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20223
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Subject: Physics × End date: 2022 × Start date: 2022 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Synthesis of tin disulphide (SnS2) and its characterization
    (CCSHAU, HISAR, 2022-07) Deepika Rani; Vinay Kumar
    The utilization of two dimensional materials in electronic and optical appliances is increasing day by day because of their excellent properties which can be utilized in various applications. The goal of the current study is to synthesize tin disulphide by low cost, wet chemical method at room temperature. To investigate its morphology, size, structure, and optical characteristics, different characterization techniques were used including FTIR, XRD, UV-Vis spectroscopy, PL spectroscopy, FESEM. FTIR spectra show Sn-S and S-S stretching vibrations which provide verification for the fabrication of SnS2. The band gap obtained from PL spectrum was found almost of the same order as obtained from UV-Vis spectrum. FESEM pictures represent the well-defined spherical morphology of the prepared SnS2. The XRD outcomes show the crystalline nature of the SnS2.
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    ThesisItemOpen Access
    Characterization of biochar prepared from coconut shell at different temperatures
    (CCS HAU, Hisar, 2022-07-22) Bhawna; Dahiya, Rita
    Pyrolysis process can be the solution to problems that arises due to the improper management of biowaste. This process might be used to produce valuable carbonaceous products like biochar. The present study is focused on the preparation of biochar from coconut shell at different temperatures by pyrolysis. The obtained biochar was characterized by using analytical techniques like FTIR, XRD, BET, FE-SEM and UV-Vis spectroscopy. The properties of biochar like ash content, EC, pH, carbon content and CEC were also determined using standard methods. The FTIR spectra of the prepared biochar confirmed the presence of aromatic carbon functional group in the biochar structure. From the XRD plots, amorphous structure of the biochar is confirmed. The results indicated that as the pyrolysis temperature increased, the amorphous organic phase in the biochar structure decreased. The FE-SEM images showed the porous structure of biochar prepared at a high temperature of 700 °C. The BET analysis showed that as the pyrolysis temperature increased, surface area as well as porosity of the biochar increased.
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    ThesisItemOpen Access
    Study on temperature dependent dielectric properties of edible oils for quality assessment
    (CCS HAU, Hisar, 2022-07-22) Meena; Paul Singh
    Edible oils adulteration has remained a global issue for years. Being an essential element of our daily diet, quality assessment of edible oils has become necessary. The present work focuses on use of dielectric properties for quality assessment of edible oils. The dielectric properties of edible oils (groundnut, mustard, sunflower and sesame) such as dielectric constant and electrical conductivity were investigated in a frequency range between 900 to 2700 MHz by using a dielectric assessment kit (DAK). With increase in palm oil adulteration, the dielectric constant of groundnut and mustard oil increased while for sunflower and sesame oil, it slightly decreased. For all the oil samples, electrical conductivity showed a slight change with increase in palm oil adulteration. The dielectric constant and electrical conductivity of oils were also analysed at different temperatures and at repetitive heating cycles. Both dielectric constant and electrical conductivity increased with increase in temperature and number of repetitive heating cycles.