摘要
为探究熔体静电直写制备过程中电极正接与反接造成的差异,利用ANSYS对不同高压静电加载形式下纺丝区间的电场强度大小、分布以及电场方向进行了模拟分析,并从产生射流临界电压、射流速度、纤维直径、纤维沉积精度等方面进行了实验对比。模拟结果与实验结果相互印证:电极正接的情况下喷头处电场强度较反接高出14%左右,纤维直径更细,射流速度更快,相同距离下产生射流所需要的临界电压仅为反接的35%~74%;电极反接的情况下接收板位置电场强度较正接高35%左右,电场强度分布更加均匀,电场方向更加一致,更有利于提高纤维在电场中的稳定性,纤维沉积偏差较正接降低35%~51%。
Objective In recent years,melt electrowriting has attracted wide attention in biomedicine,especially in tissue engineering.The loading mode of electrodes in melt electrowriting may effluent the electrostatic distribution thus further effluent the jet deposition controlling.Relatively few studies have been conducted at home or abroad,and the difference in the effect of positive and negative high voltages loading is not completely clear.In this paper,the electric fields under two kinds of high voltage electrostatic loading are simulated,and the specific experiments are analyzed and compared to determine the influence of the two conditions on the performance parameters of melt electrowriting preparation.Method In order to explore the difference between the positive electrode connection and the reverse electrode connection in the preparation process of melt electrowriting,ANSYS was employed to simulate the magnitude,distribution and direction of the electric field in the spinning area under different high-voltage electrostatic loading.Experimental investigation was conducted to analyze the critical voltage of jet generation,jet velocity,fibers diameter,and fibers deposition accuracy.Results The simulation and the experimental results confirm each other.In the case of positive electrode connection,the electric field strength at the nozzle is about 14%higher than that of the reverse connection(Fig.3),the fibers are thinner(Fig.7),and the jet velocity is faster(Fig.8).The critical voltage required to generate a jet at the same distance is only 35%to 74%of the reverse connection(Fig.5).In the case of reverse electrode connection,the electric field strength of the receiving plate is about 35%higher than that of the positive connection(Fig.3),the distribution of electric field strength is more uniform,and the direction of electric field is more consistent,which is more conducive to improving the stability of the fibers in the electric field,and the fibers deposition deviation is reduced by 35%-51%compared with that in condition positive connection(Tab.2).Conclusion Method that high voltage was loaded on the spinning head,enabled higher electric field intensity at the spinning area,which is more conducive to jet generation and tensile refinement,and the use of this method could improve the adaptability of melt electrowriting to materials with high viscosity.Method that high voltage was loaded on the receiving plate,enabled higher electric field intensity near the receiving area,more uniform electric field distribution and smaller component of electric field vector along the horizontal direction near the receiving plate,which could reduce the instability of jet flow and improve the deposition accuracy.These results suggested that we could connect the spinning head and the receiving plate with the opposite high voltages at the same time,taking the advantages of the two electric fields loading modes.
作者
李好义
贾紫初
刘宇亮
谭晶
丁玉梅
杨卫民
牟文英
LI Haoyi;JIA Zichu;LIU Yuliang;TAN Jing;DING Yumei;YANG Weimin;MU Wenying(State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China;College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Beijing Anzhen Hospital,Capital Medical University,Beijing 100029,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2023年第4期32-37,共6页
Journal of Textile Research
基金
北京化工大学有机无机复合材料国家重点实验室开放课题(oic-202201005)。
关键词
熔体静电直写
电场模拟
静电纺丝
聚合物纤维支架
聚己内酯
电场方向
melt electrowriting
electric field simulation
electrospinning
polymer fiber scaffold
polycaprolactone
orientation of electric field
作者简介
第一作者:李好义(1987-),男,副教授,博士。主要研究方向为微纳米纤维先进制备及应用;通信作者:牟文英(1970-),女,助理研究员,博士。主要研究方向为医用材料力学及器械研发。E-mail:happy_mwy@163.com。
