Ultrahigh and Tunable Electromagnetic Interference Shielding Performance of PVDF Composite Induced by Nano-Micro Cellular Structure

Yang, Yang; Zeng, Shuiping; Li, Xiping; Hu, Zhonglue; Zheng, Jiajia

doi:10.3390/polym14020234

Cited by 14 publications

(10 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be remarked that when the frequency was higher, the EMR absorption loss tended to be higher, whereas the reflection was diminished. This is in agreement with the literature data for other polymer composites [ 64 , 65 ], which states that the magnitude of conductivity and permeability is extremely important such that reflection effectiveness is impacted by the ratio σ/μ and the absorption is influenced by their product [ 66 ]. The deviation of the waves via reflection by the PEI/CoFe 2 O 4 films is caused by the distinct impedance of the shielding layer and the surrounding free space, while EMR attenuation occurs when unreflected waves penetrate the interior of the nanocomposite and is slightly stopped by dielectric and magnetic characteristics.…”

Section: Resultssupporting

confidence: 92%

Cobalt Ferrite/Polyetherimide Composites as Thermally Stable Materials for Electromagnetic Interference Shielding Uses

Asăndulesa¹,

Hamciuc²,

Pui

et al. 2023

IJMS

View full text Add to dashboard Cite

The progress of the automated industry has introduced many benefits in our daily life, but it also produces undesired electromagnetic interference (EMI) that distresses the end-users and functionality of electronic devices. This article develops new composites based on a polyetherimide (PEI) matrix and cobalt ferrite (CoFe2O4) nanofiller (10–50 wt%) by mixing inorganic phase in the poly(amic acid) solution, followed by film casting and controlled heating, to acquire the corresponding imide structure. The composites were designed to contain both electric and magnetic dipole sources by including highly polarizable groups (phenyls, ethers, -CN) in the PEI structure and by loading this matrix with magnetic nanoparticles, respectively. The films exhibited high thermal stability, having the temperature at which decomposition begins in the interval of 450–487 °C. Magnetic analyses indicated a saturation magnetization, coercitive force, and magnetic remanence of 27.9 emu g−1, 705 Oe, and 9.57 emu g−1, respectively, for the PEI/CoFe2O4 50 wt%. Electrical measurements evidenced an increase in the conductivity from 4.42 10−9 S/cm for the neat PEI to 1.70 10−8 S/cm for PEI/CoFe2O4 50 wt% at 1 MHz. The subglass γ- and β-relaxations, primary relaxation, and conductivity relaxation were also examined depending on the nanofiller content. These novel composites are investigated from the point of view of their EMI shielding properties, showing that they are capable of attenuating the electric and magnetic parts of electromagnetic waves.

show abstract

Section: Resultssupporting

confidence: 92%

Cobalt Ferrite/Polyetherimide Composites as Thermally Stable Materials for Electromagnetic Interference Shielding Uses

Asăndulesa¹,

Hamciuc²,

Pui

et al. 2023

IJMS

View full text Add to dashboard Cite

show abstract

“…The flexibility, process ability, sealing ability and stability indicate Energies 2022, 15, 4455 11 of 17 such material form. Due to the increasing EM pollution, investigations in EMI shielding materials have been very active in recent years; see e.g., [86][87][88][89][90][91][92][93][94][95][96][97].…”

Section: Shielding Technologiesmentioning

confidence: 99%

Biological and Medical Disturbances Due to Exposure to Fields Emitted by Electromagnetic Energy Devices—A Review

Razek

2022

Energies

View full text Add to dashboard Cite

The use of electromagnetic systems in daily life is on the rise. The immediate environment, of these electromagnetic energy devices, is exposed to their emitted fields. Environmental disturbances from such exposure could be severe in many ways; one of the most important is health. This could be directly related to the human body or to healthcare sensing and interventional devices. The review of the biological effects and disturbances of medical instruments due to electromagnetic field exposure is the subject of this article. The analysis of the different types of exposure as well as their control to meet safety requirements are investigated involving energy devices covering wide ranges of power and frequency. Thus, biological effects of both wireless telecommunications tools and inductive charging systems are reviewed. Next, we survey electromagnetic disturbances in sensing and stimulation instruments joint to the human body as well as devices used in medical interventions. Means of evaluating and controlling the effects of electromagnetic fields, through electromagnetic compatibility analysis, experimentally and by numerical modeling are conferred and assessed.

show abstract

“…Considering the consumer demand and convenience of usage, companies are also mainly focusing on developing high-performing electronic gadgets and appliances. [3][4][5] But at the same time, with this rapid usage of electronic devices, generated electromagnetic waves interfere with the input signals of the devices, creating a unique form of electromagnetic pollution or radiation known as electromagnetic interference (EMI). This electromagnetic wave radiation in the gigahertz range (30 MHz-12 GHz) is becoming a severe threat to biological systems and modern commercial goods.…”

Section: Introductionmentioning

confidence: 99%

“…GCEMS also estimated that after the pandemic, they observed a substantial rise in demand and receiving excellent comeback for both the larger and small electronic devices from the domestic sector compared with the commercial one. Considering the consumer demand and convenience of usage, companies are also mainly focusing on developing high‐performing electronic gadgets and appliances 3–5 . But at the same time, with this rapid usage of electronic devices, generated electromagnetic waves interfere with the input signals of the devices, creating a unique form of electromagnetic pollution or radiation known as electromagnetic interference (EMI).…”

Section: Introductionmentioning

confidence: 99%

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

Nivedhitha

Jeyanthi²

2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

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).

show abstract

Ultrahigh and Tunable Electromagnetic Interference Shielding Performance of PVDF Composite Induced by Nano-Micro Cellular Structure

Cited by 14 publications

References 61 publications

Cobalt Ferrite/Polyetherimide Composites as Thermally Stable Materials for Electromagnetic Interference Shielding Uses

Cobalt Ferrite/Polyetherimide Composites as Thermally Stable Materials for Electromagnetic Interference Shielding Uses

Biological and Medical Disturbances Due to Exposure to Fields Emitted by Electromagnetic Energy Devices—A Review

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

Contact Info

Product

Resources

About