题 目：Aging effects on Antimicrobial Properties with Nano-Cluster-Doped Low Friction Amorphous Carbon Coatings for Space Applications
嘉 宾：孙海林 英国梯尔镀层有限公司 董事会成员/技术总监
时 间：2024年3月1日 星期五 9:30--12:00
地 点：交叉二号楼 B2005
Abstract: Inside a space station, it is essential for maintaining the temperature and humidity for the human crew onboard. It also creates an ideal breeding environment for the proliferation of bacteria and fungi which present a hazard to human health and create issues for the safe running of equipment. Low friction wear-resistant coatings are commonly used for many key components inside of the space aircraft. The combined properties from both the mechanical and antimicrobial thin films prepared by magnetron sputtering with size-controlled nano clusters were developed. The longevity of these antimicrobial coatings, which is heavily influenced by metal diffusion within the coating, was also investigated. Silver and copper are among the most studied active bactericidal materials; thus, this work investigated the antibacterial properties of amorphous carbon coatings, doped with either silver or copper clusters.
With a conventional approach, amorphous carbon coatings were prepared by co-sputtering, to generate coatings that contained a range of silver and copper concentrations. In addition, coatings containing silver clusters were prepared using a separate cluster source to better control the metal particle size distribution in the amorphous carbon matrix. Antibacterial tests were performed under both terrestrial gravity and microgravity conditions, to simulate the condition in space. Results show that although silver doped coatings possess extremely high levels of antimicrobial activity, silver cluster doped coatings are equally effective, whilst being more long-lived, despite containing a lower absolute silver concentration.
The mechanism of Ag diffusion inside the carbon matrix has been carefully analysed. Controlling the Ag cluster diffusion rate will create the balance of both longevity of the antimicrobial lifetime and replenishment of those lost Ag particles in time, which would severely impair the coatings' antimicrobial activity. Therefore, it becomes apparent and critical to identify the key factors that influence the Ag diffusion rate in a carbon matrix.
Biography：孙海林，英国Birmingham大学冶金与材料学院博士、工业博士导师，现任英国梯尔镀层有限公司董事会成员、技术总监。曾先后参与主持20多项欧共体大型项目研究，授权国际及国内专利20余项，各类国际杂志以及国际会议上发表研究论文30余篇。曾担任上海交通大学客座研究员、汽车合作实验室副主任（领域：氢燃料电池双极板）、表面工程研发中心学术委员会副主任。
