One-pot synthesis of hydrophilic and hydrophobic fluorescent carbon dots using deep eutectic solvents as designer reaction media
Dogan Calhan, Selda | Alas, Melis Ozge | Asik, Muge | Genc, Rukan
Carbon dots are often synthesized in the presence of a carbon source and passivating agents in which they are crucial for an enhanced fluorescence. The solvent choice and/or combination to be used in the synthesis of these nanoparticles can influence their surface chemical composition, morphology, and fluorescence properties. In this study, highly fluorescent carbon dots were synthesized using deep eutectic solvents of different compositions as green solvent media and doping agent. Resulting carbon dots were then separated by their hydrophilicity/hydrophobicity using a three-phase solvent system (water/ acetone/chloroform) and compared with traditional centrifugation-based separation method. Carbon dots with a size below 20 nm and quantum yield reaching 50% were obtained. Many properties o...
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.