Poly(D,L-lactide) (PDLLA) and chitosan--graft--poly(D,L-lactide) (CS--g--PDLLA) copolymer were synthesized firstly in supercritical carbon dioxide (scCO2) using D,L-lactide and chitosan as raw materials and tin (II) 2--ethylhexanoate as catalyst. Then, CS--g--PDLLA/PDLLA porous scaffolds were prepared in-situ by scCO2 extraction/pore forming technologies. The structure and properties of the graft copolymers and the molecular weight of PDLLA were characterized. The porous structure morphology of the scaffolds was observed and the porosity of the scaffolds was measured. The results showed that PDLLA and CS--g--PDLLA were synthesised successfully in scCO2 fluid, and the structure of the graft copolymer, the molecular weight and yield of PDLLA can be adjusted by controlling the feeding ratio, reaction temperature and time. Uniformly distributed and highly interconnected pore structures with a unique long gully type microstructure were formed in the CS--g--PDLLA/PDLLA scaffolds, and the compatibility of CS--g--PDLLA with PDLLA was good. Moreover, the depressurization rate and temperature have effects on the structure morphology of the porous scaffolds.

The paper proposes a dual-toughening method of ceramic, including metal composite and crystal whiskers strengthening, through adding Mg-Y oxides into Fe-Mo/Si3N4 cermet and subsequently consolidated by normal pressure sintering. The effects of Mg-Y oxides on the microstructure and properties of the Fe-Mo/Si3N4 cermet have been investigated. The results show that Fe and MoSi2 phases with good wettability on Si3N4 are formed in the Fe-Mo/Si3N4 cermet with Mg-Y oxides addition. Additionally, granular α-Si3N4 converts into whisker-shaped β-Si3N4, simultaneously with obvious densification, grain refinement and significantly improved properties, indicating that the dual-toughening method of the metal composite and the crystal whiskers have been realized.

The hot compression test results of Inconel625 alloy have been analyzed and the errors in flow stress caused by thermal effect were corrected. The true stress-strain curves were obtained at the temperature of 1000--1200℃ and the strain rates of 10--80 s-1. Constitutive equation of Inconel625 alloy at high temperature and high speed was established by curvilinear regression method. The microstructure after deformation showed that enhancing strain rate can refine< microstructure well, but there would be twinning remained when the strain rate was overly high. The microstructure would be most homogenous and finest under acceptable temperature (1050℃) and strain rate (50 s-1).

The in-situ electrochemical impedance spectrum measurements were conducted to investigate the early stage of the atmospheric corrosion behavior of the magnesium alloys with different volume fractions of β phase. The results indicated that β phase played a key role in the course of atmospheric corrosion of the magnesium alloys that was induced by NaCl particles centralized in the early time period. During the early ten hours the magnesium alloys with high volume fraction β phase had a bigger chargetransfer resistance, showing a better corrosion resistance. This phenomenon could be attributed to the better corrosion resistance of β phase. However, a faster corrosion occurred for the magnesium alloys with high volume fraction β after ten hours when the β phases were broken and the charge-transfer resistance dropped dramatically due to the high concentration of Cl−. As the exposure time prolonged, the protective function of the corrosion product films in Mg–3Al alloy was significantly better than those in the other two alloys as they helped slow down the corrosion rate of magnesium alloys with less volume fraction β phase.

O–quaternized–N,N–dilauryl chitosan was prepared and characterized by FTIR, EA and 1H NMR. The behaviors of mixed monolayers of O–quaternized–N,N–dilauryl chitosan and cholesterol were studied. It showed that the limiting molecular area Aex and collapse pressure πc of mixed monolayers gradually decreased as the cholesterol molar ratio increased from 0.2 to 0.8. The values of ΔGexc changed from an attractive interaction to a repulsive interaction between O–quaternized–N,N–dilauryl chitosan and cholesterol with a critical point of cholesterol molar ratio 0.4 added in the mixed system, and the most stable state of mixed monolayers was observed at molar ratio of cholesterol 0.2.

Thermo–Calc software was used to predict the microstructure of a new 9–12%Cr low–activation F/M steel designed for SCWR fuel cladding tube material. The microstructure of the experimental steel after quenching–and–tempering heat treatment was observed, and the chemistry and other characteristics of the precipitates were studied. The results showed that the experimental steel had a typical tempered martensitic structure. The precipitates located in various boundaries were Cr–rich carbides M23C6. After quenching and tempering, the specimens were cold deformed to a reduction of 60% and then annealed at 820   for 10–300 min. M23C6 wouldn't disappear during the process of recrystallization and transformation from ferrite to austenite at high temperature. The proportion of Cr to Fe was increasing during the process and finally reached to 2. The chemistry composition was (Cr15Fe6W2)C6.

The PMHS–SiO2 superhydrophobic coatings were prepared by sol–gel process. The preparation conditions, structure and properties of the coatings were investigated by contact angle measurement, Fourier transfer infrared spectroscopy (FTIR), Transmission electron microscope (TEM), Scanning electron microscope (SEM) and hygrothermal ageing. The results show that the contact angle of the coating reaches 163? and rolling angle is 3?–5? when the PMHS/SiO2 mass ratio is 1:1, modified time is 4 h, and heat–treated conditions are 170 ℃ for 3 h. The coatings also have good hygrothermal ageing resistance. The crosslinked PMHS–SiO2 hybrid materials was obtained due to the chemical combination between PMHS and SiO2 surfaces. The excellent superhydrophobic property of the coatings is due to dual effects of forming an appropriate surface roughness with micrometer–nanometer composite particles and the low surface energy of PMHS.

The antibacterial activity was studied by the antibacterial experiments of polyaniline solvents, polyaniline powders and polyaniline composite films in this paper. The components of polyaniline solvents were analyzed by FT–IR. We investigated the antibacterial property of polyaniline on E. coli, S. aureus, C. albicans and B. subtilis. The influences of the contact time on their antibacterial property were studied. The morphology of the bacterial before and after treated by polyaniline was observed by SEM. The antibacterial mechanism was also discussed.

This article investigates the effect of various degrees of plastic deformation introduced by cold rolling at ambient temperature on the tensile properties of 301 stainless steel containing 0.8% Mo. The results indicate that the formation of strain-induced martensite evidently leads to a significant strengthening of the steel. The tensile and yield strengths as well as hardness increase linearly with the increase of cold rolling reduction. After 52% rolling reduction, the amount of martensite is about 75%, and the tensile strength is elevated to be about 1700 MPa. The addition of 0.8% Mo has a slight effect on tensile and yield strengths, but the plasticity is not decreased.

The tensile properties at room temperature and at 650℃ of TMW–1 titanium alloy and TMW–2 titanium alloy, with different content of β–stabilizers (Mo, W), under different dual and ternary annealing, were studied. The results show that the tensile properties of TMW–1/2 titanium alloys at 650℃ were equivalent to those of several near α alloys at 600℃, without reducing the room temperature ductility. In order to improve the tensile properties at 650℃, the content of β–stabilizers (Mo,W) should keep the coefficient of β–stabilizers at 3.0–3.5.

Zinc oxide nanopowder with hydrophobic surface was synthesised by mechanochemical reaction using zinc acetate sodium hydroxide and stearic acid as raw materials. The modification mechanism of stearic acid on the surface property of ZnO was studied using XRD, FT–IR, TEM and particle size measurement. The experiment results show that an organic film was formed through covalent bond between the carboxyl of stearic acid and hydroxylic on the ZnO surface. The surface property of ZnO nanopowder was changed from hydrophilic to hydrophobic coated with a monomolecular layer of aliphatic
chains. When the milling time is 50 min and the mass content of stearic acid in ZnO 4.5%, the ZnO nanopowder with optimal modification effect can be achieved.

The modification of low-temperature co-firing for M-type Ba-ferrite by the addition of BBSZ was investigated. The results showed that the barium ferrites could be sintered completely at 900 ℃ with well densification structures due to the induction of appropriate amount of BBSZ. The optimal amount of BBSZ was 2%, which could guarantee the low-temperature co-firing performances and excellent magnetic performance of the material.

The fracture toughness and fracture behavior of GH690 alloy were investigated by means of three-point bending tests and the J-integral method in the range of the room temperature to 623 K. The results show that the fracture toughness of the alloy decreases with the increasing of testing temperature. The stacking fault energy of GH690 alloy is low at room temperature and the alloy was deformed by twinning. Deformation twins perpendicular to the main crack could lead to the deflexion of the crack, which is beneficial to the enhancement of the fracture toughness. However, with the testing temperature elevated, the stacking fault energy increases and the number of the deformation twins decreases, allowing
an easier propagation of the crack and is responsible for the decrease of the fracture toughness of GH690
alloy.

Porous anodic films on AZ91D magnesium alloy were prepared at constant current densities. Effects of the current density on anodizing process were studied according to voltage-time response. The morphologies and adhesive properties of the anodic films were studied. The results showed that the current density had no effect on the value of breakdown voltage and critical voltage, but the anodizing time to reach breakdown voltage and critical voltage decreased as the current density increased. The porosity and the adhesive bonding strength of the anodic films increased first and then decreased as the current density increased. The films formed at the current density of 10 mA/cm2 and exhibited the highest adhesive bonding strength, approaching to 22.40 MPa.

Carbon black/polyester (CB/PET) electrically conductive fibers were prepared by meltspun method. The effect of coupling agent on the percolation threshold concentration and Tg of CB/PET fiber was discussed, and the relationship of CB content with thermal and electrical properties of CB/PET fibers was investigated. The results showed that percolation threshold content and Tg of CB/PET fiber were decreased after CB being treated by coupling agent. And CB content has a strong effect on the properties of CB/PET fiber, i.e. the positive temperature coefficient effect of CB/PET fiber moves to
higher temperature with CB content increasing; CB/PET fiber has a strong positive strain coefficient effect when CB content is 11%.

CeO2 hollow microspheres with controlled shell thickness were synthesized via a simple polystyrene sphere template method. The as-synthesized products were characterized by TEM, FESEM, SAED, FTIR and DLS. The degradating performance of the CeO2 hollow microspheres on phenol was investigated. The results indicate that the CeO2 hollow microspheres with the external diameter approximately of 230–260 nm and the internal diameter of 200 nm possess thin shell composed of loosely packed CeO2 nanoparticles (particle diameter of 5–10 nm). The shell thickness of CeO2 hollow microspheres can be controlled from 15 to 30 nm by adjusting the concentration of Ce(NO3)3·6H2O in the reaction solution. The degradation rate of CeO2 hollow microspheres can reach to 95% for the phenol.

Ordered PbWO4 nanostructures were synthesized by a direct precipitation method, and the oxalate anions with double carboxyl were employed as structure-directing agents in the growth stage of PbWO4 nanocrystals. The PbWO4 nanostructures were characterized by X-ray power diffraction (XRD), scanning electron microscopy (SEM), infra-red spectrum (IR) and transmission electron microscopy (TEM). The control role of the oxalate anions in the growth stage of PbWO4 nanocrystals was investigated and formation mechanism of the ordered PbWO4 nanocrystals was proposed.

LaNi5 alloy films have been prepared by magnetron sputtering. Through annealing their surface structure was improved and they had the capacity of absorbing and desorbing hydrogen in the air. The structure, surface morphology and element composition of the samples before and after annealing were analysed by X-ray diffraction, atomic force microscopy and X-ray photoelectron spectroscopy, respectively. The results showed that specific surface area of LaNi5 films was increased and a kind of surface structure of La2O3-Ni was formed after annealing. The hydrogen sensitivity of the annealed samples was studied and results indicated they are in response to hydrogen at room temperature in the air without activation in hydrogen atmosphere, which suggested LaNi5 alloy films have large potential application in hydrogen sensor.

EG was exfoliated into MSGF under high-energy ultrasound, and then the graphite/paraffin composite was prepared by mixing MSGF into melted paraffin. The structure and thermal properties of the composites were characterized using SEM, Hot Disk, and DSC. The experimental results show that the composites exhibit both high thermal conductivity and good thermal storage capacity, the speed of heat storage is raised and the chemical properties are stable. Moreover, with the increase of MSGF’s mass fraction, the thermal conductivity behaves non-liner increase both in solid and liquid states. Meanwhile, the melting point and latent heat capacity show negligible decrease.