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RISS 인기검색어
- 검색키워드
- 저자 : Mehran Solati-Hashjin (검색결과 2 건)
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Hossein Eslami,Mehran Solati-Hashjin,Mohammadreza Tahriri 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.3
Fluorinated hydroxyapatite (FHA; fluorhydroxyapatite) powder was synthesized through a pH-cycling method by varying the sodium fluoride [NaF] concentration in a hydroxyapatite suspension as a modified wet-chemical process. The powder sample was characterized by the commonly used bulk techniques of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), F-selective electrode, atomic absorption spectroscopy (AAS) and EDTA titration analyses. SEM was used to estimate the particles size of the powder and observe the morphology and agglomeration state of the powder. The functional groups presented in the synthesized powder were ascertained by FTIR investigations. AAS and EDTA titration techniques were employed for calculation of the Ca/P molar ratio. F-selective electrode analysis also was used to measure the fluorine (F) content in the crystalline network of the synthesized powder. Finally, the FHA and other phases according to processing parameters were observed by XRD analysis Fluorinated hydroxyapatite (FHA; fluorhydroxyapatite) powder was synthesized through a pH-cycling method by varying the sodium fluoride [NaF] concentration in a hydroxyapatite suspension as a modified wet-chemical process. The powder sample was characterized by the commonly used bulk techniques of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), F-selective electrode, atomic absorption spectroscopy (AAS) and EDTA titration analyses. SEM was used to estimate the particles size of the powder and observe the morphology and agglomeration state of the powder. The functional groups presented in the synthesized powder were ascertained by FTIR investigations. AAS and EDTA titration techniques were employed for calculation of the Ca/P molar ratio. F-selective electrode analysis also was used to measure the fluorine (F) content in the crystalline network of the synthesized powder. Finally, the FHA and other phases according to processing parameters were observed by XRD analysis
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Ghazal Belgheisi,Masoumeh Haghbin Nazarpak,Mehran Solati‑Hashjin 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Currently, material synthesis and processing developments allow the design of increasingly advanced scaffolds for bone tissue engineering. The purpose of this study is to fabricate hybrid scaffolds by embedding electrospun polycaprolactone (PCL) or layered double hydroxides (LDH)/PCL nanofiber mats into 3D printed circular PCL grids with 400 µm strands using a PCL solution as glue. Structural analysis revealed that LDH increased surface roughness in PCL mats in addition to reducing fiber diameter. FESEM images showed that the size of the 3D printed strands and pores was about the same as in the original design, and nanofiber mats were flawlessly placed between the 3D printed grids. The porosity of the scaffolds was determined through BET analysis. Young’s modulus of the scaffolds was determined using a compressive test conducted in dry and wet conditions. Hybrid scaffolds with LDH/PCL nanofiber mats showed significantly higher Young’s modulus than 3D printed grids and hybrid scaffolds with PCL nanofiber mats (P < 0.05). In vitro studies showed the positive effect of LDH on enhancing hybrid scaffolds’ bioactivity and biodegradation rate. The calcium/phosphate ratio in the hybrid scaffold containing LDH was closer to the stoichiometric calcium/phosphate ratio in natural bone. MG-63 cell lines were cultured to assess the scaffold’s biocompatibility. Cell adhesion, alkaline phosphatase activity, and calcium deposition were significantly enhanced in hybrid scaffolds with LDH/PCL nanofiber mats. Considering the results, this hybrid scaffold exhibits favorable bone tissue engineering characteristics.
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