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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paper:paper_10980121_v79_n10_p_Ancilotto2023-06-08T16:07:42Z Helium on planar and nanostructured alkali-metal surfaces Hernández, Ester Susana 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v79_n10_p_Ancilotto http://hdl.handle.net/20.500.12110/paper_10980121_v79_n10_p_Ancilotto |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
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. |
| author |
Hernández, Ester Susana |
| spellingShingle |
Hernández, Ester Susana Helium on planar and nanostructured alkali-metal surfaces |
| author_facet |
Hernández, Ester Susana |
| author_sort |
Hernández, Ester Susana |
| 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 |
| publishDate |
2009 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v79_n10_p_Ancilotto http://hdl.handle.net/20.500.12110/paper_10980121_v79_n10_p_Ancilotto |
| work_keys_str_mv |
AT hernandezestersusana heliumonplanarandnanostructuredalkalimetalsurfaces |
| _version_ |
1768542232823988224 |