摘要
为了构建自驱动运动的自驱动微马达,采用真空溅镀技术与化学聚合相结合的方法制备了一种具有温度敏感性质的Janus粒子P(MAA-co-DVB)@Pt@PNIPAM,并利用此粒子中不对称分布的Pt催化H_2O_2快速分解的特性,与H_2O_2溶液共同构建了自驱动微马达,以实现纳米粒子在液体中的自驱动运动.其中,具有催化活性的金属Pt被温度敏感的PNIPAM外壳所包裹,使自驱动微马达的运动受到温度变化的影响.此外,利用红外光谱(FTIR)、扫描电镜(SEM)和透射电镜(TEM)对产物的形貌和化学成分进行了表征.还通过带有热台的光学显微镜对自驱动马达的运动进行了实时观测.结果发现:在10%的H_2O_2溶液中,25℃下粒子的运动速率明显高于40℃下的运动速率,证实了粒子在双氧水中的自驱动运动及温度变化对运动的影响.
In order to construct an autonomous micromotor with self-driven movement, a thermosensitive Janus particle P(MAA -co -DVB)@Pt@PNIPAM was synthesized by the combination of vacuum sputtering and chemical polymerization. By virtue of the property of fast decomposition of H2O2 catalyzed by the asymmetrically distributed Pt, this particle can be used to build an autonomous micromotor by adding H2O2 aqueous solution as the fuel. This micromotor can realize a self-driven movement in the particular liquid. Herein, the catalytically active Pt was covered by the thermosensitive PNIPAM shell, which affected the movement of autonomous motors by altering the system temperature. Furthermore, Fourier transform infrared spectroscopy(FTIR), scanning electron microscope (SEM) and transmission electron microscope(TEM) were performed to determine the morphology and chemical composition of the synthesized Janus particle. Meanwhile, the movement of the autonomous micromotor was in situ observed by the optical microscopy in the hot and cold stages. It is obvious that the Janus particles moved in one direction when the H2O2 was added into the system, and the velocity of the Janus particles became much smaller when the temperature increased from 25 ℃ to 40 ℃ in 10% H2O2 aqueous solution.
作者
刘巍
李可
陈一兮
黄小雨
魏俊富
LIU Wei;LI Ke;CHEN Yi-xi;HUANG Xiao-yu;WEI Jun-fu(State Key Laboratory of Separation Membranes and Membrane Process, Tianjin Polytechnic University, Tianjin 300387,China;School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China;Tianjin Colouroad Coatings & Chemicals Co Ltd, Tianjin 300457, China)
出处
《天津工业大学学报》
CAS
北大核心
2017年第1期41-47,共7页
Journal of Tiangong University
基金
国家自然科学基金资助项目(21504063)
天津市科技计划项目(15PTSYJC00230)
关键词
Janus粒子
自驱动微马达
蒸馏沉淀聚合
温度敏感
Janus particles
autonomous micromotors
distillation-precipitation polymerization
thermosensitive