共查询到20条相似文献,搜索用时 31 毫秒
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Vladimir Kirejev Baharan Ali Doosti Mehrnaz Shaali Gavin D. M. Jeffries Tatsiana Lobovkina 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(21)
Membrane tubular structures are important communication pathways between cells and cellular compartments. Studying these structures in their native environment is challenging, due to the complexity of membranes and varying chemical conditions within and outside of the cells. This work demonstrates that a calcium ion gradient, applied to a synthetic lipid nanotube, triggers lipid flow directed toward the application site, resulting in the formation of a bulge aggregate. This bulge can be translated in a contactless manner by moving a calcium ion source along the lipid nanotube. Furthermore, entrapment of polystyrene nanobeads within the bulge does not tamper the bulge movement and allows transporting of the nanoparticle cargo along the lipid nanotube. In addition to the synthetic lipid nanotubes, the response of cell plasma membrane tethers to local calcium ion stimulation is investigated. The directed membrane transport in these tethers is observed, but with slower kinetics in comparison to the synthetic lipid nanotubes. The findings of this work demonstrate a novel and contactless mode of transport in lipid nanotubes, guided by local exposure to calcium ions. The observed lipid nanotube behavior can advance the current understanding of the cell membrane tubular structures, which are constantly reshaped during dynamic cellular processes. 相似文献
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Nanotubes 总被引:1,自引:0,他引:1
Jerzy Bernholc Christopher Roland Boris I Yakobson 《Current Opinion in Solid State & Materials Science》1997,2(6):706-715
The field of nanotubes is undergoing an explosive growth, fueled by brakethroughs in synthesis and the promise of unique applications. Highly unusual properties and devices have been predicted and/or observed, including extremely high strength and flexibility, nanoscale electronic devices consisting entirely of carbon, and strong capillary effects leading to the production of exceptionally thin wires, cold cathode field emission and other effects. 相似文献
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M. Remkar 《Advanced materials (Deerfield Beach, Fla.)》2004,16(17):1497-1504
Since the first report on the synthesis of inorganic WS2 nanotubes in 1992, the number of articles on the successful growth of different inorganic nanotubes has increased rapidly, emphasizing the importance of this field for nanotechnology. Although there are some geometrical similarities to carbon nanotubes, inorganic nanotubes are distinguished by important peculiarities, from their growth mechanisms to the physical and chemical properties that are attractive for potential applications. Their structural properties, which are important for such applications, are discussed in this review. 相似文献
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D. Golberg Y. Bando C. C. Tang C. Y. Zhi 《Advanced materials (Deerfield Beach, Fla.)》2007,19(18):2413-2432
The current status of research on boron nitride nanotubes (BNNTs)—carbon nanotube structural analogues—is discussed. Latest achievements in BNNT synthesis, morphology, and atomic structure analysis as well as physical, chemical, and functional property evaluations are reviewed. Similarities and differences between structural parameters and properties of BNNTs in comparison with conventional carbon nanotubes are particularly highlighted. Recent breakthroughs in BNNT filling, doping and functionalization, morphology, and electronic structure engineering are examined. Finally, prospective BNNT applications for fabricating field‐effect transistors, gas accumulators, and reinforcing polymer films are presented. 相似文献
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钴/碳纳米管催化剂CVD法制备碳纳米管 总被引:2,自引:0,他引:2
以乙烯为碳源、多壁碳纳米管为载体负载钴作为催化剂,利用CVD法制备出了高质量的多壁碳纳米管.利用扫描电子显微镜(SEM)对催化剂的形貌进行了表征,利用透射电子显微镜(TEM)、X射线衍射仪(XRD)以及差热-热重(TG-DTA)方法对产物进行了表征.发现在最佳裂解温度770℃下制备的多壁碳纳米管直径分布均匀、曲率小、纯净、产率高,更重要的是不具有难处理的氧化物(如Al2O3)载体,充分体现了碳纳米管作为载体的优越性. 相似文献
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A. V. Okotrub N. Maksimova T. A. Duda A. G. Kudashov Yu. V. Shubin D. S. Su E. M. Pazhetnov A. I. Boronin L. G. Bulusheva 《Fullerenes, Nanotubes and Carbon Nanostructures》2005,12(1):99-104
Multiwall CNx nanotubes have been prepared by thermal decomposition of acetonitrile over Co/Ni catalytic particles. The fluorination of nanotubes was performed at room temperature by using a gaseous mixture of BrF3 and Br2. Transmission electron microscopy (TEM) and x-ray diffraction (XRD) indicated that only the outer shells of CNx nanotubes were fluorinated, whereas the inner shells remained intact. X-ray photoelectron spectroscopy (XPS) showed an oxidation of pyridinic-type nitrogen with tube fluorination. 相似文献
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C. N. R. Rao Achutharao Govindaraj 《Advanced materials (Deerfield Beach, Fla.)》2009,21(42):4208-4233
Nanotubes constitute an exciting class of one‐dimensional nanomaterials of which carbon nanotubes are recognized widely as materials of importance. The possibility of having inorganic nanotubes was recognized early in the 1990s, accompanied by the report of nanotubes of MoS2 and WS2. Since then, nanotubes of several inorganic materials have been prepared and characterized. While nanotubes of metal chalcogenides and oxides form a high proportion of the inorganic nanotubes investigated hither to, nanotubes of many other materials have also been prepared and characterized. Several synthetic strategies including both physical and chemical methods have been employed, of which the use of templates, precursors, and hydro‐ or solvothermal methods are prominent. In this article, we shall present a brief account of the present status of the synthesis of nanotubes of elemental materials as well as binary and complex metal oxides, chalcogenides, pnictides and carbides. 相似文献
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