Browsing by Author "Mergen, Ömer Bahadır"
A comparison of fluorescence and UV-visible spectrometry techniques for thermal phase transitions of agarose gels Authors:Arda, Ertan; Kara, Selim; Mergen, Ömer Bahadır; Pekcan, Önder
Publisher and Date:(Springer, 2015)In this study thermoreversible phase transitions of high (HMP) and low (LMP) melting point agarose gels were investigated by using the UV-vis and fluorescence spectroscopy techniques. Pyranine was added to the aqueous solution of agarose as a fluorescence-probe. Transmitted light (I (tr)) and fluorescence emission (I (fl)) intensities from the gel samples with different agarose concentrations were monitored during the heating (gel-sol) and cooling (sol-gel) processes. For the both techniques gel-sol ...
Authors:Mergen, Ömer Bahadır; Arda, Ertan; Kara, Selim; Pekcan, Önder
Publisher and Date:(Wiley, 2019)In this study the effects of graphene nanoplatelet (GNP) doping on the optical parameters (absorption coefficient alpha and extinction coefficient k) and the optical transition energies (optical band gap and Urbach energies) of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. PMMA/GNP composite films with various GNP mass fractions were prepared by spin coating technique. The absorbance (A) changes of the prepared composites were measured by using UV-Vis ...