标题： 施加磁场对狭缝孔中向列纳米桥形态的影响 显示英文标题

标题： Effect of applied magnetic fields on the morphology of nematic nanobridges in slit pores

摘要： 在本文中，我们报告了一项分子动力学研究，探讨了磁场对长方形纳米桥形态的影响，这些纳米桥由32000个扁平的Gay-Berne粒子组成，位于有利于垂直锚定的狭缝孔中。在没有磁场的情况下，先前的研究表明，纳米桥的不同构型取决于狭缝孔的宽度$D$和壁面的润湿性。在施加均匀磁场循环的情况下，磁场强度逐步增加直到最大值，然后以相同的速度减少，在这种情况下，如果磁场方向垂直于纳米桥的全局向列方向，可以观察到不同纳米桥构型之间的切换。然而，在某些情况下，磁场应用后初始的桥状构型可以恢复，这表明只有在相同的热力学条件下存在不同的局部稳定纳米桥构型时，才能观察到切换现象。此外，磁场可能会使纳米桥不稳定，导致其分解为附着在单个壁上的孤立纳米液滴。 显示英文摘要

摘要： In this paper we report a molecular dynamics study of the effect of the application of magnetic fields on the morphology of nematic nanobridges of 32000 oblate Gay-Berne particles in slit pores favouring homeotropic anchoring. In absence of magnetic fields, previous studies show that there are different conformations of the nanobridge, depending on the slit pore width $D$ and the wettability of the walls. Under the application of uniform magnetic field cycles, in which the intensity of the field is increased stepwise until a maximum value and then decreased at the same rate, switching between different nanobridge conformations can be observed if the magnetic field is applied in a perpendicular direction to the global nematic director of the nanobridge. However, there are situations in which the initial bridge conformation is recovered after the magnetic field application, indicating that the switching can only be observed if there are different locally stable nanobridge conformations under the same thermodynamic conditions. Moreover, magnetic fields can destabilize the nanobridge, leading to its breakdown into isolated nanodroplets attached to a single wall.