Article
Polymer Science
Xinlei Tang, Juergen Pionteck, Petra Poetschke
Summary: In this study, the piezoresistive behavior of carbon black and partially crystalline poly(vinylidene fluoride) (PVDF) composites was improved through the addition of either amorphous poly (methyl methacrylate) (PMMA) or partially crystalline poly(butylene succinate) (PBS). The addition of 30 wt% PBS significantly reduced the electrical percolation threshold, enabling the use of low concentration carbon black for piezoresistive testing. The resulting composite exhibited nearly linear piezoresistive behavior with a significantly enhanced relative electrical resistance change delta R/R-0 of 71.8 +/- 7.1% at 5% strain.
Article
Nanoscience & Nanotechnology
Hsin-Jung Tsai, Wei-Chun Li, Wen-Kuang Hsu
Summary: Composites made from multi-walled carbon nanotubes and polydimethylsiloxane exhibit excellent piezoresistivity at elastic limits, with high sensitivity and matched resistance changes during bending and twisting. Pulse-like resistance changes are attributed to the rapid increase in intertube spacing. The movement and segmentation of tube aggregates explain the tube mobility range and sensing mechanism.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Muhammad Umar Azam, Andreas Schiffer, S. Kumar
Summary: This study investigates the piezoresistive and mechanical behaviors of multiwalled carbon nanotube (MWCNT) /polyamide (PA12) lattice composites processed via selective laser sintering (SLS). The results show that increasing the MWCNT loading significantly increases the porosity of the sintered composites, resulting in decreased elastic stiffness and strength but enhanced piezoresistive characteristics. Furthermore, the composites exhibit different energy absorption and strain sensing characteristics under different loadings.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Composites
E. Pimentela, P. Costa, C. R. Tubio, J. L. Vilaca, C. M. Costa, S. Lanceros-Mendez, D. Miranda
Summary: Flexible sensor devices are in high demand for new and improved health treatments, particularly for neurogenic bladder dysfunction. Polymer composites based on different matrices (CMC, SEBS, and PVA) and varying concentrations of multiwalled carbon nanotubes (CNT) have been developed for catheter medical device application. These composites demonstrate excellent electrical and mechanical properties, with high conductivity and piezoresistive response.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Josu Fernandez Maestu, Ander Garcia Diez, Carmen R. Tubio, Ainara Gomez, Joanes Berasategui, Pedro Costa, M. Mounir Bou-Ali, Jon Gutierrez Etxebarria, Senentxu Lanceros-Mendez
Summary: Advances in the development of magnetorheological elastomers (MREs) with self-sensing characteristics are reported in this study. Conductive fillers were added to increase the applicability of MREs. The SEBS matrix with embedded Fe3O4 nanoparticles as magnetically responsive materials and MWCNT as conductive fillers were used to prepare multifunctional MREs. The addition of MWCNT improved the mechanical, electrical, magnetorheological, and piezoresistive properties of the composites, making them suitable for self-sensing deformation in magnetorheological actuators.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiankun Huang, Jingbin Zeng, Xue Zhang, Gengchen Guo, Rui Liu, Zifeng Yan, Yadong Yin
Summary: This study introduces a hybrid aerogel/hydrogel sensor with high sensitivity and broad sensing range, integrating polypyrrole aerogel with PAAm hydrogel. The sensor demonstrates linear response, high sensitivity, and stable performance over a wide pressure range, making it ideal for monitoring pressures from human physiological signals to significant stress exerted by vehicles.
Article
Materials Science, Multidisciplinary
Wolfgang Klimm, Kawai Kwok
Summary: This study evaluates the modeling assumptions of piezoresistivity in carbon nanotube polymer composites to establish an approach with improved predictive accuracy. The effects of CNT extensibility, tunneling cross-section, and conduction channels on piezoresistive response are investigated.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Ting Yui Wong, Tao Yu, Fangxin Zou
Summary: Non-monotonic electrical resistance changes have been observed in multi-walled carbon nanotube (MWNT)/epoxy nanocomposites under tensile loading, but the mechanism is not fully understood. This study evaluates the impact of curing condition on the piezoresistivity of MWNT/epoxy nanocomposites, and suggests that a higher curing temperature can enhance the monotony of the piezoresistivity. The results indicate that the molecular structure of the polymer matrix contributes to the non-monotonic piezoresistivity of CNT/epoxy nanocomposites.
COMPOSITES COMMUNICATIONS
(2023)
Article
Polymer Science
Bangwei Wan, Yang Yang, Rongxin Guo, Zhengming Fan, Peng Deng, Shibo Zhang
Summary: A MWCNT/VMQ composite was prepared using DCP and DBPMH as vulcanizing agents, and the effects of the different agents on the properties of the composite were investigated. The DCP-vulcanized composites showed better mechanical properties and stability, as well as a more stable damage-reconstruction mechanism for the MWCNT network during deformation. An analytical model based on the tunnel effect theory confirmed the potential of this composite for real-time strain monitoring for large deformation structures.
Review
Chemistry, Analytical
Anindya Nag, Md. Eshrat E. Alahi, Subhas Chandra Mukhopadhyay, Zhi Liu
Summary: This paper showcases the use of MWCNT-based sensors for strain-strain applications, highlighting their enhanced electrical, mechanical, and thermal properties. MWCNT-based sensors have proven their ability to deduce a broad spectrum of macro- and micro-scaled tensions and have been widely utilized in various applications.
Article
Engineering, Multidisciplinary
J. Qiu, M. K. Idris, G. Grau, G. W. Melenka
Summary: This paper presents a machine vision-based strain and damage visualization technique using smart electroluminescent integration for carbon fiber reinforced polymer (CFRP) material inspection. The technique allows for real-time visualization of deformation and cracks in CFRP lamina during progressive axial loading, providing a portable and low-cost alternative to traditional non-destructive testing methods.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Construction & Building Technology
Wenkui Dong, Wengui Li, Xinqun Zhu, Daichao Sheng, Surendra P. Shah
Summary: Multifunctional cementitious composites with integrated self-sensing and hydrophobicity capacities were developed and investigated using conductive graphene nanoplate (GNP) and silicone hydrophobic powder (SHP). The highest compressive and flexural strengths were achieved with 1% SHP and 2% GNP, while water absorption decreased significantly with SHP content. The water contact angle initially increased and then decreased with the dosages of GNP and SHP.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Chao Liu, Linh Le, Mingshao Zhang, Junjun Ding
Summary: This article presents a compressive strain sensor fabricated using carbon nanotubes (CNT) and polydimethylsiloxane (PDMS) that exhibits tunable mechanical and electrical performances. The composite material, produced through material extrusion 3D printing, shows excellent mechanical strength and electrical conductivity thanks to the addition of CNT. It also demonstrates stable performance under large-scale compressive strain.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
M. Di Mare, C. M. Ouellet-Plamondon
Summary: Structural health monitoring can be revolutionized by using potassium-activated inorganic polymers as self-sensing materials, achieving high strength, piezoresistivity, scalability, and affordability without the need for conductive fiber additives. These materials are considered the best candidate for future structural health monitoring applications.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Materials Science, Composites
Iee Lee Hia, Alexander D. Snyder, Jack S. Turicek, Fernanda Blanc, Jason F. Patrick, Daniel Therriault
Summary: Structural health monitoring (SHM) is crucial for safety-critical composite components to ensure mechanical stability and detect local damage. Traditional piezoresistive strain sensors lack customization and adaptability, but additive manufacturing via fused filament fabrication (FFF) offers a solution. A new electrically responsive nanocomposite is developed using a 3D-printable blend of poly(ethylene-co-methacrylic acid) (EMAA) and multi-walled carbon nanotubes (MWCNT) with enhanced electrical conductivity.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
