Preparation and electric response of BaTiO3/gelatin core-shell composite particles
To improve the BaTiO3 particles 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 BaTiO3 particles 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.BaTiO3 and 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 BaTiO3 particles,especially in gelatin hydrous elastomer.It meansthat polymer-coating can obviously improve BaTiO3 particles electric response,and when the interface compatibility of particles surface with dispersion system is better,the particle may possess stronger response.
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