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.

scholarly journals THE PATHOGENESIS OF HYPERLIPEMIA INDUCED BY MEANS OF SURFACE-ACTIVE AGENTS

1956 ◽  
Vol 104 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Robert L. Hirsch ◽  
Aaron Kellner
Keyword(s):  
Surface Active Agent ◽  
Active Agent ◽  
Subcutaneous Injections ◽  
Surface Active Agents ◽  
Triton Wr 1339 ◽  
Surface Active

Mice rendered hyperlipemic by means of intravenous or subcutaneous injections of triton WR 1339 were found to have an increase in the total amount of cholesterol in their bodies. This observation indicates that the injected surface-active agent affects the metabolism of cholesterol and brings about hyperlipemia by augmenting the synthesis of lipides, or by interfering with their degradation or excretion, or by some combination of these factors. The implications of the findings for the pathogenesis of the hyperlipemia induced by triton are discussed further in the accompanying paper (16).

Impacts of Surface-Active Agents on the Crystal Structure of Nano Manganese Oxide

2013 ◽  
Vol 798-799 ◽  
pp. 125-129
Author(s):  
Fu Yun Li ◽  
Jing Wang ◽  
Ying Yang Qin ◽  
Li Zhen Yang
Keyword(s):  
Crystal Structure ◽  
Manganese Oxide ◽  
Hydrothermal Method ◽  
Manganese Oxides ◽  
Surface Active Agent ◽  
Active Agent ◽  
Tween 80 ◽  
Surface Active Agents ◽  
Surface Active ◽  
Addition Amount

The nano manganese oxides were prepared with the hydrothermal method by adding surface-active agent. The influence of the type and addition amount of surface-active agent on the preparation of nano manganese oxides was studied. The products were characterized with XRD. Experimental results show that MnOOH is obtained at 180°C with the addition of N,N,N-trimethyl-1-dodecanaminium bromide, and Mn3O4is obtained at 180 °C with OP Emulsifier or Tween-80 added. Different addition amount of surface-active agent would have diverse effects on the purity of products.

Research on Optimal Formula of Dustfall Agent to Remove Blasting Smoke

2012 ◽  
Vol 534 ◽  
pp. 298-303
Author(s):  
Wei Niu ◽  
Zhong An Jiang ◽  
Ju Shi Chen
Keyword(s):  
Surface Active Agent ◽  
Sodium Dodecyl ◽  
Active Agent ◽  
Base Material ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Base Materials ◽  
Surface Active Agents ◽  
Optimal Surface ◽  
Dodecyl Benzene Sulfonate ◽  
Surface Active

In order to reduce dust produced during the blasting, effective measures according to smoke components and properties are required to be taken. The experiment adopted a number of base materials and surface-active agents to reduce the dust in smoke. Besides, corresponding additives were adopted to reduce poisonous and harmful gases during the blasting. Experiments focused on wettability and surface tension, using contrast experiment to determine optimal base material and surface-active agent, and also studied the influence of additives on their performance. The experimental results suggested that： sodium chloride was the optimal base material, sodium dodecyl benzene sulfonate was the optimal surface-active agent, and copper sulphate and ammonium chloride as additives had almost no influence on performance of surface-active agent and base material. Therefore, adding this dustfall agent to the water bag during the blasting can effectively reduce the concentration of smoke.

Development of Nifedipine Amorphous Solid Dispersion Composed of Surface-Active Agents

2021 ◽  
Vol 901 ◽  
pp. 35-39
Author(s):  
Sukannika Tubtimsri ◽  
Yotsanan Weerapol
Keyword(s):  
Surface Active Agent ◽  
Active Agent ◽  
Amorphous Solid ◽  
Drug Dissolution ◽  
Amorphous Solid Dispersion ◽  
Polysorbate 80 ◽  
X Ray ◽  
Surface Active Agents ◽  
Surface Active ◽  
Methacrylate Copolymer

The amorphous solid dispersions (ASDs) containing amino methacrylate copolymer and surface-active agents were prepared to improve the nifedipine (NDP) dissolution. The different types of surface-active agent i.e., polysorbates 80, sodium lauryl sulfate (SLS) and polyethylene glycol (PEG) 400 were used. In order to evaluate the ASDs formulation,powder X-ray diffractometry and thermal analysis to characterize NDP crystallinity in ASDs and the dissolution study of NDP have been performed to compare the dissolution profiles. The ASDs were kept for 6 months to investigate the stability. In the X-ray diffraction pattern, no peak was observed in all samples of ASDs. No peak was found in sample of all ASDs from the thermograms. These results suggest that the drug may be molecularly dispersed in matrix of amino methacrylate copolymer. The drug dissolution at 120 min, from ASDs without surface-active agent and NDP powder were 58.31% and 17.95%, respectively. The dissolved NDP from ASDs composed of SLS, polysorbate 80 and PEG400 were 96.25%, 88.86% and 75.32%, respectively. These results may occur due to the reduction of surface tension, the addition of the low amount of high efficiency of surface-active agent e.g., SLS (compared with PEG400 and polysorbate 80) provided the higher NDP dissolution. The content analysis of NDP in selected ASDs was studied at the end of 3 and 6 months, the NDP content remained unchanged after storage.

Enhanced stability and optoelectronic properties of MAPbI3 films by a cationic surface-active agent for perovskite solar cells

2018 ◽  
Vol 6 (23) ◽  
pp. 10825-10834 ◽  
Author(s):  
He Zhao ◽  
Shirong Wang ◽  
Mengna Sun ◽  
Fei Zhang ◽  
Xianggao Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Surface Active Agent ◽  
Perovskite Solar Cells ◽  
Active Agent ◽  
Optoelectronic Properties ◽  
Hydrophobic Effects ◽  
Surface Active ◽  
The Stability ◽  
Enhanced Stability

Passivation and hydrophobic effects can significantly enhance the stability and optoelectronic properties of MAPbI3 films.

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