Papers by Keyword: Surface Modification

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Authors: Saiful Izwan Abd Razak, Noor Fadzliana Ahmad Sharif, Nadirul Hasraf Mat Nayan, Ida Idayu Muhamad
Abstract: This paper reports the properties of newly developed electrically conductive natural fiber made up of pineapple leaf fiber (PALF) and conducting polyaniline (PANI). The results revealed that the in situ coating of PANI (1 wt.%) showed minimal reduction on the PALF tensile strength. Percolation concentration of the PANI was observed at 5 wt.% and its corresponding electron micrograph showed good polymer deposition with the characteristic globular PANI formation plus no fiber damages. This fiber material has potentials for many applications such as composites, electroactive fillers and conductive sheets.
Authors: Feng Cao, Dong Xu Li, Zheng Ying Wu
Abstract: Hollow silica microspheres with porous surface were synthesized by using the pollen grains as biotemplate through an in-situ synthesis process, in which the pollen grains were surface modified by ammonium oleate. Scanning electron microscopy, Fourier transform infrared spectroscopy and nitrogen adsorption-desorption porosimetry analyzer were applied to investigate the as-prepared microspheres. Bovine serum albumin was used as the model drug to estimate the adsorption property. And the effect of the different amount of tetraethoxysilane during the synthesis process were discussed in this paper. Results indicated that the hierarchical network of the pollen wall could be well replicated through this method, in which the hydrophobic interaction between the pollen wall and surfactant as well as the electrostatic interaction between the surfactant and the hydrolysate of tetraethoxysilane were considered as the key factors for the replication. The hollow silica microspheres have loading capacity for the model drug, and the adsorption property of this microsphere could be easily adjusted by changing the amount of tetraethoxysilane.
Authors: Daniel Trauth, Michael Terhorst, Patrick Mattfeld, Fritz Klocke
Abstract: Machine hammer peening is an incremental forming process for high frequency surface finishing of technical components. Recently, machine hammer peening has attracted automotive industry’s attention for the surface finishing and structuring of deep drawing tools. Deep drawing tools surface structured by machine hammer peening are characterized by beneficial friction and wear characteristics in lubricated sliding contacts. However, the physics of hydrodynamic effects in machine hammer peened structures is yet insufficiently researched. Therefore, this work investigates the hydrodynamic effects in surface structures generated by machine hammer peening using a two-dimensional computational fluid dynamic analysis. The effects of structure geometry, structure arrangement and selected sliding parameters on the hydrodynamic fluid pressure and velocity distribution within the structures are analysed. It was observed, that the sliding direction and the structure arrangement have a significant influence on the hydrodynamic fluid pressure maximum.
Authors: Chao Yong Zhao, Hu Li, T. Yuan, Hong Song Fan, Xing Dong Zhang, Zhong Wei Gu
Abstract: This study was carried out to investigate the effect of acid-alkali treatment and alkaliheat treatment on the push-out strength and tissue response of the porous titanium in vivo. Porous titanium with different treatment was implanted in dog bony site for 2 months and 5 months and the push-out strength was tested. At 2 months, the mean push-out strengths of the acid-alkali treated and alkali-heat treated porous titanium were 11.3 and 15 MPa, respectively. At 5 months, the values reached 29.8 and 35 MPa, respectively. Histological observation showed a close contact between implants and bone, and more bone tissue filled inside the pores of porous titanium increasing with implantation time. The results indicated higher bonding strength between bone and porous titanium in alkali-heat treated samples. Therefore, alkali-heat treatment can provide porous titanium implants with better fixation as a bone substitute for clinical use under load-bearing conditions.
Authors: Guang Xian Zhang, Fang Xu, Wei Hu, Feng Xiu Zhang
Abstract: In this paper, a durable superhydrophilic modification was applied to polyester fabric to improve its wettability- HAS treatment. The wetting ability of HAS treated polyester fabric improved a lot; the water contact angle could decrease to 00 in 3s; the water content increased up to 115%; the wicking distance increased up to 15cm; spraying rate improved to 1 degree. The wearability tests showed the breaking strength and creasability remain almost the same as untreated polyester fabric.
Authors: Yan Chen, Hai Ying Zhu, Yan Hua Lei, Wei Wei Sun, Yun Ping Liu, Shou Gang Chen
Abstract: A 3, 4-dihydroxyphenethylamine (dopamine) polymer film has been prepared on copper surface from 2.0g/L dopamine solution in tris(hydroxymethyl)aminomethane hydrochloride (Tris-HCl) buffer solution at pH 8.5 by a simple solution-immersion method. The dopamine self-polymerized and adhered to the copper surface firmly in aqueous environment. The film surface was evaluated through SEM, EDS, XPS and contact angle measurement. The results have shown that the film was indeed formed on copper surface. And this research offers a versatile approach for the surface modification.
Authors: Zhi Jun Cao, Jia Chen Liu, Li Bin Liu, Hao Ye, Yan Qiu Wei
Abstract: A new approach was developed for surface modification of metallic surface. By treating nano-zirconia particles and metal surface in different charge state, nano-zirconia particles can be dispersedly inlaid in metal surface owing to electrostatic and nanometer effects. By using this method, metal components of complex shapes, especially those having inside surfaces, might be easily improved, i.e., enhanced surface hardness and wear rate.
Authors: S. Mohanasundaram, S.J. Vijay, M. Karthikeyan
Abstract: Friction surfacing is an localized surface modification process of depositing consumable materials over substrate. FS, utilizes FSW technology allows joining of materials while avoiding the brittle intermetallic formations, involving temperatures below melting point and producing fine grained structure, results in exhibiting bond integrity and enhanced surface properties, reducing the costs associated with energy consumption and consumables. The process is used for corrosion and wear resistant coatings and for reclamation of worn engineering components and for coating components using dissimilar materials. This review presents the essentials of FS, parameters used, performance features of this technique. This describes the influence of the process parameters on surface properties of the surface composites produced and evaluated of the different materials. The FS is compared with other coating processes, and some of the applications are emphasized. The paper also discusses on few trails of FS made by the authors and the results of which is presented.
Authors: Xing Fang Wu, Ying Fu, Yong Han, Wen Shen Hua, Si Ze Yang
Authors: Zhao Ming Liu, Gao Feng Quan, Ying Bo Zhang
Abstract: A new technique has been developed by infiltration during casting process to AZ91D magnesium alloy part. Through a melting process a alloyed surface layer was formed on the surface of the part in casting process, and the surface layer helps improve the corrosion resistance. The macro morphology, thickness, microstructure and properties of the layer were analyzed by digital, scanning electron microscopy, spectroscopy and corrosion measurement system. The results show that a uniform and dense infiltration layer on the surface of AZ91D part was obtained. This technique can fundamentally change the physical and chemical properties of magnesium alloy parts. More importantly, it is low-cost, green and environmental protection.
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