Article
Materials Science, Composites
Yuan Fang, Long-Yuan Li, Sung-Hwan Jang
Summary: This paper presents an analytical model to describe how mechanical deformation affects the effective electrical conductivity of CNTs reinforced composites. The model identifies two mechanisms through which mechanical strain influences the conductivity, and provides analytical formulations for calculating this relationship. Validation of the model is performed using experimental data from literature on CNTs reinforced polymer composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Chemistry, Physical
Kai Ke, Liang Yue, Heqing Shao, Ming-Bo Yang, Wei Yang, Ica Manas-Zloczower
Summary: This paper reviews the effects of hybrid carbon fillers on the electrical properties of PNCs and their applications in piezoresistive sensing scenarios. Hybrid carbon nanofillers can effectively enhance the electrical conductivity and piezoresistive sensitivity of PNCs.
Article
Chemistry, Physical
Zhengwei Huang, Ying Song, Xiaohua Zhao, Huiming Hou
Summary: A three-dimensional piezoresistive theory for carbon nanotube polymer composites has been developed, considering the quantum tunneling effect and the geometric nonlinearity. The theory calculates the equivalent electrical conductivity of the composites based on the Mori-Tanaka method and incorporates finite element analysis of the elastic and electric fields. Numerical simulations showed good agreement with experimental tests and parameter sensitivity analysis revealed the influences of various physical parameters on the piezoresistivity.
Article
Materials Science, Composites
Wonbo Shim, Seung-Yeol Jeon, Woong-Ryeol Yu
Summary: The resistance change of carbon nanotube (CNT)/polymer composites during stress relaxation is strongly influenced by CNT concentration and aspect ratio. At low concentrations, the resistance increases regardless of CNT aspect ratio as relaxation progresses. A new resistor model based on the number of contacts between CNTs within tunneling distance was developed to explain this phenomenon, showing that insufficient contacts lead to increased tunneling resistance and overall resistance in the composites. This model was then used to qualitatively explain the resistance change during tensile tests, demonstrating its validity.
POLYMER COMPOSITES
(2022)
Article
Nanoscience & Nanotechnology
Tuba Evgin, Alpaslan Turgut, Georges Hamaoui, Zdeno Spitalsky, Nicolas Horny, Lutfiye Altay, Mihai Chirtoc, Maria Omastova
Summary: This study fabricates HDPE-based hybrid nanocomposites containing GnPs and MWCNTs, and finds that the size and weight ratio of carbon-based nanofillers significantly influence the properties of the composites. The optimum size and weight ratio of GnPs and MWCNTs are determined for maximum enhancement in different properties.
Article
Forestry
Jesco Schaefer, Christopher Jager, Ulrich Schwarz, Christoph Winkler
Summary: Research on wood adhesives filled with conductive fillers showed a measurable piezoresistive response under direct current, with higher signal noise and lower sensitivity. Impedance spectroscopy technique was used to study improvements in frequency-dependent piezoresistivity of multifunctional bonded wood. A setup-specific frequency band with optimized signal-to-noise ratio between 100 kHz and 1 MHz was derived from the measurements, providing more reliable signals with lower noise compared to DC resistography.
WOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Oleg V. Lebedev, Alexander N. Ozerin, Sergey G. Abaimov
Summary: The study investigated the piezoresistive effect of a polymer nanocomposite with a highly segregated distribution of conductive filler using ultrahigh-molecular-weight polyethylene as the base polymer and multiwalled carbon nanotubes as the nanofiller. A numerical multiscale approach based on the finite element method was proposed to predict changes in the conductive structure in response to uniaxial deformation. The results were compared with experimental data to validate the modeling assumptions.
Article
Materials Science, Multidisciplinary
Shufang Zheng, Yuyin Wang, Yifan Zhu, Chenxiao Zheng
Summary: Constructing three-dimensional segregated carbon-based nanofiller networks in the polymer matrix enhances the electrical and thermal conductivities of polymer composites. This review summarizes strategies for constructing segregated networks using various forms of carbon-based nanofillers and polymers, including 3D porous foam, particles/powders, fibers/fabrics, and aqueous latex. The review also discusses the influence of segregated networks on multifunctional performances and internal mechanisms, and analyzes current issues and future prospects.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Debmalya Roy, B. Vaishnav, Sarathlal Koyiloth Vayalil, Ajay Gupta, N. Eswara Prasad, Benedikt Sochor, Matthias Schwartzkopf, Stephan V. Roth, Tobias Kraus
Summary: This study investigates a major limitation of flexible sensors, namely the loss of conductivity upon multiple stretching and bending cycles. The researchers introduce conducting fillers with two different geometries, carbon black and carbon nanotubes, into polydimethylsiloxane (PDMS) to understand the effect of periodic tensile stress on the structure formation of nanofillers. The results show that loading the nanofillers beyond the percolation threshold ensures cyclic stability of the resulting network channels. In addition, they vary the surface chemistry of the carbon nanotubes to investigate interfacial interactions at the molecular level.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
De-Yang Wang, Zhen-Hua Tang, Pei Huang, Yuan-Qing Li, Shao-Yun Fu
Summary: A numerical model is proposed in this study to predict the electrical behavior of CNT/polymer composites (CPCs), taking into account both the length non-uniformity and waviness of CNTs. The results show that these two factors have significant effects on the electrical behavior of CPCs.
Review
Chemistry, Multidisciplinary
Shengchang Mu, Jianguang Yue, Yu Wang, Chuang Feng
Summary: This paper reviews existing studies on graphene reinforced cement composite materials (GRCCMs), focusing on three material properties (electrical, piezoresistive, and electromagnetic) correlated to the multifunction of graphene fillers. Graphene fillers demonstrate better reinforcing effects compared to other fillers due to their large specific surface area. The review identifies challenges and research gaps for future research and aims to provide more insightful perspectives for developing multifunctional GRCCMs.
Article
Materials Science, Characterization & Testing
Mohammad Farhadpour, Gholamreza Pircheraghi, Bahereh T. Marouf, Reza Bagheri
Summary: The effects of the morphological structure and selective localization of carbon nanotubes (CNTs) and conductive carbon black (CCB) in polyamide-6/poly(phenylene oxide) (PA6/PPO) nanocomposites on electrical conductivity were investigated. It was found that the selective localization of CNTs/CCB in the PA6 matrix and the reduction of the PA6 transcrystalline layer can significantly increase the electrical conductivity. The morphology and selective localization are influenced by the PA6/PPO ratio and mixing sequence.
Article
Chemistry, Physical
G. M. Koo, T. N. Tallman
Summary: The study explores the AC conductivity-strain relations for polymeric carbon nanofiber composites, finding that Jonscher's power law accurately describes the AC conductivity as a function of both normal and shear strain. The material exhibits frequency-dependent piezoresistive switching behavior, with positive piezoresistivity at low frequencies and negative piezoresistivity at higher frequencies. This novel switching behavior is attributed to inter-CNF AC transport behaving like a parallel resistor-capacitor arrangement, offering exciting possibilities for frequency-selective piezoresistive behavior in next-generation carbon nanofiller-based sensors.
Article
Engineering, Manufacturing
Anli Chen, Chaoying Wang, Ola A. Abu Ali, Samy F. Mahmoud, Yuting Shi, Yanxiu Ji, Hassan Algadi, Salah M. El-Bahy, Mina Huang, Zhanhu Guo, Dapeng Cui, Huige Wei
Summary: A simple strategy is proposed to fabricate MXene@nitrogen-doped carbon (MC) composite film with porous networks. Nitrogen doping improves the electrochemical performance of MC, while the porous network increases ion transport rate and strain sensitivity. The assembled device and sensor based on MC exhibit high energy density and sensitivity.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Mojtaba Haghgoo, Reza Ansari, Mohammad K. Hassanzadeh-Aghdam, Mohammad Nankali
Summary: This study investigates the temperature-dependent piezoresistivity of hybrid carbon black/carbon nanotube nanocomposites using a Monte Carlo simulation approach. The results show that the aspect ratio and dispersion state affect the percolation threshold and resistivity, and the piezoresistivity increases with the decrease in the Poisson's ratio and intrinsic electrical conductivity.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Chemistry, Physical
Andrea Caradonna, Claudio Badini, Elisa Padovano, Mario Pietroluongo
Article
Materials Science, Composites
Filippo Valorosi, Enea De Meo, Tamara Blanco-Varela, Brunetto Martorana, Antonino Veca, Nicola Pugno, Ian A. Kinloch, George Anagnostopoulos, Costas Galiotis, Francesco Bertocchi, Julio Gomez, Emanuele Treossi, Robert J. Young, Vincenzo Palermo
COMPOSITES SCIENCE AND TECHNOLOGY
(2020)
Article
Polymer Science
Claudio Badini, Elisa Padovano, Rosario De Camillis, Vito Guido Lambertini, Mario Pietroluongo
JOURNAL OF APPLIED POLYMER SCIENCE
(2020)
Article
Chemistry, Applied
E. Padovano, M. E. Bonelli, A. Veca, E. De Meo, C. Badini
REACTIVE & FUNCTIONAL POLYMERS
(2020)
Article
Materials Science, Multidisciplinary
Federico Lupone, Elisa Padovano, Antonino Veca, Lorena Franceschetti, Claudio Badini
MATERIALS & DESIGN
(2020)
Article
Environmental Sciences
Claudia Belviso, Pietro Montano, Antonio Lettino, Francesco Toschi, Vito Guido Lambertini, Antonino D. Veca, Elisabetta Moschetto, Francesco Cavalcante, Ambra Guarnaccio
Summary: The study found that adding a small amount of sepiolite or LTA zeolite to waste polypropylene can improve some mechanical and rheological properties, but simply mixing waste and fillers can have an impact on the recycling process.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Polymer Science
F. Lupone, E. Padovano, M. Pietroluongo, S. Giudice, O. Ostrovskaya, C. Badini
Summary: The research focuses on optimizing SLS process parameters based on material properties, showing that the best combination of mechanical properties and dimensional accuracy for two polymer-based powders can be achieved by using specific laser energy density values.
EXPRESS POLYMER LETTERS
(2021)
Article
Materials Science, Composites
Enea De Meo, Simone Agnelli, Antonino Veca, Valentia Brunella, Marco Zanetti
JOURNAL OF COMPOSITES SCIENCE
(2020)
Review
Green & Sustainable Science & Technology
Mario Pietroluongo, Elisa Padovano, Alberto Frache, Claudio Badini
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2020)
