Capillary Force on a Nanoscale Tip in Dip-Pen Nanolithography

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Monte Carlo simulation has been used to characterize the capillary force due to the condensation of a liquid meniscus between a tip with a nanoscale asperity and a flat surface. To consider both hydrophobic and hydrophilic molecules coating the tip as a model of dip-pen nanolithography, tips with various wettabilities are studied. The capillary force due to the meniscus is calculated for various saturations (humidities). We have implemented a thermodynamic integration technique that can project the force into energetic and entropic contributions. In most cases, the force is mainly energetic in origin. At the snap-off separation where the meniscus disappears, the tip feels a significant entropic force at high saturation. Our calculation shows nonmonotonic behavior of the pull-off force as a function of saturation, which is in qualitative accord with experiments.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number15
DOIs
Publication statusPublished - Jan 1 2003

Fingerprint

pens
menisci
saturation
wettability
humidity
flat surfaces
condensation
coatings
thermodynamics
liquids
molecules
simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Capillary Force on a Nanoscale Tip in Dip-Pen Nanolithography. / Jang, Joonkyung; Schatz, George C; Ratner, Mark A.

In: Physical Review Letters, Vol. 90, No. 15, 01.01.2003.

Research output: Contribution to journalArticle

@article{f30334f8a0f04d138025cb6340a06811,
title = "Capillary Force on a Nanoscale Tip in Dip-Pen Nanolithography",
abstract = "Monte Carlo simulation has been used to characterize the capillary force due to the condensation of a liquid meniscus between a tip with a nanoscale asperity and a flat surface. To consider both hydrophobic and hydrophilic molecules coating the tip as a model of dip-pen nanolithography, tips with various wettabilities are studied. The capillary force due to the meniscus is calculated for various saturations (humidities). We have implemented a thermodynamic integration technique that can project the force into energetic and entropic contributions. In most cases, the force is mainly energetic in origin. At the snap-off separation where the meniscus disappears, the tip feels a significant entropic force at high saturation. Our calculation shows nonmonotonic behavior of the pull-off force as a function of saturation, which is in qualitative accord with experiments.",
author = "Joonkyung Jang and Schatz, {George C} and Ratner, {Mark A}",
year = "2003",
month = "1",
day = "1",
doi = "10.1103/PhysRevLett.90.156104",
language = "English",
volume = "90",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",

}

TY - JOUR

T1 - Capillary Force on a Nanoscale Tip in Dip-Pen Nanolithography

AU - Jang, Joonkyung

AU - Schatz, George C

AU - Ratner, Mark A

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Monte Carlo simulation has been used to characterize the capillary force due to the condensation of a liquid meniscus between a tip with a nanoscale asperity and a flat surface. To consider both hydrophobic and hydrophilic molecules coating the tip as a model of dip-pen nanolithography, tips with various wettabilities are studied. The capillary force due to the meniscus is calculated for various saturations (humidities). We have implemented a thermodynamic integration technique that can project the force into energetic and entropic contributions. In most cases, the force is mainly energetic in origin. At the snap-off separation where the meniscus disappears, the tip feels a significant entropic force at high saturation. Our calculation shows nonmonotonic behavior of the pull-off force as a function of saturation, which is in qualitative accord with experiments.

AB - Monte Carlo simulation has been used to characterize the capillary force due to the condensation of a liquid meniscus between a tip with a nanoscale asperity and a flat surface. To consider both hydrophobic and hydrophilic molecules coating the tip as a model of dip-pen nanolithography, tips with various wettabilities are studied. The capillary force due to the meniscus is calculated for various saturations (humidities). We have implemented a thermodynamic integration technique that can project the force into energetic and entropic contributions. In most cases, the force is mainly energetic in origin. At the snap-off separation where the meniscus disappears, the tip feels a significant entropic force at high saturation. Our calculation shows nonmonotonic behavior of the pull-off force as a function of saturation, which is in qualitative accord with experiments.

UR - http://www.scopus.com/inward/record.url?scp=85038312600&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85038312600&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.90.156104

DO - 10.1103/PhysRevLett.90.156104

M3 - Article

VL - 90

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 15

ER -