Functionalized Raspberry-Like Microparticles obtained by Assembly of Nanoparticles during Electrospraying

Eun Chul Cho; Yoon Kyun Hwang; Unyong Jeong
June 2014
Bulletin of the Korean Chemical Society;2014, Vol. 35 Issue 6, p1784
Academic Journal
The present study suggests a novel method to produce raspberry-like microparticles containing diverse functional materials inside. The raspberry-like microparticles were produced from a random assembly of uniformly-sized poly(methyl methacrylate) (PMMA) nanoparticles via electrospraying. The solution containing the PMMA nanoparticles were supplied through the inner nozzle and compressed air was emitted through the outer nozzle. The air supply helped fast evaporation of acetone, so it enabled copious amount of microparticles as dry powder. The microparticles were highly porous both on the surface and interiors, hence various materials with a function of UV-blocking (TiO2 nanoparticles and methoxyphenyl triazine) or antiaging (ethyl(4-(2,3-dihydro-1H-indene-5-carboxyamido) benzoate)) were loaded in large amount (17 wt % versus PMMA). The surface and interior structures of the microparticles were dependent on the characteristics of functional materials. The results clearly suggest that the process to prepare the raspberry-like microparticles can be an excellent approach to generate functional microstructures.


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