Direct Measurement of the Laplace Pressure in a Very Thin Liquid Film

Zhang, Bo; Nakajima, Akira

doi:10.1006/jcis.2001.7985

Cited by 6 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fingering patterns seen in the unstable experiments, just before complete detachment, have been observed and studied in similar systems [13,[22][23][24][25]. Two examples ( Fig.…”

Section: Experimental Imagesmentioning

confidence: 87%

“…Pr dr, as this leads to a fingering instability [21,13,[22][23][24][25] where the shape of the interface is no longer cylindrical. Therefore, it is useful to also consider the relationship between the fluid volume, gap spacing, and an arbitrary areâ…”

Section: Theorymentioning

confidence: 99%

“…The de-wetting aspects that occur in an unstable configuration of the proposed problem is complicated, because of the sometimes simultaneous presence of a capillary [19,17,20] and a fingering instability [21,13,[22][23][24][25]. The discussion in this paragraph is limited to capillary instabilities since it results in rupture of the liquid bridge and yields detachment while fingering may influence the dynamics of the de-wetting process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Capillary-pressure driven adhesion of rigid-planar surfaces

Ward

2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…The fingering patterns seen in the unstable experiments, just before complete detachment, have been observed and studied in similar systems [13,[22][23][24][25]. Two examples ( Fig.…”

Section: Experimental Imagesmentioning

confidence: 87%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Capillary-pressure driven adhesion of rigid-planar surfaces

Ward

2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…[ 11–14 ] The dilemma is that large surface roughness and tall features are preferred for achieving superhydrophobicity, which in the meantime making surfaces vulnerable to loose superhydrophobicity even under mild hydrostatic pressures: for example, micropillar arrays (diameter of 10 µm and height of 50 µm) and lotus leave can only endure 2 kPa (water depth of 20 cm) and 4 kPa (water depth of 40 cm), respectively. [ 15,16 ] According to the Laplace equation, [ 17 ] the Laplace pressure (or the pressure difference between the inside and outside of a curvature) is given by Δ P = 2γ/ R , where γ is the surface tension of liquid, and R is the radius of the droplet. Thus, it is difficult to repel small droplets (diameter <1 mm, ≈0.5 µL) such as fine rain drops and condensation drops from the surface as they can exert large Laplace pressure on surface, making the superhydrophobic coatings with microscale roughness vulnerable to water drop impregnation.…”

Section: Introductionmentioning

confidence: 99%

Highly Robust, Pressure‐Resistant Superhydrophobic Coatings from Monolayer Assemblies of Chained Nanoparticles

Zhao

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

Despite significant progresses in development of superhydrohpobic coatings, their ability to resist small water droplets, which can exert large Laplace pressure on surface, remain limited. Here, a new strategy by self‐assembly of a monolayer of chained silica nanoparticles, forming an ultrathin film (<100 nm) with two‐tiered nanoasperity is presented. The resulting coating shows ultrahigh water repellency and high visible transparency. It can also repel low surface energy liquids, such as alcohol/water mixtures (surface tension ≥42 mN m−1). Importantly, the superhydrophobic coating demonstrates high resistance to impact pressure (at least 250 Pa) from water droplets dropped from 3.3 m height and internal Laplace pressure of 15 kPa from evaporated water droplets. Furthermore, the CNP coating remains to be superhydrophobic with condensed water droplets radius as small as 0.3 mm even after condensation for 6 h. In comparison, all of these properties are not possible from the assembly of spherical nanoparticles.

show abstract

“…Surface tension of liquids gives rise to what is known as Laplace pressure which generates a meniscus force. The Laplace pressure, p, is given by the following Equation [16,17],…”

Section: Introductionmentioning

confidence: 99%

Surface Energies of Magnetic Recording Head Components

Abenojar

Herber²,

Enriquez

2010

Tribol Lett

View full text Add to dashboard Cite

The rate of material removal during fixed abrasive lapping is a function of friction coefficient, the surface tension of the lubricant and of the substrate, and the contact angles between the interfaces. In this study, the authors measured the surface energies of materials typically found in thin film magnetic recording heads using contact angle measurements and the Lifshitz-van der Waals acid/base approach. The different materials tested were Ni x Fe y , Al 2 O 3 , and Al 2 O 3 -TiC. Sample preparation procedures were also considered. The chemical used to wash the surface was observed to affect the measured substrate surface energies. Surface energy values for samples washed with either acetone or hexane showed comparable results. The Ni x Fe y gave the highest measured surface energy (46.3-48.8 mJ m -2 ) followed by Al 2 O 3 (44.1-45.3 mJ m -2 ) and Al 2 O 3 -TiC (43.3-45.3 mJ m -2 ). In contrast, the oil-washed samples measured generally lower surface energy values. The study characterized the interaction of two lubricant types against the three materials. The oil-based lubricant spreads completely on oilwashed samples mainly because of the low surface tension of the oil (22.0 mJ m -2 ) and did not show measurable contact angles. In comparison, the water-soluble lubricant ethylene glycol, due to its higher surface tension (48.0 mJ m -2 ), formed higher contact angles ranging from 47.2 to 59.6°on the different substrates.

show abstract

Direct Measurement of the Laplace Pressure in a Very Thin Liquid Film

Cited by 6 publications

References 17 publications

Capillary-pressure driven adhesion of rigid-planar surfaces

Capillary-pressure driven adhesion of rigid-planar surfaces

Highly Robust, Pressure‐Resistant Superhydrophobic Coatings from Monolayer Assemblies of Chained Nanoparticles

Surface Energies of Magnetic Recording Head Components

Contact Info

Product

Resources

About