分子动力学模拟玻璃微球充气保气性能的机理

为了探讨载能重粒子辐照改善惯性约束聚变中所用玻璃微球的充气性能，以及热弛豫过程中改善其保气性能的微观机制，利用分子动力学的方法对载能重粒子辐照前后的SiO₂玻璃在内部形成气体扩散微通道的机理进行了模拟研究。结果表明，重粒子辐照可以在SiO₂玻璃中形成明显的扩散通道，说明辐照后的玻璃更适合通入Ar等较大尺寸气体；在高温高压的条件下，形成的扩散通道有逐渐关闭的趋势，辐照产生的缺陷能够在一定程度上得到修复。因此，利用重粒子辐照的方法，可在玻璃体中产生充气的微通道，该通道在高温高压下可实现关闭，从而起到开关的作用。模拟结果可为实验上通过重粒子辐照提升微球玻璃充气保气性能的方法提供理论支持，说明该方法具有可行性。

Molecular dynamics simulation of mechanism of gas filling and barrier properties of hollow glass microspheres

In order to investigate the irradiation effects of heavy particles on hollow glass microspheres (HGMs) used in inertial confinement fusion (ICF) and the mechanism during filling gas, the molecular dynamics method was used to simulate the formation of micro-channels before and after irradiation in silica glass. The simulation results show the irradiation of heavy particles have produced obvious channels in silica glasses, which will be better for filling argon gas; the particle channels produced by irradiation have gradually closed under high temperature and high pressure, and the irradiation defects have recovered in some degree. Therefore, the irradiation of heavy particles can produce micro-channels for filling gas, and they can be closed under high temperature and high pressure, which plays the role of a switch. The results provide theoretical support for the experiment of gas filling and barrier properties of microspheres, and also testify the feasibility of the method.