Keyword(s):  
Electrical Conductivity ◽  
Large Scale ◽  
Drilling Fluid ◽  
Low Cost ◽  
Relevant Information ◽  
Experimental Methods ◽  
Optical Measurements ◽  
Complex Flow ◽  
Large Scale Systems ◽  
Fluid Displacement

Experimental methods are still indispensable for fluid mechanics research, despite advancements in the modelling and computer simulation field. Experimental data are vital for validating simulations of complex flow systems. However, measuring the flow in industrially relevant systems can be difficult for several reasons. Here we address flow measurement challenges related to cementing of oil wells, where main experimental issues are related to opacity of the fluids and the sheer size of the system. The main objective is to track the propagation of a fluid-fluid interface during a two-fluid displacement process, and thereby to characterize the efficiency of the displacement process. We describe the implementation and use of an array of electrical conductivity probes, and demonstrate with examples how the signals can be used to recover relevant information about the displacement process. To our knowledge this is the most extensive use of this measurement method for studying displacement in a large-scale laboratory setup. Optical measurements and visual observations are challenging and/or costly in such large-scale systems, but can still provide qualitative information as shown in this article. Using electrical conductivity probes is a robust and fairly low-cost experimental method for characterizing fluid-fluid displacement in large-scale systems.

Tungsten Disulfide Nanodispersions for Inkjet Printing and Semiconducting Devices

MRS Advances ◽  
2017 ◽  
Vol 2 (60) ◽  
pp. 3691-3696 ◽  
Author(s):  
Jay A. Desai ◽  
Nirmal Adhikari ◽  
Anupama B. Kaul
Keyword(s):  
Electrical Conductivity ◽  
Surface Morphology ◽  
Inkjet Printing ◽  
Electrical Transport ◽  
Large Scale ◽  
High Electrical Conductivity ◽  
Absorbance Spectrum ◽  
Electrical Transport Properties ◽  
Optical Absorbance ◽  
Device Applications

ABSTRACTIn this work, we demonstrate optical and electrical transport properties of chemically exfoliated WS2 in cyclohexanone/ terpineol solvent using different sonication times. High electrical conductivity of WS2 nanodispersions was observed when appropriate amount of voltage was applied indicating their semi-conductive behavior. Surface morphology of WS2 nanodispersions sonicated at different times were studied using optical microscopy. Optical bandgap of WS2 nanodispersions were determined from optical absorbance spectrum. Inkjet printing was used to demonstrate uniform distribution of WS2 nanosheets and their precise and large scale printability. These dispersions indicate the potential of WS2 in various optoelectronic and semiconducting device applications.

Ni–Co hydroxide nanosheets on plasma-reduced Co-based metal–organic nanocages for electrocatalytic water oxidation

2019 ◽  
Vol 7 (9) ◽  
pp. 4950-4959 ◽  
Author(s):  
Wenxia Chen ◽  
Yiwei Zhang ◽  
Rong Huang ◽  
Yuming Zhou ◽  
Yangjin Wu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Oxygen Evolution ◽  
Chemical Stability ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Low Cost ◽  
High Electrical Conductivity ◽  
Formidable Challenge ◽  
Metal Organic ◽  
Energy Conversion Devices

Development of highly efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) with high electrical conductivity and chemical stability is critical for various energy conversion devices and systems, yet still remains a formidable challenge.

Large-scale preparation of needle-like zinc oxide with high electrical conductivity

2006 ◽  
Vol 60 (25-26) ◽  
pp. 3133-3136 ◽  
Author(s):  
Shangfeng Du ◽  
Yajun Tian ◽  
Jian Liu ◽  
Haidi Liu ◽  
Yunfa Chen
Keyword(s):  
Electrical Conductivity ◽  
Zinc Oxide ◽  
Large Scale ◽  
High Electrical Conductivity ◽  
Large Scale Preparation ◽  
Scale Preparation

scholarly journals Multifunctional SENSING using 3D printed CNTs/BaTiO3/PVDF nanocomposites

2018 ◽  
Vol 53 (10) ◽  
pp. 1319-1328 ◽  
Author(s):  
Hoejin Kim ◽  
Bethany R Wilburn ◽  
Edison Castro ◽  
Carlos A Garcia Rosales ◽  
Luis A Chavez ◽  
...  
Keyword(s):  
Dielectric Property ◽  
3D Printing ◽  
Large Scale ◽  
Fused Deposition Modeling ◽  
Vinylidene Fluoride ◽  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Strain Sensing ◽  
3D Print ◽  
Fused Deposition

This research studied multifunctional sensing capabilities on nanocomposites composed of poly(vinylidene) fluoride (PVDF), BaTiO3 (BT), and multiwall carbon nanotubes (CNTs) fabricated by fused-deposition modeling 3D printing. To improve the dielectric property within BT/PVDF composites, CNTs have been utilized to promote ultrahigh polarization density and local micro-capacitor among BT and polymer matrix. The 3D printing process provides homogeneous dispersion of nanoparticles, alleviating agglomeration of nanoparticles, and reducing micro-crack/voids in matrix which can enhance their dielectric property. In this research, we demonstrated that by utilizing unique advantages of this material combination and a 3D printing technique, sensing capabilities for temperature and strain can be engineered with different content variations of included BT and CNTs. It is observed that the sensing capability for temperature change with respect to a 25–150℃ range can be improved as both BT and CNTs’ inclusions increase and is maximal with 1.7 wt.% CNTs/60 wt.% BT/PVDF nanocomposites, while the sensing capability for strain change in a 0–20% range is maximal with 1 wt.% CNTs/12 wt.% BT/PVDF nanocomposites. In addition, it is found that the best combination for mechanical toughness is 1 wt.% CNTs/12 wt.% BT/PVDF with 24.2 MPa and 579% in ultimate tensile strength and failure strain, respectively. These results show the technique to 3D print multifunctional nanocomposites with temperature and strain sensing capabilities as well as increased mechanical property. Furthermore, this research demonstrated the feasibility for large-scale multifunctional sensor device manufacturing with freedom of design, low-cost, and an accelerated process.

Transformation of VLF data into apparent resistivities and phases

Geophysics ◽  
1999 ◽  
Vol 64 (5) ◽  
pp. 1393-1402 ◽  
Author(s):  
Mehran Gharibi ◽  
Laust B. Pedersen
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Large Scale ◽  
Low Cost ◽  
Real Data ◽  
Geological Structure ◽  
Direct Estimate ◽  
Horizontal Magnetic Field ◽  
Near Surface ◽  
Full Solution

In the VLF method, the ratio between the vertical and the horizontal magnetic field or the total magnetic field anomaly is measured to detect localized changes in electrical conductivity contrasts. Although the VLF technique has probably been the most popular electromagnetic (EM) tool for mapping near‐surface geological structures in a large scale for the past few decades because of the low cost and speed with which surveys can be carried out, the measurements themselves do not give a direct estimate of electrical conductivity. A fast iterative method has been developed to estimate the impedance or apparent resistivity and phases from measurements of the magnetic components at the surface of a 2-D geological structure. From Maxwell’s equations in E-polarization, a relation was derived between the horizontal and vertical components of the magnetic field. A full solution has been obtained by making use of the fact that the secondary horizontal and vertical magnetic fields are of internal origin and form a Hilbert transform pair. Synthetic and real VLF data have been used to evaluate the performance and limitation of the method. Using synthetic and real data, one can achieve a full recovery of the E-polarization impedance as long as the length of the profile is sufficiently long. A number of precautions must be taken to ensure reliable estimation of impedance results.

Fabrication High Aspect Ratio Nanometer Holes on the Alumina Based on Self-Organization Technology

2014 ◽  
Vol 472 ◽  
pp. 725-728
Author(s):  
Yi Gui Li ◽  
Ling Han Li ◽  
Susumu Sugiyama ◽  
Jing Quan Liu
Keyword(s):  
Aspect Ratio ◽  
Wavelength Range ◽  
High Aspect Ratio ◽  
Large Scale ◽  
High Efficiency ◽  
Low Cost ◽  
Optical Parameter ◽  
Self Organization ◽  
Optical Elements ◽  
Guided Mode

In this paper, a nanofabrication technology of alumina self-organization method for deep and self-arranged nanometer holes on high purity aluminum is presented. Deep and self-arranged nanometer holes can be used as antireflection structures, polarizing elements, guided-mode resonance filters and high efficiency diffraction optical elements. The fabrication technology provided an effective method for low-cost, large-scale manufacturing high aspect ratio nanoholes.The deep nanoholes structure is fabricated by two anodizing processes on aluminum. The theoretical calculation of reflectivity for the fabricated deep holes G-solver sofeware while the measurement setup for the reflectivity of the deep nanoholes is self-made optical parameter test system.The results show that the calculated reflectivity of the deep holes is below 8.0% within the visible wavelength range, while the measured reflectivity of the fabricated nanometer holes is under 8.30% within the wavelength range of 400-760nm and it agrees well with the theoretical analysis result.

FeP3 monolayer as a high-efficiency catalyst for hydrogen evolution reaction

2019 ◽  
Vol 7 (44) ◽  
pp. 25665-25671 ◽  
Author(s):  
Shuang Zheng ◽  
Tong Yu ◽  
Jianyan Lin ◽  
Huan Lou ◽  
Haiyang Xu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
High Efficiency ◽  
Low Cost ◽  
High Electrical Conductivity

An urgent and key problem in hydrogen evolution reaction (HER) is to prepare low-cost catalysts with activity comparable to that of platinum (Pt), an intrinsic large number of active sites, and high electrical conductivity.

scholarly journals A New 3D Printing System of Poly(3,4-ethylenedioxythiophene) for Realizing a High Electrical Conductivity and Fine Processing Resolution

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1120
Author(s):  
Katsumi Yamada ◽  
Junji Sone
Keyword(s):  
Electrical Conductivity ◽  
3D Printing ◽  
Light Source ◽  
Mixed State ◽  
Pulsed Laser ◽  
Objective Lens ◽  
High Electrical Conductivity ◽  
Oil Immersion ◽  
Printing System ◽  
Micro Structures

Micro-nano 3D printing of the conductive 3,4-ethylenedioxythiophene polymer (PEDOT) was performed in this study. An oil immersion objective lens was introduced into the 3D photofabrication system using a femtosecond pulsed laser as the light source. As a result, the processing resolution in the horizontal and vertical directions was improved in comparison to our previous study. A relatively high electrical conductivity (3500 S/cm) was found from the obtained 3D PEDOT micro-structures. It is noteworthy that the high conductivity of the PEDOT was obtained in the mixed state with an insulating Nafion sheet.

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