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Changchun, China

Chuanyu S.,Yinuo Institution | Wang Y.,Yinuo Institution
Powder Metallurgy and Metal Ceramics | Year: 2015

Four different types of electrolyte (aluminate, silicate, borate, and phosphate) solutions were optimized to be used for the surface treatment of aluminum alloy 7075 by plasma electrolytic oxidation. Microstructure, phase composition, and corrosion resistance of ceramic coatings on the surface were analyzed by SEM, X-ray diffraction, and electrochemical work station. It was demonstrated that ceramic coatings prepared in aluminate solution had excellent continuity and a compact structure with micro hardness of HV0.1 =1100 MPa. The majority of all coatings consisted of γ-Al2O3and bits of α-Al2O3. The corrosion potential was increased to a small extent, while the corrosion current density was significantly reduced. © 2015 Springer Science+Business Media New York

Chuanyu S.,Yinuo Institution | Yu W.,Yinuo Institution
Materials Science- Poland | Year: 2015

In this study, nitrocellulose (NC) fiber blanket prepared by electrostatic spinning method has been used as a template, and copper nitrate (Cu(NO3)2) as an oxidant to synthesise polyaniline nanotubes doped with heteropolyacid (H4SiW12O40, SiW12) using UV light catalytic method. Infrared spectroscopy (IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technologies were applied to characterize the prepared samples of polyaniline nanotubes. The results show that the external diameter of the tube is about 200 nm, and the internal diameter about 170 nm. We also give a reasonable speculation and explanation about the formation mechanism of the nanotubes. © Wroclaw University of Technology.

Chuanyu S.,Yinuo Institution | Yu W.,Yinuo Institution
Materials Science- Poland | Year: 2015

In the paper, a magnetic composite of graphene oxide (MGO) has been successfully synthesized through decomposition of iron (III) acetylacetonate in the mixture solution of triethylene glycol and graphene oxide (GO). Atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and superconducting quantum interference device were used to characterize the material. The results show that the magnetic Fe3O4 nanoparticles modified graphene oxide composite with superparamagnetic properties, and magnetization saturation of 16.4 emu/g has been obtained. The MGO has a good sustained-release performance, and in vitro cytotoxicity confirming its secure use as a potential drug carrier. © 2015 Wroclaw University of Technology.

Sun C.,Yinuo Institution | Yu W.,Yinuo Institution
Materials Science- Poland | Year: 2014

In this article nanoscaled polyanilines (PANI) were prepared based on template-free method in the presence of dicarboxylic acid dopants (e.g. D-tartaric acid, succinic acid, maleic acid and fumaric acid). The trans-cis isomerization of butenedioic acid played an important role in the formation of nanostructures from the plane-like to nanofibers, and the PANI doped with maleic acid (MA) had larger diameter, higher crystallinity and conductivity than PANI doped with fumaric acid (FA). © 2014 Elsevier BV.

Sun C.,Polytechnic of Milan | Sun C.,Yinuo Institution | Farabi Rahman M.D.,Polytechnic of Milan | Farabi Rahman M.D.,Yinuo Institution | And 2 more authors.
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2014

In this article, Polyaniline(PANI) nanostructure was prepared at room temperature using oxalic acid(OA) as dopant and ammonium persulphate (APS) as oxidant by self-assembly method. The structure and property of polyaniline nanostructures were characterized by SEM, TEM, IR and X-ray diffraction(XRD) methods. These measurements prove the successful synthesis of polyaniline nanostructures. It is found that the molar ratio of OA to An(aniline monomer) affects the morphology of the PANI product. © 2014, National Institute of Optoelectronics. All right reserved.

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