Superparamagnetic nano-biocomposites for application as dielectric resonator antennas

Abstract

h i g h l i g h t s Nano-biocomposites for application as dielectric resonators are proposed. The synthesized magnetite has nanometric size and superparamagnetic character. All the nano-biocomposites also presented superparamagnetic behavior. All the nano-biocomposites have good rates of biodegradation in simulated soil. All the DRA's presented potential for technological use in broadband.

From Magneto-Dielectric Biocomposite Films to Microstrip Antenna Devices

“…The ε' values for all composites significantly decrease with increasing frequency, and BC-based composite films present the greatest variation. This behavior is in accordance to those observed in other works for collagen and some polysaccharides [15,50,51], which can arise from the inability of the dipoles to become biocomposite films or reorient themselves when the direction of applied field changes more quickly [52]. In this work, using a frequency range of 0.4-4.5 GHz, dipolar orientation is the predominant mechanism of dielectric polarization and the greatest reduction in ε' values for BC-based composites suggests the lower mobility of the BC matrix in comparison to Ch and Col, as well as the dielectric relaxation process being related to the increase in tan δ values.…”

Advances in Nanomaterials Based on Cashew Nut Shell Liquid

“…A prepolymer (resol) was synthesized by mixing CA with an aqueous solution of formaldehyde, which was then mixed with epoxy resin as a modifier to prepare a thermosetting plastic. The polymer was mixed with spongy gourd fiber as a mechanical strengthening agent, and with different amounts of magnetite nanoparticles, which conferred specific superparamagnetism properties [19]. After complete homogenization, a crosslinking agent was added and submitted to the curing process.…”

“…ZnO nanostructures impregnated with CA-H 2 Pp and CA-CuPp Heterogeneous photocatalysts for water purification [16] Nano-biocomposites consisting of CA/formaldehyde/epoxy resin polymer added with spongy gourd fiber/magnetite nanoparticles Dielectric resonators [19] Sheet-like nano-biocomposites consisting of CA thermosetting resin/cellulose nanofibrils/expanded graphite nanoplatelets Coating systems and automotive applications [20] CA-benzenesulfonic acid as a dopant for polyaniline nanofibers, nanorods, nanospheres, and nanotubes…”