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  • 1
    Publication Date: 2016-05-07
    Description: The preparation of colloidally stable, self-assembled materials with tailorable solid or hollow two-dimensional (2D) structures represents a major challenge. We describe the formation of uniform, monodisperse rectangular platelet micelles of controlled size by means of seeded-growth methods that involve the addition of blends of crystalline-coil block copolymers and the corresponding crystalline homopolymer to cylindrical micelle seeds. Sequential addition of different blends yields solid platelet block comicelles with concentric rectangular patches with distinct coronal chemistries. These complex nano-objects can be subject to spatially selective processing that allows their disassembly to form perforated platelets, such as well-defined hollow rectangular rings. The solid and hollow 2D micelles provide a tunable platform for further functionalization and potential for a variety of applications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, Huibin -- Gao, Yang -- Boott, Charlotte E -- Gould, Oliver E C -- Harniman, Robert L -- Miles, Mervyn J -- Webb, Stephen E D -- Winnik, Mitchell A -- Manners, Ian -- Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2016 May 6;352(6286):697-701. doi: 10.1126/science.aad9521.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Chemistry, University of Bristol, Bristol BS8 1TS, UK. ; School of Physics, University of Bristol, Bristol BS8 1TL, UK. ; Central Laser Facility, Science and Technology Facilities Council, Research Complex at Harwell, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK. ; Department of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, Canada. ; School of Chemistry, University of Bristol, Bristol BS8 1TS, UK. ian.manners@bristol.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27151866" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2018-05-25
    Description: Easily processed materials with the ability to transport excitons over length scales of more than 100 nanometers are highly desirable for a range of light-harvesting and optoelectronic devices. We describe the preparation of organic semiconducting nanofibers comprising a crystalline poly(di- n -hexylfluorene) core and a solvated, segmented corona consisting of polyethylene glycol in the center and polythiophene at the ends. These nanofibers exhibit exciton transfer from the core to the lower-energy polythiophene coronas in the end blocks, which occurs in the direction of the interchain - stacking with very long diffusion lengths (〉200 nanometers) and a large diffusion coefficient (0.5 square centimeters per second). This is made possible by the uniform exciton energetic landscape created by the well-ordered, crystalline nanofiber core.
    Keywords: Materials Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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