Electrical and microstructural characterization of carbon nanotube-carbon fiber added cementitious conductive surface coating

Dehghanpour, Heydar

doi:10.1016/j.conbuildmat.2023.133449

Cited by 7 publications

(1 citation statement)

References 81 publications

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“…The existing literature predominantly explores cement-based matrices (such as cement pastes or mortars) and small-sized samples [26][27][28]. Nevertheless, the behavior of concrete smart composites and medium-to high-scale elements, together with the investigation of the tailored setup and implementation, remains largely unexplored territory, but are essential for real application of this technology [9,29,30]. Challenges associated with scaling this technology include ensuring the proper dispersion of fillers to achieve a homogeneous material, addressing potential adverse effects of coarse aggregates on strain sensitivity, and optimizing the type and placement of electrodes in large structures [31][32][33].…”

Section: State-of-the-artmentioning

confidence: 99%

Mechanical and Durability Investigation of Composite Mortar with Carbon Microfibers (CMF)

D’Alessandro,

Ubertini

2024

Applied Sciences

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This paper investigates the mechanical properties and the durability implications of innovative cement-based mortars doped with carbon microfibers. In particular, mixes with different amounts of carbon additions are produced, and the properties of fresh and hardened samples are analyzed through workability, water absorption, and compressive and flexural tests under specific environmental conditions. These composites can be employed to enhance construction performance or provide structures with strain-monitoring capabilities. However, the analysis of their mechanical properties and their durability behavior is needed before extensive structural use. In this work, the preparation procedure is defined for the various mix designs, considering different amounts of carbon microfibers; then, fresh properties are evaluated, and different types of samples formed. After various curing times, the specific rheological and hardened properties of the specimens are tested in different conditions to consider the durability of the composites, essential for the real-scale adoption in structural elements. Preliminary electrical and sensing tests are first conducted to evaluate the monitoring potential of the investigated composites. The findings highlight the impact of carbon inclusions on the performance of cement-based mortars, offering valuable insights for their utilization in masonry construction or for repairing concrete structures. In particular, sensing capabilities are found to be highly enhanced by the presence of CMF. Additionally, the results of this research pinpoint key areas for further analysis in the material’s development process.

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Section: State-of-the-artmentioning

confidence: 99%

Mechanical and Durability Investigation of Composite Mortar with Carbon Microfibers (CMF)

D’Alessandro,

Ubertini

2024

Applied Sciences

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A PVDF/MWCNTs/GO@MWCNTs/AgNWs bilayer structured composite film with ultra‐high EMI shielding and conductivity performance

Yang,

Tan,

Zhou

et al. 2024

Polymer Composites

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Electromagnetic interference (EMI) shielding materials with easy processing, high electrical conductivity, and excellent absorption loss are urgently needed in aerospace, military stealth and portable electronic devices. In this study, a polyvinylidene fluoride/multi‐walled carbon nanotubes (PVDF/MWCNTs)‐3 wt% composite film prepared by simple solution mixing and polyethylene terephthalate (PET) nonwoven scraping method was used as the substrate, and the PVDF/MWCNTs/graphene oxide@multi‐walled carbon nanotubes (PVDF/MWCNTs/GO@MWCNTs) and PVDF/MWCNTs/GO@MWCNTs/silver nanowires (PVDF/MWCNTs/GO@MWCNTs/AgNWs) bilayer composite films were prepared by vacuum‐assisted filtration (VAF). When the amount of GO@MWCNTs was 20 mL, the conductivity of PVDF/MWCNTs/GO@MWCNTs film is 3.5 × 101 S m−1, the total EMI shielding effectiveness (EMI SET) was 15.5 dB and the EMI absorption efficiency (EMI SEA) was 10.7 dB, the specific EMI SE (SSE/T) was 539.5 dB/ dB/(cm−2 g). When the amount of AgNWs was 25 mL, the conductivity of PVDF/MWCNTs/GO@MWCNTs/AgNWs film with 0.47 mm thickness was 1.6 × 104 S m−1, the EMI SET was 69.1 dB, the EMI SEA was 61.1 dB, and the SSE/T was 2320.0 dB cm2 g−1. The results show that the absorption was played a dominant role in the EMI shielding mechanism of obtained films. The addition of GO@MWCNTs/AgNWs increases the electrical conductivity and EMI shielding performance of the film more than the addition of GO@MWCNTs. This is mainly because GO， MWCNTs and AgNWs formed a novel three‐dimensional conductive network structure inside the composite film due to their hydrogen bonding and van der Waals forces, which increases the carrier channels and promotes the interaction between the internal microcurrents and the electromagnetic waves, achieving the purpose of attenuating the electromagnetic waves. The obtained PVDF/MWCNTs/GO@MWCNTs/AgNWs film has good potential in EMI shielding in aerospace, military and electronic intelligence applications.Highlights Well‐dispersed and highly conductive GO@MWCNTs were prepared by hydrothermal synthesis. AgNWs with good conductivity and high aspect ratio were prepared. PVDF‐based bilayer composite films with novel 3D conductive network were prepared. The synergistic EMI shielding mechanism of the film is discussed.

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A study on the corrosion inhibition properties of nano MWCNTs on TMT steel rebar developed using electroless nickel phosphorous (Ni–P) coating

Kumar,

Mandal,

Saha

et al. 2024

Asian J Civ Eng

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Electrical and microstructural characterization of carbon nanotube-carbon fiber added cementitious conductive surface coating

Cited by 7 publications

References 81 publications

Mechanical and Durability Investigation of Composite Mortar with Carbon Microfibers (CMF)

Mechanical and Durability Investigation of Composite Mortar with Carbon Microfibers (CMF)

A PVDF/MWCNTs/GO@MWCNTs/AgNWs bilayer structured composite film with ultra‐high EMI shielding and conductivity performance

A study on the corrosion inhibition properties of nano MWCNTs on TMT steel rebar developed using electroless nickel phosphorous (Ni–P) coating

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