Preparation and characterization of advanced spinel ferrite nanocomposites for electromagnetic applications

The recent developments in electronic and information transmission technology, has upgraded the life of society. Different technologies associated with electromagnetic (EM) wave such as fifth generation (5G) communication has significantly improved and enhanced people’s lives. However, advancement in communication and electronic devices have also increased the EM intereference (EMI) which deterioties the functionality of electronic devices and also influences human-health. To minimize the EMI, Polymer nanocomposites are a potential candidate to be utillized as an EMI shielding material owing to the flexibility, mechanical properties, ease processing, light-weight and other tailored properties. However, polymer itself is non-magnetic and therefore limiting their application for EMI shielding. A high-performance EM wave absorber should possess strong dielectric and magnetic loss. Recently, spinel ferrites (MFe2O4, M = Zn, Co etc.) have drawn significant attention due to their considerable magnetic properties and chemical stability, to be used as a filler inside the polymer composites for EMI shielding application. Moreover, secondary filler such as graphite and reduced graphene oxide are also ideal choice to be utilized as a conducting filler. In this thesis, various spinel ferrite nanoparticles were synthesized using sonochemical approach. Further, the synthesized spinel ferrite nanoparticles were incorporated along with the conducting filler such as commercially available graphite or synthesized reduced graphene oxide (rGO) in thermoplastic polyurethane (TPU) polymer matrix. This work was focussed on the development of the various polymer nanocomposite systems (a) Zn2+ substituted cobalt ferrite nanoparticles along with reduced graphene oxide in TPU matrix (b) Cu2+ substituted cobalt ferrite nanoparticles with reduced graphene oxide in TPU matrix (c) optimization of wt% of the conducting graphite and magnetic cobalt ferrite nanoparticles in TPU matrix. Furthermore, the developed nanocomposites were utilized for EMI shielding applications. The EM parameters such as complex permittivity and permeability, dielectric losses, magnetic losses, electrical conductivity were also investigated to study their dependence on the EMI shielding mechanism of the developed polymer nanocomposites. Impedance matching coefficient and attenuation constant helped in predicting the EMI shielding mechanism of the prepared polymer nanocomposites.

ISBN:	978-80-7678-291-4
EAN:	9788076782914
Počet stran	52 stran
Datum vydání	07. 11. 2024
Pořadí vydání	První
Jazyk	anglický
Vazba	e-kniha - pdf
Autor:	Anju Deswal
Nakladatelství	Univerzita Tomáše Bati ve Zlíně
Tématická skupina	999 - nezařazeno
	Neprodejná publikace. Publikaci je možné poptávat zde: Volně dostupné na http://hdl.handle.net/10563/56790