Author, as appears in the article.: Carbó, J.J.; Schreiber, R.E.; Houben, L.; Wolf, S.G.; Leitus, G.; Lang, Z.-L.; Poblet, J.M.; Neumann, R.
Department: Química Física i Inorgànica
URV's Author/s: CARBÓ MARTIN, JORGE JUAN; Schreiber, R.E.; Houben, L.; Wolf, S.G.; Leitus, G.; Lang, Z.-L.; POBLET RIUS, JOSEP MARIA; Neumann, R.
Keywords: Polypropylenes Amorphous Fourier Transform Infrared Spectroscopy
Abstract: How molecules in solution form crystal nuclei, which then grow into large crystals, is a poorly understood phenomenon. The classical mechanism of homogeneous crystal nucleation proceeds via the spontaneous random aggregation of species from liquid or solution. However, a non-classical mechanism suggests the formation of an amorphous dense phase that reorders to form stable crystal nuclei. So far it has remained an experimental challenge to observe the formation of crystal nuclei from five to thirty molecules. Here, using polyoxometallates, we show that the formation of small crystal nuclei is observable by cryogenic transmission electron microscopy. We observe both classical and non-classical nucleation processes, depending on the identity of the cation present. The experiments verify theoretical studies that suggest non-classical nucleation is the lower of the two energy pathways. The arrangement in just a seven-molecule proto-crystal matches the order found by X-ray diffraction of a single bulk crystal, which demonstrates that the same structure was formed in each case.
Research group: Química Quàntica
Thematic Areas: Química Química Chemistry
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1755-4330
Author identifier: ; 0000-0003-3705-8073; 0000-0003-0200-3611; 0000-0002-5337-5063; 0000-0002-6749-6667; n/a; ; n/a
Record's date: 2017-04-21
Last page: 373
Journal volume: 9
Papper version: info:eu-repo/semantics/acceptedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2017
First page: 369
Publication Type: Article Artículo Article
Repositori URV