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Xiang H.,Guangdong Industry Technical College | Lu W.-G.,Shaoguan University | Zhang W.-X.,Sun Yat Sen University | Jiang L.,Sun Yat Sen University
Dalton Transactions

A unique compressed octahedral {CrIII 2Dy III 4} aggregate is the first sulfate-based single-molecule magnet (SMM) with Ueff/kB = 39.7 K and τ0 = 2.9 × 10-9 s. Its synthesis opens a new avenue to prepare 3d-4f coordination clusters. © The Royal Society of Chemistry 2013. Source

Bai P.,Guangdong Industry Technical College
Advanced Materials Research

Due to great pressure difference between inlet and outlet, high-pressure gear pump can cause unbalanced radial force, which results in serious wearing between axle journal of drive shaft and bearing-hole, non-ideal dynamic characteristics, and drop of volumetric efficiency after long run. This paper introduces a new sealing structure. Based on this structure, a high-pressure oil reservoir is installed on the wall of the inner-hole of floating plate for radial support and lubricating, which can effectively reduce shaft wearing and noise, and improve working dynamic characteristics of high-pressure gear pump. © (2012) Trans Tech Publications. Source

Wang S.,South China University of Technology | Qin P.,South China University of Technology | Fang X.,South China University of Technology | Zhang Z.,South China University of Technology | Liu X.,Guangdong Industry Technical College
Solar Energy

This paper demonstrates a novel sebacic acid/expanded graphite (SA/EG) composite phase change material for medium-temperature solar heat storage. The optimal mass percentage of SA in the SA/EG composite PCM is determined to be around 85%, at which not only SA exhibits a uniform distribution into the pores of EG but also the liquid leakage can be effectively prevented. The composite PCM with the SA mass percentage of 85% has a phase change temperature of 128. °C with the latent heat as high as ca. 187. J/g. The combination of SA and EG effectively prevents the low extent of subcooling inherent in SA. Compared to SA, the SA/EG composite PCM has the advantages of negligible subcooling as well as better thermal reliability and stability. The SA/EG composite PCM can easily be formed into various shapes by dry pressing, with little loss in thermal properties but a remarkable increase in thermal conductivity. The good thermal properties and formability make the SA/EG composite PCM show great potential in latent heat storage systems. © 2013 Elsevier Ltd. Source

Lin S.-L.,South China University of Technology | Xu M.-Y.,Guangdong Industry Technical College | Yang Z.-R.,South China University of Technology
Soft Matter

For the first time dissipative particle dynamics (DPD) simulations were employed to study the microstructures of an emulsion with alternating copolymers as the emulsifier. To model the alternating copolymers, an angular force was introduced by determining the stiffness parameters based on a linear quantitative structure-property relationship model. We studied the kinetics of emulsion formation by analyzing the time evolution of pressure, temperature, droplet number, the mean end-to-end distance and the morphologies of the emulsified oil droplets. The effect of emulsifier concentration on the mesostructures of the emulsified oil droplets was also discussed and the simulation results can interpret the experimental results on the microscopic level. Accordingly, the DPD method is a powerful tool for investigating emulsions with alternating copolymers and may be extended to drug delivery systems containing these copolymers. Source

Zhang Z.,South China University of Technology | Shi G.,South China University of Technology | Wang S.,South China University of Technology | Fang X.,South China University of Technology | Liu X.,Guangdong Industry Technical College
Renewable Energy

Here we demonstrate thermal energy storage cement mortar (TESCM) fabricated by integrating ordinary cement mortar with a composite phase change material (PCM) based on n-octadecane and expanded graphite (EG). The mass percentage of n-octadecane in the composite PCM can reach as high as 90% due to the excellent adsorption ability of EG, which endows the composite PCM with large latent heat. SEM images of the composite PCM show that n-octadecane is adsorbed into the pores of EG and uniformly covers on the nanosheets of EG, which microstructure contributes to preventing leakage of melted n-octadecane after it changes phase from solid state to liquid state. The n-octadecane/EG composite PCM has a good compatibility with ordinary cement mortar, and does not obviously deteriorate the apparent densities of the TESCM samples. Based on the thermal energy storage performance evaluation, it is found that the TESCM containing the n-octadecane/EG composite PCM plays a role in reducing the variation of indoor temperature, which helps to decrease the energy consumption for buildings. © 2012 Elsevier Ltd. Source

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