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基于纳米孔的纳流体器件被认为是第3代DNA测序的基础,通过拉伸方法制备的玻璃基纳米孔具有更高的结构强度和更长的使用寿命.本文首先建立了纳米玻璃管分子动力学模型,然后通过分子动力学方法研究了熔融纳米玻璃管的拉伸特性,为玻璃基纳米孔的制备提供理论依据.模拟结果首次揭示了5 nm尺度纳米玻璃管拉伸过程的应力应变关系;统计了不同应变率下的纳米玻璃管内、外径的变化规律.结果显示:纳米玻璃管内径在弹性变形阶段收缩较快,塑性变形阶段收缩相对较慢,断裂过程中纳米玻璃管停止收缩,其管径不变.基于上述规律可知,在应变率越低的情况下,弹性变形和塑性变形阶段相对越长,越有利于纳米玻璃管的收缩.最后通过一维拉伸进给系统实验对上述模拟规律进行验证.文章对熔融纳米玻璃管拉伸成型影响因素的分析,对实际加工制造过程具有指导意义.
Nanofluid-based nanofluidic devices are believed to be the basis of the third generation of DNA sequencing, glass-based nanopore prepared by stretching method has higher structural strength and longer service life.This paper first established a nano-glass tube molecular dynamics Then the molecular dynamics method was used to study the tensile properties of the molten glass tube and provide a theoretical basis for the preparation of the glass-based nanopore. The simulation results revealed for the first time the stress-strain relationship of the nanoscale glass tube at 5 nm. The results show that the inner diameter of the nanometer glass tube shrinks faster during the elastic deformation phase and shrinks relatively slowly during the plastic deformation phase and the nanometer glass tube stops shrinking during the fracture process, Based on the above law, we can see that the lower the strain rate, the longer the elastic deformation and plastic deformation phase, the more conducive to the shrinkage of nano-glass tube.Finally, Simulation rules to verify.The article analyzes the factors that affect the drawing and forming of molten nano-glass tube, which has guiding significance to the actual processing and manufacturing process .