Specific surface free energies of strontium chlorapatite single crystal determined by contact angles of liquid droplets

2006 ◽  
Vol 421 (4-6) ◽  
pp. 343-347 ◽  
Author(s):  
Takaomi Suzuki ◽  
Ittetsu Kumeda ◽  
Katsuya Teshima ◽  
Shuji Oishi
Keyword(s):  
Specific Surface ◽  
Single Crystal ◽  
Contact Angles ◽  
Liquid Droplets ◽  
Free Energies ◽  
Strontium Chlorapatite

The Properties of Liquid Phase Embryos at the Intersections of Plane Solid Surfaces

1952 ◽  
Vol 5 (4) ◽  
pp. 618
Author(s):  
RG Wylie
Keyword(s):  
Contact Angle ◽  
Solid Surface ◽  
Contact Angles ◽  
Solid Surfaces ◽  
Boundary Line ◽  
Pure Liquid ◽  
Liquid Droplets ◽  
Free Energies ◽  
Different Types ◽  
Kinetics Of

In order to calculate the probabilities of nucleation of liquid droplets at different types of site on a solid surface, the properties of embryonic droplets which may exist in complete thermodynamic equilibrium at those sites must be known. The general properties of liquid embryos formed on a plane solid surface, or at lines or points of intersection of plane solid surfaces, are considered. It is shown that, although an edge free energy associated with the boundary line may substantially affect the properties -of embryos at small contact angles, the effect is probably not large, for embryos of the sizes of interest, when the contact angle is larger than about π/4. The areas, volumes, total surface free energies, and free energies of formation are found for embryos at these sites as functions of the contact angle, any edge free energies being neglected. The extension to the formation of bubbles at plane solid surfaces in a pure liquid is indicated. The results are applied in a following paper to the kinetics of condensation of a vapour at an imperfect crystalline surface.

scholarly journals Experimental Investigation of Coal Dust Wettability Based on Surface Contact Angle

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Gang Zhou ◽  
Han Qiu ◽  
Qi Zhang ◽  
Mao Xu ◽  
Jiayuan Wang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Specific Surface ◽  
Coal Dust ◽  
Single Point ◽  
Contact Angles ◽  
Critical Surface ◽  
Volume Percentage ◽  
Surface Areas ◽  
Specific Surface Areas

Wettability is one of the key chemical properties of coal dust, which is very important to dedusting. In this paper, the theory of liquid wetting solid was presented firstly; then, taking the gas coal of Xinglongzhuang coal mine in China as an example, by determination of critical surface tension of coal piece, it can be concluded that only when the surface tension of surfactant solution is less than 45 mN/m can the coal sample be fully wetted. Due to the effect of particle dispersity, compared with the contact angle of milled coal particle, not all the contact angles of screened coal powder with different sizes have a tendency to increase. Furthermore, by the experiments of coal samples’ specific surface areas and porosities, it can be achieved that the volume of single-point total pore decreases with the gradual decreasing of coal’s porosity, while the ultramicropores’ dispersities and multipoint BET specific surface areas increase. Besides, by a series of contact angle experiments with different surfactants, it can be found that with the increasing of porosity and the decreasing of volume percentage of ultramicropore, the contact angle tends to reduce gradually and the coal dust is much easier to get wetted.

Equilibrium Contact Angles of Liquid Droplets on Ideal Rough Solids

Langmuir ◽  
2011 ◽  
Vol 27 (24) ◽  
pp. 14910-14918 ◽  
Author(s):  
Hie Chan Kang ◽  
Anthony M. Jacobi
Keyword(s):  
Contact Angles ◽  
Liquid Droplets

Self Seeded ZnO Nanowire Growth by Ultrasonic Spray Assisted Chemical Vapour Deposition

2005 ◽  
Vol 879 ◽  
Author(s):  
M. Wei ◽  
D. Zhi ◽  
J. L. MacManus-Driscoll
Keyword(s):  
Single Crystal ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Uv Light ◽  
Chemical Vapour ◽  
Nanowire Growth ◽  
Liquid Droplets ◽  
Zno Nanowire ◽  
Seeded Growth ◽  
Ultrasonic Spray

AbstractZnO, which exhibits a direct bandgap of 3.37 eV at room temperature with a large exciton binding energy of 60 meV,is of considerable technological importance because of its potential use in short-wavelength devices, such as ultraviolet (UV) light-emitting diodes and laser diodes. The fabrication and application of 1-D ZnO nanostructures has attracted considerable interest in recent years. In this work, we produced single crystal nanowires of zinc oxide using a novel self-seeded growth using ultrasonic spray assisted chemical vapour deposition, in which a nanocrystalline seed layer was first deposited onto a glass substrate and the nanowires subsequently grown using a different precursor concentration and substrate temperature. The diameter of the nanowires is in the range of 20-80 nm and the length of the wires is as long as 10 μm. The single crystal nature of the nanowires was revealed by high resolution transmission electron microscopy. The formation of liquid droplets due to the reducing atmosphere and the higher temperature during the nanowire growth was found to be the key step of the ZnO nanowire formation.

Temperature-Dependent Wettability of Water on a Nickel Surface at Pressurized Condition: A Molecular Dynamics Study

2019 ◽  
Author(s):  
Dong-Lei Zeng ◽  
Biao Feng ◽  
Jia-Wen Song ◽  
Li-Wu Fan
Keyword(s):  
Contact Angle ◽  
Hydrogen Bonds ◽  
Average Energy ◽  
Contact Angles ◽  
Nickel Surface ◽  
Free Energies ◽  
Water Droplets ◽  
Temperature Dependent ◽  
Interfacial Free Energies ◽  
Solid Liquid

Abstract Temperature-dependent wettability of water droplets on a metal surface in a pressurized environment is of great theoretical and practical significance. In this paper, molecular dynamic simulation is used to study this problem by relating the temperature-dependent apparent contact angles to the changes in solid-liquid and solid-vapor interfacial free energies and hydrogen bonds in the nano-sized water droplets with increasing the temperature. The temperature range of interest is set from 298 K to 538 K in a 20 K interval under a constant pressure of 7 MPa. The results show that the contact angle in general decreases with raising the temperature and decreasing trend can be divided into two sections with different slopes. The contact angle drops slowly when the temperature is below 458 K as a critical point. Beyond this point, the contact angle shows a much steeper decrease. The difference between solid-vapor and solid-liquid interfacial free energies is found to decrease slightly with temperature. Combining with that the surface tension drops with increasing the temperature, a decreasing trend of the contact angle is expected according to the Young’s equation. As the temperature increases, the number and average energy of the hydrogen bonds both decrease, and the hydrogen bonds tend to aggregate at the bottom of the nano-droplets.

scholarly journals Optical Measurements of Water Lenses in Ice

1987 ◽  
Vol 33 (114) ◽  
pp. 159-161 ◽  
Author(s):  
M.E.R. Walford ◽  
D.W. Roberts ◽  
I. Hill
Keyword(s):  
Grain Boundary ◽  
Specific Surface ◽  
Dihedral Angle ◽  
Focal Length ◽  
Water System ◽  
Optical Measurements ◽  
Free Energies ◽  
Minor Revision ◽  
Experimental Values ◽  
Ice Water

AbstractThe dihedral angle of water at a grain boundary in ice is found, by measuring the optical focal length of lenticular water inclusions, to be 33.6 ± 0.7°. The new result leads to only minor revision of published experimental values of specific surface free energies in the ice–water system (Ketcham and Hobbs, 1969).

scholarly journals Synergistic synthesis of quasi-monocrystal CdS nanoboxes with high-energy facets

2015 ◽  
Vol 3 (46) ◽  
pp. 23106-23112 ◽  
Author(s):  
Li-Li Han ◽  
Sergei A. Kulinich ◽  
Yang-Yang Zhang ◽  
Jin Zou ◽  
Hui Liu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Single Crystal ◽  
Cation Exchange ◽  
Surface Area ◽  
Specific Surface Area ◽  
Chemical Etching ◽  
Metastable Phase ◽  
High Energy ◽  
Large Specific Surface Area ◽  
Photocatalytic Activities

CdS single-crystal nanoboxes with a small size, metastable phase, a large specific surface area, and high-energy {100} facets, obtained by attacking PbS nanosized cubes through synergic reactions of cation exchange and chemical etching, exhibit exceptional photocatalytic activities.

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