Continuous Condensation in Nanogrooves.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F18%3A00497922" target="_blank" >RIV/67985858:_____/18:00497922 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevE.97.052804" target="_blank" >http://dx.doi.org/10.1103/PhysRevE.97.052804</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevE.97.052804" target="_blank" >10.1103/PhysRevE.97.052804</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Continuous Condensation in Nanogrooves.

Popis výsledku v původním jazyce

We consider condensation in a capillary groove of width L and depth D, formed by walls that are completely wet (contact angle theta=0), which is in a contact with a gas reservoir of the chemical potential mu. On a mesoscopic level, the condensation process can be described in terms of the midpoint height l of a meniscus formed at the liquid-gas interface. For macroscopically deep grooves (D -> 8), and in the presence of long-range (dispersion) forces, the condensation corresponds to a second-order phase transition, such that l similar to (mu(cc)-mu)(-1/4) as mu ->mu(-)(cc) where mu(cc) is the chemical potential pertinent to capillary condensation in a slit pore of width L. For finite values of D, the transition becomes rounded and the groove becomes filled with liquid at a chemical potential higher than mu(cc) with a difference of the order of D-3. For sufficiently deep grooves, the meniscus growth initially follows the power law l similar to (mu(cc-mu)cc)(-1/4) , but this behavior eventually crosses over to l similar to D-(mu-mu(cc))-1/3 above mu cc, with a gap between the two regimes shown to be (delta) over bar mu similar to D-3. Right at mu=mu(cc), when the groove is only partially filled with liquid, the height of the meniscus scales as l* similar to ((DL)-L-3)(1/4). Moreover, the chemical potential (or pressure) at which the groove is half-filled with liquid exhibits a nonmonotonic dependence on D with a maximum at D approximate to 3L/2 and coincides with mu(cc) when L approximate to D. Finally, we show that condensation in finite grooves can be mapped on the condensation in capillary slits formed by two asymmetric (competing) walls a distance D apart with potential strengths depending on L. All these predictions, based on mesoscopic arguments, are confirmed by fully microscopic Rosenfeld's density functional theory with a reasonable agreement down to surprisingly small values of both L and D.

Název v anglickém jazyce

Continuous Condensation in Nanogrooves.

Popis výsledku anglicky

We consider condensation in a capillary groove of width L and depth D, formed by walls that are completely wet (contact angle theta=0), which is in a contact with a gas reservoir of the chemical potential mu. On a mesoscopic level, the condensation process can be described in terms of the midpoint height l of a meniscus formed at the liquid-gas interface. For macroscopically deep grooves (D -> 8), and in the presence of long-range (dispersion) forces, the condensation corresponds to a second-order phase transition, such that l similar to (mu(cc)-mu)(-1/4) as mu ->mu(-)(cc) where mu(cc) is the chemical potential pertinent to capillary condensation in a slit pore of width L. For finite values of D, the transition becomes rounded and the groove becomes filled with liquid at a chemical potential higher than mu(cc) with a difference of the order of D-3. For sufficiently deep grooves, the meniscus growth initially follows the power law l similar to (mu(cc-mu)cc)(-1/4) , but this behavior eventually crosses over to l similar to D-(mu-mu(cc))-1/3 above mu cc, with a gap between the two regimes shown to be (delta) over bar mu similar to D-3. Right at mu=mu(cc), when the groove is only partially filled with liquid, the height of the meniscus scales as l* similar to ((DL)-L-3)(1/4). Moreover, the chemical potential (or pressure) at which the groove is half-filled with liquid exhibits a nonmonotonic dependence on D with a maximum at D approximate to 3L/2 and coincides with mu(cc) when L approximate to D. Finally, we show that condensation in finite grooves can be mapped on the condensation in capillary slits formed by two asymmetric (competing) walls a distance D apart with potential strengths depending on L. All these predictions, based on mesoscopic arguments, are confirmed by fully microscopic Rosenfeld's density functional theory with a reasonable agreement down to surprisingly small values of both L and D.

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

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

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

97

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000433068100006

EID výsledku v databázi Scopus

2-s2.0-85047778626