Nature of Capillary Condensation and Evaporation Processes in Ordered Porous Materials
| Autor: | Annie Grosman, Camille Ortega |
|---|---|
| Přispěvatelé: | Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Capillary action
Evaporation CYLINDRICAL PORES Thermodynamics 02 engineering and technology SURFACE-AREA 010402 general chemistry 01 natural sciences MECHANISMS Electrochemistry General Materials Science NETWORK Porosity TEMPERATURE Spectroscopy Capillary condensation Chemistry ADSORPTION DESORPTION HYSTERESIS POROSITY Surfaces and Interfaces Mesoporous silica 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Condensed Matter::Soft Condensed Matter Hysteresis MESOPOROUS SILICA SIZE [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] SBA-15 MATERIALS 0210 nano-technology Porous medium Mesoporous material |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2005, 21 (23), pp.10515. ⟨10.1021/la051030o⟩ Langmuir, 2005, 21 (23), pp.10515. ⟨10.1021/la051030o⟩ |
| ISSN: | 0743-7463 1520-5827 |
| Popis: | We report on a detailed experimental study of capillary condensation-evaporation processes of N(2) in ordered mesoporous SBA-15 silica. We have carried out measurements of boundary hysteresis loops, reversal curves, and subloops in order to test whether this material behaves as an assembly of independent cylindrical pores open at both ends. With these data, we come to the conclusion that, whereas the boundary hysteresis loop has the classical shape of type H1 associated with condensation-evaporation in cylindrical pores open at both ends, the capillary evaporation does not take place at equilibrium as it is generally assumed. Moreover, the pores do not desorb independently of one another. |
| Databáze: | OpenAIRE |
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