Multifunctional composite with porous gradient structure for absorption-oriented ultrahigh electromagnetic interference shielding

Li, Mengyao; Liao, Huimin; Wang, Jian

doi:10.1016/j.compositesa.2023.107637

Cited by 12 publications

(4 citation statements)

References 49 publications

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“…Moreover, in rheological experiments, changes in viscosity imply structural recombination of particles and polymer chains, such as orientation of components, formation of filler networks, interlocking of particles, and so on. Adding inorganic fillers such as titanium dioxide, calcium carbonate, carbon black, and so forth, usually increases the viscosity of the polymeric matrix 35 . As the CaCO 3 content increased, the interaction between the polar particles and the polymer chain increased, leading to an increase in the viscosity of the hydrogel.…”

Section: Resultsmentioning

confidence: 99%

A facile method to fabricate multifunctional polyvinyl alcohol mineralized hydrogels with high strength and adaptable shape

Wang

Zhang

Shen

et al. 2023

Journal of Polymer Science

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Hydrogel‐based materials are widely used in many fields, but most of them compared to tendons with the same water content do not exhibit high toughness, strength or fatigue resistance, which limits their application. The Hofmeister effect can adjust the mechanical properties of hydrogels by ions affecting the aggregation of polymer chains. Herein, we prepared a bioactivated hydrogel through simply mixing polyvinyl alcohol (PVA) and Na2CO3 aqueous solutions. PVA chains are aggregated by strong hydrogen bonds between CO32− and OH, at which stage the hydrogel is soft and easy to shape. Further salting out promotes the formation of crystal microphase of PVA chain, resulting in high mechanical strength and excellent toughness. The existence of Na2CO3 endow the hydrogel with conductivity, exhibits high and stable sensitivity in strain sensing, and could be used to monitor human actions. On the basis of this method, Ca2+ was added to prepare mineralized PVA hydrogels, which had high stability and long‐term swelling resistance in different ionic solutions. In vitro cell experiment, hydrogel had obvious effect of promoting bone cell proliferation and calcium deposition. This work provides a facile and feasible method for preparing bionic hydrogels with high strength, toughness, and adaptable shape.

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Section: Resultsmentioning

confidence: 99%

A facile method to fabricate multifunctional polyvinyl alcohol mineralized hydrogels with high strength and adaptable shape

Wang

Zhang

Shen

et al. 2023

Journal of Polymer Science

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“…Electronic devices are widely applied in various fields such as communication, automation, military, etc. − In these applications, polymers are one of the most used materials due to their advantages of being lightweight, easy to process, low cost, etc. , However, the insulated polymers are unable to shield the electromagnetic waves. In this case, the electromagnetic radiation generated by the use of electronic devices will seriously affect the stability of electronic devices and threaten human health. , To address this issue, designing a polymer-based composite by introducing functional filler in a polymer matrix for effective electromagnetic interference (EMI) shielding performance is an effective method. − Normally, the EMI shielding effect of the reported EMI shielding materials is mainly achieved through absorption and reflection.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Porous MXene/Carbon Nanotube/Epoxy Composites for Effective Electromagnetic Interference Shielding and Flame Retardancy

Chang,

Gao,

Hao

et al. 2024

ACS Appl. Nano Mater.

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Designing a functional filler in a polymer matrix for effective electromagnetic interference (EMI) shielding and flame retardancy is of great importance in electronic devices. Achieving optimized distribution of fillers in polymer to build a conductive network for EMI shielding and intact barrier for flame retardancy is still a great challenge since the reported fillers usually exist as a disorder or even aggregation state. Herein, a porous carbon nanotube (CNT) bridged MXene (MXene/CNT) skeleton with electrical continuity and barrier integrity was designed by using a facile freeze-drying method. Benefiting from the rich hierarchical pores and excellent conductivity of MXene/CNT, the obtained MXene/CNT supported epoxy (EP) composite exhibits an effective EM shielding value of 34.7 dB. Furthermore, the EP composite shows improved flame retardancy than pure EP. Specifically, compared to pure EP, the EP composite with a low content of MXene/CNT (1.7 wt %) shows a decreased heat release rate (19.17%), smoke production rate (22.73%), CO production rate (25.21%) and CO 2 production rate (21.26%). This promising strategy provides a way to fabricate other advanced polymer composites.

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“…12−15 Moreover, the topological structure can significantly affect the materials' EMI SE, for example, the gradient and/or sandwich structures were demonstrated to enhance the effectiveness by facilitating multiple reflections between parallel reflective planes. 13,14,16,17 Currently, the transition metal carbides/nitrides (MXenes) have drawn exponential attention in the field of EMI shielding. 18−21 The MXene exhibits high electrical conductivity, reaching up to 9880 S m −1 .…”

Section: ■ Introductionmentioning

confidence: 99%

“…Electromagnetic interference (EMI) shielding materials, including carbon aerogels, , metallic materials, composite foams, , polymeric composites, − and cementitious composites, are booming. These materials possess high electrical conductivity, which plays a critical role to achieve high EMI shielding effectiveness (SE). − Moreover, the topological structure can significantly affect the materials’ EMI SE, for example, the gradient and/or sandwich structures were demonstrated to enhance the effectiveness by facilitating multiple reflections between parallel reflective planes. ,,, …”

Section: Introductionmentioning

confidence: 99%

Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

Gui,

Zhao,

Zuo

et al. 2023

ACS Appl. Mater. Interfaces

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Functional materials for electromagnetic interference (EMI) shielding are a consistently hot topic in the booming communication engineering, proceeding the development that tends to the multifunctional EMI shielding materials. Herein, a series of carbonized syndiotactic polystyrene/carbon nanotube/ MXene (CsPS/CNT/MXene) hybrid aerogels were fabricated for EMI shielding and solar thermal energy conversion purposes. To fabricate the hybrid aerogels, a porous CNT/MXene framework was initially prepared using freeze-casting. Subsequently, sPS was infused into the porous structure, followed by hyper-cross-linking and carbonization of sPS under an inert atmosphere. The resulting aerogels exhibited a distinctive egg-box structure, comprising numerous nanofibrous carbon microspheres embedded within the lamellar framework. The mass ratio between CNT and MXene was regulated to identify an optimum aerogel, that is, the CCM-4-6, which exhibited impressive properties including Young's compression modulus of 0.67 MPa, a water contact angle of 137.6 ± 4.1°, a specific surface area of 110 m 2 g −1 , an electrical conductivity of 43.0 S m −1 , and an EMI SE value of 40 dB. Meanwhile, phase-change composites were fabricated through encapsulating paraffin wax within the hybrid aerogels. For the CCM-4-6 aerogel, a noteworthy encapsulation ratio was achieved at about 76.7%, along with remarkable latent heat, good thermal reliability, and commendable solar thermal energy conversion capacity. This study presents a facile route to prepare multifunctional EMI shielding materials.

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Multifunctional composite with porous gradient structure for absorption-oriented ultrahigh electromagnetic interference shielding

Cited by 12 publications

References 49 publications

A facile method to fabricate multifunctional polyvinyl alcohol mineralized hydrogels with high strength and adaptable shape

A facile method to fabricate multifunctional polyvinyl alcohol mineralized hydrogels with high strength and adaptable shape

Hierarchically Porous MXene/Carbon Nanotube/Epoxy Composites for Effective Electromagnetic Interference Shielding and Flame Retardancy

Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

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