以平均粒径约为500 nm的BaTiO3微球为基核,通过“一步法”成功地制备了BaTiO3@Cu核-壳复合粒子.利用SEM、TEM、XPS、介电测量分析仪和阻抗分析仪等对复合粒子的组成、结构、介电性能和磁性能进行测定.另外将纯BaTiO3和BaTiO3@Cu核-壳复合粒子分别分散到水凝胶中,通过测量和分析在有/无电场、磁场和电磁复合场作用下得到的水凝胶的储能模量,考察粒子在水凝胶中的电、磁和电磁响应性能.结果表明,BaTiO3@Cu复合粒子具有完整清晰的核-壳结构,在整个表面壳层铜元素中,Cu(0)的原子分数达到了90at％,具有优良的介电性能和磁性能.BaTiO3@Cu核-壳复合粒子是一种对外加电场和磁场作用都具有响应性能的多功能新型智能材料,且其电磁复合响应性能显著强于纯BaTiO3粒子.
The BaTiO3@Cu core-shell composite particles were prepared by simple one-step method using BaTiO3 microspheres with an average size about 500 nm as based shell.The structure,component,morphology,surface chemical elements,dielectric and magnetic properties of the BaTiO3@Cu core-shell composite particles were charac terized by SEM,TEM,XPS,dielectric analyzer and impedance analyzer.The BaTiO3 and BaTiO3@Cu particles were dispersed into gelatin hydrogel elastomers cured with/without an electric,magnetic or electromagnetic field in order to measure the storage modulus of the elastomers and investigate the electro,magneto and electromagnetic response properties of the particles in the gelatin hydrogel elastomers.The results show that the composite particles present excellent core-shell structure with good electro and magneto response.On the surface of the composite particles,the Cu(0) accounts for about 90at％ of the total Cu element.It is indicated that BaTiO3@Cu core-shell com posite particle is a new type of multifunctional smart material responding to applied electric and magnetic field,and compared with the bare BaTiO3 particles,the electromagnetic response performance of the BaTiO3@Cu composite particles is obviously improved.
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