The Role of Surface Active Agents on Etching Grain Boundaries in Steels / Die Rolle von oberflächenaktiven Stoffen bei der Ätzung von Korngrenzen in Stählen

1987 ◽  
Vol 24 (11) ◽  
pp. 521-534
Author(s):  
Xiaoxia Jiang ◽  
Yulin Zhou
Keyword(s):  
Grain Boundaries ◽  
Surface Active Agents ◽  
Surface Active

The Role of Surface Active Agents in Sulfonation of Double Bonds

2014 ◽  
Vol 51 (4) ◽  
pp. 352-355
Author(s):  
Dariush Farkhani ◽  
Ali Asghar Khalili ◽  
Ali Mehdizadeh
Keyword(s):  
Double Bonds ◽  
Surface Active Agents ◽  
Surface Active

scholarly journals Potential Role of Thiobacillus caldus in Arsenopyrite Bioleaching

1999 ◽  
Vol 65 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Mark Dopson ◽  
E. Börje Lindström
Keyword(s):  
Mixed Culture ◽  
Pure Culture ◽  
Potential Role ◽  
Mixotrophic Growth ◽  
Moderately Thermophilic ◽  
Surface Active Agents ◽  
Pure Cultures ◽  
Surface Active ◽  
Leaching Efficiency

ABSTRACT We investigated the potential role of the three strains ofThiobacillus caldus (KU, BC13, and C-SH12) in arsenopyrite leaching in combination with a moderately thermophilic iron oxidizer,Sulfobacillus thermosulfidooxidans. Pure cultures ofT. caldus and S. thermosulfidooxidans were used as well as defined mixed cultures. By measuring released iron, tetrathionate, and sulfur concentrations, we found that the presence ofT. caldus KU and BC13 in the defined mixed culture lowered the concentration of sulfur, and levels of tetrathionate were comparable to or lower than those in the presence of S. thermosulfidooxidans. This suggests that T. caldusgrows on the sulfur compounds that build up during leaching, increasing the arsenopyrite-leaching efficiency. This result was similar to leaching arsenopyrite with a pure culture of S. thermosulfidooxidans in the presence of yeast extract. Therefore, three possible roles of T. caldus in the leaching environment can be hypothesized: to remove the buildup of solid sulfur that can cause an inhibitory layer on the surface of the mineral, to aid heterotrophic and mixotrophic growth by the release of organic chemicals, and to solubilize solid sulfur by the production of surface-active agents. The results showed that T. caldus KU was the most efficient at leaching arsenopyrite under the conditions tested, followed by BC13, and finally C-SH12.

scholarly journals SURFACTANT MATERIAL PROPERTIES AND CORONAVIRUS SURFACE: A SURFACE INTERACTION FOR COVID-19 TREATMENT AND VACCINATION

2021 ◽  
pp. 1-6
Author(s):  
FIRDOOS AHMAD ITOO ◽  
JAN MOHAMMAD MIR
Keyword(s):  
Effective Treatment ◽  
Material Properties ◽  
Ebola Virus ◽  
Structural Components ◽  
Main Mode ◽  
Surface Active Agents ◽  
Surface Active ◽  
Surfactant Material ◽  
Surface Active Compounds

Generally, the structural components of infectious diseases causing viruses like coronavirus, Ebola virus, etc., are mainly focused on developing effective treatment and vaccines. Meanwhile, the spike proteins play a major role in knowing the profound way out to curtail the respective infectivity. S1 and S2 act as the two main subunits to render prime significance to reveal the interaction of surface-active agents in this context. Keeping in view the importance of surfactants in developing effective treatment and vaccine for the coronavirus infectious disease-2019 (COVID-19), this article describes the surface chemistry of this quest. The surface action being the main mode of infectivity can thus be halted by using surface-active compounds (surfactants). Therefore, this review emphasizes the sound role of surface action linked with COVID-19 treatment and vaccination.

Wind-generated waves in thin liquid films with soluble contaminant

1971 ◽  
Vol 45 (3) ◽  
pp. 527-544 ◽  
Author(s):  
F. I. P. Smith ◽  
Alex D. D. Craik
Keyword(s):  
Surface Active Agent ◽  
Active Agent ◽  
Theoretical Work ◽  
Liquid Films ◽  
Stream Flows ◽  
Surface Active Agents ◽  
Air Stream ◽  
Surface Active ◽  
The Stability

Craik (1968) has previously examined the stability of horizontal liquid films when an air stream flows over the liquid surface and when the surface is contaminated by an insoluble surface-active agent. The present theoretical work extends this investigation to examine the role of soluble surface-active agents for cases where the liquid Reynolds number is small. This role is found to be a rather complex one which, under suitable conditions, may be either stabilizing or destabilizing.Related experimental work is described which yields results in qualitative agreement with the theoretical analysis.

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