Total Shielding Efficiency, Reflection Loss and Absorption Loss of Nanoparticles/Paraffin Wax Absorber in the Shielding of Electromagnetic Pollution

Madvari, Rohollah Fallah; Hosseinabadi, Sedigheh; Bidel, Hamideh; Pourtaghi, Gholamhossein; Laal, Fereydoon

doi:10.1007/s42341-022-00406-8

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…N,N-Dimethylformamide (DMF) has a density of 0.948 g/cm 3 , provided by Tianjin Kemiou Chemical Reagent Co., Ltd.…”

Section: Methodsmentioning

confidence: 99%

“…The stability of the structure of the three-layer TPU/MWCNT porous composite materials was verified by SEM analyses and tensile experiments. The MWCNT (product code HQNANO−CNTs-006−4) has inner diameters of 5−12 nm and outer diameters of 30−50 nm and a length of 10−20 μm, a density of 2.1 g/cm 3 , and a conductivity of 100 S/cm. It is provided by Suzhou Carbon Nanotechnology Co., Ltd.…”

Section: Introductionmentioning

confidence: 99%

“…With the widespread use of gigahertz telecommunication equipment, electronic systems, digital systems, and fast processors, electromagnetic pollution has become a serious problem. − Electromagnetic interference (EMI) is an undesirable electromagnetic induction that causes nearby electronic circuits to generate the corresponding induction signals, thereby affecting and altering the original information on other electromagnetic waves. It may disturb the electronic devices, business machines, process equipment, measuring instruments, and apparatus or cause them to lose their original normal performance , and have potential effects on human health. − In order to attenuate or even eliminate the negative effects of electromagnetic pollution, many efforts and attempts have been made to develop electromagnetic shielding (electromagnetic interference shielding) materials.…”

Section: Introductionmentioning

confidence: 99%

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Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Wang,

Zheng

et al. 2023

ACS Appl. Polym. Mater.

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The widespread use of electronic products has led to serious electromagnetic pollution, which poses potential threats to communication systems and human health. The electromagnetic shielding effect can be significantly improved by increasing the conductivity of electromagnetic shielding materials, but impedance mismatch effects and serious secondary pollution are inevitable. Based on the nonsolvent-induced phase separation method, a gradient submicrometer porous structure sample was developed in this paper. Its continuous gradient conductive porous structure effectively improved excessive electromagnetic wave reflection pollution and the impedance mismatch effect. The thermoplastic polyurethane (TPU) and multiwalled carbon nanotube (MWCNT) blend solutions with different contents of MWCNT were deposited on the surface of the porous TPU/MWCNT material and induced in situ phase transformation repeatedly, and a multilayer porous material with gradient conductivity and a microcell structure was prepared. The cell size of the prepared TPU/MWCNT porous material is around 4 μm, which is much smaller than the size range of the existing electromagnetic shielding porous materials. The multilayer TPU/MWCNT porous materials effectively alleviate the impedance mismatch between the materials and the surrounding environment. The values of the total shielding effectiveness (SET) of the multilayer porous materials have reached over 24 dB, and the values of the reflective shielding effectiveness (SER) are less than 3 dB. The tensile test results show that the mechanical properties of the three-layer porous material present typical isotropic elastic polymer characteristics. The stress–strain curve is similar to that of the single-layer TPU/MWCNT porous material, and the tensile fracture section proves the stability of the bonding between the layers of the porous material. Moreover, the materials showed excellent flexibility performance in tensile, bending, and twisting tests. Therefore, the results of this study will have prospects in the application of flexible and high-performance electromagnetic shielding porous composite materials.

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“…N,N-Dimethylformamide (DMF) has a density of 0.948 g/cm 3 , provided by Tianjin Kemiou Chemical Reagent Co., Ltd.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Wang,

Zheng

et al. 2023

ACS Appl. Polym. Mater.

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show abstract

“…So, we can define that shielding effectiveness as a functional ratio of both conductivity and permeability of a material, as permeability and conductivity are two significant factors that can play a crucial effect on the performance of EMI SE. Few researchers have resulted that higher conductive materials cause higher reflection loss leading to higher value of R. 8,10,35 However, in a few cases, the involvement of internal reflections is neglected if the absorption loss is less than 10-12 dB, and only the reflection loss and absorption loss are taken into the count of total shielding effectiveness and written as equation (4).…”

Section: Se ¼ 10logmentioning

confidence: 99%

Polyvinylidene fluoride—An advanced smart polymer for electromagnetic interference shielding applications—A novel review

Nivedhitha

Jeyanthi²

2023

Polymers for Advanced Techs

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Emerging technology and modernization have become a worldwide threat to human life in all aspects. Worldwide, all countries are in the race to develop the most advanced electronic devices and gadgets as they reflect the country's superiority and economic development. Specialists have forecasted that during and after the pandemic, the addiction toward modern gadgets have increased by 40% among the people irrespective of age. A few researchers have reported that the world economy is dependent on and dominated by countries manufacturing semiconductors, mobiles, electronic chips, and so on. People started sensing that modern devices are like a boon, as their lives seem to be more connected and comfortable with all their needs and wants being fulfilled at their doorsteps. But this boon is slowly whirling as a severe threat to human lives. Due to this rapid usage of electronic devices, electromagnetic interference (EMI) is drastically growing, which is considered a global warning issue for commercial and biological systems. So advanced countries have decided to make EMI shielding a compulsory entity to be implemented in all advanced electronic devices. Though traditional materials like metals and carbon allotropes have excellent shielding properties, they cannot cope with today's mass production of modern devices. Thus, researchers had to find a suitable substitute material that should possess properties such as sustainability and biocompatibility to overcome problems faced by the conventional materials. Thus, polymers have come into the world of EMI shielding applications. Polyvinylidene fluoride (PVDF), a non‐conductive polymer from the family of Fluorocarbons, is creating history in the field of EMI shielding applications. PVDF astonished researchers with its versatile features, such as light weight, flexibility, and easy processibility with excellent dielectric and piezoelectric properties. Though they are poor in electrically conductive properties, incorporating metals, carbon allotropes, and metal oxides as fillers make them superior to the existing conventional materials. Thus, the main objective of this review article is to highlight the uniqueness of PVDF as an advanced polymer for EMI shielding applications. It has been noted that PVDF is more suitable for EMI shielding in X, K, and Ku band frequencies. But overall, we noticed that the performance of PVDF has a great impact by incorporating a combination of metal and carbon allotrope enhances the shielding effectiveness up to 65 dB in the Ku‐band (Kurz‐under) frequency band range of (12–18 GHz).

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VO ₂ based multi-functional ultra-wideband terahertz meta-absorber for EMI shielding application

Rani,

Bohre,

Bhattacharya

2024

Smart Science

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Total Shielding Efficiency, Reflection Loss and Absorption Loss of Nanoparticles/Paraffin Wax Absorber in the Shielding of Electromagnetic Pollution

Cited by 6 publications

References 31 publications

Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Polyvinylidene fluoride—An advanced smart polymer for electromagnetic interference shielding applications—A novel review

VO ₂ based multi-functional ultra-wideband terahertz meta-absorber for EMI shielding application

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Total Shielding Efficiency, Reflection Loss and Absorption Loss of Nanoparticles/Paraffin Wax Absorber in the Shielding of Electromagnetic Pollution

Cited by 6 publications

References 31 publications

Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Submicron Porous Gradient TPU/MWCNT Foam with Electromagnetic Shielding Performance

Polyvinylidene fluoride—An advanced smart polymer for electromagnetic interference shielding applications—A novel review

VO 2 based multi-functional ultra-wideband terahertz meta-absorber for EMI shielding application

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Product

Resources

About

VO ₂ based multi-functional ultra-wideband terahertz meta-absorber for EMI shielding application