Capacitor Strain Sensor for Enhancing Feedback to Patients Recovering From a Stroke

2020 ◽  
Author(s):  
Phil Denen ◽  
Matthew Colachis ◽  
Amy M. Heintz ◽  
Krenar Shqau ◽  
Andrew Sweeney ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Single Wall Carbon Nanotubes ◽  
Novel Material ◽  
Strain Sensor Array ◽  
Capacitive Strain ◽  
High Dielectric

Abstract Embedded sensors in footwear are of interest for providing feedback on mobility and gait. The most sensitive location is within the sole, requiring development of new materials that have the required functional and mechanical properties. We are developing capacitive strain sensors. The performance of such sensorsis dictated by two fundamental materials properties: dielectric constant (ε) and hardness. The sensitivity is improved by a high dielectric constant and low hardness. This paper describes a novel material that combines a composite elastomeric polymer and single wall carbon nanotubes (SWCNTs). The optimum SWCNT loading in a polyurethane with 80A shore hardness was determined to be 0.1 vol% which delivered a high SNR and maintained its mechanical properties (hardness). Data collected from a shoe strain sensor array of this material can be used for automatic recognition of postures and activities, for characterization of extremity use, and to provide behavioral enhancing feedback to patients recovering from a stroke.

Design and characterization of a single channel two-liquid capacitor and its application to hyperelastic strain sensing

Lab on a Chip ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 1376-1384 ◽  
Author(s):  
Shanliangzi Liu ◽  
Xiaoda Sun ◽  
Owen J. Hildreth ◽  
Konrad Rykaczewski
Keyword(s):  
Dielectric Constant ◽  
Liquid Metal ◽  
High Dielectric Constant ◽  
Single Channel ◽  
Strain Sensor ◽  
Strain Sensing ◽  
Metal Electrodes ◽  
Capacitive Strain ◽  
High Dielectric

We show that single channel capacitive strain sensor consisting of a high dielectric constant liquid sandwiched in-between two liquid metal electrodes can have 25 times higher capacitance per sensor's base area when compared to current two-channel liquid metal stain sensors.

scholarly journals A Novel Textile Stitch-Based Strain Sensor for Wearable End Users

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1469 ◽  
Author(s):  
Orathai Tangsirinaruenart ◽  
George Stylios
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistance ◽  
Body Movement ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Heart Monitoring ◽  
Textile Sensors ◽  
Good Repeatability ◽  
The Ideal

This research presents an investigation of novel textile-based strain sensors and evaluates their performance. The electrical resistance and mechanical properties of seven different textile sensors were measured. The sensors are made up of a conductive thread, composed of silver plated nylon 117/17 2-ply, 33 tex and 234/34 4-ply, 92 tex and formed in different stitch structures (304, 406, 506, 605), and sewn directly onto a knit fabric substrate (4.44 tex/2 ply, with 2.22, 4.44 and 7.78 tex spandex and 7.78 tex/2 ply, with 2.22 and 4.44 tex spandex). Analysis of the effects of elongation with respect to resistance indicated the ideal configuration for electrical properties, especially electrical sensitivity and repeatability. The optimum linear working range of the sensor with minimal hysteresis was found, and the sensor’s gauge factor indicated that the sensitivity of the sensor varied significantly with repeating cycles. The electrical resistance of the various stitch structures changed significantly, while the amount of drift remained negligible. Stitch 304 2-ply was found to be the most suitable for strain movement. This sensor has a wide working range, well past 50%, and linearity (R2 is 0.984), low hysteresis (6.25% ΔR), good gauge factor (1.61), and baseline resistance (125 Ω), as well as good repeatability (drift in R2 is −0.0073). The stitch-based sensor developed in this research is expected to find applications in garments as wearables for physiological wellbeing monitoring such as body movement, heart monitoring, and limb articulation measurement.

scholarly journals Improved electromechanical properties of brominated butyl rubber filled with modified barium titanate

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37148-37157 ◽  
Author(s):  
Mengnan Ruan ◽  
Dan Yang ◽  
Wenli Guo ◽  
Shuo Huang ◽  
Yibo Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Barium Titanate ◽  
High Dielectric Constant ◽  
Dielectric Elastomer ◽  
Butyl Rubber ◽  
Electromechanical Properties ◽  
Brominated Butyl Rubber ◽  
High Dielectric

Barium titanate (BT) particles, BT-KH570 particles, and polar plasticizer tri-n-butyl phosphate (TBP) were added into BIIR matrix to form a dielectric elastomer composite, which had a high dielectric constant, good mechanical properties, and large actuated strain.

Optical properties and band gap characterization of high dielectric constant oxides

2012 ◽  
Vol 520 (14) ◽  
pp. 4532-4535 ◽  
Author(s):  
O. Fursenko ◽  
J. Bauer ◽  
G. Lupina ◽  
P. Dudek ◽  
M. Lukosius ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Band Gap ◽  
High Dielectric Constant ◽  
High Dielectric

Characterization of the Aniline.DBSA/Thermoplastic Polyurethane Blends for the Thermo-Mechanical and Electro-Mechanical Properties

2021 ◽  
Vol 875 ◽  
pp. 96-103
Author(s):  
Ayesha Afzal ◽  
Iqra Abdul Rashid ◽  
H.M. Faizan Shakir ◽  
Asra Tariq
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Strain Sensors ◽  
Sem Images ◽  
Dynamic Mechanical Thermal Analyzer ◽  
Thermal Analyzer ◽  
Uniform Dispersion ◽  
Polymerization Method

Conducting polymer blends Polyaniline-Dodecylbenzene sulfonic acid (Pani.DBSA) and thermoplastic polyurethane (TPU) were prepared using in-situ emulsion polymerization method by dissolving both components in DMF. Ani.DBSA/TPU blends were prepared with different compositions 20/80, 30/70, 40/60 and 50/50 wt%. Theses blends have good conducting and mechanical properties. Blends were characterized by Potentiostate, Thermogravimetric analysis (TGA), Infrared spectroscopy (FTIR) and Dynamic mechanical thermal analyzer (DMTA). The electrical conductivity increases up to 30 wt% loading of aniline.DBSA after that it decreases gradually. The uniform dispersion of aniline.DBSA showed in SEM images which is the indication of a strong connection between aniline.DBSA and TPU which increase the conductivity. These blends can be used as strain sensors.

Pulsed DC Magnetron Sputtered Rutile TiO2 films for next generation DRAM capacitors

2013 ◽  
Vol 1561 ◽  
Author(s):  
M.A Jithin ◽  
Lakshmi Ganapathi Kolla ◽  
Navakanta Bhat ◽  
S. Mohan ◽  
Yuichiro Morozumi ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Low Dielectric Constant ◽  
Si Substrate ◽  
Capacitance Density ◽  
Low Dielectric ◽  
Pulsed Dc ◽  
High Dielectric ◽  
Mim Capacitors

ABSTRACTIn this study, synthesis and characterization of rutile-Titanium dioxide (TiO2) thin films using pulsed DC Magnetron Sputtering at room temperature, along with the fabrication and characterization of MIM capacitors have been discussed. XPS and RBS data show that the films are stoichiometric and have compositional uniformity. The influence of electrode materials on electrical characteristics of the fabricated MIM capacitors has been studied. The Al/TiO2/Al based capacitors show low capacitance density (9 fF/μm2) with low dielectric constant (K=25) and high EOT (3.67 nm) due to low dielectric constant TiO2 phase formation on Al/Si substrate. On the other hand, Ru/TiO2/Ru based capacitors show high capacitance density (49 fF/μm2) with high dielectric constant (K=130) and low EOT (0.7nm) values at high frequency (100 KHz) due to high dielectric constant phase (rutile) formation of TiO2, on Ru/Si substrate. Raman spectra confirm that the films deposited on Ru/Si substrate show the rutile phase.

scholarly journals Polymer-Based Self-Standing Flexible Strain Sensor

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Fernando Martinez ◽  
Gregorio Obieta ◽  
Ion Uribe ◽  
Tomasz Sikora ◽  
Estibalitz Ochoteco
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistance ◽  
Strain Sensor ◽  
Strain Sensors ◽  
Gauge Factor ◽  
Wearable Electronics ◽  
Rehabilitation Devices ◽  
Flexible Strain Sensor

The design and characterization of polymer-based self-standing flexible strain sensors are presented in this work. Properties as lightness and flexibility make them suitable for the measurement of strain in applications related with wearable electronics such as robotics or rehabilitation devices. Several sensors have been fabricated to analyze the influence of size and electrical conductivity on their behavior. Elongation and applied charge were precisely controlled in order to measure different parameters as electrical resistance, gauge factor (GF), hysteresis, and repeatability. The results clearly show the influence of size and electrical conductivity on the gauge factor, but it is also important to point out the necessity of controlling the hysteresis and repeatability of the response for precision-demanding applications.

Characterization of Nanoporous Low Dielectric Polysilsesquioxane Thin Films

2005 ◽  
Vol 277-279 ◽  
pp. 907-911
Author(s):  
Jingyu Hyeon Lee ◽  
Yi Yeol Lyu ◽  
Mong Sup Lee ◽  
Jin Heong Yim ◽  
Sang Youl Kim
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Elastic Modulus ◽  
Polymer Matrix ◽  
Low Dielectric

Poly(methyl-co-cyclosiloxane bearing silsesquioxane)s (P(M-co-CSSQs)) were prepared. Using poly(e-caprolactone) (PCL) as a template, PCL / P(M-co-CSSQ) nanohybrid films were fabricated. The electrical, morphological, and mechanical properties of the PCL / P(M-co-CSSQ) films were investigated. The dielectric constant of a cured PCL / P(M-co-CSSQ) film at 420°C scaled down from 2.55 to 2.05 and refractive index from 1.41 to 1.33 when 20 vol. % of the PCL was admixed with the polymer matrix. The elastic modulus and hardness of the cured PCL / P(Mco- CSSQ) (2:8, vol./vol.) film were 2.50 and 0.32 GPa, respectively, showing dependency on the PCL content.

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