Helium on planar and nanostructured alkali-metal surfaces
We investigate the effects (on the wetting characteristics of helium below 3 K) of tailoring an alkali-metal surface by incorporating a regular array of nanoscopic indentations. We establish the prewetting line of helium on semi-infinite planar Cs up to 3 K in the frame of a finite-range temperature...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10980121_v79_n10_p_Ancilotto |
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todo:paper_10980121_v79_n10_p_Ancilotto2023-10-03T16:06:11Z Helium on planar and nanostructured alkali-metal surfaces Ancilotto, F. Barranco, M. Hernández, E.S. Hernando, A. Pi, M. We investigate the effects (on the wetting characteristics of helium below 3 K) of tailoring an alkali-metal surface by incorporating a regular array of nanoscopic indentations. We establish the prewetting line of helium on semi-infinite planar Cs up to 3 K in the frame of a finite-range temperature-dependent density-functional theory, and examine the modifications introduced in the isotherms when the substrate is covered with a periodic lattice of parabolic cavities. We show that, both for the planar and nanostructured surfaces, the unstable regions of the isotherms are stabilized by nucleation of drops and/or bubbles. Results corresponding to nonwettable Cs surfaces are compared with those obtained both for planar and nanopatterned Na substrates, where wetting at zero temperature is instead expected to occur, for a planar surface, preceded by a first-order prewetting transition. © 2009 The American Physical Society. Fil:Hernández, E.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v79_n10_p_Ancilotto |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We investigate the effects (on the wetting characteristics of helium below 3 K) of tailoring an alkali-metal surface by incorporating a regular array of nanoscopic indentations. We establish the prewetting line of helium on semi-infinite planar Cs up to 3 K in the frame of a finite-range temperature-dependent density-functional theory, and examine the modifications introduced in the isotherms when the substrate is covered with a periodic lattice of parabolic cavities. We show that, both for the planar and nanostructured surfaces, the unstable regions of the isotherms are stabilized by nucleation of drops and/or bubbles. Results corresponding to nonwettable Cs surfaces are compared with those obtained both for planar and nanopatterned Na substrates, where wetting at zero temperature is instead expected to occur, for a planar surface, preceded by a first-order prewetting transition. © 2009 The American Physical Society. |
| format |
JOUR |
| author |
Ancilotto, F. Barranco, M. Hernández, E.S. Hernando, A. Pi, M. |
| spellingShingle |
Ancilotto, F. Barranco, M. Hernández, E.S. Hernando, A. Pi, M. Helium on planar and nanostructured alkali-metal surfaces |
| author_facet |
Ancilotto, F. Barranco, M. Hernández, E.S. Hernando, A. Pi, M. |
| author_sort |
Ancilotto, F. |
| title |
Helium on planar and nanostructured alkali-metal surfaces |
| title_short |
Helium on planar and nanostructured alkali-metal surfaces |
| title_full |
Helium on planar and nanostructured alkali-metal surfaces |
| title_fullStr |
Helium on planar and nanostructured alkali-metal surfaces |
| title_full_unstemmed |
Helium on planar and nanostructured alkali-metal surfaces |
| title_sort |
helium on planar and nanostructured alkali-metal surfaces |
| url |
http://hdl.handle.net/20.500.12110/paper_10980121_v79_n10_p_Ancilotto |
| work_keys_str_mv |
AT ancilottof heliumonplanarandnanostructuredalkalimetalsurfaces AT barrancom heliumonplanarandnanostructuredalkalimetalsurfaces AT hernandezes heliumonplanarandnanostructuredalkalimetalsurfaces AT hernandoa heliumonplanarandnanostructuredalkalimetalsurfaces AT pim heliumonplanarandnanostructuredalkalimetalsurfaces |
| _version_ |
1807321491546570752 |