Frontiers of Mechanical Engineering and Materials Engineering III

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Authors: Gang Sun, Yan Fang
Abstract: The hydrophobicity and oleophobicity(methanol repellency) of butterfly wing surfaces were measured by a video-basedcontact angle (CA) meter. The multi-dimensional microstructure of the wingsurfaces was characterized by a scanning electron microscope (SEM) and an atomic force microscope (AFM). The wingsurface exhibits superhydrophobicity (water CA 150.4~159.2°) and low adhesion (water sliding angle 1~3°). Meanwhile, the wingsurface displays high repellency against methanol. The critical concentrationsfor wetting and spreading-wetting of methanol solution on the wing surface are60% and 80%, respectively. The butterfly wing surface is ofhydro-oleophobicity. The wing surface possessescomplicated hierarchicalmicrostructures. Using the butterfly wing as a bio-template, the hydrophobicsilver films were prepared. Water CA increases from metal silver’s intrinsicCA 63.0° maximally to 139.2° (Speyeria aglaja, 5 nm silver film). The microstructures on thewing surface result in the transition of metal silver from hydrophilic tohydrophobic. The butterfly wing can be used as a template for design of smartinterface and functional surface.
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Authors: Jing Li, Qiang Li, Feng Du, Wei Zhang, Chun Min Shang
Abstract: The bionic inadhesion structures have been built on aluminum alloy substrates by the method of pressing based on the bionic reducing adhesion theory. The factors influenced inadhesion property were studied. The microscale morphologies of bionic surface were observed on the stereomicroscope. The adhesion property between aluminum bionic surface and viscous medium were evaluated by measuring adhesive force by the test system of adhesive force.
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Authors: Yun Long Zhang, Yu Min Zhang, Cheng Hai Li, Jin Ping Li
Abstract: In this investigation, the rare-earth oxide La2O3 combined with Al2O3 served as sintering additives and commercial α-SiC and B4C powder were applied to fabricate SiC/B4C composites by pressureless sintering. The results proved that combination of Al2O3 and La2O3 sinter additives were effective for densification of SiC/B4C composites. The influence of sinter temperature on the phase constitution, micro-structure and densification behavior of SiC/B4C composites was investigated.
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Authors: Wei Huang, Ting Zhang
Abstract: In order to make the new composite wall structure the group developed to adapt different regional natural conditions, and along with the demand of gradually in-depth study the damage characteristics of the new composite wall, need to research the mechanical properties of the wall filling materials. In this paper, the ZG-CSS Electronic Universal Testing Machine was used on the uniaxial compressive test of the three blocks(the mud billet block, the cotton stalk block, the recycled EPS lightweight concrete block), to analyze the failure characteristics of the blocks and the other mechanical properties, such as Poisson’s ratio, elastic modulus, then the full compressive stress-strain curves are given, and at last fitting the mathematical expression of the uniaxial compressive stress - strain curves. And this paper also gives the yield criterion based on the unified strength theory of the three ecological filling blocks.
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Authors: Min Li, Liu Meng Chen, Bo Quan Jiang
Abstract: Collagen is an important biomedical material. Enzyme (papain) extracted collagen (EEC) and acid (citric acid) extracted collagen (AEC) were isolated from the scale of bighead carp. The process conditions of EEC and AEC were optimized, by orthogonal test method , to be: liquid/solid ratio 20 mL/g, extraction time 48 min, papain concentration 9.52×10-5 mol/L, temperature 28°C for EEC and liquid/solid ratio 20 mL/g, extraction time 36 min, citric acid concentration 0.5 mol/L, temperature 28°C for AEC.Under the optimal conditions the maximum extraction rates were 31.20% for EEC and 9.22% for AEC, respectively. Both EEC and AEC were characterized basically as type I collagen by UV spectra, infrared spectra and amino acid compositions.
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Authors: Bo Peng, Wen Ying Li, Guang Kai Yin, Zhi Hao Cheng
Abstract: This paper studies on shrinkage performance of recycled asphalt pavement (RAP) material blended with inorganic binder such as cement, lime-fly ash (lime and fly ash) and three ashes (cement, lime and fly ash), with certain intensity used as base course. The erosion, dry shrinkage and temperature shrinkage tests were conducted on the recycled asphalt pavement (RAP) material blended with the three kinds of inorganic binder, to evaluate and compare different types of cold recycled inorganic material shrinkage resistance capability and anti-erosion properties. After analyzing the fatigue test result of three-additives-stabilized recycled mixture, it showed that the recycled pavement mixture owned preferable anti-erosion properties, anti-temperature shrinkage resistance and anti-dry shrinkage performance.
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Authors: Kai Dong
Abstract: This paper constructs aphysical model of aluminium alloy 7075-T6 welding based on ANSYS software, andsets simulation welding process to successfully obtain the change data anddistribution rule of welding temperature field and stress field for convenienceof providing guidance for welding technology of aluminium alloy 7075-T6.
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Authors: Li Ying Guo, Jun Shi, Jun Hai He, Ji Yue Huang, Peng Cheng Huang
Abstract: Three kinds of functionalized imidazolium ionic liquid, 1-chloride (2-hydroxyethyl) -3-methyl imidazole ionic liquid [HeMIM]Cl, 1-bromide ethylamine-3-methyl imidazolium ionic liquid [AeMIM]Br and chlorinated 1-carboxyethyl-3-methyl imidazolium ionic liquid [CeMIM]Cl, were synthesized firstly. Subsequently, three kinds of supported silicon imidazolium ionic liquids were prepared from above ionic liquids with tetraethoxysilane by sol-gel method. The Chemical structure and crystal structure of the supported on silica based ionic liquids were analyzed by FTIR and XRD.
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Authors: Hai Tao Zhao, Rui Ping Liu, Qiao Wang, Kai Xin Yang
Abstract: TiO2/PPy composite was prepared by in situ polymerization of pyrrole on TiO2 microparticles. The results show that PPy chains have ordered arrangement to some extent. The average diameter of PPy microspheres is roughly 500 nm. TiO2 microspheres obtained are anatase-type. PPy/TiO2 composite particles are similar to spheres and there is some reunite phenomenon. The tanδe value for TiO2/PPy composite is higher than PPy in the frequency range of 8.2-12.4 GHz and it has achieved a maximum of 0.57 at 11.9 GHz.
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