Hoạt động
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Seminar
| Seminar Vật lý lý thuyết và Vật lý tính toán:
| | Tên báo cáo | Soft vesicles with orientational order
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| Người trình bày | Nguyễn Thanh Sơn
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| Cơ quan | Kent State University, USA
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| Ngày | Thứ Ba, 17-09-2013
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| Giờ | 10:00 AM
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| Địa điểm | Phòng họp tầng 1, Viện Vật lý, 10 Đào Tấn, Ba Đình, Hà Nội
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| Tóm tắt | Nematic liquid crystal (NLC) is a special phase of matter in which the molecules have random positions and tend to align parallel to each other. When NLC is confined on a closed vesicle, there must be a total topological charge of +2, which normally occurs as four defects of charge +1/2 each. Previous research has suggested that these four defects will form a regular tetrahedron, leading to a tetrahedral shape of the vesicle, which may be useful in designing colloidal particles for photonic applications. Here, we use three approaches to investigate the behavior of a nematic vesicle: particle-based simulation, spherical harmonic expansion, and nite-element modeling. We found that the perfect tetrahedral shape is only stable when the vesicle is completely rigid; the vesicle is a distorted tetrahedron for a hard membrane and a highly elongated rectangle for a softer membrane.
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