Freezing/melting of water in the confined nanospace of carbon materials: Effect of an external stimulus
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Título: | Freezing/melting of water in the confined nanospace of carbon materials: Effect of an external stimulus |
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Autor/es: | Cuadrado-Collados, Carlos | Majid, Ahmad A.A. | Martinez-Escandell, Manuel | Daemen, Luke L. | Missyul, Alexander | Koh, Carolyn | Silvestre-Albero, Joaquín |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Freezing/melting | Water | Confined nanospace | Carbon materials | External stimulus |
Área/s de conocimiento: | Química Inorgánica |
Fecha de publicación: | mar-2020 |
Editor: | Elsevier |
Cita bibliográfica: | Carbon. 2020, 158: 346-355. doi:10.1016/j.carbon.2019.10.081 |
Resumen: | Freezing/melting behavior of water confined in the nanopores of activated carbon materials has been evaluated using differential scanning calorimetry (DSC) at different water loadings, and after the application of an external stimulus. Under atmospheric pressure conditions, the DSC scans show a depression in the freezing/melting point of confined water compared to the bulk system. Interestingly, water confined in narrow micropores (pores below 0.7 nm) does not exhibit any phase transition, i.e. it is non-freezable water. Inelastic neutron scattering (INS) data confirm the presence of a distorted molecular assembly in narrow micropores, whereas synchrotron X-ray powder diffraction data (SXRPD) demonstrate the non-freezable nature of the water confined in these narrow-constrictions. Similar experiments under high-pressure CH4 give rise to a completely different scenario. Under high-pressure conditions methane hydrates are formed with a water-to-hydrate yield of 100% for the under-saturated and saturated samples, i.e. in the presence of an external stimulus even water in narrow micropores is prone to experience a liquid-to-solid phase transition. These results confirm the beneficial role of carbon as a host structure to promote nucleation and growth of methane hydrates with faster kinetics and a higher yield compared to the bulk system and to other porous materials. |
Patrocinador/es: | The authors would like to acknowledge financial support from the MINECO (MAT2016-80285-p), Generalitat Valenciana (PROMETEOII/2014/004), H2020 (MSCA-RISE-2016/NanoMed Project), Spanish ALBA synchrotron (Projects 2018022707 & 2019023322) and Oak Ridge beam time availability (Project IPTS-20843.1). |
URI: | http://hdl.handle.net/10045/103488 |
ISSN: | 0008-6223 (Print) | 1873-3891 (Online) |
DOI: | 10.1016/j.carbon.2019.10.081 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2019 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.carbon.2019.10.081 |
Aparece en las colecciones: | Investigaciones financiadas por la UE INV - LMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2020_Cuadrado-Collados_etal_Carbon_final.pdf | Versión final (acceso restringido) | 1,34 MB | Adobe PDF | Abrir Solicitar una copia |
2020_Cuadrado-Collados_etal_Carbon_accepted.pdf | Accepted Manuscript (acceso abierto) | 1,04 MB | Adobe PDF | Abrir Vista previa |
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