Neutron diffraction study of aqueous Laponite suspensions at the NIMROD diffractometer
| Autor: | Maria Antonietta Ricci, L. Zulian, Fabio Bruni, Barbara Ruzicka, Roberta Angelini, Valentina Tudisca, Alan K. Soper, Ernesto Scoppola |
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| Přispěvatelé: | Valentina, Tudisca, Bruni, Fabio, Ernesto, Scoppola, Roberta, Angelini, B., Ruzicka, L., Zulian, A. K., Soper, Ricci, Maria Antonietta, Tudisca, V, Bruni, F, Scoppola, E, Angelini, R, Ruzicka, B, Zulian, L, Soper, A, Ricci, M |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Models
Molecular Length scale Mesoscopic physics Time Factors Materials science business.industry Scattering Silicates Neutron diffraction Molecular Conformation Water colloid soft matter SANS laponite aging out of equilibrium sistems phase transitions gel glass Small-angle neutron scattering Condensed Matter::Soft Condensed Matter Neutron Diffraction Colloid FIS/01 - FISICA SPERIMENTALE Optics Suspensions Chemical physics Nimrod LAPONITE DISPERSIONS GELS SUSPENSIONS POLYMER STATES CLAY business Monte Carlo Method Diffractometer |
| Zdroj: | Physical review. E, Statistical, nonlinear, and soft matter physics info:cnr-pdr/source/autori:Tudisca, V.; Bruni, F.; Scoppola, E.; Angelini, R.; Ruzicka, B.; Zulian, L.; Soper, A. K.; Ricci, M. A./titolo:Neutron diffraction study of aqueous Laponite suspensions at the NIMROD diffractometer/doi:10.1103%2FPhysRevE.90.032301/rivista:Physical review. E, Statistical, nonlinear, and soft matter physics (Print)/anno:2014/pagina_da:/pagina_a:/intervallo_pagine:/volume:90 |
| DOI: | 10.1103/PhysRevE.90.032301 |
| Popis: | The process of dynamical arrest, leading to formation of different arrested states such as glasses and gels, along with the closely related process of aging, is central for both basic research and technology. Here we report on a study of the time-dependent structural evolution of two aqueous Laponite clay suspensions at different weight concentrations. Neutron diffraction experiments have been performed with the near and intermediate range order diffractometer (NIMROD) that allows studies of the structure of liquids and disordered materials over a continuous length scale ranging from 1 to 300 angstrom, i.e., from the atomistic to the mesoscopic scales. NIMROD is presently a unique diffractometer, bridging the length scales traditionally investigated by small angle neutron scattering or small angle x-ray scattering with that accessible by traditional diffractometers for liquids. Interestingly, we have unveiled a signature of aging of both suspensions in the length scale region of NIMROD. This phenomenon, ascribed to sporadic contacts between Laponite platelets at long times, has been observed with the sample arrested as gel or as repulsive glass. Moreover, water molecules within the layers closest to Laponite platelets surface show orientational and translational order, which maps into the crystalline structure of Laponite. |
| Databáze: | OpenAIRE |
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