共查询到20条相似文献，搜索用时 15 毫秒
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Hugh P. Ryan Cally J. E. Haynes Alyssa Smith Angela B. Grommet Jonathan R. Nitschke 《Advanced materials (Deerfield Beach, Fla.)》2021,33(1)
Coordination cages encapsulate a wide variety of guests in the solution state. This ability renders them useful for applications such as catalysis and the sequestration of precious materials. A simple and general method for the immobilization of coordination cages on alumina is reported. Cage loadings are quantified via adsorption isotherms and guest displacement assays demonstrate that the adsorbed cages retain the ability to encapsulate and separate guest and non‐guest molecules. Finally, a system of two cages, adsorbed on to different regions of alumina, stabilizes and separates a pair of Diels–Alder reagents. The addition of a single competitive guest results in the controlled release of the reagents, thus triggering their reaction. This method of coordination cage immobilization on solid phases is envisaged to be applicable to the extensive library of reported cages, enabling new applications based upon selective solid‐phase molecular encapsulation. 相似文献
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Rika Iwaura Tomohiko Iizawa Hiroyuki Minamikawa Mayumi Ohnishi‐Kameyama Toshimi Shimizu 《Small (Weinheim an der Bergstrasse, Germany)》2010,6(10):1131-1139
The synthesis of 1,18‐nucleotide‐appended bolaamphiphiles (1 , 2 , 4 , and 6) is reported, in which a 3′‐phosphorylated guanidine, adenosine, thymidine, or cytidine is connected to each end of an octadecamethylene chain. Single‐component self‐assemblies and binary self‐assemblies with the complementary oligonucleotides dC 20 , dT 20 , dA 20 , and dG 20 are studied by atomic force microscopy, powder X‐ray diffraction analysis, temperature‐dependent UV absorption, circular dichroism, and attenuated total‐reflection Fourier‐transform infrared spectroscopy. The single‐component self‐assembly of 1 forms a two‐dimensional sheet, whereas the binary self‐assembly 1 / dC 20 gives helical nanofibers. Non‐helical nanofibers are observed for the single‐component self‐assemblies of 2 and 4 , and helical nanofibers form from the binary self‐assembly 2 / dT 20 . Interestingly, helical nanorod structures are obtained from the binary self‐assembly 4 / dA 20 , and the aligned nanorods form a nematic phase. The single‐component and binary self‐assemblies from 6 give unilamellar vesicles owing to a lack of stacking interaction between the cytosine moieties. 相似文献
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Chi Hu Ji Liu Yuchao Wu Kevin R. West Oren A. Scherman 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(14)
In situ photocontrol over shear‐thickening of condensed colloidal dispersions is of paramount importance in a wide range of applications including process technology and photorheological fluids. Its development and practicability, however, are hampered by the lack of well‐designed photoresponsive systems. Here, a colloidal suspension whose rheological behavior is readily switchable between shear‐thinning and shear‐thickening using an external light stimulus is reported. This smart colloidal solution contains hybrid raspberry‐like colloids prepared by employing cucurbit[8]uril as a supramolecular linker to assemble functional Fe3O4 nanoparticles onto a silica core. The formed raspberry colloids are photoresponsive and can be reversibly disassembled under UV irradiation. 相似文献
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Sensors: Self‐Assembly of an Amphiphilic π‐Conjugated Dyad into Fibers: Ultrafast and Ultrasensitive Humidity Sensor (Adv. Mater. 20/2015) 
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下载免费PDF全文 Marco A. Squillaci Laura Ferlauto Yulian Zagranyarski Silvia Milita Klaus Müllen Paolo Samorì 《Advanced materials (Deerfield Beach, Fla.)》2015,27(20):3220-3220
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Supramolecular self‐assembly shows significant potential to construct responsive materials. By tailoring the structural parameters of organic building blocks, nanosystems can be fabricated, whose performance in catalysis, energy storage and conversion, and biomedicine has been explored. Since small organic building blocks are structurally simple, easily modified, and reproducible, they are frequently employed in supramolecular self‐assembly and materials science. The dynamic and adaptive nature of self‐assembled nanoarchitectures affords an enhanced sensitivity to the changes in environmental conditions, favoring their applications in controllable drug release and bioimaging. Here, recent significant research advancements of small‐organic‐molecule self‐assembled nanoarchitectures toward biomedical applications are highlighted. Functionalized assemblies, mainly including vesicles, nanoparticles, and micelles are categorized according to their topological morphologies and functions. These nanoarchitectures with different topologies possess distinguishing advantages in biological applications, well incarnating the structure–property relationship. By presenting some important discoveries, three domains of these nanoarchitectures in biomedical research are covered, including biosensors, bioimaging, and controlled release/therapy. The strategies regarding how to design and characterize organic assemblies to exhibit biomedical applications are also discussed. Up‐to‐date research developments in the field are provided and research challenges to be overcome in future studies are revealed. 相似文献
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Sun K Shao TN Xie JL Lan M Yuan HK Xiong ZH Wang JZ Liu Y Xue QK 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(13):2078-2082
The supramolecular pinwheel cluster is a unique chiral structure with evident handedness. Previous studies reveal that the chiral pinwheels are composed of chiral or achiral molecules with polar groups, which result in strong intermolecular interactions such as hydrogen-bonding or dipole interactions. Herein, it is shown that the simple linear aromatic molecule, pentacene, can be self-assembled into large chiral pinwheel clusters on the semimetal Bi(111) surface, due to enhanced intermolecular interactions. The pentacene pinwheels reveal two levels of organizational chirality: the chiral hexamers resulting from asymmetric shifting along the long molecular axis, and chiral arrangement of six hexamers with a rotor motif. Furthermore, a new relation between the local point chirality and organizational chirality is identified from the pinwheels: the former is not essential for the latter in 2D pinwheel clusters of the pentacene molecule. 相似文献
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Kumar AM Sivakova S Marchant RE Rowan SJ 《Small (Weinheim an der Bergstrasse, Germany)》2007,3(5):783-787
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Vladimir Stepanenko Frank Würthner 《Small (Weinheim an der Bergstrasse, Germany)》2008,4(12):2158-2161