https://scholars.lib.ntu.edu.tw/handle/123456789/631413
標題: | Atypical vesicles and membranes with monolayer and multilayer structures formed by graft copolymers with diblock side-chains: nonlamellar structures and curvature-enhanced permeability | 作者: | Tseng, Yueh Chi Chang, Hsin Yu YU-JANE SHENG Tsao, Heng Kwong |
關鍵字: | ABA TRIBLOCK COPOLYMERS; BACKBONE; DYNAMICS | 公開日期: | 14-九月-2022 | 出版社: | ROYAL SOC CHEMISTRY | 卷: | 18 | 期: | 39 | 起(迄)頁: | 7559 | 來源出版物: | Soft Matter | 摘要: | Graft copolymers with diblock side-chains Am(-graft-B3Ay)n in a selective solvent have been reported to self-assemble into vesicles, but the structure is expected to differ distinctly from those of lipid bilayers. Surprisingly, the number of alternating hydrophobic A-block and hydrophilic B-block layers in the vesicle can vary from a monolayer to multilayers such as the hepta-layer, subject to the same copolymer concentration. The area density of the copolymer layer is not uniform across the membrane. This structural difference among different layers is attributed to the neighboring environment and the curvature of the layer. Because of the unusual polymer conformations, nonlamellar structures of polymersomes are formed, and they are much more intricate than those of liposomes. In fact, a copolymer can contribute to a single or two hydrophilic layers, and it can provide up to three hydrophobic layers. The influence of the backbone length (m) and side-chain length (y) and the permeation dynamics are also studied. The thickness of hydrophobic layers is found to increase with increasing side-chain length but is not sensitive to the backbone length. Although the permeation time increases with the layer number for planar membranes, the opposite behavior is observed for spherical vesicles owing to the curvature-enhanced permeability associated with Laplace pressure. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631413 | ISSN: | 1744683X | DOI: | 10.1039/d2sm01055k |
顯示於: | 化學工程學系 |
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