Synthesis and Characterization of Zinc Oxide Nanoparticles Conjugated With Ferulic Acid and Investigation of Optical Transition Properties of Ferulic Acid Using Spectroscopic Techniques.
| dc.contributor.advisor | Gholap, Ashok (Professor) | |
| dc.contributor.advisor | Mesf in, Belayneh (PhD) | |
| dc.contributor.author | Kassa, Yirga | |
| dc.date.accessioned | 2021-07-23T06:38:56Z | |
| dc.date.accessioned | 2023-11-09T04:21:30Z | |
| dc.date.available | 2021-07-23T06:38:56Z | |
| dc.date.available | 2023-11-09T04:21:30Z | |
| dc.date.issued | 2020-10-16 | |
| dc.description.abstract | In this research, synthesis and characterization of zinc oxide nanoparticle (ZnO NP), transition optical properties, self-association properties and the binding of ferulic acid (FA) and ZnO NPs are investigated. ZnO NP was synthesized by sol-gel synthesis approach and its optical, structural properties and its purity were investigated using spectroscopic and microscopic techniques. Equal association constant (EK) dimer model, uorescence quenching method, the Stern-Volmer equation (model) and Van't Ho_ equation were utilized for analyzing and interpreting data. Our _nding revealed that the synthesized ZnO NPs exhibits hexagonal wurtzite structure with lattice parameters a = 0:3250677 nm and c = 0:5212783 nm. It has average grain size and band gap energy are 19:89 nm and 3:29 eV , respectively. It's surface consists of O-H stretching, C-O-H bending, C-O stretching, O-H bending and Zn-O stretching vibration. The mechanism of quenching is static quenching. Bimolecular binding constant decreases as temperature increases. Consequently, the uorescence quenching was initiated by the formation of non-uorescent FA-ZnO NP complex. Enthalpy and entropy changes were found to be 53:301 kJ=mol and 76:27 J=Kmol. Accordingly, Van der Waals and hydrogen bond forces play a major role in FA and ZnO NP interaction. The e_ciency of energy transfer between FA and ZnO NP was obtained to be 52.31%. Increasing FA concentration causes the molecules to aggregate and to shift the absorbance maxima. The enthalpy and entropy changes were obtained to 10:703 kJ=mol and 110:02 (J=Kmol), respectively at all temperatures and Gibbs free energy at the temperatures 298 K, 310 K and 320 K were 22:084, 23:405 and 24:505 (KJ=mol), respectively. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/27320 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Synthesis and Characterization | en_US |
| dc.subject | Zinc Oxide Nanoparticles | en_US |
| dc.subject | Conjugated | en_US |
| dc.subject | Ferulic Acid | en_US |
| dc.subject | Investigation of Optical | en_US |
| dc.subject | Transition Properties | en_US |
| dc.subject | Ferulic Acid Using | en_US |
| dc.subject | Spectroscopic Techniques | en_US |
| dc.title | Synthesis and Characterization of Zinc Oxide Nanoparticles Conjugated With Ferulic Acid and Investigation of Optical Transition Properties of Ferulic Acid Using Spectroscopic Techniques. | en_US |
| dc.type | Thesis | en_US |