Synthesis And Properties Of Two-dimensional Nanosheets Of Polyaniline Coated Titanium Dioxide

In recent years, titanium dioxide as photoelectric material has been paid widely attention. On the one hand, it has good photocatalytic performance, which can obviously improve the photocatalytic efficiency in the process of further doping modification material. On the other hand, it has been widely and deeply researched in semiconductor, diodes, electrorheological fluid, due to the titanium dioxide has high dielectric constant. Two-dimensional nanomaterials is a hotspot in research of all materials in recent years, a unique optical and electrical properties makes it possess extremely extensive application prospect in the lubrication materials, photoelectric materials, display materials, high-efficient catalytic materials, hydrogen storage material, gas sensitive materials, and so on. Therefore, it is of great significance to synthesize two-dimensional structure of titanium dioxide nano-sheets, and to explore its electrorheological performance and photocatalysis. This article based on above purpose and make the several aspects of research as following:?1?Synthesized two-dimensional structure of PANI@TiO₂ under 0⁵ oC by using anatase TiO₂ nanomaterials, ammonium persulfate as initiator, concentrated hydrochloric acid as acid regulator, and aniline polymerization. And the internal structure, surface morphology and thermal stability of compound material was characterized by Atomic force microscope?AFM?, Scanning electron microscope?SEM?, Transmission electron microscopy?TEM?, X-ray diffraction?XRD?, Fourier infrared conversion device?FTIR?, and Thermogravimetric analyzer?TG?. The result shown that the PANI@TiO₂ was a typical two-dimensional nanosheets compound material, and its average thickness was about 3 nm, the size was about 100 nm.?2?The PANI@TiO₂ as dispersed phase material was dispersed in silicone oil to make slurry, and tested in electrorheological machine to study its electrorheological properties; then explored the influence of dispersed phase concentration, doping condition, and operating temperature on the electrorheological properties of PANI@TiO₂, At the sme time, a electrorheological properties comparison was made for PANI@TiO₂ and polyaniline, which synthesed in the same conditions. The results shown that the PANI@TiO₂ system had more excellent electrorheological properties than polyaniline system. The shear stress and viscosity of silicon oil system, the static yield stress and storage modulus, loss modulus of 5wt %, pH = 9 PANI@TiO₂ all along with the increase of the electric field, it had obvious ER effect; what's more, a increase of concentration leaded to the rheological effect strengthening of PANI@TiO₂ fluid; Doping pH had significantly effect on the performance of electrorheological material, as the result, pH = 9 PANI@TiO₂ silicone oil system has the best ER response. the yield stress of PANI@TiO₂ silicone oil system increase in linear with the temperature rising. However, the viscosity decreases with temperature risng, it also had a quadratic linear relationship. The analysis results of rheological behavior of PANI@TiO₂ silicone oil system shown that the rheological curve of system were better met CCJ and Bingham model, and its yield stress was positively conform than with electric field of a quadratic relationship.?3?There was a new research to study the ability of photocatalytic of PANI@TiO₂ under the irradiation of ultraviolet-visible to evaluate the photocatalytic performance of methylene blue?MB?dye degradation. By changing the amount of catalyst, pH value explored the influence factors of PANI@TiO₂ in photocatalytic activity. it shown that the PANI@TiO₂ has good photocatalytic performance to 10 mg/L MB with the irradiation of 120 min, the photocatalytic efficiency rechieved above 84%; In addition, there are still 77% effect on the degradation of MB after recycling capacity 5 times.