OPTIMIZATION OF SYNTHESIS PARAMETERS FOR LEAD OXIDE NANOPARTICLES USING RESPONSE SURFACE METHODOLOGY
Akbay, İsmail Kutlugün | Genç, Rükan | Özdemir, Tonguç
Nano-sized lead oxide has useful applications that can be used in industry. In this study, the synthesis parameters were optimized using response surface methodology and ANOVA study was also carried out. Reaction temperature, sodium hydroxide and lead (II) acetate concentration were studied as the factors and the particle size was selected as the response variable. The modification was lead to increase the adequate precision of the model. Close results between R2 (correlation coefficient) and R2adj showed the accuracy of the model. The optimum results of the study were found 14.89 M NaOH concentration, 0.87 M Pb(II)Ac and reaction temperature of 88.56 °C. The particle size of lead II oxide was found to be 19.75 nm under optimum parameters.
N-vinylcaprolactam-based temperature and pH-sensitive graft hydrogels for controlled drug release of 5-FU: a comprehensive study on synthesis, characterization, and release kinetics
İsmail Kutlugün AKBAY | Tonguç ÖZDEMİR
Stimuli-responsive polymers can be used for various purposes due to their amazing properties within the context of controlled release systems. In this study, the aim was to prepare hydrogels that are stimulus-responsive to temperature and pH and utilize them in drug release investigations. N-Vinyl caprolactam-based polymers were synthesized and optimized based on the swelling ratio data. Both temperature and pH sensitivity, along with their respective transition values, were determined. The best sample was selected based on 5-FU encapsulation efficiency. To enhance the swelling ratio and encapsulation values, different amounts of poly-(ethylene glycol) were added to improve water swelling ratio and 5-FU release properties. All obtained samples were characterized using water swelling ratio,...
ACCUMULATION OF RECYCLED WASTE TYRE WITHIN DIFFERENT RUBBERS: A KINETIC STUDY
Akbay, İsmail Kutlugün | Özdemir, Tonguç
Waste tyres around the world are increased severely in the last century. The accumulation of waste tyre within poly dimethyl siloxane (silicone) and ethylene–propylene–diene monomer rubber (EPDM) rubbers were examined. The moving die rheometer were used for the kinetic analysis of the samples. The MDR results showed that the silicone sample that has 5% waste tyre content has the better rheological results. Kinetic study examination of both EPDM and silicone rubber were done according to non-linear curve fitting model. The fitting model were conducted as Kamal-Sourour Model. In addition, the fitted model was corrected with fourth order Runge-Kutta model. Moreover, activation energy of both samples were calculated from Arrhenius plot for both rubbers. For EPDM case, it was found 99 kJ/mole a...