BaTiO3/gelatin核壳复合粒子的制备及电场响应性能研究  

Preparation and electric response of BaTiO_3/gelatin core-shell composite particles

作　　者：李丽[1] 海金玲[1] 谢超[1] 高玲香[1] 

机构地区：[1]陕西师范大学化学化工学院,应用表面与胶体化学教育部重点实验室,陕西西安710062

出　　处：《功能材料》2013年第11期1570-1573,1578,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20941001);研究生培养创新基金资助项目(2012CXS047)

摘　　要：为了提高BaTiO3颗粒在含水弹性体中的电场响应能力,以粒径约为500nm的单分散球型Ba-TiO3颗粒为基础,采用微乳液法成功制备了BaTiO3为核、明胶(gelatin)为壳的BaTiO3/gelatin核壳复合粒子。利用TEM、XRD、FT-IR、TG和光学接触角测量等手段对粒子的组成、结构及表面亲水性能进行了表征和测量。结果表明,在立方相BaTiO3核的表面均匀包覆了1层约40～50nm的gelatin,Gelatin壳层约占粒子总重的4.0%,且粒子表面保持良好的亲水性。将粒子分散到含水胶体体系中,通过测量在无/有电场作用下胶凝得到的含水弹性体的储能模量考察了粒子在此体系中的电场响应性能,发现BaTiO3/gelat-in复合粒子在明胶(或壳聚糖)水凝胶弹性体中的电场响应性能均明显强于纯BaTiO3粒子,而且在明胶水凝胶中的响应性能更强。结果说明,聚合物包覆能够明显提高BaTiO3粒子的电场响应性能,而且粒子表面与分散体系相容性越高,粒子的响应性能越好。To improve the BaTiO3particles response to electric field in hydrous elastomers,the composite particles with BaTiO3/gelatin core-shell structure were prepared by microemulsion method.Particles’morphology,structure,composition and surface hydrophile have been characterized by TEM,XRD,FT-IR,TG and optical contact angle measuring instrument.The results show that the cubic BaTiO3particles surfaces uniformly coated with a layer of about 40-50nm gelatin,gelatin shell accounts for about 4.0% of the total weight and the particles surface still keep hydrophilic.BaTiO3and BaTiO3/gelatin composite particles were dispersed into gelatin（and chitosan）/glycerol hydrous elastomers cured without/with an electric field,and the difference of storage modulus of the opposite elastomers suggests the particles’response behavior.It is indicated that BaTiO3/gelatin composite particles have stronger electric response than pure BaTiO3particles,especially in gelatin hydrous elastomer.It meansthat polymer-coating can obviously improve BaTiO3particles electric response,and when the interface compatibility of particles surface with dispersion system is better,the particle may possess stronger response.

关 键 词：核壳复合粒子 BATIO3 GELATIN 电场响应 含水弹性体 

分 类 号：TB381[一般工业技术—材料科学与工程]