Geometry-induced Interface Pinning at Completely Wet Walls.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F19%3A00505858" target="_blank" >RIV/67985858:_____/19:00505858 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/19:43919097

Výsledek na webu

<a href="https://arxiv.org/pdf/1904.13114.pdf" target="_blank" >https://arxiv.org/pdf/1904.13114.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevE.99.040801" target="_blank" >10.1103/PhysRevE.99.040801</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geometry-induced Interface Pinning at Completely Wet Walls.

Popis výsledku v původním jazyce

We study complete wetting of solid walls that are patterned by parallel nanogrooves of depth D and width L with a periodicity of 2L. The wall is formed of a material which interacts with the fluid via a long-range potential and exhibits first-order wetting transition at temperature T-w, should the wall be planar. Using a nonlocal density functional theory we show that at a fixed temperature T > T-w the process of complete wetting depends sensitively on two microscopic length scales L-c(+) and L-c(-). If the corrugation parameter L is greater than L-c(+), the process is continuous similar to complete wetting on a planar wall. For L-c(-) < L < L-c(+), the complete wetting exhibits first-order depinning transition corresponding to an abrupt unbinding of the liquid-gas interface from the wall. Finally, for L < L-c(-) the interface remains pinned at the wall even at bulk liquid-gas coexistence. This implies that nanomodification of substrate surfaces can always change their wetting character from hydrophilic into hydrophobic, in direct contrast to the macroscopic Wenzel law. The resulting surface phase diagram reveals a close analogy between the depinning and prewetting transitions including the nature of their critical points.

Název v anglickém jazyce

Geometry-induced Interface Pinning at Completely Wet Walls.

Popis výsledku anglicky

We study complete wetting of solid walls that are patterned by parallel nanogrooves of depth D and width L with a periodicity of 2L. The wall is formed of a material which interacts with the fluid via a long-range potential and exhibits first-order wetting transition at temperature T-w, should the wall be planar. Using a nonlocal density functional theory we show that at a fixed temperature T > T-w the process of complete wetting depends sensitively on two microscopic length scales L-c(+) and L-c(-). If the corrugation parameter L is greater than L-c(+), the process is continuous similar to complete wetting on a planar wall. For L-c(-) < L < L-c(+), the complete wetting exhibits first-order depinning transition corresponding to an abrupt unbinding of the liquid-gas interface from the wall. Finally, for L < L-c(-) the interface remains pinned at the wall even at bulk liquid-gas coexistence. This implies that nanomodification of substrate surfaces can always change their wetting character from hydrophilic into hydrophobic, in direct contrast to the macroscopic Wenzel law. The resulting surface phase diagram reveals a close analogy between the depinning and prewetting transitions including the nature of their critical points.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA17-25100S" target="_blank" >GA17-25100S: Geometricky a chemicky strukturované povrchy: od rovnováhy k dynamice</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review E

ISSN

2470-0045

e-ISSN

—

Svazek periodika

99

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

040801

Kód UT WoS článku

000466433200001

EID výsledku v databázi Scopus

2-s2.0-85065311826