Electromagnetic properties and performance of exfoliated graphite (EG) – Thermoplastic polyurethane (TPU) nanocomposites at microwaves

2015 ◽  
Vol 114 ◽  
pp. 26-33 ◽  
Author(s):  
M. Valentini ◽  
F. Piana ◽  
J. Pionteck ◽  
F.R. Lamastra ◽  
F. Nanni
Keyword(s):  
Thermoplastic Polyurethane ◽  
Exfoliated Graphite ◽  
Electromagnetic Properties ◽  
And Performance

scholarly journals Effects of 3D Printing-Line Directions for Stretchable Sensor Performances

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1791
Author(s):  
Chi Cuong Vu ◽  
Thanh Tai Nguyen ◽  
Sangun Kim ◽  
Jooyong Kim
Keyword(s):  
3D Printing ◽  
Thermoplastic Polyurethane ◽  
Three Dimensional ◽  
Optimal Solution ◽  
Human Motion ◽  
Repeated Measurements ◽  
Fused Filament Fabrication ◽  
And Performance ◽  
The Times ◽  
Stretchable Sensors

Health monitoring sensors that are attached to clothing are a new trend of the times, especially stretchable sensors for human motion measurements or biological markers. However, price, durability, and performance always are major problems to be addressed and three-dimensional (3D) printing combined with conductive flexible materials (thermoplastic polyurethane) can be an optimal solution. Herein, we evaluate the effects of 3D printing-line directions (45°, 90°, 180°) on the sensor performances. Using fused filament fabrication (FDM) technology, the sensors are created with different print styles for specific purposes. We also discuss some main issues of the stretch sensors from Carbon Nanotube/Thermoplastic Polyurethane (CNT/TPU) and FDM. Our sensor achieves outstanding stability (10,000 cycles) and reliability, which are verified through repeated measurements. Its capability is demonstrated in a real application when detecting finger motion by a sensor-integrated into gloves. This paper is expected to bring contribution to the development of flexible conductive materials—based on 3D printing.

Structure and performance control of high‐damping bio‐based thermoplastic polyurethane

2021 ◽  
pp. 52059
Author(s):  
Xi Hou ◽  
Liwen Sun ◽  
Wei Wei ◽  
Darlene K. Taylor ◽  
Shengpei Su ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Performance Control ◽  
And Performance

A Novel Proximity Probe Unaffected by Shaft Electromagnetic Properties

1996 ◽  
Author(s):  
Michael M. Hastings ◽  
Henrik B. Jensen
Keyword(s):  
Electromagnetic Properties ◽  
Specific Probe ◽  
Specific Kind ◽  
Performance Expectations ◽  
Monitoring Reliability ◽  
Wide Range ◽  
Probe System ◽  
To Come ◽  
And Performance ◽  
Displacement Transducers

Non-contact eddy-current displacement transducers, or proximity probes as they are popularly known, have always played an important role in monitoring the condition of a variety of machines, and will remain doing so for years to come. Although immensely useful for detecting a wide range of machine faults by simply monitoring the shaft position and vibration, there are definite limitations to the traditional probe systems due to the aging technology. Some of these problems are the probe driver sensitivity to the probe coil parameters, the shaft’s electromagnetic properties, and the capacitance of the cable it is attached to. Since each probe driver has to be individually calibrated to a specific probe tip diameter, a specific kind of shaft material and a specific cable length, it is easy to imagine that stocking such dedicated drivers can be expensive for large applications. But what is even more costly than this is the risk of reduced monitoring reliability due to an incorrectly selected or calibrated driver. As a result of this, a new proximity probe system recently has been designed and tested that uses a simple yet innovative principle that makes it insensitive to shaft material electromagnetic properties, can accommodate different cable lengths without recalibration, and yet still can fulfil all the installation, application, and performance expectations of a traditional probe.

Influence of the incorporation of different chemically functionalized carbon nanotubes in polyurethane resin applied on aluminum

2019 ◽  
Vol 39 (8) ◽  
pp. 762-768 ◽  
Author(s):  
Gabriela Gobbi ◽  
Lilian Vanessa Rossa Beltrami ◽  
Ademir José Zattera
Keyword(s):  
Carbon Nanotubes ◽  
Thermoplastic Polyurethane ◽  
Salt Spray ◽  
Electromagnetic Properties ◽  
Aluminum Surface ◽  
Polyurethane Resin ◽  
Carboxylic Groups ◽  
Aa 7075 ◽  
Amine Groups ◽  
Electromagnetic Performance

Abstract Composites based on commercial thermoplastic polyurethane resin (PU) with three different types of carbon nanotubes (CNT), in 0.5% concentration, were prepared and applied on an AA 7075 aluminum surface. CNT unfunctionalized, CNT functionalized with carboxylic groups, and CNT functionalized with amine groups were tested. The composites were evaluated by optical microscopy, adhesion, impact strength, salt spray, and electrical conductivity. In addition, a wave-guide technique between 8.2 and 12.3 GHz was used to measure the electromagnetic properties of the composites. The results showed that the CNT functionalized with amine group (NH2) presented a good interaction of the PU resin, thus forming a level and uniform film. The analyses of adhesion, direct impact, and salt spray showed that all samples presented excellent performance. Although the samples presented a low electromagnetic performance, an emerging potential for electromagnetic shielding was noticed.

Oriented distribution structure, interaction, and performance of thermoplastic polyurethane/selective hindered amine hybrids

2010 ◽  
Vol 120 (2) ◽  
pp. 906-913 ◽  
Author(s):  
Xiuying Zhao ◽  
Daling Xiao ◽  
Sizhu Wu ◽  
Yiping Feng ◽  
Liqun Zhang ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Structure Interaction ◽  
Distribution Structure ◽  
And Performance

scholarly journals Designs and Performance Characteristics of Coated Nanotoroid Antennas

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Sami Ur Rehman ◽  
Junping Geng ◽  
Richard W. Ziolkowski ◽  
Ying Wang ◽  
Xianling Liang ◽  
...  
Keyword(s):  
Plane Wave ◽  
Resonance Frequency ◽  
Wave Scattering ◽  
Electromagnetic Properties ◽  
Purcell Factor ◽  
Active Core ◽  
Radiating Element ◽  
Plane Wave Scattering ◽  
And Performance ◽  
Strong Dipole

The electromagnetic properties of a toroidal coated nanoparticle (T-CNP) antenna with an active core (doped with rare earth erbium Er3+ions) are investigated. It is demonstrated that the active T-CNP acts as a strong dipole radiator at its resonance frequency when it is excited by a plane wave or an electric Hertzian dipole (EHD) radiating element. It is shown that in comparison to being a passive structure, the plane wave scattering cross section of the T-CNP can be increased by nearly 108 dBsm at its resonance frequency when it is active. Moreover, it is further demonstrated that the maximum peak of the power radiated by an EHD element in the presence of a properly designed active T-CNP is more than 120 dB over its value when radiating in free space; that is, its Purcell factor is 1012.

scholarly journals Thermoplastic polyurethane flexible capacitive proximity sensor reinforced by CNTs for applications in the creative industries

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Reza Moheimani ◽  
Nojan Aliahmad ◽  
Nahal Aliheidari ◽  
Mangilal Agarwal ◽  
Hamid Dalir
Keyword(s):  
Carbon Nanotubes ◽  
Thermoplastic Polyurethane ◽  
Creative Industries ◽  
Detection Accuracy ◽  
Sensing Element ◽  
Detection Distance ◽  
Proximity Sensor ◽  
Capacitance Effect ◽  
Wide Range ◽  
And Performance

AbstractWearable sensing platforms have been rapidly advanced over recent years, thanks to numerous achievements in a variety of sensor fabrication techniques. However, the development of a flexible proximity sensor that can perform in a large range of object mobility remains a challenge. Here, a polymer-based sensor that utilizes a nanostructure composite as the sensing element has been presented for forthcoming usage in healthcare and automotive applications. Thermoplastic Polyurethane (TPU)/Carbon Nanotubes (CNTs) composites are capable of detecting presence of an external object in a wide range of distance. The proximity sensor exhibits an unprecedented detection distance of 120 mm with a resolution of 0.3%/mm. The architecture and manufacturing procedures of TPU/CNTs sensor are straightforward and performance of the proximity sensor shows robustness to reproducibility as well as excellent electrical and mechanical flexibility under different bending radii and over hundreds of bending cycles with variation of 4.7% and 4.2%, respectively. Tunneling and fringing effects are addressed as the sensing mechanism to explain significant capacitance changes. Percolation threshold analysis of different TPU/CNT contents indicated that nanocomposites having 2 wt% carbon nanotubes are exhibiting excellent sensing capabilities to achieve maximum detection accuracy and least noise among others. Fringing capacitance effect of the structure has been systematically analyzed by ANSYS Maxwell (Ansoft) simulation, as the experiments precisely supports the sensitivity trend in simulation. Our results introduce a new mainstream platform to realize an ultrasensitive perception of objects, presenting a promising prototype for application in wearable proximity sensors for motion analysis and artificial electronic skin.

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