Electromagnetic wave absorption and heat storage dual-functional cement composites incorporated with carbon nanotubes and phase change microcapsule

Xie, Shuai; Ma, Chao; Ji, Zhijiang; Wu, Zihao; Si, Tiantian; Wang, Yongchao; Wang, Jing

doi:10.1016/j.jobe.2023.105925

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…Figure 6 illustrates the RL of single layer EM wave absorption material with a 20 mm thickness in the frequency ranges of 1-18 GHz, from which it can be observed that there are several evident peaks appearing in the RL curve of each specimen. The frequency at evident peaks shifts to low frequency with the increase of CB and WIP content and reduction of EP content, which can be explained by Eq.5 [35,36]. Due to the enhancement of the EM parameter according to the Figure 4, Figure 5, and Figure S1-S9, the matching frequency reduces.…”

Section: The Rl Of Multilayer Em Wave Absorption Materialsmentioning

confidence: 88%

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Xie

et al. 2023

J. Mater. Sci. Technol. Res.

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Due to the complexity of the design of multilayer electromagnetic (EM) wave absorbing materials, it is difficult to establish the relationship between material parameters (type and filling ratios) and EM properties using traditional trial and error methods. Based on the measured EM parameters within a few materials and Boltzmann mixing theory, a database of EM parameters was thereafter built up. In this study, the genetic algorithm (GA) was used to design the multilayer wave-absorbing cement mortar. In order to verify this method, a multilayer mortar was fabricated and measured. The simulated and measured results are well consistent, which convincingly verifies computer-aided design. In addition, the optimized result expresses that the first layer as a matching layer guides EM waves into the interior of the material, while the other layers as absorption layers attenuate EM waves. The multilayer material may not meet the impedance gradient principle but still exhibits better EM wave absorption performance. The reflection loss (RL) of all optimized three layer sample is below –6.89 dB in the full frequency band and the minimum RL is –26.21 dB. This composite absorbing material and the GA method provide more design ideas for the design of future cement-based wave-absorbing materials and save a lot of time and material cost.

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Section: The Rl Of Multilayer Em Wave Absorption Materialsmentioning

confidence: 88%

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Xie

et al. 2023

J. Mater. Sci. Technol. Res.

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“…Through a comprehensive comparison in Figure 5a and Table S4 with other reported multifunctional materials in terms of respective performance parameters, including EAB bandwidth and corresponding thickness, minimum RL (RL min ), thermal conductivity, and latent heat. 22,24,43,44 It is evident that PBC@W stands out as the sole composite capable of harmonizing three crucial functions: wideband EM wave attenuation, high latent heat for thermal energy storage, and effective thermal conduction featuring a notably high thermal conductivity. Notably, the thermal conductivity of PBC@W surpasses that of other materials, even when compared specifically to materials designed for both EM wave attenuation and thermal conduction, as illustrated in Figure 5b and Table S5.…”

Section: Electromagnetic Wave Attenuation Of Pbc@w Compositesmentioning

confidence: 99%

Thermally Conductive Phase Change Composites for Wideband Electromagnetic Noise Reduction and Thermal Management

Yao,

Tay,

Jin

et al. 2024

ACS Appl. Eng. Mater.

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For the advancement of next-generation electronic devices and telecommunication, the development of multifunctional materials integrating electromagnetic (EM) wave attenuation and thermal management is crucial and challenging. In this study, multifunctional poly(dimethylsiloxane) (PDMS)/boron nitride (BN)/carbon nanotubes (CNT) @paraffin wax phase change composites (PBC@W) were developed using a low-cost template method. Thanks to the well-constructed thermally conductive network of multidimensional fillers (two-dimensional BN sheets and one-dimensional CNT) in the PDMS matrix, the PBC@W composites could achieve a thermal conductivity of 1.63 W/m•K while showing a high latent heat of 125 J/g for efficient thermal energy storage. As a result, it can serve as a heat sink to store thermal energy and also stabilize the temperature of electronic devices against thermal shock. Meanwhile, the proven full X-band microwave attenuation performance of over 10 dB (effective attenuation bandwidth >4.2 GHz) at thicknesses less than 3.1 mm provides the devices with effective protection from EM noises. The combination of such thermally conductive features, high latent heat, and wideband EM wave attenuation performance in one material offers an innovative low-profile material solution to alleviate the ever-increasing thermal and electromagnetic interference (EMI) issues in miniaturized high-speed electronic systems.

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“…They found that PCM particles can improve the adequacy of cement composite impedance and introduce additional EM mitigation trajectories of diffusion and multiple reflections. When the PCM content is fixed at 20 %, the heating rate can be reduced by approximately 47 % [11]. The addition of CNTs enables the cement composite material to have significant heat storage capacity and better thermal inertia.…”

Section: Application Of Cnts In Building Materialsmentioning

confidence: 99%

Application of Carbon Nanotubes in Various Fields

Pan

2023

MATEC Web Conf.

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There have been more studies on the characteristics and uses of carbon nanotubes (CNTs) in recent years as a result of the advancement of nanomaterials and nanotechnology. CNTs are used in a greater variety of applications due to their powerful adsorption, stable molecular structure, high thermal conductivity, and other qualities. This paper introduces the role of CNTs in textile, construction and environmental science. Specifically, in the textile industry, CNTs have the functions of electromagnetic signal shielding, UV protection and flexible sensing in the field of material strength and high-temperature resistance. In terms of building and construction, CNTs can be composite with cement and concrete to improve mechanical properties. In sewage treatment applications, CNTs are characterized by high specific surface area, high porosity, high hydrophobicity, and electrocatalysis. This paper provides a reference for the development of the above fields, refers to the problems existing in the practical application of CNTs, and prospects the deeper development of CNTs materials.

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Electromagnetic wave absorption and heat storage dual-functional cement composites incorporated with carbon nanotubes and phase change microcapsule

Cited by 11 publications

References 36 publications

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Thermally Conductive Phase Change Composites for Wideband Electromagnetic Noise Reduction and Thermal Management

Application of Carbon Nanotubes in Various Fields

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