International Journal of Material Science
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Open Access journal
ISSN (Print) 2226-4531 - ISSN (Online) 2226-4523
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- Crystalline Phase and Size-controlled Synthesis of Nickel Phosphide
Abstract: Crystalline Phase and Size-controlled Synthesis of Nickel Phosphide Nanocrystals
Author Yuan PanYunqi Li
Nanostructured nickel phosphides were synthesized via a thermal decomposition approach. The effect of synthetic conditions such as P:Ni precursor mole ratio, reaction temperature, reaction time, reductant oleylamine quantity and species of additive on the crystalline phase and size of the as-synthesized nickel phosphides was discussed systematically. The results show that lower P:Ni precursor mole ratio, higher reaction temperature, shorter reaction time and the addition of oleic acid were beneficial to form Ni12P5 phase with large size. In contrast, higher P:Ni precursor mole ratio, lower reaction temperature, longer reaction time and the addition of octadecene were beneficial to form Ni2P phase with small size. The variety of oleylamine quantity cannot realize the phase-controlled synthesis, but the size can be controlled. These synthetic method also can be used to synthesize others transition metal phosphides.
- Study on Green Supply Chain Coordination in ELV Recycling System with
Government Subsidy for the Third-Party Recycler
Abstract: Study on Green Supply Chain Coordination in ELV Recycling System with Government Subsidy for the Third-Party Recycler
Author Daqiang ChenPeiqi MaoDanzhi SunSasa Yan
With the rapid increase of car ownership in China, the quality of the end-of-life vehicle (ELV) is growing rapidly. Since the ELV recycling is helpful for environmental protection and cost reduction of the enterprise in the green supply chain, it is important for the government to design a proper strategy to strengthen the goodness of the green supply chain coordination. In this paper, a green supply chain system with one supplier, one automobile manufacturer, one retailer, one third-party recycler and one government in automobile industry is suggested. In this green supply chain, the third-party recycler can sold the recycled parts that can be reused to manufacturers, sold the rest dismantled parts to the suppliers, and can get a subsidy from the government. Then, game theory was applied and two different scenarios were analyzed for different pricing strategies with government subsidy for the third-party recycler, i.e. an independent decision scenario and joint decision scenario by cooperative game model. Based on the pricing analysis of the third-party recyclers of closed-loop supply chain pricing, it is found that in the joint decision scenario the profit is higher than the non-cooperative decision scenario and the government subsidy has no effect on the coordination of the green supply chain in ELV recycling system, so in order to reduce the automobile production cost, obtain high corporate profits and social benefits, each part of the supply chain should try their best to cooperate, formulate the pricing strategy jointly and the government needs to design more effective strategy to involved in the coordination of green supply chain.
- Ethylenediamine Modification of Hierarchical Mesoporous Carbon for the
Effective Removal of Pb(II) and Related Influencing Factors
Abstract: Ethylenediamine Modification of Hierarchical Mesoporous Carbon for the Effective Removal of Pb(II) and Related Influencing Factors
Author Y. B. LiK. Q. LiX. H. WangJ. L
The polyamine groups were successfully modified in the pores of hierarchical mesoporous bagasse carbon through nitric acid oxidation and ethylenediamine(EDA) polymerisation. The influence of nitric acid concentration, oxidation time, EDA dosage, and modification time on the Pb(II) adsorption ability of the modified mesoporous carbon were discussed in an L9(34) orthogonal experiment as well as the adsorption characteristics and mechanisms. The results suggested that EDA modification conditions significantly affected the Pb(II) adsorption ability. The modified carbons, under different conditions, showed a Pb(II) adsorption difference of 35%; the nitric acid concentration exerted the greatest influence, followed by EDA dosage, and modification time. The carboxylic acid group content in the pores of the biomass carbon was proved as the key agent controlling the Pb(II) adsorption ability of the modified carbon. The Pb(II) adsorption was consistent with the Langmuir model, suggesting that the energy was distributed evenly on the surface of the modified carbon.
- Effects of Yield Strength and Elastic Modulus on Cement Sheath Interface
Stress at Well Head
Abstract: Effects of Yield Strength and Elastic Modulus on Cement Sheath Interface Stress at Well Head
Author Jingfu ZhangSiyu ChenYingbo LvJundong ChenQiang Zhan
For reasonable choice of mechanical parameters and keeping long-term sealing performance of cement sheath, effect laws of yield strength and elastic modulus on the interface stress of cement sheath at well head were researched. Finite element mechanical model of the casing-cement sheath-stratum combination was established. Damage conditions of cement sheath structural integrity were analyzed. Results showed that every interface stress increased with the increase of the yield strength while cement sheath yielding deformation occurred. And the yield strength could not affect all interface stresses while the deformation was elastic. For lower elastic modulus, elastic deformation occurred in cement sheath and every interface stress increased with the increase of elastic modulus. For high elastic modulus, Cement sheath was partially or fully yielded. With the increase of elastic modulus, the interface contact stress increased, the inner interface circumferential stress decreased, and the interface contact stress was turned into tensile stress after unloading.
- Preparation and Electrochemical Performance Of Cr3+ and Sb5+ Co-Doped
Li4Ti5O12 Anode Material for Lithium-Ion Batteries
Abstract: Preparation and Electrochemical Performance Of Cr3+ and Sb5+ Co-Doped Li4Ti5O12 Anode Material for Lithium-Ion Batteries
Author Fuyun LiMin Zen
Cr3+/Sb5+ co-doped Li4Ti5O12 in the form of Li4Ti5-2xCrxSbxO12 (0≤x≤0.1) compounds were successfully synthesized via solid-state reaction method. The structure and electrochemical properties of the spinel Li4Ti5-2xCrxSbxO12 materials were investigated. The Li4Ti5-2xCrxSbxO12 (x=0.05) presents the best discharge capacity among all the samples, and shows better reversibility and higher cyclic stability compared with pristine Li4Ti5O12, especially at high current rates. When the discharge rate was 1C, the Li4Ti5-2xCrxSbxO12 (x=0.05) sample presented the excellent discharge capacity of 166.7 mAhg-1, which was very close to the theoretical capacity of Li4Ti5O12 (175mAhg-1).
- Cracking Angle of an Arbitrary Oriented Crack Embedded in a Strip under
I-II Mixed Mode Loading
Abstract: Cracking Angle of an Arbitrary Oriented Crack Embedded in a Strip under I-II Mixed Mode Loading
Author B. K. GuoH. H. YanL. Zhan
In this paper, the stress intensity factor and the initial cracking angle of a crack with an arbitrary oriented direction in a strip material are calculated. The aim is to consider the variation of the angle with the orientation of the cracks and their position. Firstly, the problem is separated by the superposition principle into several sub-problems which are solved using Fourier transformation technique. For the sub-problem of a crack, the unknown dislocation density functions are introduced. Singular integral equations are then obtained and solved by a numerical method. The stress intensity factor and the initial angle are obtained. The results show that crack tends to propagate to the free boundary and the influence of the existence of other cracks on the initial cracking angle can be negligible when the distance between the cracks is larger.
- Asymptotic Analysis of Thermoelastic Response in a Functionally Graded
Solid Based on L-S Theory
Abstract: Asymptotic Analysis of Thermoelastic Response in a Functionally Graded Solid Based on L-S Theory
Author Y. Z. WangJ. X
This paper is concerned with the thermoelastic response in a functionally graded solid with an analytical method. The governing equations are proposed in the context of Lord-Shulman generalized theory (L-S theory). The Laplace transform techniques and some approximate treatments are employed to have an analytical solution for the thermoelastic response in a semi-infinite solid composed of functionally graded materials, whose boundary is subjected to a sudden thermal shock. Some important phenomena involving finite speed of heat signal are obtained. The comparison with the results for different values of non-homogeneous index is also conducted to evaluate the effect of graded material properties on thermoelastic response.