رسائل ماجيستير
English
2023
Silicon dioxide nanoparticles impact on the Physical Properties of Polymer Nanocomposites
اثار اقبال عليوي عبد الشهيد, احسان ضياء جواد البيرماني
كلية التربية للعلوم الصرفة-جامعة بابل · العراق
Silicon oxide nanoparticles (SiO2 NPs) attracted nanomaterials for tuning the structure, characterizations, band gap, and dielectric properties. This investigation focused on the impact of the SiO2 on newly ternary blend polymers to fabricate new nanocomposites. Polyacrylamide (PAAm), polyvinyl alcohol (PVA), and polyvinyl pyrrolidone (PVP) were mixed with different ratios and loaded with different ratios of SiO2 (x = 0.00, 0.01, 0.03, and 0.05) wt. % applying green-easy solution-casting procedure. The study was divided into five chapters, chapter one focused on the introduction and literature survey, chapter two explained the thermotical parts, chapter three explained the experimental part, chapter four presented and discussed the results, and finally, chapter five summarized the conclusions and future works. Different characterizations used to investigate these new nanomaterials’ X-ray diffraction (XRD), infrared Fourier transform spectrometer (FTIR), optical microscopy (OM), field emission scanning electron microscope (FE-SEM), UV visible light spectrometer (UV visible light spectrometer), AC ammeter and anti-efficacy used for bacteria to examine samples and a Giger counter to detect susceptibility to ionizing radiation absorption. FTIR spectra showed a significant interaction between the polymer mixture and the nanomaterial. X-ray diffraction (XRD) patterns of the samples showed a wide peak between10 o- ~50o. The OM and FE-SEM images showed a homogeneous surface and an excellent distribution of nanoparticles in the mixture. The optical properties showed enhancement absorption from 0.73 to 0.91at 200 nm, and the energy gap improved from 4.8 to 3.4 eV for allowed indirect transition and from 4.2 to 3.1 eV for forbidden indirect transition. The absorption coefficient refractive index, extinction coefficient, real and imaginary dielectric constant, and optical conductivity improved with increasing the concentration of
IV SiO2 NPs, while the transmittance reduced with increasing concentration of SiO2NPs. The dielectric constant and loss improved from 0.20 to 0.53, and outstanding enhancement was presented in the electrical conductivity. SiO2 nanoparticles have shown significant improvement in the inhibition zone of antibacterial activity from 0.00 to 24 mm of S. aureus and 23 mm of coli strip compared to the triple mixture of polymers. These nano compounds are promising for different applications and the results of gamma radiation shield applications for nano compounds have emerged in low transport radiation with increased SiO2 concentrations. Attenuation factors increase with the increased concentration of SiO2 nanoparticles. These nanocomposites are promising for solar cells, optoelectronics, biology applications, and light shielding application