Contact Angle of Cylindrical Droplets Within a Smooth and Homogeneous Cylinder Stretched by Quadratic Parabola

Long Zhou; Guo-Qiang Chen; Guang-Hua Sun; Ai-Jun Hu; Xiao-Song Wang

doi:10.1166/jctn.2017.6532

Contact Angle for Spherical Nanodroplet in Cylindrical Cavity with Quadratic Curve Generatrix

Mechanical Engineering Research ◽

10.5539/mer.v6n1p96 ◽

2016 ◽

Vol 6 (1) ◽

pp. 96

Author(s):

Ai-Jun Hu ◽

Bao-Zhan Lv

Keyword(s):

Contact Angle ◽

Line Tension ◽

Equilibrium Contact Angle ◽

Cylinder Surface ◽

Quadratic Curve ◽

Dividing Surface ◽

Solid Liquid ◽

Young Equation ◽

Homogeneous Cylinder ◽

Young's Equation

<p class="1Body">Wetting of a spherical nanodroplet in smooth and homogeneous cylinder surface rotated by quadratic curve was studied by methods of thermodynamics. The solid-liquid-vapor system was separated into six parts using Gibbs method of dividing surface. The system free energy was calculated. A generalized Young equation for the equilibrium contact angle is proposed taking the line tension effects into consideration. On the basis of some assumptions, this generalized Young equation is the same as the classical Young’s equation.</p>

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Investigation of behavior of the dynamic contact angle in a problem of convective flows

Eurasian Journal of Mathematical and Computer Applications ◽

10.32523/2306-3172-2017-7-4-27-42 ◽

2017 ◽

Vol 5 (4) ◽

pp. 27-42

Author(s):

O.N Goncharova ◽

◽

I.V. Marchuk ◽

A.V. Zakurdaeva ◽

◽

...

Keyword(s):

Contact Angle ◽

Dynamic Contact Angle ◽

Dynamic Contact ◽

Convective Flows

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Controlling porosity and density of nanocellulose aerogels for superhydrophobic light materials

TAPPI Journal ◽

10.32964/tj17.03.145 ◽

2018 ◽

Vol 17 (03) ◽

pp. 145-153 ◽

Cited By ~ 1

Author(s):

Chengua Yu ◽

Feng Wang ◽

Shiyu Fu ◽

Lucian Lucia

Keyword(s):

Contact Angle ◽

Freeze Drying ◽

Engine Oil ◽

High Porosity ◽

Water Mixture ◽

Waste Engine Oil ◽

Hydrophobically Modified ◽

Static Contact ◽

Oil Water ◽

Hydrophobic Material

A very low-density oil-absorbing hydrophobic material was fabricated from cellulose nanofiber aerogels–coated silane substances. Nanocellulose aerogels (NCA) superabsorbents were prepared by freeze drying cellulose nanofibril dispersions at 0.2%, 0.5%, 0.8%, 1.0%, and 1.5% w/w. The NCA were hydrophobically modified with methyltrimethoxysilane. The surface morphology and wettability were characterized by scanning electron microscopy and static contact angle. The aerogels displayed an ultralow density (2.0–16.7 mg·cm-3), high porosity (99.9%–98.9%), and superhydrophobicity as evidenced by the contact angle of ~150° that enabled the aerogels to effectively absorb oil from an oil/water mixture. The absorption capacities of hydrophobic nanocellulose aerogels for waste engine oil and olive oil could be up to 140 g·g-1 and 179.1 g·g-1, respectively.

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High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

MRS Proceedings ◽

10.1557/proc-451-521 ◽

1996 ◽

Vol 451 ◽

Cited By ~ 1

Author(s):

T. Shimizu ◽

M. Murahara

Keyword(s):

Contact Angle ◽

High Resolution ◽

Laser Beam ◽

Thin Layer ◽

Functional Groups ◽

Excimer Laser ◽

Laser Fluence ◽

Large Area ◽

Three Solutions ◽

Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

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Electron Holographic Nano-Characterization of Gold Catalyst at Interface

MRS Proceedings ◽

10.1557/proc-727-r2.2 ◽

2002 ◽

Vol 727 ◽

Cited By ~ 1

Author(s):

S. Ichikawa ◽

T. Akita ◽

M. Okumura ◽

M. Haruta ◽

K. Tanaka

Keyword(s):

Contact Angle ◽

Titanium Oxide ◽

Gold Catalyst ◽

Three Dimensional ◽

High Resolution Electron Microscopy ◽

Electron Holography ◽

Gold Particles ◽

Oxide Support ◽

The Mean ◽

A Charge

AbstractThe catalytic properties of nanostructured gold catalyst are known to depend on the size of the gold particles and to be activated when the size decreases to a few nanometers. We investigated the size dependence of the three-dimensional nanostructure on the mean inner potential of gold catalysts supported on titanium oxide using electron holography and high-resolution electron microscopy (HREM). The contact angle of the gold particles on the titanium oxide tended to be over 90° for gold particles with a size of over 5 nm, and below 90° for a size of below 2 nm. This decreasing change in the contact angle (morphology) acts to increase the perimeter and hence the area of the interface between the gold and titanium oxide support, which is considered to be an active site for CO oxidation. The mean inner potential of the gold particles also changed as their size decreased. The value of the inner potential of gold, which is approximately 25 V in bulk state, rose to over 40 V when the size of the gold particles was less than 2 nm. This phenomenon indicates the existence of a charge transfer at the interface between gold and titanium oxide. The 3-D structure change and the inner potential change should be attributed to the specific electronic structure at the interface, owing to both the “nano size effect” and the “hetero-interface effect.”

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