高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (11): 2131.

• 研究论文 • 上一篇    下一篇

金属纳米粒子在聚合物中的磁致排列──实验及分子动力学模拟

张邦文, 谢长生, 胡军辉, 王辉虎, 桂阳海   

  1. 华中科技大学材料学院塑性成型模拟与模具技术国家重点实验室, 武汉430074
  • 收稿日期:2005-01-10 出版日期:2005-11-10 发布日期:2005-11-10
  • 基金资助:

    国家自然科学基金(批准号:50271029);中国博士后科学基金(批准号:2005037671)资助

Magnetic-field-induced Alignment of Metal Nanoparticles in Polymer──Experiments and Molecular Dynamics Simulation

ZHANG Bang-Wen, XIE Chang-Sheng, HU Jun-Hui, WANG Hui-Hu, GUI Yang-Hai   

  1. State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China
  • Received:2005-01-10 Online:2005-11-10 Published:2005-11-10

摘要: 用磁场控制碳包镍纳米颗粒在环氧树脂中的排列,制备了具有优异电学性能的一维有序的纳米复合材料.在添加质量分数为3%-10%的镍纳米颗粒时,导电率提高了3个数量级,介电常数增大了2-3倍.对纳米颗粒的磁致排列进行了分子模拟,结果表明,偶极强相互作用是导致纳米粒子排列的主要原因,排列过程经历了聚合、成链和粗化等阶段,成链的时间尺度在秒数量级.模拟结构与实验观察结果基本一致.

关键词: 金属纳米颗粒, 聚合物纳米复合材料, 磁场, 排列, 分子动力学模拟

Abstract: A one-dimensional ordered nanocomposite was fabricated by utilizing magnetic field to control the alignment of carbon-coated nickel(Ni@C) nanoparticles in epoxy resin.It exhibits an excellent improvement in electrical conductance and dielectric constant.With the loading mass fraction of 3%—10%,the resistivity of resulting composite decreases by 3 orders of magnitude with respect to unaligned composite.A molecular dynamics model was designed to simulate the structure evolution of nanoparticles in resin curing.The simulated results show that the alignment of nanoparticles arises from the dominant magnetic dipolar interaction,and experiences a shift from aggregation to chaining then to chain thickening;the time scale for chain growth is the order of seconds,there is nearly not dynamics barrier for the alignment of Ni@C nanoparticles in epoxy resin;the simulated structure agrees basically with those observed in experiments.

Key words: Metal nanoparticle, Polymer nanocomposite, Magnetic field, Alignment, Molecular dynamics simulation

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