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Fabrication of titanium-based alloys with bioactive surface oxide layer as biomedical implants:Opportunity and challenges

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Transactions of Nonferrous Metals Society of China 2022年第1期32卷 1-44页

作者： Mohamad Rodzi SITI NUR HAZWANI Ling Xin LIM zainovia lockman Hussain ZUHAILAWATI Biomaterials Niche Area Group School of Materials and Mineral Resources EngineeringUniversiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia

Titanium and its alloys have long been used as implant materials due to their outstanding mechanical properties and apparent *** this,the search for better alloys has continued to be active by researchers and industries alike,as there are still pressing issues that require *** include(1)a large mismatch in the elastic modulus of the implant material,which causes a stress shielding problem;(2)the release of harmful ions from Ti alloys after long-term use;(3)a low bioactivity of the Ti alloy surface,which prolongs the healing *** research has been directed toward finding new generation Ti alloys composed of more biocompatible phases and modifying the surface of Ti alloys from naturally bio-inert to bioactive in order to circumvent the *** review examines recent work reported on the fabrication of Ti alloys,and based on the survey,major characteristics highlighted the importance of elastic modulus and the use of non-toxic metal elements to improve *** terms of surface modification of Ti alloys,numerous studies have found that a nano-scaled surface oxide layer grown on the surface is always beneficial to improving the bioactivity of Ti alloys for rapid recovery after *** comprehensive review focuses on the appropriate phase and composition for new Ti alloys intended for use as biomedical implants,emphasizing both fabrication and surface modification methods.

关键词： titanium alloy orthopedic application surface modification TiO_(2)nanotubes

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Formation of Truncated Hexagonal Bipyramid Cobalt Superstructures via a Polyol Route and Its Magnetic Properties

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材料科学与工程：中英文版 2011年第4期5卷 378-385页

作者： Khe Cheng Seong Azizan Aziz zainovia lockman School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus 14300 Nibong TebalPenang Malaysia

Cobalt powders consisting of three-dimensional truncated hexagonal bipyramid superstructures with an average size of 0.5 microns were formed by a polyol route in the presence of the non-ionic surfactant polyvinylpyrroridone K30. Transmission electron microscopy, scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray analysis and vibrating sample magnetometer were used to characterize the samples. It was observed that polyvinylpyrroridone K30 plays a crucial role in the formation of the truncated hexagonal bipyramid superstructure. Without polyvinylpyrroridone K30, only quasi-spherical particles were observed. With the incorporation of polyvinylpyrroridone K30, three dimensional cobalt truncated hexagonal bipyramid superstructures, which have never been previously reported, were found. Reaction time may also contribute to this three dimensional hexagonal structure. This unique superstructure exhibited ferromagnetic behavior.

关键词：多元醇双锥钴粉振动样品磁强计非离子型表面活性剂透射电子显微镜扫描电子显微镜上层建筑

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