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Preparation of Composite Particles by Forming Pickering Emulsion Followed by drying-in-liquid and Effect of Stepwise Addition of Solid Powder on Structure of Composite Particles

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Materials Sciences and Applications 2013年第12期4卷 786-793页

作者： Yasushi Akutsu Yoshinari Taguchi Masato Tanaka Graduate School of Science and Technology Niigata University Niigata Japan

It was tried to prepare composite particles made of polymer and two kinds of solid powders by forming Pickeringemulsion followed by the drying-in-liquid method and to investigate how the stepwise addition of solid powders affected the contained ratio and adhesion ratio of solid powders and the structure of composite particles. Limonene oil dissolving expanded polystyrene and ethylene glycol were adopted as the dispersed phase and the continuous phase, respectively. Magnetite and titanium dioxide were used as solid powders. Magnetite was added before or after formation of the (O/W) dispersion. Titanium dioxide was added at the various elapsed times from addition of magnetite. Titanium dioxide adhered only on the surface of composite particles irrespective of addition time. At the earlier addition of both solid powders, the surface-covering type composite particles were prepared. At the latter addition of titanium dioxide, a part of magnetite adhered on the surface and the remainder was dispersed into composite particle.

关键词： Composite Particles Pickering Emulsion drying-in-liquid Method liquid-liquid Dispersion Magnetite Titanium Dioxide

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Preparation of Composite Particles Made of Biodegradable Polymer and a Few Additives with Phase Separation Followed by drying-in-liquid

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Journal of Encapsulation and Adsorption Sciences 2015年第1期5卷 11-20页

作者： Mitsuru Kutsuwada Yoshinari Taguchi Masato Tanaka Graduate School of Science and Technology Niigata University Niigata Japan

It was tried to prepare the biodegradable composite particles by the phase separation method followed by the drying-in-liquid method. The composite particles were made of poly-ε-caprolac-tone, quaternary ammonium, carbon black and wax. In the experiment, acetone and water were selected as a good solvent and a poor solvent for poly-ε-caprolactone, quaternary ammonium and wax, respectively. The composite particles were prepared by changing the surfactant species and their concentration, the feeding velocity of water and the weight ratio of poly-ε-caprolactone with larger molecular weight to one with smaller molecular weight. The composite particles with the inner structure in which carbon black, quaternary ammonium and wax were coated well with poly-ε-caprolactone could be prepared by the preparation method presented in this study. The structure and the mean diameter of composite particles were strongly affected by the feeding velocity of water. The higher the feeding velocity of water, the larger the mean diameter of composite particles. The mean diameter was drastically decreased with the surfactant concentration and increased with the added amount of poly-ε-caprolactant with larger molecular weight.

关键词： Biodegradable Composite Particles Phase Separation drying-in-liquid Poly-ε-Caprolactone Microencapsulation

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