Preparation of Poly(o-toluidine)/Nano ZrO2/Epoxy Composite Coating and Its Application for Corrosion Protection of Steel

The main objective was to study the anticorrosion performance of poly（o-toluidine）/nano ZrO2/epoxy composite coating.Poly（o-toluidine）/nano ZrO2 composite was prepared by in situ polymerization of o-toluidine monomer in the presence of nano ZrO2 particles.Fourier transformation infrared spectroscopy（FT-IR）,UV-visible spectroscopy（UV-vis）,X-ray diffraction（XRD）,Scanning electron microscopy（SEM）,and Thermogravimetric analysis（TGA） were used to characterize the composition and structure of the composite.Poly（o-toluidine）/nano ZrO2 composite was mixed with epoxy resin through a solution blending method and the three components poly（o-toluidine）/nano ZrO2/epoxy composite coating was coated onto the surface of steel sample by the brush coating method.The anticorrosion performance of poly（o-toluidine）/nano ZrO2/epoxy composite coating on steel sample was studied by polarization curve and electrochemical impendence spectroscopy in 3.5% Na Cl solution as corrosion environment and also compared with that of poly（o-toluidine）/epoxy composite coating and pure epoxy coating.It was observed that the composite coating containing poly（otoluidine）/nano ZrO2 composite has got higher corrosion protection ability than that of poly（o-toluidine）.The electrochemical measurement results demonstrated that poly（o-toluidine） fillers improve the electrochemical anticorrosion performance of epoxy coating and the addition of nano ZrO2 particles increases the tortuosity of the diffusion pathway of corrosive substances.

The characters of dense dispersion managed soliton in optical fiber transmission systems

The properties of ultra-short dense dispersion-managed soliton (DBMS) in optical fiber links are investigated. They show some excellent characters, such as, reducing pulse's breathing extent greatly, facing fewer mutual interactions and tolerating larger local dispersion. In general, DBMS is more stable than a conventional dispersion-managed soliton in high-capacity systems. Excessively dense dispersion compensation is more suitable for systems with weak nonlinear effect.

Characterization of Birefringence and Dispersion Properties in an Arrayed Waveguide Grating

We have characterized polarization dependent loss(PDL), differential group delay(DGD), and chromatic dispersion of an AWG and a simple method was proposed to estimate the chromatic dispersion from the measured DGD of the device.

Characterization of Intracellular Gold Nanoparticles Synthesized by Biomass of Aspergillus terreus

Greener synthesis of nanoparticle is a revolutionizing area in research field.Biological method of reduction of metal ions is often preferred because they are clean,safe,biocompatible,and environmentally acceptable than physical,chemical,and mechanical methods.The wet biomass of Aspergillus terreus（A.terreus） was utilized for the intracellular synthesis of gold nanoparticles.Gold nanoparticles were produced when an aqueous solution of chloroauric acid was reduced by A.terreus biomass as the reducing agent.Production of gold nanoparticles was confirmed by the color change of biomass from yellow to pinkish violet.The produced nanoparticles were then characterized by FT-IR,SEM,EDS,and XRD.The SEM images revealed that the nanoparticles were spherical,irregularly shaped with no definite morphology.Average size of the biosynthesized gold nanoparticles was 186 nm.The presence of the gold nanoparticle was confirmed by EDS analysis.Crystalline nature of synthesized gold nanoparticle was confirmed by XRD pattern.

Relationship between Crystal Structure of Inclusions and Formation of Acicular Ferrites

The formation mechanism of intragranular ferrites with acicular morphology was discussed.The ferrites were characterized by scanning electron microscopy.The results showed that the ferrites had an acicular structure with radial,symmetrical,and acicular laths,and that the inclusions were the nucleation sites of the intragranular acicular ferrites.Transmission electron microscopy（TEM）was used to characterize the inclusions.The results of TEM with energy dispersive spectroscopy and TEM-selected area electron diffraction indicated that the complex inclusions consisted of Ti-Al complex oxides and MnS.The jagged edges of the complex inclusions can be ascribed to the effects of the crystal structure.The stabilization energy U of the coordination polyhedron growth units varies with the type of connection according to the calculation results.A larger Ucorresponds to more stable growth units,which induces the preferentially oriented growth of inclusions,at which point acicular ferrites are formed.