Biyoinformatik ve Genetik Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12469/46

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Citation - WoS: 3
Citation - Scopus: 4
Elasticity Study of Paam-Kappa C Composite Prepared in Various Kappa C Content and Measured at Several Temperatures
(Polish Acad Sciences Inst Physics, 2015) Evingür, Gülşen Akin; Pekcan, Önder
Polyacrylamide (PAAm)-kappa carrageenan (kappa C) composite gels were prepared via free radical crosslinking copolymerization with various (w/v) percentages of kappa C in the range between 0.5 and 3 (w/v)% of kappa C . Elasticity properties such as stress strain and compressive elastic modulus S of these composite gels were studied in various kappa C content and at several temperatures. The content and temperature dependence of the compressive elastic modulus S of the swollen PAAm-kappa C composite gels due to volume phase transition were produced by using tensile testing technique. It is understood that the compressive elastic modulus was found to decrease up to 1 (w/v)% of kappa C and then increase by increasing kappa C contents at constant temperatures. The composite preserves the ability to undergo the volume phase transition and its compressive elastic modulus is found to be strongly dependent on the kappa C content and temperature. It is observed that the compressive elastic modulus increased when temperature is increased up to 40 degrees C and then decreases below this temperature for all composite gels. However PAAm-kappa C composite gel presented lower values for the compressive elastic modulus showing a minima at 40 degrees C for 1 (w/v)% of kappa C content gel.
Citation - WoS: 2
Citation - Scopus: 2
Fractal Features and Structural Morphological Optical Characteristics of Sol-Gel Derived Silica Nanoparticled Thin Films
(Polish Acad Sciences Inst Physics, 2018) Uysal, Bengü Özuğur; Pekcan, Önder
Nanostructured silica films using a simple and effective sol-gel spin coating technique were synthesized and the influence of ammonia/sol ratios on the particle size and thickness of this film was investigated. In addition fractal dimensions of the prepared films were determined using the scattering response technique. The samples were characterized by atomic force microscopy and UV-vis spectroscopy. Comparing optical method and image analysis of atomic force microscopy micrographs the fractal dimension of silica nanoparticled thin films was determined. The fractal dimensions of the films verified by atomic force microscopy analysis were found to be around 2.03 which is very close to the values (2.0358 2.0325 and 2.0335) obtained using optical method. As a result of these findings precise determination of the nanoparticled silica thin films fractal dimension using both optical and surface analysis methods was realized.
Citation - WoS: 4
Citation - Scopus: 4
Paam-Kappa Carrageenan Composites: Drying and Swelling With Various Kappa Carrageenan Contents
(Polish Acad Sciences Inst Physics, 2012) Akın-Evingür, Gülşen; Pekcan, Önder
The purpose of this study is to discuss the role of kappa-carrageenan (kappa-car) in the drying and swelling of polyacrylamide (PAAm)-kappa-car composite. The fluorescence intensity of pyranine increased and decreased as drying and swelling time were increased respectively for all samples. The desorption coefficient D-d decreased as kappa-car contents were increased for a given temperature during drying. However cooperative diffusion coefficient D-s increased as kappa-car contents were increased during swelling at a given temperature.

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Browsing Biyoinformatik ve Genetik Bölümü Koleksiyonu by Journal "Acta Physica Polonica A"