【作者】 王一龙； 兰芳； 赵素玲； 凌轩； 陈志宏； 官建国；

【Author】 Yilong Wang;Fang Lan;Suling Zhao;Xuan Ling;Zhihong Chen;Jianguo Guan;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology;School of Chemistry,Chemical Engineering and Life Science,Wuhan University of Technology;Center for Material Research and Analysis,Wuhan University of Technology;School of Science,Wuhan University of Technology;

【机构】 武汉理工大学材料复合新技术国家重点实验室； 武汉理工大学化学化工与生命科学学院； 武汉理工大学材料研究与测试中心； 武汉理工大学理学院；

【摘要】 针对目前制备的镍包石墨复合粒子存在壳层不致密且形貌不可控等问题,本文提出了在不加任何表面活性剂与磁场的前提下,仅通过化学反应动力学调控的方法,制备出球形颗粒与纳米针状的镍包石墨复合粒子。研究了其形貌转变机理。发现NaOH浓度较低时,反应速率较低,成核后,为降低体系的表面自由能,新生成的镍晶核沿着表面自由能高的<110>方向生长,生成一维纳米针状镍;NaOH浓度较高时,反应速率较高,镍晶核各向同性生长,最终成为球形颗粒镍。以球形颗粒膜状镍包石墨复合粒子为填料制备的导电胶的体积电阻率为4.69×10-2?·cm,饱和磁化强度为40.6 Am2·kg-1,表明其具有优异的电磁特性,在导电与电磁屏蔽复合材料领域具有重要的应用前景;纳米针状镍包石墨复合粒子具有优良的催化活性可用于催化NaBH4还原对硝基苯酚合成对氨基苯酚,该复合粒子成本低廉、活性高,同时具有磁性易回收再利用等特点。更多还原

【Abstract】 Nickel coated graphite(GP@Ni) composite particles with two kinds of morphology,i.e.spherical and nanoneedle-like,were synthesized via a seed-mediated growth method in a facile reaction system by simply adjusting the reaction conditions.It was found that high concentration of sodium hydroxide enabled the growth of spherical GP@Ni particles,while low concentration of sodium hydroxide assisted the synthesis of nanoneedle-like GP@Ni particles.The electromagnetic and catalytic properties of the above two kinds of particles were further investigated.Our results show that conductive adhesive prepared with spherical GP@Ni particles possessed volume resistivity of 4.69×10-2 Ω·cm and saturation magnetization of 40.6 Am2·kg-1,giving better electromagnetic properties than that of nanoneedle-like particles.However,the catalytic performance of nanoneedle-like GP@Ni was better than spherical ones.The catalytic experiments indicated that the nanoneedle-like particles have many advantages,such as low cost,high activity and reusable after the catalytic reaction.更多还原