ORCID Profile
0000-0002-6436-8483
Current Organisation
University of Oxford
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Publisher: Springer Science and Business Media LLC
Date: 20-01-2021
Publisher: The Royal Society
Date: 08-02-2014
Abstract: Spherical neodymium–iron–boron magnets are permanent magnets that can be assembled into a variety of structures owing to their high magnetic strength. A one-dimensional chain of these magnets responds to mechanical loadings in a manner reminiscent of an elastic rod. We investigate the macroscopic mechanical properties of assemblies of ferromagnetic spheres by considering chains, rings and chiral cylinders of magnets. Based on energy estimates and simple experiments, we introduce an effective magnetic bending stiffness for a chain of magnets and show that, used in conjunction with classic results for elastic rods, it provides excellent estimates for the buckling and vibration dynamics of magnetic chains. We then use this estimate to understand the dynamic self-assembly of a cylinder from an initially straight chain of magnets.
Publisher: Elsevier BV
Date: 04-2017
Publisher: Springer Science and Business Media LLC
Date: 10-11-2016
DOI: 10.1038/NCOMMS13407
Abstract: Controlling crystal orientations and macroscopic morphology is vital to develop the electronic properties of hybrid perovskites. Here we show that a large-area, orientationally pure crystalline (OPC) methylammonium lead iodide (MAPbI 3 ) hybrid perovskite film can be fabricated using a thermal-gradient-assisted directional crystallization method that relies on the sharp liquid-to-solid transition of MAPbI 3 from ionic liquid solution. We find that the OPC films spontaneously form periodic microarrays that are distinguishable from general polycrystalline perovskite materials in terms of their crystal orientation, film morphology and electronic properties. X-ray diffraction patterns reveal that the film is strongly oriented in the (112) and (200) planes parallel to the substrate. This film is structurally confined by directional crystal growth, inducing intense anisotropy in charge transport. In addition, the low trap-state density (7.9 × 10 13 cm −3 ) leads to strong lified stimulated emission. This ability to control crystal orientation and morphology could be widely adopted in optoelectronic devices.
Publisher: Springer Science and Business Media LLC
Date: 06-07-2015
DOI: 10.1038/NCOMMS8586
Abstract: Single crystals of methylammonium lead trihalide perovskites (MAPbX 3 MA=CH 3 NH 3 + , X=Br − or I − ) have shown remarkably low trap density and charge transport properties however, growth of such high-quality semiconductors is a time-consuming process. Here we present a rapid crystal growth process to obtain MAPbX 3 single crystals, an order of magnitude faster than previous reports. The process is based on our observation of the substantial decrease of MAPbX 3 solubility, in certain solvents, at elevated temperatures. The crystals can be both size- and shape-controlled by manipulating the different crystallization parameters. Despite the rapidity of the method, the grown crystals exhibit transport properties and trap densities comparable to the highest quality MAPbX 3 reported to date. The phenomenon of inverse or retrograde solubility and its correlated inverse temperature crystallization strategy present a major step forward for advancing the field on perovskite crystallization.
Publisher: Society for Industrial & Applied Mathematics (SIAM)
Date: 2013
DOI: 10.1137/120897973
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Alain Goriely.