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Preparation, thermal cure and ceramization of liquid precursors of SiC–ZrC
Chuanjin Huang,Zhehui Wang,Mingcun Wanga 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Liquid PEPSI–PZO, as precursor of SiC–ZrC multi-component ceramic, was prepared by facile reactiveblending method, using phenylethynylpolysilane (PEPSI) as silicon and carbon source and polyzirconoxanesal(PZO) as zirconium source. The processing capability of PEPSI–PZO met the demands ofPrecursor-infiltration–pyrolysis technique (PIP) in ceramic composites fabrication. The thermal cure wasrealized at 130–330 8C by ethynyl polymerization and condensations. The thermal cure of PEPSI–PZOprecursor was promoted by catalyst Ni(acac)2, and the curing initiation and curing peak temperaturesdecreased by 25 and 70 8C, respectively. Evidenced by ceramic yields and XRD results, the thermalpyrolysis was catalyzed by Ni(acac)2, (ceramic yield was improved by 5–10%). XRD and SEM-EDS resultsshowed that SiC–ZrC by 1600 8C pyrolysis was highly crystalline, due to the occurrence of carbothermalreduction reaction. The liquid precursor of SiC–ZrC is an ideal candidate of low cost precursors for hightemperatureceramics and ceramic matrix composites.
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Research Progress of Three-Dimensional Bioprinting Artificial Cardiac Tissue
Mao Xin,Wang Zhehui 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.1
Cardiovascular disease is one of the main diseases that endanger human life and health, and heart failure often occurs when the cardiovascular disease develops to the end-stage. Heart transplantation is the most effective treatment. However, there has always been a shortage of living heart organs. With the development of regenerative medicine, researchers have turned to bioprinting technology that can build tissues and organs in vitro. A large number of relevant literature on three-dimensional (3D) bioprinted hearts were searched and screened in Google Scholar. 3D bioprinting technology can accurately print biomaterials containing living cells into 3D functional living tissues, providing a feasible solution to the shortage of transplantable organs. As one of the most important organs in the human body, the research on 3D bioprinting of the heart has currently become a hot topic. This paper briefly overviews 3D bioprinting technology and the progress in bioprinting cardiac tissue. It is believed that in the future, bio-printed hearts will become a reality, making a new way of providing artificial organs for heart transplantation.
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