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Pengfei Xu Dr. Liang Gao Prof. Dr. Chunhua Cai Prof. Dr. Jiaping Lin Dr. Liquan Wang Prof. Dr. Xiaohui Tian 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(34):14387-14391
Toroids and helices are fundamental geometrical structures in nature. Polymers can self-assemble into various nanostructures, including both toroids and helices; however, nanostructures combining toroidal and helical morphologies (that is, helical toroids) are rarely observed. A binary system is reported containing polypeptide homopolymer and its block copolymer, which can hierarchically self-assemble into uniform helical nanotoroids in solution. The formation of the helical toroids is a successive two-step process. First, the homopolymers aggregate into fibrils and convolve into toroids, thereby resembling the toroidal condensation of deoxyribonucleic acid (DNA) chains. Second, the block copolymers self-assemble on the homopolymer toroids and result in helical surface patterns. Additionally, the chirality of the surface helical patterns can be varied by the chirality of the polypeptide block copolymers. 相似文献
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Haiying Huang Dr. Bonghoon Chung Dr. Jueun Jung Hae‐Woong Park Dr. Taihyun Chang Prof. 《Angewandte Chemie (International ed. in English)》2009,48(25):4451-4451
Pure toroidal micelles of highly uniform shape and size are presented by T. Chang et al. in their Communication on page 4594 ff. The donut‐shaped micelles are prepared by spontaneous self‐assembly of a polyisoprene‐block‐poly(2‐vinylpyridine) copolymer, and are stable enough to act as a template for the growth of gold nanoparticles along the ring surface.
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利用原子力显微镜技术(AFM),系统地研究了由乙醇与多价离子(hexammine cobalt(Ⅲ)[Co(NH3)36+])协同作用导致的λ-DNA凝聚现象.单独测得3价Co(NH3)36+的临界凝聚浓度大约是10μmol·L-1,乙醇的临界凝聚体积分数大约是15%.若3价离子[Co(NH3)36+]的浓度大于400μmol·L-1时,可以观察到DNA的解凝聚现象.在DNA溶液中同时加入乙醇(体积分数12%)与Co(NH3)36+(8μmol.L-1),当其浓度各低于其临界值,也可观察到凝聚现象,说明乙醇与Co(NH3)36+对DNA的凝聚有协同作用,而且在协同作用下,可以观察到典型的圆环结构(toroids).利用电荷逆转与离子释放机制分析了观察到的解凝聚现象. 相似文献
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Fátima García Gustavo Fernández Dr. Luis Sánchez Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(27):6740-6747
Molecular construction : Concentration and/or solvent polarity changes modify the subtle balance of the attractive non‐covalent forces involved in the self‐assembly of a rectangular amphiphile. These changes allow the construction of supramolecular architectures ranging from hollow vesicles of different sizes to toroids and wire‐like micelles (see figure).
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