Biopolymer Composites With High Dielectric Performance: Interface Engineering
01 Jan 2017-pp 27-128
TL;DR: In this article, the preparation and dielectric behavior of various biopolymer composites is presented, including metal nanoparticles and carbon-based nanofillers such as carbon nanotubes, graphene, etc.
Abstract: In recent years, there is a growing interest in studying the dielectric behavior of biopolymer composites due to their potential application as a dielectric material in various electronic devices such as microchips, transformers, and circuit boards. Conducting electroactive polymer composites have also been investigated for various potential applications which include biological, biomedical, flexible electrodes, display devices, biosensors, and cells for tissue engineering. In this chapter, the preparation and dielectric behavior of various biopolymer composites is presented. These biopolymer composites generally consist of nanoscale metal nanoparticles and carbon-based nanofillers such as carbon nanotubes, graphene, graphene oxide (GO), etc., dispersed into the polymer matrix. The physical and chemical properties of these fillers and their interactions with polymers have a significant effect on the microstructure and the final properties of nanocomposites. The biopolymer composites with excellent dielectric properties show great promise as an energy storage dielectric layer in high-performance capacitor applications such as embedded capacitors. This chapter highlights some of the examples of such biopolymer composites; their processing and dielectric behavior will be discussed in detail.
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References
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TL;DR: In this article, a proton-conducting gel polymer electrolyte based on gelatin plasticized with glycerol and containing acetic acid was investigated, characterized, and applied to electrochromic window.
Abstract: Proton-conducting gel polymer electrolytes based on gelatin plasticized with glycerol and containing acetic acid were investigated, characterized, and applied to electrochromic window. For glycerol contents varying from 7% to 48%, the conductivity of the uniform and predominantly amorphous gel electrolyte was found to follow a Vogel–Tamman–Fulcher behavior with the temperature. Typically, for the electrolyte chosen to make 7 × 2 cm2 electrochromic smart window with the configuration: glass/fluor-doped tin oxide (FTO)/WO3/gelatin electrolyte/CeO2–TiO2/FTO/glass and containing 28% of glycerol, the conductivities were found to be of the order of 5 × 10−5 S/cm at room temperature and 3.6 × 10−4 S/cm at 80 °C. The device was characterized by spectroelectrochemical techniques and was tested up to 10,000 cycles showing a fast coloring/bleaching behavior, where the coloring process was achieved in 10 s and the bleaching in 2 s. The transmission variation at the wavelength of 550 nm was about 15%. The cyclic voltammograms showed a very good reversibility of the cathodic/anodic processes, and the charge density was about 3.5 mC/cm2. The memory tests showed that the transmittance in the colored state increased by 8% in 90 min after removing the potential.
57 citations
TL;DR: In this article, thin sheets of polyallylamine (PAAm) and polyvinyl alcohol (PVA) blend were prepared by employing solution casting technique for potential membranes application.
Abstract: Thin sheets of polyallylamine (PAAm) and polyvinyl alcohol (PVA) blend were prepared by employing solution casting technique for potential membranes application The blends were characterized by Fourier transform infrared (FTIR) and 1H-NMR spectroscopy, scanning electron microscopy, thermogravimetric analysis, ultraviolet–visible spectroscopy, X-ray diffraction, and mechanical properties The zeta potential, conductivity and rheological properties of PAAm/PVA blends were also studied The FTIR spectrum reveals that the C–H asymmetric stretching vibration band of PVA at 2,928 cm−1 disappeared in all the blend samples Thermal stability of the blend membrane was better than pure polymers The crystallinity of the PAAm/PVA blends was decreased, which may be due to the entanglement of PAAm in to PVA chains, which is also responsible for the improvement in the mechanical properties of the blends Zeta potential decreases where as the conductivity increases as a function of temperature Hydrophilicity is improved by addition of PVA to PAAm, which may be due to hydroxyl group of PVA The blend solution shows non-Newtonian character of the liquid By applying shear stress, increase in the effect of rarefaction was observed The knowledge about the investigated parameters will be of vital importance for use of the blended material in membrane applications, especially where CO2 separation is in focus The membrane performance (separation properties) of the PAAm/PVA blended material is, however, not reported in the current article
57 citations
07 Jan 2013
TL;DR: In this paper, ZnO nanostructures were synthesized in one step reaction at 80℃ without any ext ra treat ments, and the dielectric constant properties of the films were measured with hp LCR meter.
Abstract: ZnO nanostructures were synthesized in one step reaction at 80℃ without any ext ra treat ments. (Zn(NO₃)₂.6H2O) and (NaOH) were used for synthesis. Production of ZnO nanostructures occurred relatively in short time. The obtained ZnO nanostructures were characterized by X-ray diffraction (XRD) and the atomic fo rce microscope AFM. Carbo xy methyleted PVA (CPVA) has been prepared and characterized. (CPVA) were co mposite with different ZnO nanoparticles concentrations. The composites are cast into films. The dielectric constant properties of the films were measured with hp LCR meter.
56 citations
TL;DR: The results of studying the wide range of properties of polymeric nanocomposites containing small doses of non-covalently bonded fullerene C60 which are of interest for modern technologies are presented in this paper.
Abstract: The results of studying the wide range of properties of polymeric nanocomposites containing small doses of non-covalently bonded fullerene C60 which are of interest for modern technologies are presented. The character of bonds between components of the composites and the possible reasons for improvement of the properties of the nanocomposites in comparison with pure polymers are considered.
55 citations