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Wei Lin,Linli Fan,Dunmin Lin,Qiaoji Zheng,Ximing Fan,Hailing Sun 한국물리학회 2013 Current Applied Physics Vol.13 No.1
Lead-free piezoelectric ceramics Ba1xCaxTi1yZryO3þ1mol%CuO were prepared by an ordinary sintering technique and the effects of Ca2þ and Zr4þ on phase transition and electrical properties of the ceramics were studied. The results of X-ray diffraction show that the ceramics exhibit a pure perovskite structure at 0 x 0.175 and 0 y 0.175, suggesting that Ca2þ and Zr4þ diffuse into BaTiO3 lattices to form a solid solution. The substitution of Zr4þ for the B-site Ti4þ ions of BaTiO3 decreases greatly Curie temperature TC and strengthens the relaxor character of the ceramics, while the addition of Ca2þ has a weak influence on TC and leads to an inhibition of grain growth. Owing to the more possible polarization states resulting from the coexistence of tetragonal and orthorhombic phases near room temperature, the ceramics with x ¼ 0.075e0.125 and y ¼ 0.1 exhibit excellent piezoelectric properties: d33 ¼ 254e345 pC/N and kp ¼ 38.0e45.2%, respectively.
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Wang Xinzhe,Li Siqi,Yu Honglian,Lv Jianzhi,Fan Minglun,Wang Ximing,Wang Xin,Liang Yanting,Mao Lingna,Zhao Zhankui 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.3
BACKGROUND: Nowadays, biological tissue engineering is a growing field of research. Biocompatibility is a key indicator for measuring tissue engineering biomaterials, which is of great significance for the replacement and repair of damaged tissues. METHODS: In this study, using gelatin, carboxymethyl chitosan, and sodium alginate, a tissue engineering material scaffold that can carry cells was successfully prepared. The material was characterized by Fourier transforms infrared spectroscopy. In addition, the prepared scaffolds have physicochemical properties, such as swelling ratio, biodegradability. we observed the biocompatibility of the hydrogel to different adult stem cells (BMSCs and ADSCs) in vivo and in vitro. Adult stem cells were planted on gelatin-carboxymethyl chitosan-sodium alginate (Gel/SA/CMCS) hydrogels for 7 days in vitro, and the survival of stem cells in vitro was observed by live/died staining. Gel/SA/CMCS hydrogels loaded with stem cells were subcutaneously transplanted into nude mice for 14 days of in vivo culture observation. The survival of adult stem cells was observed by staining for stem cell surface markers (CD29, CD90) and Ki67. RESULTS: The scaffolds had a microporous structure with an appropriate pore size (about 80 lm). Live/died staining showed that adult stem cells could stably survive in Gel/SA/CMCS hydrogels for at least 7 days. After 14 days of culture in nude mice, Ki67 staining showed that the stem cells supported by Gel/SA/CMCS hydrogel still had high proliferation activity. CONCLUSION: Gel/SA/CMCSs hydrogel has a stable interpenetrating porous structure, suitable swelling performance and degradation rate, can promote and support the survival of adult stem cells in vivo and in vitro, and has good biocompatibility. Therefore, Gel/SA/CMCS hydrogel is a strong candidate for biological tissue engineering materials.
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Lingling Fu,Dunmin Lin,Qiaoji Zheng,Xiaochun Wu,Lang Wu,Hailing Sun,Yang Wan,Ximing Fan,Chenggang Xu 한국물리학회 2012 Current Applied Physics Vol.12 No.6
Lead-free ceramics (1-x)NaNbO3-xBi0.5Li0.5TiO3 have been fabricated by an ordinary sintering technique,and their electric properties and temperature characteristics have been studied. All the ceramics possess a perovskite structure with orthorhombic symmetry, indicating that (Bi0.5Li0.5)TiO3 diffuses into NaNbO3 lattices to form a new solid solution. A low (Bi0.5Li0.5)TiO3 doping level transforms the NaNbO3ceramics from antiferroelectric to ferroelectric. The ceramics with x ≤ 0.075 are normal ferroelectric, and the ferroelectric-paraelectric phase become diffusives with the doping level of Bi0.5Li0.5TiO3 increasing. As x increases, the Curie temperature of the ceramics decreases linearly, while the relative permittivity εr increases. 0.925NaNbO3e0.075(Bi0.5Li0.5)TiO3 ceramic exhibits the relatively large piezoelectric constant (d33 = 58 pC/N), high Curie temperature (TC = 228 ℃) and good temperature stability, suggesting that the ceramics are one of new possible candidates for lead-free piezoelectric materials. Lead-free ceramics (1-x)NaNbO3-xBi0.5Li0.5TiO3 have been fabricated by an ordinary sintering technique,and their electric properties and temperature characteristics have been studied. All the ceramics possess a perovskite structure with orthorhombic symmetry, indicating that (Bi0.5Li0.5)TiO3 diffuses into NaNbO3 lattices to form a new solid solution. A low (Bi0.5Li0.5)TiO3 doping level transforms the NaNbO3ceramics from antiferroelectric to ferroelectric. The ceramics with x ≤ 0.075 are normal ferroelectric, and the ferroelectric-paraelectric phase become diffusives with the doping level of Bi0.5Li0.5TiO3 increasing. As x increases, the Curie temperature of the ceramics decreases linearly, while the relative permittivity εr increases. 0.925NaNbO3e0.075(Bi0.5Li0.5)TiO3 ceramic exhibits the relatively large piezoelectric constant (d33 = 58 pC/N), high Curie temperature (TC = 228 ℃) and good temperature stability, suggesting that the ceramics are one of new possible candidates for lead-free piezoelectric materials.
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