Search

Your search keyword '"Su, Yingchao"' showing total 178 results
Start Over Author "Su, Yingchao"
178 results on '"Su, Yingchao"'

44. Development and characterization of silver containing calcium phosphate coatings on pure iron foam intended for bone scaffold applications

Author

Hermawan, Hendra, Su, Yingchao, Mantovani, D. (Diego), Tolouei, Ranna, Champagne, Sébastien, Trenggono, Adhitya, Hermawan, Hendra, Su, Yingchao, Mantovani, D. (Diego), Tolouei, Ranna, Champagne, Sébastien, and Trenggono, Adhitya

Abstract

Despite its high structural strength and degradability, the potentiality of pure iron foam for bone scaffolds is low due to its lack of surface bioactivity. This work aims to provide a surface bioactivity to the iron foam by developing a calcium phosphate (CaP) conversion coating. Silver (Ag), known for its antibacterial property, was then incorporated onto the CaP coating via co-deposition (Ag/CaP-c) and post-treatment (Ag/CaP-p). By tuning the Ca/P ion ratio and Ag concentration during the coating process, an optimum coating parameter was obtained. All coatings were found to enhance mineralization ability and mechanical integrity of the iron foam over time. Electrochemical and immersion tests indicated that the coatings regulated the degradation rate of the iron foam via a variation of coating resistance and capacitance. Silver ions were released slowly from the Ag/CaP coating during the immersion test indicating a potential long-term antibacterial property of the coating. Details on the coating design and process optimization, the effects of three different simulated physiological solutions, and the mechanical property of the coated iron foam are discussed in this report.

Published
2018

45. Calcium phosphate coatings enhance biocompatibility and degradation resistance of magnesium alloy: Correlating in vitroand in vivostudies

Author

Gao, Julia, Su, Yingchao, and Qin, Yi-Xian

Abstract

Magnesium (Mg) and its alloys are promising biodegradable materials for orthopedic applications. However, one of the major problems is their rapid degradation rate with quick evolution of hydrogen gas. To overcome this problem, calcium phosphate (CaP) coatings have been used to improve the degradation resistance and the biocompatibility of Mg materials. This study focuses on the comparison and correlation of the in vitroand in vivodegradation and biocompatibility behaviors of these materials. A CaP coating consisting of dicalcium phosphate dihydrate (DCPD) was deposited on an AZ60 Mg alloy by the chemical conversion method. Then, the in vitrodegradation testing including electrochemical and immersion tests, and in vivoimplantation of the CaP coated Mg alloy were conducted to compare the degradation behaviors. Next, the in vitrocell behavior and in vivobone tissue response were also compared on both uncoated and CaP-coated Mg samples. Data showed that the CaP coating provided the Mg alloy with significantly better biodegradation behavior and biocompatibility. The in vitroand in vivobiocompatibility tests exhibited good consistency while not the case for biodegradation. Results showed that the in vitroelectrochemical test could be a quick screening tool for the biodegradation rate, while the in vitroimmersion degradation rate was often 2–4 folds faster than the in vivodegradation rate.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results