Applied Mechanics and Materials Vol. 367

Abstract: EHD (Electrohydrodynamic) patterning forming micro structures with UV light curable materials at room temperature is investigated in this paper. It is a process for fabricating patterns on polymer film by applying electrical field to the template and the substrate as an electrode pair. The maintaining time of EHD patterning is reduced from several hours to tens of minutes by using UV curable polymer with low viscosity. The flat template generates the periodic pillars with micro scale. The periodic pillars with different period are obtained by varying the applied voltage in the different phase of experiment. The micro scale replication with good fidelity is produced by using patterned template made of doped silicon wafer.

Abstract: Thenovel Polyaniline/viscose fiber have been synthesized in situ by oxidativepolymerization of aniline with ammonium persulfate as an oxidant and viscose fiberas a template. It was found that the PANI particlesdeposited on the surface of viscose fiberconnected to form acontinuous network by taking along the viscose fiber template,which increases the thermal stability and electrical conductivity of viscose fiber.This work provides a new field of potential applications of conducting polymer.

Abstract: A nanocasting method using SBA-15 as a hard template was adopted to prepare mesoporous nanocrystalline ANbO₃ (A = Li, Na, and K) samples. The characteristics of samples werecharacterized by techniques such asXRD, N₂-sorption measurement, HRTEM and UVDRS. It was found that thealkality of the alkali metals could have profound impacts on the synthesis andthe physical properties of samples. The Li, Na, and K precursors can reacteasily with the siliceous template, and the reactivity varies with the alkalityof the alkali metal. The synthesis of KNbO₃ is unsuccessful because of the high alkality ofK. The templated LiNbO₃ andNaNbO₃ consist of single crystalline nanoparticles that generate interparticle mesoporosity. The LiNbO₃andNaNbO₃ samples showed notably enhanced photocatalytic activitiesfor 2-propanol photodegradation in comparison to the counterparts prepared bythe solid state reaction.

Abstract: Mercury and its compounds which formed in the coalcombustion process have a serious effect on the environment. Four coal samplesin Chongqingwere selected to study on the occurrenceform of mercury, as well as the effect ofsulfur, chlorine on mercury speciation. Results showed that the mercury contentin coal ranged from 257 ng/g to 332.7 ng/g，with sulfur, chlorine content increased，the total mercury content increased，too. The sulfur content in coal ranged from 1.52% to3.54%, the mercury in sulfide and sulfurhave a good correlation, and square of the correlation coefficient (R²)between them is 0.9883. The chlorinecontent in coal ranged from 0.05% to 0.15%，the mercury in organic compound and sulfur have a good correlation，andsquare of the correlation coefficient (R²) between them is 0.9639.

Abstract: Na₂SiO₃·9H₂O and NaAlO₂are used as raw materials to synthesize analcime molecular sieve with hydrothermal synthesis. Theinfluence of SiO₂/Al₂O₃ ratio, mixing time,aging time, crystallize temperature， crystalize time are also discussed to determine theparameters of synthesis.

Abstract: The Ge doped Sb₂Te thin films (Ge₂Sb₂Te₅, Ge_0.15Sb₂Te and Ge_0.61Sb₂Te) were deposited by magnetron co-sputtering using Ge and Sb₂Te targets. Ge doping effect on the phase transition behaviors and thermal conductivity of the composite films was investigated. Ge_0.61Sb₂Te thin films have higher crystallization temperature (~200°C), larger crystallization activation energy (~3.28 eV) , better data retention (~120.8 °Cfor 10 years) and lower thermal conductivity (~0.23 W/mK). Ge_0.61Sb₂Te thin films is considered to be a promising storage medium for phase change random access memory due to its better thermal stability and lower power consumption.

Abstract: This paper reports on the influence of environment gas on the brass film and tribological behavior of brass (Cu64Zn36) / steel (AISI 1045) couple. The friction coefficient and the wear rate of brass/steel were measured in ambient air, in pure oxygen at 105 Pa and in vacuum at 5x10-5 Pa. In this study, the mechanism of transfer brass film on steel substrate has been studied with the scanning electronic microscope, the optical microscope and the interferential microscope. The analysis shows that the transfer films properties (roughness, hardness, thickness) depend on the atmospheric conditions. The brass film has an ellipsoidal surface in air and in oxygen with two differents thickness. However, in vacuum, the transfer film produced by a discontinuous adhered particles on the disc. The largest wear rate is obtained when using pur oxygen and the largest friction coefficient µ was measured in ambient air. The smallest friction coefficient and wear rate are obtained in vacuum. The results also showed that the granular film produced in vacuum has a good effect on tribological behavior of brass/steel couple.

Abstract: Theoretical prediction of mechanical properties using Artificial Neural Network (ANN) of a new beta-titanium alloy was investigated and compared with the experimental results obtained as a function of heat treatment. The cold worked biomaterial was subjected to different thermal processing cycles. The experimental values of mechanical properties were determined using MTS Landmark-servo hydraulic UTS machine. The new beta-titanium alloy demonstrated an excellent combination of strength and ductility for β-annealing and solution treatment plus aging thermal processing treatments. This data was used to train an artificial neural network (ANN) model to predict hardness. The predicted hardness values were found to demonstrate very good agreement with the experimental values.

Abstract: Chitosan nanoparticles were prepared by crosslinkingusing TPP. SEM showed that chitosan nanoparticles were successfully obtained.The adsorption characteristics of chitosan nanoparticles were evaluated. Theresults demonstrated that chitosan nanoparticles were suitable for adsorbent toremoval Pb²⁺. The parameters for the adsorption of Pb²⁺by chitosan nanoparticles were also determined. It was shown that chitosannanoparticles were fit for Langmuir’s isotherm model and that the adsorptionkinetics of Pb²⁺ described by the pseudo-second-order model could bebest.