Optical Dispersion: Variation of Refractive Index of Polypyrrole and SnO2 Nanocomposite Thin Film with Incident Wavelength | Chapter 4 | Fundamental Research and Application of Physical Science Vol. 7

 In this study, we examined the dielectric properties of nanocomposite thin films utilizing surface plasmon resonance. The aim search out understand how the excitement wavelength influences the refractive index dispersion curve and to decide the suitability of these films for differing applications. Our findings desire that these nanocomposite thin films exhibit promising dielectric features and could be valuable in optical and photoelectric devices. The alternative in wavelength shows dispersion of the dielectric characteristics of the prepared thin films. The science of surface plasmon resonance (SPR) has happened mostly used in angular interrogation way using monochrome laser light at a established incident awareness. This in turn produce information about the complex dielectric constant and refractive index of the dielectric material painted above the metal surface. In the communication, we present the refractive index dispersal of the prepared composite thin film. A crimson laser light of intuitiveness approximately 633 nm and TM polarisation is exploited to educate the sample surface, and the corresponding reflectivity ranges are recorded for one spectrometer. A complete SPR reflectance curve can be noticed by varying the angular plasmonic pairing conditions, and a complete reflectivity surface R(θ, λ) maybe measured. After weighing the experimental SPR dossier, the complex dielectric constant and refractive index are determined by fitting them with the hypothetical Fresnel equations. In order to do this, a sample of polypyrrole (PPy) and container oxide (SnO2) nanocomposite thin films is groomed by sol-coagulate and spin coating techniques over a golden-coated crystal. The dielectric properties were checked by varying the excitement wavelength of the beginning in the visible range. The refractive index dispersion curve was planned and fitted accompanying the Sellmeier equation to resolve.

Author(s) Details:

Ajay Pratap Singh Gahlot,
Deshbandhu College, University of Delhi, India.

Please see the link here: https://stm.bookpi.org/FRAPS-V7/article/view/11119

Dielectric Spectroscopy as a Tool to Distinguish Starch and Flour | Chapter 7 | Recent Progress in Science and Technology Vol. 6

 The present chapter aims to determine whether dielectric spectroscopy can be used to distinguish starch and flour. It is a powerful experimental tool that allows real-time, in-line measurement with simple calibration. It is successfully used in food industry, agriculture, polymer science, human health, medicine, textile etc. Particle size analysis done by sieve method indicate that corn flour do not have sigmoidal profile. Both for flour and starch samples, the dielectric properties values increase abruptly for 50oC and above. It was observed that dielectric constant of both starch and corn decreases in selected frequency range however corn starch have higher values. Dielectric spectroscopy may serve as a fast and reliable tool for distinguishing and detecting these two, thereby avoiding quality concerns or any potential misapplication of one in place of the other in the food industry.

Author(s) Details:

Prem Pankaj,
Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur, Punjab 148106, India.

Prabhdeep Kaur,
Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur, Punjab 148106, India.

Kuldip Singh Mann,
Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur, Punjab 148106, India.

Please see the link here: https://stm.bookpi.org/RPST-V6/article/view/9869

Determination of Thermal and Dielectric Properties of linear p-substituted Phenol with Methylene Bridge | Chapter 8| Progress in Chemical Science Research Vol. 2

The current study emphasises structural analysis, thermal analysis from TG thermogram to determine activation energy, and the impact of p- substituted groups on dielectric constant/loss. From p-substituted phenol with Methylene Bridge, such as -Cl, -COOH, -NO2, etc., a novel approach is employed to create new linear polymers, which have been studied by IR, NMR, and TGA methods. Calculate thermal degradation at various temperatures with respect to mass loss. We have researched the structural analysis using TGA with regard to mass loss at various temperatures in relation to thermal stability and mass loss. These polymers had a low percentage of unreachable methylene groups and a high molecular weight. These samples of polymers were perfectly characterised by the TGA technique.

Author (s) Details

Y. F. Khobragade
Department of Chemistry, Government College of Engineering, Chandrapur, India.

S. A. Petkar
Department of Chemistry, Government Polytechnic, Sadar, Nagpur, India.

T. D. Kose
Department of Chemistry, Art, Commerce & Science College, Tukum, Chandrapur, India.

N. H. Chahande
Department of Chemistry, Vpmks Arts, Commerce & Science College, Kinhavali (M.S.), India.

View Book :- https://stm.bookpi.org/PCSR-V2/article/view/7571

Half Doped Mg-Zn Aluminates: A Study of Their Feasibility in Advanced Applications | Chapter 7 | Research Trends and Challenges in Physical Science Vol. 2

 Spinel materials based on MgAl2O4 are technologically essential materials, and their ability to be modified in various ways makes them an attractive material from an application standpoint. We present Mg0.5-xMxZn0.5Al2O4 aluminates produced by a high temperature solid state reaction method (x = 0, 0.05 and M = Co, Ni, Cu). The structural, optical, and electrical characteristics of these aluminate materials were studied. The sample crystallisation into the cubic phase is inferred using Rietveld refinement of XRD data (Fd-3m). The presentation of distinct absorption bands in the Fourier transform infrared (FTIR) and Raman inelastic scattering spectral analysis validates the anticipated sample construction. At room temperature, dielectric analysis demonstrates that these materials have a low dielectric constant of a few hundreds and a convincingly low loss value. The optical bandgap (Eg) was observed to decrease from 5.17eV for pristine to 3.9eV for Cu2+ doping using the UV-Vis characterization approach. Electrical modulus and impedance behaviour are also discussed in order to better understand the conduction process and factors that influence it. The electrical polarisation at various field values is also presented. In light of Jonscher's law, we also focused on morphology, composition, and ac conductivity.

Author(S) Details

Mohd. Saleem
Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India.

View Book:- https://stm.bookpi.org/RTCPS-V2/article/view/4493

Investigating the Effect of Temperature and Phase on Properties of Metal Pseudobrookite | Chapter 7 | Challenges and Advances in Chemical Science Vol. 3

 Spin glass behaviour, thermal microcracking, magnetic roughness, and high resistivity are all characteristics of iron titanate, a metal pseudobrookite. Pseudobrookite is a polycrystalline pseudobrookite that has a wide range of uses. The electrical resistivity and dielectric properties of pure iron titanates prepared with the rutile form of titanium oxide and sintered at two temperatures, 1000oC and 1250oC, as well as pure iron titanates prepared with the anatase form of titanium oxide and sintered at 1250oC, are compared in this paper as a function of temperature and relaxation spectra. The iron titanates are manufactured with A.R. grade oxides and a traditional ceramic process. The formation of a single phase is confirmed by XRD and FTIR studies. All of the samples are pseudobrookites with orthorhombic unit cells in terms of structure. For the pseudobrookite made from rutile TiO2, study of the relaxation spectra reveals the existence of space-charge, which increases with sintering temperature. According to the research, pseudobrookite produced from anatase TiO2 has worse dielectric and electric properties at lower frequencies (1 kHz) and exhibits substantial hysteresis, indicating delayed microcrack healing. The impact of structural alterations on resistivity, dielectric constant, and dielectric loss are examined.

Author (S) Details

S. S. Gurav
Department of Physics, K. E. S. Anandibai Pradhan Science College, Nagothane – 402106 (M.S.), India.

S. V. Salvi
Department of Physics, K. E. S. Anandibai Pradhan Science College, Nagothane – 402106 (M.S.), India.

View Book :- https://stm.bookpi.org/CACS-V3/article/view/2953