The Isotropic-Nematic Interface in Suspensions of Na-Fluorohectorite Synthetic Clay
| Autor: | Yves Méheust, M. Engelsberg, Kenneth D. Knudsen, Nils I. Ringdal, Henrik Hemmen, Jon Otto Fossum, Eduardo N. de Azevedo, Elisabeth Lindbo Hansen |
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| Přispěvatelé: | Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Birefringence
Condensed matter physics Small-angle X-ray scattering Scattering business.industry Chemistry Isotropy [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Suspension (chemistry) Magnetic field Colloid Optics Liquid crystal Electrochemistry General Materials Science 0210 nano-technology business Spectroscopy |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2009, 25 (21), pp.12507-12515. ⟨10.1021/la901784k⟩ Langmuir, 2009, 25 (21), pp.12507-12515. ⟨10.1021/la901784k⟩ |
| ISSN: | 0743-7463 1520-5827 |
| DOI: | 10.1021/la901784k⟩ |
| Popis: | International audience; Colloidal suspensions of Na-fluorohectorite synthetic clay platelets in saline water exhibit coexisting isotropic andnematic phases, due to gravitational separation of the polydisperse particles. Westudy the ordering of the platelets at the interfaces between various coexisting phases. Four different experimental techniques are employed: visual observation of birefringence, synchrotron wide angle and small-angle X-ray scattering, and magnetic resonance imaging. We find that at the narrow isotropic sol-nematic sol interface the platelets are lying horizontally, i.e. with their mean platelet normal along the vertical direction. The experiments indicate that the platelets align homeotropically both at the isotropic sol-nematic sol interface and at the nematic sol-wall interface. We further investigate the complex alignment effect of a horizontally applied magnetic field in the nematic sol, and we compare it with the adjacent nematic gel. |
| Databáze: | OpenAIRE |
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