Advanced Materials Research Vol. 790

Abstract: The building products were made from various materials, which are fitted in architectural hardware and decorative hardware parts of a building. This paper introduces the category of the building material, including naturally occurring substances and man-made substances. Building material is any material which is used for construction purposes. The manufacture of building materials is an established industry in many countries and the use of these materials is typically segmented into specific specialty trades

Abstract: Recently, oxidized chemical vapor deposition (CVD) growth graphene has drawn much attention due to its potential applications in the field of optoelectronics. In this article, we report a simple, scalable and efficient method to synthesize oxidized CVD growth single-layer graphene by the strong acid treatment. The results indicate that oxidation process successfully introduced more defects and oxygen-containing groups into the lattice of graphene.

Abstract: The microstructuresandcorrosion properties of the as-cast Mg-Zn-Ca-Zralloys were investigated in this study. The results showed that the alloy was mainly composed of -Mg solid solution,Zr particle and the secondary phase of Ca₂Mg₆Zn₃. The grain size of alloy specimens decreased with the increment of Zr content. The corrosion resistances were found to increase from 0.3% to 0.5% and then decrease from 0.5% to 0.7%. The Mg-4Zn-0.5Ca-0.5Zr had the best corrosion resistance in SBF solution.This was attributed to a combination of (1) the uniform and fine microstructure of alloy, (2) continuous distributions of the secondary phases, and (3) a lower volume fraction of Zr particles.

Abstract: The paper presents changes of natural frequencies of industrial steel hall due to simplifications or changes of numerical model. Firstly, the natural frequencies were calculated for basic Variant A of the numerical model of the steel hall which consisted of the main frames, footings, roof purlins and girts. In this Variant columns were fixed at bases, both purlins and girts were rigidly connected to main frames and designed as continuous beams. Then, in Variant B of the model columns were pinned at bases. Next, in Variant C different types of connections (semi-flexible joints) of roof purlins and girts with the main frame were implemented. Finally, in Variant D, soil-structure interaction was taken into consideration. The calculations of the dynamic characteristics of four abovementioned Variants of the numerical model of the hall showed that simplifications or changes of some details of the structure could result in significant errors in values of natural frequencies.

Abstract: PbO-type structure β-FeSe superconductor ceramic were successfully prepared by solid state sinter method in high vacuum state. The structures of the ceramics were investigated by X-ray diffraction and scanning electron microscopy. X-ray diffraction indicates that the sample prepared by two-steps method exhibited a much improved crystallinity. And as sintering temperature increases to 700°C, secondary phase Fe₇Se₈ phase peak disappear and α-Fe peak weakened. Besides, the ceramic prepared in 700°C exhibited a denser surface morphology in comparison to that prepared in 410°C and its composition is closer to the chemical formula FeSe according to EDX compositional analyses. It was noted that the resistivity of the sample, sintered at 700°C using two-steps sinter method, shows a linear metallic behavior from room temperature and onset is around T = 7.5 K.

Abstract: A series of Ti-based hybrid membranes were prepared via sol-gel reaction using tetrabutyl titanate, [Ti (OBu)₄] and tetraethyl orthosilicate (TEOS) as hybrid precursors. TGA and DSC thermal analyses revealed that these hybrid membranes have high thermal stability. Contact angle measurement shows that with an increase of Ti ingredient in hybrid membranes, their hydrophilicity decreased. The change in the surface color of sample adsorbed Cu (II) evidences that these Ti-based hybrid membranes can be used as adsorbents to adsorption separation copper (II) ions from Cu-bearing water.

Abstract: Size-dependent piezoelectric coefficient d₃₃(D) (D shows particle diameter) for small ferroelectrics is modeled in this paper. It is found that taking account of size effect is essential in understanding piezoelectric characteristics of nanoferroelectrics. The model prediction is in good agreement with the experimental results for PbTiO₃ nanoparticles, where d₃₃(D) increases correspondingly as D decreases.

Abstract: A two-dimensional coordination polymer [Fe (C₇H₃NO₄)(H₂O)₂]_n was prepared with pyridine-2,3,5-tricarboxylic acid (H₃pta) and iron (II) perchlorate at hydrothermal condition. Pyridine-2,3,5-tricarboxylic acid was decomposed to form the organic ligand of pyridine-3,5-dicarboxylate anion appeared in 1. Its crystal structure was determined by single crystal X-ray diffraction. The complex belongs to monoclinic crystal system, C2/c space group with a = 0.9945(2) nm, b = 1.2067(3) nm, c = 0.74125(15) nm, α = γ = 90°, β = 105.859(3)°, V = 0.8557(3) nm³, Z = 4, D =1.995 Mg/ m³. The Fe (II) ion is five-coordinated by one nitrogen atom and four oxygen atoms. Furthermore, each Fe (II) ion bond with two other oxygen atoms on carboxyl groups by weak coordination action. The five coordination atoms form a distorted trigonal bipyramid coordination geometry. These coordination geometries are interlinked into a 2D alveolate net structure. The 2D layers are further connected into a 3D coordination polymer by hydrogen bonds.

Abstract: The migration and distribution characteristics of the COD in the enriching process of Coking Desulfurization Waste Solution (CDWS) were researched in this paper. The results show that COD in the early and late condensate are all up to 10000mg/L and it is decreased at first and then increased in CDWS evaporating concentration process. This result is caused by substances containing organic at prophase and inorganic in the late. Therefore, removing the organic matter in the wastewater and controlling the temperature in CDWS concentrating process is the key to reduce the COD in condensate.