Micropore Filling and Multilayer Formation in Stöber Spheres upon Water Adsorption
Por favor, use este identificador para citar o enlazar este ítem:
http://hdl.handle.net/10045/109868
Título: | Micropore Filling and Multilayer Formation in Stöber Spheres upon Water Adsorption |
---|---|
Autor/es: | Gallego-Gómez, Francisco | Farrando Pérez, Judit | López, Cefe | Silvestre-Albero, Joaquín |
Grupo/s de investigación o GITE: | Materiales Avanzados |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Microporosity | Multilayer formation | Stöber spheres | Water adsorption |
Área/s de conocimiento: | Química Inorgánica |
Fecha de publicación: | 1-sep-2020 |
Editor: | American Chemical Society |
Cita bibliográfica: | The Journal of Physical Chemistry C. 2020, 124(38): 20922-20930. https://doi.org/10.1021/acs.jpcc.0c05313 |
Resumen: | The presence of porosity critically affects the performance of solid systems. The pore accessibility to adsorbate molecules and the corresponding adsorption/desorption behavior are crucial aspects to understand the properties of porous materials but are difficult to address, principally when dealing with narrow micropores. A prominent example is colloidal silica (Stöber) spheres whose microporosity, inaccessible for some adsorbates, can be readily filled by water molecules to a large extent but exhibiting a complex adsorption behavior with unexpected hystereses. Here, we perform water adsorption isotherms on Stöber spheres at different temperatures using an original analysis of the Dubinin–Radushkevich representation to examine both the accessibility to the microporosity and the formation of water multilayers on the outer sphere surface. The micropore filling (and emptying) is found to be limited by the kinetic energy of the water molecules, causing low-pressure hysteresis. We further discover that the (temperature-dependent) completion of the micropore filling delays the onset of multilayer adsorption, leading to hysteresis at a high relative pressure. The number of adsorbed water layers is determined, and the adsorption-induced swelling of the spheres is discussed. |
Patrocinador/es: | This work was funded by Spanish MINECO projects MAT2014-58731-JIN and MAT2016-80285-p and Spanish MCIU project RTI2018-093921-B-C41. |
URI: | http://hdl.handle.net/10045/109868 |
ISSN: | 1932-7447 (Print) | 1932-7455 (Online) |
DOI: | 10.1021/acs.jpcc.0c05313 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2020 American Chemical Society |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1021/acs.jpcc.0c05313 |
Aparece en las colecciones: | INV - LMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
---|---|---|---|---|
Gallego-Gomez_etal_2020_JPhysChemC_final.pdf | Versión final (acceso restringido) | 1,06 MB | Adobe PDF | Abrir Solicitar una copia |
Gallego-Gomez_etal_2020_JPhysChemC_accepted.pdf | Accepted Manuscript (acceso abierto) | 366,56 kB | Adobe PDF | Abrir Vista previa |
Todos los documentos en RUA están protegidos por derechos de autor. Algunos derechos reservados.