scholarly journals Proposal and applicability of a method to evaluate surface tension of liquid using large volume sessile drop in gravity

2020 ◽  
Vol 38 (3) ◽  
pp. 193-198
Author(s):  
Kunio TAKAHASHI ◽  
Yoji IGUCHI ◽  
Keiichiro HAMADA ◽  
HEMTHAVY Pasomphone ◽  
Shigeki SAITO
Keyword(s):  
Surface Tension ◽  
Large Volume ◽  
Sessile Drop

Proposal and applicability of a method to evaluate surface tension of liquid using large volume sessile drop in gravity

2019 ◽  
Vol 33 (4-6) ◽  
pp. 241-247
Author(s):  
Kunio Takahashi ◽  
Yoji Iguchi ◽  
Keiichiro Hamada ◽  
Pasomphone Hemthavy ◽  
Shigeki Saito
Keyword(s):  
Surface Tension ◽  
Large Volume ◽  
Sessile Drop

scholarly journals Lifting a sessile oil drop from a superamphiphobic surface with an impacting one

2020 ◽  
Vol 6 (34) ◽  
pp. eaba4330
Author(s):  
Olinka Ramírez-Soto ◽  
Vatsal Sanjay ◽  
Detlef Lohse ◽  
Jonathan T. Pham ◽  
Doris Vollmer
Keyword(s):  
Surface Tension ◽  
Energy Transfer ◽  
Impact Velocity ◽  
Sessile Drop ◽  
Cloud Formation ◽  
Impact Dynamics ◽  
Combustion Engines ◽  
Intrinsic Properties ◽  
Natural Processes ◽  
The Impact

Colliding drops are encountered in everyday technologies and natural processes, from combustion engines and commodity sprays to raindrops and cloud formation. The outcome of a collision depends on many factors, including the impact velocity and the degree of alignment, and intrinsic properties like surface tension. Yet, little is known on binary impact dynamics of low-surface-tension drops on a low-wetting surface. We investigate the dynamics of an oil drop impacting an identical sessile drop sitting on a superamphiphobic surface. We observe five rebound scenarios, four of which do not involve coalescence. We describe two previously unexplored cases for sessile drop liftoff, resulting from drop-on-drop impact. Numerical simulations quantitatively reproduce the rebound scenarios and enable quantification of velocity profiles, energy transfer, and viscous dissipation. Our results illustrate how varying the offset from head-on alignment and the impact velocity results in controllable rebound dynamics for oil drop collisions on superamphiphobic surfaces.

Constrained sessile drop as a new configuration to measure low surface tension in lung surfactant systems

2004 ◽  
Vol 97 (2) ◽  
pp. 704-715 ◽  
Author(s):  
Laura M. Y. Yu ◽  
James J. Lu ◽  
Yawen W. Chan ◽  
Amy Ng ◽  
Ling Zhang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Surface Area ◽  
Sessile Drop ◽  
Lung Surfactant ◽  
Design Feature ◽  
The Novel ◽  
Drop Shape ◽  
Surfactant Preparation ◽  
Complete Automation ◽  
Sharp Knife

Existing methodology for surface tension measurements based on drop shapes suffers from the shortcoming that it is not capable to function at very low surface tension if the liquid dispersion is opaque, such as therapeutic lung surfactants at clinically relevant concentrations. The novel configuration proposed here removes the two big restrictions, i.e., the film leakage problem that is encountered with such methods as the pulsating bubble surfactometer as well as the pendant drop arrangement, and the problem of the opaqueness of the liquid, as in the original captive bubble arrangement. A sharp knife edge is the key design feature in the constrained sessile drop that avoids film leakage at low surface tension. The use of the constrained sessile drop configuration in conjunction with axisymmetric drop shape analysis to measure surface tension allows complete automation of the setup. Dynamic studies with lung surfactant can be performed readily by changing the volume of a sessile drop, and thus the surface area, by means of a motor-driven syringe. To illustrate the validity of using this configuration, experiments were performed using an exogenous lung surfactant preparation, bovine lipid extract surfactant (BLES) at 5.0 mg/ml. A comparison of results obtained for BLES at low concentration between the constrained sessile drop and captive bubble arrangement shows excellent agreement between the two approaches. When the surface area of the BLES film (0.5 mg/ml) was compressed by about the same amount in both systems, the minimum surface tensions attained were identical within the 95% confidence limits.

Synthesis of Porous Heat-Insulating Material from Industrial Waste

2018 ◽  
Vol 284 ◽  
pp. 82-89
Author(s):  
Liudmila Shtirc ◽  
Svetlana G. Vlasova ◽  
K. Zemlyanoi
Keyword(s):  
Surface Tension ◽  
Industrial Waste ◽  
Sessile Drop ◽  
Foam Glass ◽  
Temperature Drop ◽  
Sessile Drop Method ◽  
Insulating Material ◽  
Stable Temperature ◽  
Crystallization Ability ◽  
Glass Compositions

We chose two glass compositions suitable for the synthesis of foam glass. The influence of additive at the amorphous silica charge in the amount of 20% and 100%, a by-product in the leaching of serpentinite, was studied. By the method of stable temperature drop, the crystallization ability of the welded glass compositions was studied. The surface tension was measured by the sessile drop method.

scholarly journals Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 98 ◽  
Author(s):  
Francesca Borgioli ◽  
Emanuele Galvanetto ◽  
Tiberio Bacci
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Surface Morphology ◽  
Corrosion Behavior ◽  
Sessile Drop ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Temperature Plasma

Low-temperature nitriding of austenitic stainless steels produces modified surface layers, consisting mainly of the S phase, which improve surface hardness and corrosion resistance. Because of the localized plastic deformations, owing to modified layer formation, and ion bombardment occurring during the process itself, this treatment produces also modifications of surface morphology and roughness, which can affect wettability and corrosion behavior. In this study the effects of plasma nitriding, performed using different treatment conditions, on the surface morphology and roughness, and thus on wettability and corrosion resistance, of AISI 202 specimens with different initial finishings (2D and polished finishing) were investigated. Different probe liquids, having both high (bi-distilled water and solution of 3.5% NaCl) and low (ethanol and rapeseed oil) surface tension, were employed for assessing the wetting behavior with the sessile drop method. The contact angle values for water increased markedly when nitriding was performed on polished samples, while this increase was smaller for 2D samples, and on selected specimens a hydrophobic behavior was observed. Very low contact angle values were registered using low surface tension liquids, suggesting an oleophilic behavior. Corrosion resistance in a 5% NaCl solution was assessed, and it depended on the characteristics of the nitrided specimens.

scholarly journals Optimisation of purification techniques for the preparation of large-volume aqueous solar nanoparticle inks for organic photovoltaics

2018 ◽  
Vol 9 ◽  
pp. 649-659 ◽  
Author(s):  
Furqan Almyahi ◽  
Thomas R Andersen ◽  
Nathan A Cooling ◽  
Natalie P Holmes ◽  
Matthew J Griffith ◽  
...  
Keyword(s):  
Surface Tension ◽  
Surface Morphology ◽  
Large Volume ◽  
Maximum Efficiency ◽  
Device Performance ◽  
Dilution Factor ◽  
Crossflow Ultrafiltration ◽  
Vis Spectroscopy ◽  
Nanoparticle Inks ◽  
The Impact

In this study we have optimised the preparation conditions for large-volume nanoparticle inks, based on poly(3-hexylthiophene) (P3HT):indene-C60 multiadducts (ICxA), through two purification processes: centrifugal and crossflow ultrafiltration. The impact of purification is twofold: firstly, removal of excess sodium dodecyl sulfate (SDS) surfactant from the ink and, secondly, concentration of the photoactive components in the ink. The removal of SDS was studied in detail both by a UV–vis spectroscopy-based method and by surface tension measurements of the nanoparticle ink filtrate; revealing that centrifugal ultrafiltration removed SDS at a higher rate than crossflow ultrafiltration even though a similar filter was applied in both cases (10,000 Da M w cut-off). The influence of SDS concentration on the aqueous solar nanoparticle (ASNP) inks was investigated by monitoring the surface morphology/topography of the ASNP films using atomic force microscopy (AFM) and scanning electron microscopy (SEM) and photovoltaic device performance as a function of ultrafiltration (decreasing SDS content). The surface morphology/topography showed, as expected, a decreased number of SDS crystallites on the surface of the ASNP film with increased ultrafiltration steps. The device performance revealed distinct peaks in efficiency with ultrafiltration: centrifuge purified inks reached a maximum efficiency at a dilution factor of 7.8 × 104, while crossflow purified inks did not reach a maximum efficiency until a dilution factor of 6.1 × 109. This difference was ascribed to the different wetting properties of the prepared inks and was further corroborated by surface tension measurements of the ASNP inks which revealed that the peak efficiencies for both methods occurred for similar surface tension values of 48.1 and 48.8 mN m−1. This work demonstrates that addressing the surface tension of large-volume ASNP inks is key to the reproducible fabrication of nanoparticle photovoltaic devices.

An improved method of sessile drop for determining the surface tension of liquids

2010 ◽  
Vol 48 (2) ◽  
pp. 176-180 ◽  
Author(s):  
L. B. Direktor ◽  
V. M. Zaichenko ◽  
I. L. Maikov
Keyword(s):  
Surface Tension ◽  
Sessile Drop ◽  
Improved Method
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