Supramolecular Self-Assembly of Macroscopic Tubes

Yan, Deyue; Zhou, Yongfeng; Hou, Jian

doi:10.1126/science.1090763

Cited by 442 publications

(339 citation statements)

References 15 publications

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“…To date, only millimeter-and centimeter-length self-assemblies, such as fibers and microtubes composed of amphiphilic molecules, have been reported. 54,55,59,60 The long helical assembly described here is unique in terms of its hierarchical helical structure and growth dynamics.…”

Section: Discussionmentioning

confidence: 99%

Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

et al. 2015

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The nonequilibrium organization of self-assemblies from small building-block molecules offers an attractive and essential means to develop advanced functional materials and to understand the intrinsic nature of life systems. Fatty acids are well-known amphiphiles that form self-assemblies of several shapes. Here, we found that the lengths of helical structures of oleic acid formed in a buffered aqueous solution are dramatically different by the presence or absence of certain amphiphilic carboxylic acids. For example, under the coexistence of a small amount of N-decanoyl-L-alanine, we observed the formation of over 1-centimeter-long helical assemblies of oleate with a regular pitch and radius, whereas mainly less than 100 µm-long helices formed without this additive.Such long helical assemblies are unique in terms of their highly dimensional helical structure and growth dynamics. Results from the real-time observation of self-assembly formation, site-selective small-angle X-ray scattering, high-performance liquid chromatography analysis, and pH titration experiments suggested that the coexisting carboxylates assist in elongation by supplying oleate molecules to a scaffold for oleate helical assembly.

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Section: Discussionmentioning

confidence: 99%

Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

et al. 2015

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“…They offer superior features such as low viscosity, good solubility and a high range of functionality. Moreover, their much simpler and more cost-effective synthesis mechanism 1,2 have allowed HB polymers to be considered as alternatives to dendrimers for emerging applications in a variety of fields, ranging from nano-building blocks, microelectronics and sensors to applications in drug delivery [3][4][5] . To date, polycondensation of AB n -type monomers still predominate in synthetic approaches to HB polymers 6,7 , but this approach suffers from poor control over the polymer structure.…”

mentioning

confidence: 99%

Controlled multi-vinyl monomer homopolymerization through vinyl oligomer combination as a universal approach to hyperbranched architectures

et al. 2013

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The three-dimensional structures of hyperbranched materials have made them attractive in many important applications. However, the preparation of hyperbranched materials remains challenging. The hyperbranched materials from addition polymerization have gained attention, but are still confined to only a low level of branching and often low yield. Moreover, the complication of synthesis only allows a few specialized monomers and inimers to be used. Here we report a 'Vinyl Oligomer Combination' strategy; a versatile approach that overcomes these difficulties and allows facile synthesis of highly branched polymeric materials from readily available multi-vinyl monomers, which have long been considered as formidable starting materials in addition polymerization. We report the alteration of the growth manner of polymerization by controlling the kinetic chain length, together with the manipulation of chain growth conditions, to achieve veritable hyperbranched materials, which possess nearly 70% branch ratios as well as numerous vinyl functional groups.

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“…155 Especially, PEHOs with PEG arms show unique self-assembly behavior up to the formation of macroscopic visible fibers in acetone (see section ''Solution Properties''). 107,108,178 In ongoing studies, it was found that the DB of PEHO has a significant effect on the aggregation behavior, as the MSPs can self-assemble into vesicles, wormlike micelles, and spherical micelles with a decrease in DB of the hyperbranched core, respectively. 109 Yan and coworkers also synthesized other PEHO-based MSPs, for example, with cationic amino-functional arms, that were the first reported example of self-assembled hyperbranched polymers.…”

Section: Multiarm Star Copolymers With a Hyperbranched Corementioning

confidence: 99%

“…Yan et al 107 synthesized PEHO-star-PEO copolymers with hydrophobic PEHO core and hydrophilic PEO arms. In acetone, these copolymers assemble to macroscopic multiwalled tubes with centimeters in length (Fig.…”

Section: Solution Propertiesmentioning

confidence: 99%

“…32,107,157 Depending on the chemical structure of the arms, polarity, solubility, flexibility, and functionality of the hyperbranched core can be modified. By using well-controlled polymerization techniques, such as anionic and catalytic ring-opening (ROP), or controlled radical polymerizations such as ATRP or RAFT for the preparation of the arms, defined macromolecular architectures can be achieved.…”

Section: Multiarm Star Copolymers With a Hyperbranched Corementioning

confidence: 99%

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Hyperbranched aliphatic polyether polyols

Schömer

Schüll

Frey

2012

J. Polym. Sci. A Polym. Chem.

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Hyperbranched polymers, dendritic macromolecules with branch-on-branch structures, have become an important polymer class since the early 1990s. They combine several advantages of the perfectly branched dendrimers with easy accessibility, typically in a one-step synthesis. Hyperbranched polyethers are a particularly interesting class of chemically stable and often biocompatible materials. Multifunctional hyperbranched polyethers with controllable molar mass and comparably low polydispersities can been prepared using hydroxyl-functional epoxides or oxetanes for polymerization via anionic and cationic polymerization mechanisms. Here, we review the progress in the preparation, characterization, and application of these uniquely versatile aliphatic polyether polyols. Their unusual mechanical, thermal, and solution properties render them useful for a variety of applications, for example, as building blocks for various complex macromolecular architectures or in biomedical applications.

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Supramolecular Self-Assembly of Macroscopic Tubes

Cited by 442 publications

References 15 publications

Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

Structure and growth behavior of centimeter-sized helical oleate assemblies formed with assistance of medium-length carboxylic acids

Controlled multi-vinyl monomer homopolymerization through vinyl oligomer combination as a universal approach to hyperbranched architectures

Hyperbranched aliphatic polyether polyols

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