Electromagnetic shielding properties of cementitious composites containing carbon nanofibers, zinc oxide, and activated carbon powder

Wanasinghe, Dimuthu; Aslani, Farhad; Ma, Guowei

doi:10.1016/j.conbuildmat.2021.122842

Cited by 21 publications

(9 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Metal oxides are grabbing great attention of researchers because they are cheap, nontoxic, and environment friendly, making them more suitable for EMI shielding. 81,82 But the major disadvantages of adopting metal oxides are fabrication-related difficulties such as agglomeration and poor dispersion with metals. 83,84…”

Section: Metal Oxides For Electromagnetic Shielding Materialsmentioning

confidence: 99%

“…Transition metal oxides such as zirconium oxide, zinc oxide (ZnO), magnesium oxide, silicon dioxide, titanium oxide, and barium titanate as fillers improved the permittivity, which can prevent EMI radiation 10 ; Furthermore, literature reports proved that adding these materials gradually improved the dielectric losses, doubling the absorption mechanism's attenuation. Metal oxides are grabbing great attention of researchers because they are cheap, nontoxic, and environment friendly, making them more suitable for EMI shielding 81,82 . But the major disadvantages of adopting metal oxides are fabrication‐related difficulties such as agglomeration and poor dispersion with metals 83,84 .…”

Section: Selection Of Materials For Electromagnetic Shieldingmentioning

confidence: 99%

See 1 more Smart Citation

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

Section: Metal Oxides For Electromagnetic Shielding Materialsmentioning

confidence: 99%

Section: Selection Of Materials For Electromagnetic Shieldingmentioning

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

show abstract

“…However, some researchers are also concerned that the sole conductive additive may not provide sufficient improvement to the SE to meet the industrial standard requirements, and have introduced a series of second additives that have been reported to have potential to further increase the SE. Wanasinghe et al studied the overall shielding properties of the composites incorporating different types and contents of carbon nanofibres, with varied fractions of zinc oxide and activated carbon powder combined with 12 mm unsized carbon fibres following the standard of ASTM D4935-18 [ 8 ]. Their results revealed that the inclusion of the activated carbon powder showed the most significant improvement in electrical conductivity as well as the overall SE among all the types of additives.…”

Section: Introductionmentioning

confidence: 99%

“…Their results revealed that the inclusion of the activated carbon powder showed the most significant improvement in electrical conductivity as well as the overall SE among all the types of additives. However, the authors also reported an issue of increasing ACP content up to 2%, in which the mixes became crumbled and unworkable [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Prediction Models of Shielding Effectiveness of Carbon Fibre Reinforced Cement-Based Composites against Electromagnetic Interference

Narayanan

Zhang

Aslani

2023

Sensors

Self Cite

View full text Add to dashboard Cite

With the rapid development of communication technology as well as a rapid rise in the usage of electronic devices, a growth of concerns over unintentional electromagnetic interference emitted by these devices has been witnessed. Pioneer researchers have deeply studied the relationship between the shielding effectiveness and a few mixed design parameters for cementitious composites incoporating carbon fibres by conducting physical experiments. This paper, therefore, aims to develop and propose a series of prediction models for the shielding effectiveness of cementitious composites involving carbon fibres using frequency and mixed design parameters, such as the water-to-cement ratio, fibre content, sand-to-cement ratio and aspect ratio of the fibres. A multi-variable non-linear regression model and a backpropagation neural network (BPNN) model were developed to meet the different accuracy requirements as well as the complexity requirements. The results showed that the regression model reached an R2 of 0.88 with a root mean squared error (RMSE) of 2.3 dB for the testing set while the BPNN model had an R2 of 0.96 with an RMSE of 2.64 dB. Both models exhibited a sufficient prediction accuracy, and the results also supported that both the regression and the BPNN model are reasonable for such estimation.

show abstract

“…In the same manner, the absorption mechanism mainly cats on attenuating the magnetic components of the EM wave. For this, the material should have electric and magnetic dipoles as they can cut the magnetic field lines that travel through the material [10,11].Therefore, the material should possess electrical conductivity and magnetic permeability to achieve efficient EMI shielding [12,13]. Chaofan et al, 2003 established a research work on enhanced EMI shielding performance of silver nanowires doped with MXene films in which absorption mechanism has been recorded, resulting in a maximum of 38.4 dB at the X-band frequency range [14].…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of flexible pvdf based smart films for advanced electromagnetic shielding applications using a machine learning approach

Nivedhitha,

Jeyanthi,

Rajalakshmi

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

Due to emerging technology, the usage of electronic gadgets has paved a route for the arousal of Electromagnetic Interference (EMI) pollution. Electromagnetic pollution is considered a global threat that can harm all biological systems and technological equipment. To overcome this issue, a suitable shielding material has to be implemented to attenuate the incoming electromagnetic waves. On the other hand, compared to traditional materials, recently, polymers have grabbed excellent responses in various fields of material science and modern chemistry. Specifically, functional polymers are increasing their scope in industry and academia due to their unique features, such as magnetic, catalysis, optical and piezoelectric properties. In this regard, Polyvinylidene Fluoride (PVDF), a well-known semicrystalline polymer from the family of Fluoropolymers, has achieved remarkable in various applications of sensors, actuators, biomedical scaffolds and energy harvesting devices. PVDF has also contributed excellent outcomes as a shielding material as they are transparent to light and flexible. Hence, this research work attempts to fabricate PVDF thin films with various weight percentages of nanofillers such as Zinc oxide (ZnO), Zirconium oxide (ZrO2), and Titanium dioxide (TiO2). Further, all the samples were tested for electromagnetic shielding effectiveness (SE). Further, these experimental results were compared with statistical and computational approaches such as the Gradient Descent Algorithm (GDA) and Response Surface Methodology (RSM). Based on the experimental results, it was observed that the PVDF nanofilm fabricated with 0.3wt.% of ZrO2, 0.5wt.% of TiO2and 0.3wt.% of ZnO nanofillers had achieved a maximum EMI SE of 11.4dB at X-band frequency of 8-12GHz.

show abstract

Electromagnetic shielding properties of cementitious composites containing carbon nanofibers, zinc oxide, and activated carbon powder

Cited by 21 publications

References 77 publications

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

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

Prediction Models of Shielding Effectiveness of Carbon Fibre Reinforced Cement-Based Composites against Electromagnetic Interference

A comparative analysis of flexible pvdf based smart films for advanced electromagnetic shielding applications using a machine learning approach

Contact Info

Product

Resources

About