Surface Properties of Molten Bismuth-Bismuth Chloride in Contact with Uranium Dioxide

1961 ◽  
Vol 14 (3) ◽  
pp. 409 ◽  
Author(s):  
DH Bradhurst ◽  
AS Buchanan
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Surface Properties ◽  
Uranium Dioxide ◽  
Surface Active Agent ◽  
Active Agent ◽  
Effective Surface ◽  
Liquid Bismuth ◽  
Surface Active ◽  
Bismuth Chloride

The wetting of uranium dioxide by liquid bismuth has been investigated by means of measurements of surface tension of the liquid and contact angle of the liquid on the solid. Bismuth chloride in low concentration was found to be a very effective surface active agent in improving the wetting of the solid by the metal.

scholarly journals Effect of an Alcohol-Based Caries Detector on the Surface Tension of Sodium Hypochlorite Preparations

2015 ◽  
Vol 26 (1) ◽  
pp. 66-68 ◽  
Author(s):  
Giampiero Rossi-Fedele ◽  
Andrea R. Guastalli
Keyword(s):  
Surface Tension ◽  
Sodium Hypochlorite ◽  
Surface Active Agent ◽  
Active Agent ◽  
Pendant Drop ◽  
Root Canal Irrigants ◽  
Significant Difference ◽  
Surface Active ◽  
Pendant Drop Method

The purpose of this study was to evaluate the effect of an alcohol-based caries detector (Kurakay) on the surface tension of a conventional sodium hypochlorite (NaOCl) preparation, and a product containing a surface-active agent (Chlor-XTRA). The surface tensions of the following solutions were tested: NaOCl, a mixture of NaOCl and Kurakay 9:1 w/w, Chlor-XTRA, a mixture of Chlor-XTRA and Kurakay 9:1 w/w. Ten measurements per test solution were made at 20 C, using an optical method called the "Pendant drop method", with a commercially available apparatus. The addition of Kurakay reduced the surface tension for NaOCl (p<0.05) whilst no significant difference was detected for Chlor-XTRA (p>0.05). Statistically significant differences between the NaOCl and Chlor-XTRA groups were found (p<0.05). The addition of an alcohol-based caries detector resulted in a reduction of the original surface tension values for NaOCl only. Taking into account the fact that mixtures of NaOCl and Kurakay have been used to assess the penetration of root canal irrigants in vitro, the related changes in surface tension are a possible source of bias.

A reciprocal theorem for Marangoni propulsion

2014 ◽  
Vol 741 ◽  
Author(s):  
Hassan Masoud ◽  
Howard A. Stone
Keyword(s):  
Surface Tension ◽  
Surface Active Agent ◽  
Active Agent ◽  
Reynolds Numbers ◽  
The Self ◽  
Reciprocal Theorem ◽  
Surface Tension Gradient ◽  
Spheroidal Particle ◽  
Surface Active ◽  
Translational Speed

AbstractWe study the Marangoni propulsion of a spheroidal particle located at a liquid–gas interface. The particle asymmetrically releases an insoluble surface-active agent and so creates and maintains a surface tension gradient leading to the self-propulsion. Assuming that the surface tension has a linear dependence on the concentration of the released agent, we derive closed-form expressions for the translational speed of the particle in the limit of small capillary, Péclet and Reynolds numbers. Our derivations are based on the Lorentz reciprocal theorem, which eliminates the need to develop the detailed flow field.

scholarly journals Perlukah Kita Menggunakan Obat Kumur?

2017 ◽  
Vol 2 (4) ◽  
pp. 14
Author(s):  
Nia Yuniarsih
Keyword(s):  
Surface Tension ◽  
Surface Active Agent ◽  
Active Agent ◽  
Wetting Agent ◽  
Surface Active

Obat kumur dapat digunakan untuk dua tujuan. Mereka bersifat terapeutik dan kosmetik. Bersifat terapeutik pada pembedahan mulut atau mencuci, untuk mengurangi plak, radang gusi, karies gigi, dan stomatitis.Surfaktan digunakan karena dapat membantu pelarut rasa dan menghilangkan kotoran dengan memberikan tindakan berbusa. Agen pembasah (wetting agent) didefinisikan sebagai senyawa yang mempunyai aktifitas permukaan (surface active agent) sehingga dapat menurunkan tegangan permukaan (surface tension) antara udara – cairan dan cairan – cairan yang terdapat dalam suatu sistem.Jadi obat kumur merupakan pembersih tambahan dan bukan pengganti. Pada akhirnya, obat kumur hanya berfungsi untuk "penyegar" mulut.Keyword : obat kumur, radang, aktivitas permukaan, mulut

Emulsifying composition for increase of oil recovery efficiency of high viscous oils

2021 ◽  
pp. 22-28
Author(s):  
R.G. Ismailov ◽  
◽  
E.F. Veliev ◽  
◽  
◽  
...  
Keyword(s):  
Surface Tension ◽  
Oil Recovery ◽  
Emulsion Stability ◽  
Surface Active Agent ◽  
Active Agent ◽  
Heavy Oils ◽  
Viscous Oil ◽  
Surface Active ◽  
Oil Water ◽  
The Stability

Nowadays, one of the more perspective technologies for oil recovery increase in the fields with heavy oils is formation of intrastratal emulsion. The paper presents the research on the increase of oil recovery in the fields with heavy oil via injection of combined composition based on the viscosity minimizer and surface active agent. Obtained composition allows significantly increase the stability of intrastratal emulsion, dramatically reducing the values of surface tension in the border of oil/water. The analysis of synergetic efficiency for suggested composition on the emulsion stability, surface tension and rheological properties has been carried out. More efficient concentrations of composition components have been specified. Obtained results have been justified with experiments on the replacement of high viscous oil from Galmaz field on the sand packed tubes of reservoir.

Application Performances of Gemini Surfactant as Silk Degumming Auxiliaries

2011 ◽  
Vol 233-235 ◽  
pp. 147-150
Author(s):  
Xiang Rong Wang ◽  
Peng Kun Fan ◽  
Yun Zhang
Keyword(s):  
Surface Tension ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Surface Active Agent ◽  
Active Agent ◽  
Silk Fabric ◽  
Surface Activities ◽  
Anionic Gemini Surfactant ◽  
Surface Active ◽  
Better Than

To investigate the Application Performances of the anionic gemini surfactant Ethanediyl-α,ω-bis(sodium N-lauroyl-β-alaninate)(EBLA) as silk degumming auxiliaries, the surface activity of the gemini surfactant was measured by the surface tension method. The dependence of degumming rate on surfactant concentration and degumming time were discussed, and the whiteness, tensile strength and capillary effect of the degummed silk fabric were measured. The results revealed that the gemini surfactant possessed excellent surface activities and its degumming effect was pretty good, the critical micelle concentration(CMC) of EBLA was 4.74×10-5 mol·dm-3, and the surface tension at the CMC(γCMC) of it was 26.6 mN·m-1. With lower dosage of the surface active agent and shorter degumming time, the perform indexes of the fabric degummed by the gemini surfactant EBLA were better than those of the fabric degummed by marseille soap.

scholarly journals Morinda citrifoliia L. as a renewable raw material for surface active agent

2018 ◽  
Vol 204 ◽  
pp. 05011
Author(s):  
Trismawati ◽  
D. Wikanaji
Keyword(s):  
Surface Tension ◽  
Fatty Acid ◽  
Surface Active Agent ◽  
Active Agent ◽  
Raw Material ◽  
Morinda Citrifolia ◽  
Synthetic Surfactant ◽  
Diffusion Experiment ◽  
Surface Active ◽  
Poly Unsaturated Fatty Acid

Surface active agent (surfactant) is a substance or a blend of substances that lower the surface tension or interfacial tension between two liquids. It contains both hydrophobic groups (its tail) and hydrophilic groups (its head). Surfactants lower the surface tension of a liquid by spreading spontaneously over its surface. To understand its suitability for raw material of surfactant, the seed of Morinda citrifolia L is extracted for its fatty acid contents and evaluated for its spreading ability into other liquid. Its fatty acid contents are analyzed by FTIR and GCMS method and its spreading ability is evaluated by its diffusion characteristic using Helle Shaw Cell. From FTIR it is known that the oil seed of Morinda citrifolia has functional groups suitable for the hydrophobic part of surfactant. From GCMS it is known that the seed of Morinda citrifolia L contains huge amount of poly unsaturated fatty acid (PUFA) of C19:2 suitable for the hydrophobic part of surfactant. From diffusion experiment using Hele Shaw Cell it is known that the spreading ability of its PUFA in oil phase is approaching its commercial synthetic surfactant has but it is not in water phase.

Preparation of a New Type Cleanup Additive

2014 ◽  
Vol 884-885 ◽  
pp. 224-227
Author(s):  
Zeng Lin Wang ◽  
Jian Bo Gao ◽  
Hai Ming Fan ◽  
Bing Cheng Li ◽  
Hong Tao Zhang
Keyword(s):  
Surface Tension ◽  
Interfacial Tension ◽  
Surface Active Agent ◽  
Active Agent ◽  
Experimental Results ◽  
Interface Properties ◽  
Micro Emulsion ◽  
Low Interfacial Tension ◽  
New Type ◽  
Surface Active

Nonionic surface active agent AO-1, n-butanol, kerosene and water were mixed in varying proportions to compound micro-emulsion. According to different phase states of each micro-emulsion, some systems with representative were picked up, and then tested the interface properties of oil phase of the systems above. The experimental results show that there is a system with low interfacial tension and steady surface tension.

Adjunctive Use of a Surface-Active Agent in Extracorporeal Circulation

Circulation ◽  
1966 ◽  
Vol 33 (4s1) ◽  
Author(s):  
YOSHIMASA MIYAUCHI ◽  
TAKAYUKI INOUE ◽  
BRUCE C. PATON
Keyword(s):  
Extracorporeal Circulation ◽  
Surface Active Agent ◽  
Active Agent ◽  
Surface Active
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