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J. Korean Ceram. Soc. > Volume 61(3); 2024 > Article
Journal of the Korean Ceramic Society 2024;61(3): 436-444.
doi: https://doi.org/10.1007/s43207-023-00351-z
Preparation of  Si3N4-based antimicrobial coatings from suspensions with long-time stability
Songmo Du1 , Jie Zhang2, Siyuan Sun3, Fei Li1, Zhanglin Chen1, Shijia Zhang1, Shuo Zhao1, Zhaobo Tian4, Xiaoshan Ning1, Kexin Chen1, Wei Cui1,5, Guanghua Liu1
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute and Institute of Materials Research, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518057, China
3Chinese Academy of Engineering Innovation Strategy, Beijing 100088, China
4Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
5Foshan (Southern China) Institute for New Materials, Foshan 528000, Guangdong, China
Correspondence  Jie Zhang ,Email: zjzj0517@gmail.com
Wei Cui ,Email: 18146528905@163.com
Guanghua Liu ,Email: liugh02@163.com
Received: July 29, 2023; Revised: October 31, 2023   Accepted: November 21, 2023.  Published online: February 16, 2024.
A Si3N4-based antimicrobial coating was fabricated from suspensions with long-time stability. The stability of Si3N4 suspension and the antimicrobial performance of coating were investigated. The viscosity of Si3N4 suspension was found to be the key factor affecting both stability and antimicrobial performance. The Si3N4 suspensions were modified with HASE acrylic copolymer, PAA-NH4, and Polyurethane, resulting in an improvement of the stability of Si3N4 suspension from a few hours to six months. The coating produced using the modified Si3N4 suspension exhibited an antibacterial activity of 99.9%. This study highlights the crucial role of modifying the Si3N4 suspension in improving its long-term stability and coating antimicrobial activity.
Key words: Silicon nitride  · Surface chemistry  · Viscosity  · Stability  · Antimicrobial
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