دانلود رایگان مقاله رفتار الکترورئولوژیکال اکسید تیتانیوم ناهمسانگرد / هسته پلی آنیلین / نانوکامپوزیت پوسته

Abstract

Anisotropic titanium oxide/polyaniline core/shell nanocomposite was synthesized via a three-step method, and its electrorheological (ER) properties under external applied electric field were researched. Firstly, monodispersed amorphous titanium oxide nanospheres were prepared by a controlled hydrolysis method and then anisotropic titanium oxide peanut-like nanospheres was obtained by using weak acid to etch the monodispersed titanium oxide sphere. At last, the surface of anisotropic TiO2 was coated with polyaniline (PANI) through an in-situ polymerization method. Then the influence factors on the preparation of anisotropic TiO2/polyaniline core/shell structure nanoparticles were discussed deeply, including different kinds and amounts of acid, the amount of aniline, and so on. The morphology and structure of the samples were characterized by scanning electron microscopy, transmission electron microscopy, zeta potential analysis and X-ray powder diffraction, respectively. The electrorheological behaviors of the anisotropic TiO2/polyaniline composite particles are characterized using a rotational rheometer, which shown a good ER activity.

4. Conclusions

In brief, the anisotropic-like TiO2/polyaniline core/shell structure nanoparticles has been obtained by a three-step method. Then it discussed the factors which have influence on the preparation of anisotropic-like TiO2/polyaniline core/shell structure nanoparticles, including different kinds and different dosages of acid, the amount of aniline, and so on. The obtained anisotropic TiO2/PANI coreeshell nanoparticles exhibit a good ER behavior. The rheological test showed that the suspension consisting of anisotropic TiO2/PANI coreeshell nano-composite particles exhibits a strong ER effect. Its ER efficiency was approximately 74.2, which is really a high value. This work provides a new application for anisotropic coreeshell nanocomposites as ER smart materials in the future.