Manganese tetroxide(Mn_(3)O_(4))nanofibers were prepared by electrospinning homogeneous viscous solution of 20 wt%,28 wt%and 36 wt%manganese acetate in poly vinyl alcohol(PVA)and calcining the nanofibers at 1000℃for ...Manganese tetroxide(Mn_(3)O_(4))nanofibers were prepared by electrospinning homogeneous viscous solution of 20 wt%,28 wt%and 36 wt%manganese acetate in poly vinyl alcohol(PVA)and calcining the nanofibers at 1000℃for 2 h.Electrospinning was carried out at 9 kV DC with tip to collector distance(TCD)of 7 cm.Thermo gravimetric analysis(TGA)of the fibers indicates the pure phase of manganese oxide above 500℃.XRD analysis of calcined(at 1000℃)nanofibers indicates the formation of phase-pure tetragonal Mn_(3)O_(4).Scanning electron microscopy(SEM)studies show the fibers cylindrical with the diameters in the range of 100-600 nm and aspect ratio>1000.In general,the average diameter of the green fibers decreases with the increase in manganese acetate concentration.The diameter of calcined nanofibers is reduced by 34%.展开更多
In this work, we report the fabrication and cell affinity studies of the poly(vinyl alcohol) (PVA)/hyaluronic acid (HA) cross-linked nanofibers via electrospinning and post cross-linking. FT-IR and TGA analysis demons...In this work, we report the fabrication and cell affinity studies of the poly(vinyl alcohol) (PVA)/hyaluronic acid (HA) cross-linked nanofibers via electrospinning and post cross-linking. FT-IR and TGA analysis demonstrate that HA is not influenced by acid environment such as HCl vapor during cross-linking, and well incorporated into PVA nanofibers. Swelling behavior and cell adhesion of the PVA/HA hydrogel nanofibers are investigated and compared with pure PVA hydrogel nanofibers. It is expected that the nanofibrous PVA/HA hydrogel fibers could be a promising scaffold for cell culture and tissue engineering applications.展开更多
以聚乙烯醇(PVA)作为助纺剂,对疏水改性的海藻酸钠衍生物海藻酸辛酰胺(ACA)进行电纺性能研究。采用透射电镜、激光粒度和zeta电位分析仪、表面张力仪、电导率仪和流变仪对ACA的胶体界面性能进行表征,并采用扫描电镜、红外光谱仪和多晶X...以聚乙烯醇(PVA)作为助纺剂,对疏水改性的海藻酸钠衍生物海藻酸辛酰胺(ACA)进行电纺性能研究。采用透射电镜、激光粒度和zeta电位分析仪、表面张力仪、电导率仪和流变仪对ACA的胶体界面性能进行表征,并采用扫描电镜、红外光谱仪和多晶X射线衍射仪对ACA/PVA电纺纳米纤维膜的形貌、官能团和晶型结构进行测试。结果表明:疏水改性使海藻酸钠(SA)分子灵活性增强,ACA分子可以蜷曲形成水动力学粒径大小为324 nm(PDI=0.38),zeta电位为-43.8 m V的胶束。疏水改性和添加PVA助纺剂可以有效地降低SA溶液的表面张力和电导率,使其有效链缠结增多,ACA/PVA电纺纳米纤维膜的形貌更加规整均一。光谱分析结果表明,ACA和PVA两者间的氢键作用力是其增加链缠结点,实现静电纺丝的主要作用力。展开更多
文摘Manganese tetroxide(Mn_(3)O_(4))nanofibers were prepared by electrospinning homogeneous viscous solution of 20 wt%,28 wt%and 36 wt%manganese acetate in poly vinyl alcohol(PVA)and calcining the nanofibers at 1000℃for 2 h.Electrospinning was carried out at 9 kV DC with tip to collector distance(TCD)of 7 cm.Thermo gravimetric analysis(TGA)of the fibers indicates the pure phase of manganese oxide above 500℃.XRD analysis of calcined(at 1000℃)nanofibers indicates the formation of phase-pure tetragonal Mn_(3)O_(4).Scanning electron microscopy(SEM)studies show the fibers cylindrical with the diameters in the range of 100-600 nm and aspect ratio>1000.In general,the average diameter of the green fibers decreases with the increase in manganese acetate concentration.The diameter of calcined nanofibers is reduced by 34%.
文摘In this work, we report the fabrication and cell affinity studies of the poly(vinyl alcohol) (PVA)/hyaluronic acid (HA) cross-linked nanofibers via electrospinning and post cross-linking. FT-IR and TGA analysis demonstrate that HA is not influenced by acid environment such as HCl vapor during cross-linking, and well incorporated into PVA nanofibers. Swelling behavior and cell adhesion of the PVA/HA hydrogel nanofibers are investigated and compared with pure PVA hydrogel nanofibers. It is expected that the nanofibrous PVA/HA hydrogel fibers could be a promising scaffold for cell culture and tissue engineering applications.
文摘以聚乙烯醇(PVA)作为助纺剂,对疏水改性的海藻酸钠衍生物海藻酸辛酰胺(ACA)进行电纺性能研究。采用透射电镜、激光粒度和zeta电位分析仪、表面张力仪、电导率仪和流变仪对ACA的胶体界面性能进行表征,并采用扫描电镜、红外光谱仪和多晶X射线衍射仪对ACA/PVA电纺纳米纤维膜的形貌、官能团和晶型结构进行测试。结果表明:疏水改性使海藻酸钠(SA)分子灵活性增强,ACA分子可以蜷曲形成水动力学粒径大小为324 nm(PDI=0.38),zeta电位为-43.8 m V的胶束。疏水改性和添加PVA助纺剂可以有效地降低SA溶液的表面张力和电导率,使其有效链缠结增多,ACA/PVA电纺纳米纤维膜的形貌更加规整均一。光谱分析结果表明,ACA和PVA两者间的氢键作用力是其增加链缠结点,实现静电纺丝的主要作用力。
