Insight into peroxidase and polyphenol oxidase mimic activity of spinel ferrite nanoparticles and their GO composites

Author(s):  
Vibha Verma ◽  
Manpreet Kaur ◽  
Sucheta Sharma
2021 ◽  
pp. 159334
Author(s):  
Harun Bayrakdar ◽  
Orhan Yalçın ◽  
Songül Özüm ◽  
Uğur Cengiz

2021 ◽  
Vol 272 ◽  
pp. 115331
Author(s):  
M. Nasri ◽  
C. Henchiri ◽  
R. Dhahri ◽  
J. Khelifi ◽  
H. Rahmouni ◽  
...  

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1112
Author(s):  
Raghvendra Singh Yadav ◽  
Anju ◽  
Thaiskang Jamatia ◽  
Ivo Kuřitka ◽  
Jarmila Vilčáková ◽  
...  

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.


2010 ◽  
Vol 322 (21) ◽  
pp. 3396-3400 ◽  
Author(s):  
Jianjun Li ◽  
Hongming Yuan ◽  
Guodong Li ◽  
Yanju Liu ◽  
Jinsong Leng

2018 ◽  
Vol 40 ◽  
pp. 773-783 ◽  
Author(s):  
Raghvendra Singh Yadav ◽  
Ivo Kuřitka ◽  
Jarmila Vilcakova ◽  
Jaromir Havlica ◽  
Lukas Kalina ◽  
...  

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