Elastomers for biomedical applications

Yoda, Ryuichiro

doi:10.1163/156856298x00046

Cited by 192 publications

(90 citation statements)

References 289 publications

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“…The upcoming section presents the background theory on the SEC, mix that would be chemically and mechanically robust over time and exposure to harsh environments. The 62 dielectric of the SEC is composed of an SEBS matrix, a block copolymer used in many medical applications 63 due to their purity, softness, elasticity, and strength (Yoda 1998), filled with titania, an inorganic particle 64 characterized by a high dielectric permittivity that increases the permittivity and durability of the polymer …”

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confidence: 99%

Dynamic Characterization of a Soft Elastomeric Capacitor for Structural Health Monitoring

et al. 2015

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Structural health monitoring of civil infrastructures is a difficult task, often impeded by the geometrical size of the monitored systems. Recent advances in conducting polymers enabled the fabrication of flexible sensors capable of covering large areas, a possible solution to the monitoring challenge of mesoscale systems. The authors have previously proposed a novel sensor consisting of a soft elastomeric capacitor (SEC) acting as a strain gauge. Arranged in a network configuration, the SECs have the potential to cover very large surfaces. In this paper, understanding of the proposed sensor is furthered by evaluating its performance at vibration-based monitoring of large-scale structures. The dynamic behavior of the SEC is characterized by subjecting the sensor to a frequency sweep, and detecting vibration modes of a full-scale steel beam. Results show that the sensor can be used to detect fundamental modes and dynamic input. Also, a network of SECs is used for output-only modal identification of a full-scale concrete beam, and results are benchmarked against off-theshelf accelerometers. The SEC network performs well at estimating both natural frequencies and mode shapes. The resolution of the sensor is currently limited by the available electronics to measure small changes in capacitance, which reduces its accuracy with increasing frequencies in both the time and frequency domain. The authors have previously proposed a novel sensor consisting of a soft elastomeric capacitor (SEC) acting 8 as a strain gauge. Arranged in a network configuration, the SECs have the potential to cover very large 9 surfaces. In this paper, we further the understanding of the proposed sensor by evaluating its performance at 12show that the sensor can be used to detect fundamental modes and dynamic input. Also, a network of

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confidence: 99%

Dynamic Characterization of a Soft Elastomeric Capacitor for Structural Health Monitoring

et al. 2015

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“…In particular, for nanocomposites fabricated with TiO2 [17] and BaTiO3 [22], researchers found that simple mixing rules applies and the experimental results matched the theoretical ones [15,16] [24]. At low levels, an increase in filler volume fraction leads to an increase in permittivity, but to a decrease in the breakdown strength by over 50%, resulting in a decrease in the electrostatic energy density [17].…”

Section: Introductionmentioning

confidence: 74%

“…In particular, SEBS is a soluble tri-BCP thermoplastic elastomer with a rubbery and semi-crystalline domain. It is used in many medical applications due to its purity, softness, elasticity, and strength [15]. The inorganic TiO2 particles (average size of 300nm) are characterized by a high anisotropic permittivity [16] of approximately 120 along the x axis.…”

Section: Introductionmentioning

confidence: 99%

Interfacial treatment effects on behavior of soft nano-composites for highly stretchable dielectrics

Saleem

Thunga

Kollosche

et al. 2014

Polymer

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We investigate the influence of interfacial treatment on the matrix-filler interaction using a melt mixing process to fabricate robust and highly stretchable dielectrics. Silicone oil and silane coupling agent are studied as possible solutions to enhance the compatibility between the inorganic fillers and polymer matrix. Morphology, thermomechanical and dielectric behavior of the prepared specimens are studied. Results show that specimens filled with silicone oil coated particles have promising dielectric and thermal properties. The mechanical properties reveal a stiffness enhancement by 67% with a high strain at break of 900%. The relative permittivity of the specimens prepared with silicone oil increased by 45% as observed from the dielectric analysis. KeywordsMaterials Science and Engineering, Dielectric materials, Permittivity, Surface treatment Disciplines Civil Engineering | Computer-Aided Engineering and Design | Construction Engineering and Management | Electrical and Computer Engineering | Electronic Devices and Semiconductor Manufacturing | Environmental EngineeringComments NOTICE: this is the author's versin of a work that was accepted for publication in Polymer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. a definitive version was subsequently published in Polymer, 55 (17) AbstractWe investigate the influence of interfacial treatment on the matrix-filler interaction using a meltmixing process to fabricate robust and highly stretchable dielectrics. Silicone oil and silane coupling agent are studied as possible solutions to enhance the compatibility between the inorganic fillers and polymer matrix. Morphology, thermomechanical and dielectric behavior of the prepared specimens are studied. Results show that specimens filled with silicone oil coated particles have promising dielectric and thermal properties. The mechanical properties reveal a stiffness enhancement by 67% with a high strain at break of 900 %. The relative permittivity of the specimens prepared with silicone oil increased by 45% as observed from the dielectric analysis.

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“…SEBS is a block copolymer widely used for medical applications, because of its purity, softness, elasticity, and strength [38]. Titania is an inorganic particle characterized by a high dielectric permittivity that increases the permittivity and durability of the SEBS matrix [39].…”

Section: Sensor Fabricationmentioning

confidence: 99%

Smart sensing skin for detection and localization of fatigue cracks

Kharroub

Laflamme

Cheng

et al. 2015

Smart Mater. Struct.

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Fatigue cracks on steel components may have strong consequences on the structure's serviceability and strength. Their detection and localization is a difficult task. Existing technologies enabling structural health monitoring have a complex link signal-to-damage or have economic barriers impeding large-scale deployment. A solution is to develop sensing methods that are inexpensive, scalable, with signals that can directly relate to damage. The authors have recently proposed a smart sensing skin for structural health monitoring applications to mesosystems. The sensor is a thin film soft elastomeric capacitor (SEC) that transduces strain into a measurable change in capacitance. Arranged in a network configuration, the SEC would have the capacity to detect and localize damage by detecting local deformation over a global surface, analogous to biological skin. In this paper, the performance of the SEC at detecting and localizing fatigue cracks in steel structures is investigated. Fatigue cracks are induced in steel specimens equipped with SECs, and data measured continuously. Test results show that the fatigue crack can be detected at an early stage. The smallest detectable crack length and width are 27.2 and 0.254 mm, respectively, and the average detectable crack length and width are 29.8 and 0.432 mm, respectively. Results also show that, when used in a network configuration, only the sensor located over the formed fatigue crack detect the damage, thus validating the capacity of the SEC at damage localization. Fatigue cracks on steel components may have strong consequences on the structure's serviceability and strength. Their detection and localization is a dicult task. Existing technologies enabling structural health monitoring have a complex link signalto-damage or have economic barriers impeding large-scale deployment. A solution is to develop sensing methods that are inexpensive, scalable, with signals that can directly relate to damage. The authors have recently proposed a smart sensing skin for structural health monitoring applications to mesosystems. The sensor is a thin lm soft elastomeric capacitor (SEC) that transduces strain into a measurable change in capacitance. Arranged in a network conguration, the SEC would have the capacity to detect and localize damage by detecting local deformation over a global surface, analogous to biological skin. In this paper, the performance of the SEC at detecting and localizing fatigue cracks in steel structures is investigated. Fatigue cracks are induced in steel specimens equipped with SECs, and data measured continuously. Test results show that the fatigue crack can be detected at an early stage. The smallest detectable crack length and width are 27.2 mm and 0.254 mm, respectively, and the average detectable crack length and width are 29.8 mm and 0.432 mm, respectively. Results also show that, when used in a network conguration, only the sensor located over the formed fatigue crack detect the damage, thus validating the capacity of the SEC at damage localizat...

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Elastomers for biomedical applications

Cited by 192 publications

References 289 publications

Dynamic Characterization of a Soft Elastomeric Capacitor for Structural Health Monitoring

Dynamic Characterization of a Soft Elastomeric Capacitor for Structural Health Monitoring

Interfacial treatment effects on behavior of soft nano-composites for highly stretchable dielectrics

Smart sensing skin for detection and localization of fatigue cracks

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