Synthesis And Characterization Of Zinc Oxide Nanoparticles Conjugated With Ferulic Acid And Investigation Of Optical Transition Properties Of Ferulic Acid Using Spectroscopic Techniques.

In this research, synthesis and characterization of zinc oxide nanoparticle (ZnO NP),rntransition optical properties, self-association properties and the binding of ferulic acidrn(FA) and ZnO NPs are investigated. ZnO NP was synthesized by sol-gel synthesisrnapproach and its optical, structural properties and its purity were investigated usingrnspectroscopic and microscopic techniques. Equal association constant (EK) dimerrnmodel, uorescence quenching method, the Stern-Volmer equation (model) and Van'trnHo_ equation were utilized for analyzing and interpreting data.rnOur _nding revealed that the synthesized ZnO NPs exhibits hexagonal wurtzite structurernwith lattice parameters a = 0:3250677 nm and c = 0:5212783 nm. It has averagerngrain size and band gap energy are 19:89 nm and 3:29 eV , respectively. It's surfacernconsists of O-H stretching, C-O-H bending, C-O stretching, O-H bending and Zn-Ornstretching vibration. The mechanism of quenching is static quenching. Bimolecularrnbinding constant decreases as temperature increases. Consequently, the uorescencernquenching was initiated by the formation of non-uorescent FA-ZnO NP complex. Enthalpyrnand entropy changes were found to be À€€53:301 kJ=mol and ð€€€76:27 J=Kmol.rnAccordingly, Van der Waals and hydrogen bond forces play a major role in FA andrnZnO NP interaction. The e_ciency of energy transfer between FA and ZnO NP wasrnobtained to be 52.31%. Increasing FA concentration causes the molecules to aggregaternand to shift the absorbance maxima. The enthalpy and entropy changes werernobtained to 10:703 kJ=mol and 110:02 (J=Kmol), respectively at all temperaturesrnand Gibbs free energy at the temperatures 298 K, 310 K and 320 K were ð€€€22:084,rnð€€€23:405 and ð€€€24:505 (KJ=mol), respectively.

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