scholarly journals NiFe2O4 Nanoparticles Synthesized by Dextrin from Corn-Mediated Sol–Gel Combustion Method and Its Polypropylene Nanocomposites Engineered with Reduced Graphene Oxide for the Reduction of Electromagnetic Pollution

ACS Omega ◽  
2019 ◽  
Vol 4 (26) ◽  
pp. 22069-22081 ◽  
Author(s):  
Raghvendra Singh Yadav ◽  
Ivo Kuřitka ◽  
Jarmila Vilcakova ◽  
Michal Machovsky ◽  
David Skoda ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Sol Gel ◽  
Combustion Method ◽  
Polypropylene Nanocomposites ◽  
Reduced Graphene ◽  
Gel Combustion ◽  
Nife2o4 Nanoparticles ◽  
Electromagnetic Pollution ◽  
Gel Combustion Method

scholarly journals Polypropylene Nanocomposite Filled with Spinel Ferrite NiFe2O4 Nanoparticles and In-Situ Thermally-Reduced Graphene Oxide for Electromagnetic Interference Shielding Application

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 621 ◽  
Author(s):  
Yadav ◽  
Kuřitka ◽  
Vilčáková ◽  
Machovský ◽  
Škoda ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Interference ◽  
Oxide Content ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Polypropylene Nanocomposites ◽  
Reduced Graphene ◽  
Nife2o4 Nanoparticles

Herein, we presented electromagnetic interference shielding characteristics of NiFe2O4 nanoparticles—in-situ thermally-reduced graphene oxide (RGO)—polypropylene nanocomposites with the variation of reduced graphene oxide content. The structural, morphological, magnetic, and electromagnetic parameters and mechanical characteristics of fabricated nanocomposites were investigated and studied in detail. The controllable composition of NiFe2O4-RGO-Polypropylene nanocomposites exhibited electromagnetic interference (EMI) shielding effectiveness (SE) with a value of 29.4 dB at a thickness of 2 mm. The enhanced EMI shielding properties of nanocomposites with the increase of RGO content could be assigned to enhanced attenuation ability, high conductivity, dipole and interfacial polarization, eddy current loss, and natural resonance. The fabricated lightweight NiFe2O4-RGO-Polypropylene nanocomposites have potential as a high performance electromagnetic interference shielding nanocomposite.

scholarly journals Superparamagnetic ZnFe2O4 Nanoparticles-Reduced Graphene Oxide-Polyurethane Resin Based Nanocomposites for Electromagnetic Interference Shielding Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1112
Author(s):  
Raghvendra Singh Yadav ◽  
Anju ◽  
Thaiskang Jamatia ◽  
Ivo Kuřitka ◽  
Jarmila Vilčáková ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Waves ◽  
Spinel Ferrite ◽  
Ferrite Nanoparticles ◽  
Resin Matrix ◽  
Polyurethane Resin ◽  
Reduced Graphene ◽  
Znfe2o4 Nanoparticles ◽  
Electromagnetic Pollution

Superparamagnetic ZnFe2O4 spinel ferrite nanoparticles were prepared by the sonochemical synthesis method at different ultra-sonication times of 25 min (ZS25), 50 min (ZS50), and 100 min (ZS100). The structural properties of ZnFe2O4 spinel ferrite nanoparticles were controlled via sonochemical synthesis time. The average crystallite size increases from 3.0 nm to 4.0 nm with a rise of sonication time from 25 min to 100 min. The change of physical properties of ZnFe2O4 nanoparticles with the increase of sonication time was observed. The prepared ZnFe2O4 nanoparticles show superparamagnetic behavior. The prepared ZnFe2O4 nanoparticles (ZS25, ZS50, and ZS100) and reduced graphene oxide (RGO) were embedded in a polyurethane resin (PUR) matrix as a shield against electromagnetic pollution. The ultra-sonication method has been used for the preparation of nanocomposites. The total shielding effectiveness (SET) value for the prepared nanocomposites was studied at a thickness of 1 mm in the range of 8.2–12.4 GHz. The high attenuation constant (α) value of the prepared ZS100-RGO-PUR nanocomposite as compared with other samples recommended high absorption of electromagnetic waves. The existence of electric-magnetic nanofillers in the resin matrix delivered the inclusive acts of magnetic loss, dielectric loss, appropriate attenuation constant, and effective impedance matching. The synergistic effect of ZnFe2O4 and RGO in the PUR matrix led to high interfacial polarization and, consequently, significant absorption of the electromagnetic waves. The outcomes and methods also assure an inventive and competent approach to develop lightweight and flexible polyurethane resin matrix-based nanocomposites, consisting of superparamagnetic zinc ferrite nanoparticles and reduced graphene oxide as a shield against electromagnetic pollution.

Kinetics of nanocrystalline MgO growth by the sol–gel combustion method

2014 ◽  
Vol 185 ◽  
pp. 86-91 ◽  
Author(s):  
Alexandre R. Bueno ◽  
Renata F.M. Oman ◽  
Paula M. Jardim ◽  
Nicolás A. Rey ◽  
Roberto R. de Avillez
Keyword(s):  
Sol Gel ◽  
Combustion Method ◽  
Gel Combustion ◽  
Kinetics Of ◽  
Gel Combustion Method ◽  
Nanocrystalline Mgo

Synthesis of nanocrystalline Ca2Cu2Fe12O22 Y-type hexaferrites by the sol–gel combustion method in metal nitrates system

2018 ◽  
Vol 526 (1) ◽  
pp. 187-192 ◽  
Author(s):  
S. B. Bankar ◽  
N. S. Meshram ◽  
N. N. Sarkar ◽  
H. S. Ahamad ◽  
S. J. Dhobale ◽  
...  
Keyword(s):  
Sol Gel ◽  
Combustion Method ◽  
Metal Nitrates ◽  
Gel Combustion ◽  
Gel Combustion Method

Low temperature synthesis of wollastonite using sol–gel combustion method: In vitro bioactivity evaluation

2019 ◽  
Vol 33 (10) ◽  
pp. 1950081 ◽  
Author(s):  
Madeeha Riaz ◽  
Rehana Zia ◽  
Snudia Aslam ◽  
Alliya Qamar ◽  
Tousif Hussain ◽  
...  
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Calcium Nitrate ◽  
Combustion Method ◽  
Calcium Nitrate Tetrahydrate ◽  
In Vitro Bioactivity ◽  
Nitrate Tetrahydrate ◽  
Gel Combustion ◽  
Gel Combustion Method

In this paper, low temperature, economical sol–gel combustion method was adopted to synthesize wollastonite ceramic. Calcium nitrate tetrahydrate and tetraethyl orthosilicate were taken as source for Ca and Si, while citric acid and nitric acid were used as chelating/combustion agents. The yielded powder calcined at 600[Formula: see text]C for 4 h was characterized by FTIR, XRD and SEM techniques. Results showed that the citrate combustion method was the most efficient method to prepare wollastonite at low temperature. Moreover, in vitro bioactivity test performed in simulated body fluid (SBF) showed good bioactivity of synthesized wollastonite ceramics.

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