Browsing by Subject "Microparticle synthesis"
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Item Open Access Microfluidic synthesis of polyhedral oligomeric silsesquioxane (POSS) based organic-inorganic hybrid microparticles(Bilkent University, 2019-09) Çalışkan, UmutcanUtilizing micro uidic systems inevitably changes tools used in chemistry due to advantages such as handling differential volume, controlled reaction environment, enhanced mixing performance, less time required to complete reaction. Hence micro uidic reactors become more popular among microparticle synthesis tools. This research work presents synthesis of organosilica nano-cage structures, namely Polyhedral oligomeric silsesquioxane (POSS) particles, based on organicinorganic hybrid microparticles by utilizing dispersion and emulsion polymerization methods. Firstly, poly(M-POSS) microparticles are synthesized via dispersion polymerization method by using continuous ow microreactors, one of which is operated on a hot plate and the other one has temperature controlled dual zone with embedded electrodes. Synthesized microparticles in microreactors are characterized in terms of morphology, thermal behavior and surface chemical structure. Effects of different parameters such as monomer, initiator and stabilizer amount are presented. Secondly, in a temperature controlled continuous ow micro uidic reactor with embedded thin film electrode, epoxy functional- POSS microparticles have been synthesized via emulsion polymerization method. Heater for the micro uidic reactor is designed by COMSOL Multiphysics and manufactured in cleanroom to achieve homogeneous temperature distribution. Effects of ow rate, temperature and concentration of monomers are presented. In addition, same micro uidic reactor without electrodes immersed in oil bath and polymerization is observed and results are compared with the electrode integrated reactor.Item Open Access One-pot synthesis of organic–inorganic hybrid polyhedral oligomeric silsesquioxane microparticles in a double-zone temperature controlled microfluidic reactor(Wiley Periodicals, Inc., 2019) Kibar, Güneş; Çalışkan, Umutcan; Erdem, E. Yegân; Çetin, BarbarosPolyhedral oligomeric silsesquioxane (POSS) particles are one of the smallest organosilica nano‐cage structures with high multifunctionality that show both organic and inorganic properties. Until now poly(POSS) structures have been synthesized from beginning with a methacryl‐POSS monomer in free‐radical mechanism with batch‐wise methods that use sacrificial templates or additional multisteps. This study introduces a novel one‐pot synthesis inside a continuous flow, double temperature zone microfluidic reactor where the methodology is based on dispersion polymerization. As a result, spherical monodisperse POSS microparticles were obtained and characterized to determine their morphology, surface chemical structure, and thermal behavior by SEM, FTIR, and TGA, respectively. These results were also compared and reported with the outcomes of batch‐wise synthesis.