Modulating electromagnetic interference shielding performance of ultra-lightweight composite foams through shape memory function

Zhu, Shu; Zhou, Qingya; Wang, Mengya; Dale, Jackson; Qiang, Zhe; Fan, Yuchi; Zhu, Meifang; Ye, Changhuai

doi:10.1016/j.compositesb.2020.108497

Cited by 86 publications

(44 citation statements)

References 62 publications

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“…The EMI SE was evaluated from the measured S parameters (S 11 and S 21 ) and calculated according to the following equations. [ 54 ]

\begin{matrix} S E_{normalT} (dB) = S E_{normalR} + S E_{normalA} + S E_{normalM} \end{matrix}

\begin{matrix} S E_{normalR} (dB) = - 10 \log (1 - {(||, S_{11})}^{2}) \end{matrix}

\begin{matrix} S E_{normalA} (dB) = - 10 \log (\frac{{|S_{21}|}^{2}}{(1 - {(||, S_{11})}^{2})}) \end{matrix}

where SE T , SE R , and SE A are the total, reflection, and absorption shielding efficiencies, respectively. SE M is multiple reflections shielding, which is negligible when SE abs ≥ 15 dB.…”

Section: Methodsmentioning

confidence: 99%

Mechanically Strong and Multifunctional Hybrid Hydrogels with Ultrahigh Electrical Conductivity

Zhou

Lyu

Wang

et al. 2021

Adv Funct Materials

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158

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Stretchable conductive hydrogels with simultaneous high mechanical strength/modulus, and ultrahigh, stable electrical conductivity are ideal for applications in soft robots, artificial skin, and bioelectronics, but to date, they are still very challenging to fabricate. Herein, sandwich‐structured hybrid hydrogels based on layers of aramid nanofibers (ANFs) reinforced polyvinyl alcohol (PVA) hydrogels and a layer of silver nanowires (AgNWs)/PVA are fabricated by electrospinning combined with vacuum‐assisted filtration. The hybrid ANF‐PVA hydrogels exhibit excellent mechanical properties with the tensile modulus of 10.7–15.4 MPa, tensile strength of 3.3–5.5 MPa, and fracture energy up to 5.7 kJ m−2, primarily attributed to the strong hydrogen bonding interactions between PVA and ANFs and in‐plane alignment of the fibrous structure. Rational design of heterogeneous structure endows the hydrogels with ultrahigh apparent electrical conductivity of 1.66 × 104 S m−1, among the highest electrical conductivities ever reported so far for conductive hydrogels. More importantly, this ultrahigh conductivity remains constant upon a broad range of applied strains from 0–90% and over 500 stretching cycles. Furthermore, the hydrogels exhibit excellent Joule heating and electromagnetic interference shielding performances due to the ultrahigh electrical conductivity. These mechanically strong, hybrid hydrogels with ultrahigh and strain‐invariant electrical conductivity represent great promises for many important applications such as flexible electronics.

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“…The EMI SE was evaluated from the measured S parameters (S 11 and S 21 ) and calculated according to the following equations. [ 54 ]

\begin{matrix} S E_{normalT} (dB) = S E_{normalR} + S E_{normalA} + S E_{normalM} \end{matrix}

\begin{matrix} S E_{normalR} (dB) = - 10 \log (1 - {(||, S_{11})}^{2}) \end{matrix}

\begin{matrix} S E_{normalA} (dB) = - 10 \log (\frac{{|S_{21}|}^{2}}{(1 - {(||, S_{11})}^{2})}) \end{matrix}

where SE T , SE R , and SE A are the total, reflection, and absorption shielding efficiencies, respectively. SE M is multiple reflections shielding, which is negligible when SE abs ≥ 15 dB.…”

Section: Methodsmentioning

confidence: 99%

Mechanically Strong and Multifunctional Hybrid Hydrogels with Ultrahigh Electrical Conductivity

Zhou

Lyu

Wang

et al. 2021

Adv Funct Materials

Self Cite

158

View full text Add to dashboard Cite

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“… Molecular dynamics [ 168 , 169 , 170 ], phase field method [ 171 , 172 , 173 ], peridynamics [ 174 ] combined with multi-physics coupling calculations can obtain the nanoscale structural evolution and multifunctional performance of cellular media. Multifunctional applications for potential industrial applications, such as: high-performance wave absorption characteristics [ 175 , 176 , 177 ], electromagnetic interference shielding [ 162 , 178 , 179 , 180 ], adsorption thermodynamics and dynamics characteristics [ 181 ], and can be used in medical care, satellite communications, electronic equipment, national defense security and other fields in the future [ 180 , 182 , 183 , 184 , 185 ]. And conduct more experiments to verify potential industrial applications.…”

Section: Discussionmentioning

confidence: 99%

“…Multifunctional applications for potential industrial applications, such as: highperformance wave absorption characteristics [175][176][177], electromagnetic interference shielding [162,[178][179][180], adsorption thermodynamics and dynamics characteristics [181], and can be used in medical care, satellite communications, electronic equipment, national defense security and other fields in the future [180,[182][183][184][185]. And conduct more experiments to verify potential industrial applications.…”

mentioning

confidence: 99%

A Review on Mechanical Models for Cellular Media: Investigation on Material Characterization and Numerical Simulation

et al. 2021

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Cellular media materials are used for automobiles, aircrafts, energy-efficient buildings, transportation, and other fields due to their light weight, designability, and good impact resistance. To devise a buffer structure reasonably and avoid resource and economic loss, it is necessary to completely comprehend the constitutive relationship of the buffer structure. This paper introduces the progress on research of the mechanical properties characterization, constitutive equations, and numerical simulation of porous structures. Currently, various methods can be used to construct cellular media mechanical models including simplified phenomenological constitutive models, homogenization algorithm models, single cell models, and multi-cell models. This paper reviews current key mechanical models for cellular media, attempting to track their evolution from their inception to their latest development. These models are categorized in terms of their mechanical modeling methods. This paper focuses on the importance of constitutive relationships and microstructure models in studying mechanical properties and optimizing structural design. The key issues concerning this topic and future directions for research are also discussed.

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“…In the case of PPE applications, PUFs are leaders with many products on the market, [1,112,113] e.g. shock protection/comfort materials (packaging, shoe soles, helmets, cushion, matrasses,…), [19,114] electromagnetic interference absorbers, [26,115,116] thermal or sound insulating panels, [117,118] water or air filtration devices, [12] ear plugs, etc. [119,120]…”

Section: A Thermal Degradation Of In-situ Generated Carbamic Acid Derivatives Formation Of Carbamic Acid By Reaction Of Isocyanates With mentioning

confidence: 99%

Self-foaming polymers: Opportunities for the next generation of personal protective equipment

Monie

Vidil

Grignard

et al. 2021

Materials Science and Engineering: R: Reports

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Modulating electromagnetic interference shielding performance of ultra-lightweight composite foams through shape memory function

Cited by 86 publications

References 62 publications

Mechanically Strong and Multifunctional Hybrid Hydrogels with Ultrahigh Electrical Conductivity

Mechanically Strong and Multifunctional Hybrid Hydrogels with Ultrahigh Electrical Conductivity

A Review on Mechanical Models for Cellular Media: Investigation on Material Characterization and Numerical Simulation

Self-foaming polymers: Opportunities for the next generation of personal protective equipment

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