Polycarbonate nanoparticles spray coated on silicon substrate using micro-electromechanical-systems-based high-frequency ultrasonic nozzle

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• 作者：Yu Lin Song^a ; ^d ; Chih Hsiao Cheng^a ; Luh-Maan Chang^d ; Chia-Fone Lee^b ; ^c ; ^{e430013@yahoo.com.tw"" rel=""nofollow} ; Yuan Fang Chou^a ; ^{yfchou@ntu.edu.tw"" rel=""nofollow}
• 关键词：High-frequency ultrasonic nozzle ; Atomization ; Spray drying ; Polycarbonate
• 刊名：Applied Acoustics
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：72
• 期：12
• 页码：949-952
• 全文大小：789 K

文摘

Mono-disperse polycarbonate (PC) nanoparticles 20 nm in diameter was spray coated on silicon substrate using a novel high-frequency ultrasonic nozzle. Specifically, Bisphenol-A polycarbonate with a molecular weight (M_w) of approximately 6.4 × 10⁴ g/mol was first dissolved in pyridine. The resulting solution was sprayed into surfactant-containing de-ionized (DI) water using a 300 kHz silicon-based multiple-Fourier horn nozzle (MFHN). As pyridine was extracted into the water, PC nanoparticles formed but remained dispersed. This suspension of PC nanoparticles was then sprayed onto a silicon substrate using a 500 kHz 3-Fourier horn nozzle. Scanning electron microscopy (SEM) of the dried substrate revealed that PC nanoparticles were spread uniformly with no aggregation.