Magnetization-induced self-assembly method Micro-needle array fabrication》.pdf

Journal of Materials Processing Technology 227 (2016) 251–258 Contents lists available at ScienceDirect Journal of Materials Processing Technology j o u rn al h omepage: w w w. elsev /locate/jmat protec Magnetization-induced self-assembly method: Micro-needle array fabrication Chengfeng Pan a , Keyun Chen a , Lelun Jiang a,∗ , Zhipeng Chen a , Lei Ren a , Liang Liang b , Wei Yuan b a Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, Sun Yat-Sen University, Guangzhou 510006, PR China b School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, PR China a r t i c l e i n f o a b s t r a c t Article history: Magnetization-induced self-assembly method (MSM) was proposed to fabricate micro-needle array (MA). Received 21 March 2015 Curable magnetic fluid droplet array was extruded from the holes of perforated mask and meanwhile Received in revised form 16 August 2015 drawn to form the MA shape by magnetic force. MA was heated and cross linking solidified. The for- Accepted 24 August 2015 mation mechanism of magnetization-induced self-assembly micro-needle was analyzed and its process Available online 28 August 2015 was divided into three stages: powders magnetizing, chain and aggregation, formation of micro-needle tip, and formation of micro-needle. The formation process was observed by high-speed camera. It was Keywords: found that the formation process was consistent