| 1 | 静电纺取向性聚己内酯微纳纤维的制备及表征显示文摘采用静电纺丝法制备取向性聚己内酯微纳纤维,通过单因素分析法考察电极距离、溶液喷射速度、电压、针头型号、接收距离和溶液体积对取向性聚己内酯微纳纤维性能的影响。将质量分数为10%的聚己内酯(polycaprolactone,PCL)溶液注入2mL的注射器,设置静电纺丝机电极距离分别为1,2,3,4,5cm,喷射速度分别为0.053,0.088,0.106mL/h,电压分别为18.8,20.8,22.6kV,针头型号分别为19,21,25,接收距离分别为15,19,21cm,体积分别为0.3,0.5mL,制备不同取向分布的PCL纤维。采用光学显微镜观察纤维形貌,并进一步采用接触角测试、力学性能测试、稳定性评价等方法对材料性能进行表征。结果表明:不同的参数下可以得到不同取向性的PCL纤维分布;当电极距离为4cm、溶液体积为0.3mL、电压为18.8kV、喷射速度为0.088mL/h、接收距离为15cm、针头型号为19时,静电纺PCL微纳纤维取向性最佳,且具有较好的润湿性能、力学拉伸性能以及良好的稳定性。 | 张李玲 高婷婷 陈施瑜 刘莎 张鲁中 姚登兵 李贵才 杨宇民 | 2019 | 南通大学学报(自然科学版)2019，18，1： | 2 |
| 2 | Some new mesoscopic crossover length scales concerning the Hamaker constant显示文摘The last three decades have witnessed a global surge in nano-and micro-mechanics driven by the rapid development of nanotechnology,microelectromechanical systems(MEMS)and nanoelectromechanical systems(NEMS)[1].Although a generally accepted framework is still lacking for mesoscopic mechanics,four broad categories of viewpoints have been agreed upon[2]:(1)Continuum mechanics works quite well even for a few atoms in diameter.In 1997,Richard E.Smalley(1943-2005),the late Nobel laureate,and Yakobson[3]once commented:“The behavior of the hollow tubules is complex,but still predictable with continuum-elastic methods.In its applications to nanotubes,the correspondence between the elastic model and molecular dynamics is remarkable.The laws of continuum mechanics are amazingly robust and al-low one to treat even intrinsically discrete objects only a few atoms in diameter.” | ZHAO YaPu | 2019 | Science China(Technological Sciences)2019，62，12： | 0 |
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