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Sessile drop technique

About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.


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TL;DR: In this article, the volume change of the easy glass-forming alloy Pd43Cu27Ni10P20 was investigated continuously from the liquid to the vitreous state upon cooling at 10 K/min by means of the sessile drop technique.
Abstract: The volume change of the easy glass-forming alloy Pd43Cu27Ni10P20 was investigated continuously from the liquid to the vitreous state upon cooling at 10 K/min by means of the sessile drop technique. From the data obtained on density and thermal expansion, the specific volume as a function of temperature was deduced in the complete temperature range of the stable and the undercooled liquid as well as in the vitreous state for this alloy. Thus, the temperature dependence of the specific volume V(T) could be compared over the entire liquid range of a metallic glass former to that of the enthalpy H(T) obtained from preceding calorimetric measurements. A strong correlation between both thermodynamic functions becomes evident from this comparison and is interpreted on the basis of free-volume theory. The increase of the heat capacity at the glass transition can be explicitly explained by the creation and annihilation of free volume.

23 citations

Journal ArticleDOI
01 May 2004-Polimery
TL;DR: In the sessile drop method, the equilibrium (static) or dynamic contact angle (CA) of solids can be measured, and the Wilhelmy method is used to measure the force which is needed to overcome the resistance of the liquid as the solid plate with known wetted length is immersed in or withdrawn from the liquid as discussed by the authors.
Abstract: Many problems related to the quality of protective coatings for more sophisticated applications can be solved on the basis of the wettability of their surfaces measurements. The equilibrium (static) or dynamic contact angle (CA) of solids can be measured and the sessile drop method or Wilhelmy method are usually applied. In the sessile drop method CA is measured optically. The measured values of static CA are influenced by evaporation of the liquid, absorption of the liquid by porous substrate (e.g. paper, building material) and other chemical or physical interactions occurring on the solid surface. The Wilhelmy method is based on the measurements of the force which is needed to overcome the resistance of the liquid as the solid plate with known wetted length is immersed in or withdrawn from the liquid of known surface tension. The precision of the contact angle measurements by Wilhelmy method is higher as compared with the sessile drop method. Very important factor highly influencing the quality of CA measurements is the proper selection of applied liquids which should be selected according to the applied measuring method. The careful selection of the method of CA measurements is a crucial factor influencing the possibility of practical application of the results of wettability measurements.

23 citations

Journal ArticleDOI
TL;DR: In this article, three implantation doses of Si ions (5 × 1015, 1 × 1016, 5 × 101 6 ions/cm2) were implanted into the 6H-SiC substrate and the interfacial chemical reaction of Cu-Sn/SiC wetting couples was investigated and discussed.
Abstract: The wettability of the metal/SiC system is not always excellent, resulting in the limitation of the widespread use of SiC ceramic. In this paper, three implantation doses of Si ions (5 × 1015, 1 × 1016, 5 × 1016 ions/cm2) were implanted into the 6H-SiC substrate. The wetting of Cu-(2.5, 5, 7.5, 10) Sn alloys on the pristine and Si-SiC were studied by the sessile drop technique, and the interfacial chemical reaction of Cu-Sn/SiC wetting couples was investigated and discussed. The Si ion can markedly enhance the wetting of Cu-Sn on 6H-SiC substrate, and those of the corresponding contact angles (θ) are raised partly, with the Si ion dose increasing due to the weakening interfacial chemical reactions among four Cu-Sn alloys and 6H-SiC ceramics. Moreover, the θ of Cu-Sn on (Si-)SiC substrate is first decreased and then increased from ~62° to ~39°, and ~70° and ~140°, with the Sn concentration increasing from 2.5%, 5% and 7.5% to 10%, which is linked to the reactivity of Cu-Sn alloys and SiC ceramic and the variation of liquid-vapor surface energy. Particularly, only a continuous graphite layer is formed at the interface of the Cu-10Sn/Si-SiC system, resulting in a higher contact angle (>40°).

23 citations

Journal ArticleDOI
TL;DR: In this paper, a sessile drop technique combined with X-ray radiography was used to measure the contact angle formed between aluminum and pure hot-pressed TiB2, carbon/TiB2 composite, graphite, and a carbonaceous cement in cryolite melts.
Abstract: Both pure TiB2 and carbon/TiB2 composites are potential cathode materials for aluminum reduction cells. An important requirement for this application is that the material be wetted by aluminum in cryolite melts. A sessile drop technique combined with X-ray radiography was used to measure the contact angle formed between aluminum and pure hot-pressed TiB2, carbon/TiB2 composite, graphite, and a carbonaceous cement in cryolite melts. Pure hot-pressed TiB2 was found to be completely wetted by aluminum in cryolite melts. Graphite and the carbonaceous cement were nonwetted by aluminum in cryolite melts, the contact angles being in the range of 144 to 158 deg. The contact angle formed by aluminum on the carbon/TiB2 composite in cryolite melts exhibited time dependency. It was proposed the time dependency was due to (1) removal of contamination from the composite surface and (2) removal of aluminum from the drop. The wettability of the composite material increased as the TiB2 content increased.

23 citations

Journal ArticleDOI
28 Jan 2019
TL;DR: In this paper, the surface roughness and surface topography were measured using profilometer and morphology of the surface was studied using a scanning electron microscope, and the wettability of the finished surface was analyzed by measuring the contact angle (θ) for three liquids (water, formamide, and diiodomethane) using the sessile drop technique.
Abstract: Unidirectional abrasive flow finishing process was used to finish stainless steel SS316L and titanium alloy Ti-6Al-4V materials which are widely used as implant materials. Viscoelastic polymer-based flexible abrasive media was used to finish these surfaces with different pressure and number of cycles. The obtained surface roughness and surface topography were measured using profilometer, and morphology of the surface was studied using a scanning electron microscope. Further, the wettability of the finished surface was studied by measuring the contact angle (θ) for three liquids—water, formamide, and diiodomethane using the sessile drop technique. The measured contact angles were used to ascertain the surface free energy components using Van Oss Chaudhury-Good equation. Significant difference was observed on surface roughness, contact angle, and surface energy of the machined surfaces at different finishing cycles. Also, the different tendencies of the droplet contact angle and surface energy have been observed along the direction parallel and perpendicular to the finishing direction and it gave a strong conclusion that surface roughness and surface textures play a significant role in wetting characteristics. So, this work provides an overview of the interaction between droplet and surface topography of finished SS316L and Ti-6Al-4V surfaces. Further, an empirical model has been developed using the response surface methodology (RSM) for output responses namely, average surface roughness (R a ) and material removed (MR). Interactive effects of number of cycles and pressure on average surface roughness and material removed are discussed in this paper.

23 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202354
2022106
202189
2020105
2019100
2018116