scholarly journals Ir-Ni based mono and bimetallic nanocrystals: synthesis, characterization and effect of cationic, anionic, and non-ionic stabilizers

2021 ◽  
pp. 209-220
Author(s):  
Anjali Goel ◽  
Shikha Shikha ◽  
Shivani Shivani ◽  
Sudha Tomar
Keyword(s):  
Reduction Method ◽  
Size Range ◽  
Surface Active Agent ◽  
Active Agent ◽  
Spherical Shape ◽  
Particle Size Range ◽  
Surface Active Agents ◽  
Bimetallic Nanocrystals ◽  
Surface Active ◽  
Cationic And Anionic Surfactants

Nickel based bimetallic nanocrystals, iridium-nickel play an imperative role in catalysis, electrocatalysis, and magnetic applications. In the present work Ir-Ni bimetallic nanoalloys were synthesized by modified polyol reduction method with different cationic, anionic, and non-ionic surface active agents like CTAB, SDS, TSC, and PVP. The non-ionic surface active agent PVP produced a better effect on nanoparticle size than cationic and anionic surfactants. The synthesized bimetallic nanocrystals were characterized by UV-Vis, XRD, FTIR, FESEM, and HRTEM techniques. XRD and FTIR verify the nature of synthesized bimetallic nanocrystals and the interaction between stabilizers and nanoparticles. HRTEM studies reveal that the PVP stabilized Ir-Ni (3:1) and Ir-Ni (1:1) bimetallic nanocrystals are small in size and less dispersed. Particle size range of these nanoparticles is from (1.77-2.36) nm. FESEM images show that nanoparticles are in quasi spherical shape. EDX analysis indicates that the resultant particles are core shell structure with Ni core and Ir shell.

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.

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.

The Influence of Different Kinds of Surfactants on Rheology in Polymer/Surfactant Complex Flooding

2013 ◽  
Vol 437 ◽  
pp. 1089-1092
Author(s):  
Wei Lin Cui ◽  
Wu Ju Xu ◽  
Ling Jian Song
Keyword(s):  
Binary System ◽  
Enhanced Recovery ◽  
Surface Active Agent ◽  
Active Agent ◽  
Ionic Surfactant ◽  
Sweep Efficiency ◽  
Surface Active Agents ◽  
Linear Viscoelastic ◽  
Surface Active ◽  
Polymer Surfactant

Because of alkaline declining the sweep efficiency, causing scale formation problem in the reservoir and the well bottom and the tubular pipes, so polymer/surfactant compound flooding technology is the emphasis in the research of enhanced recovery. So the articles study the regulation of different kinds of surface active agents at different temperature by MARS Rheometer. The testing result showed that the variation of viscocity under the interaction between the surface active agent and association polymer according to “three stage” model .The linear viscoelastic region of stress decrease when different surface active agents are put into polymer liquor, and the higher frequency, the better elasticity of polymer liquor. The hydrophobic association between the surface active agents and polymer decrease with a higher temperature, but the ionic surfactant is aggravate. The systematic study of binary system rheology can contribute to correctly understand and apply binary system.

scholarly journals Synthesis of Anionic Surface Active Agents Containing Heterocyclic Moiety From Long Chain Fatty Alcohols

2017 ◽  
Vol 13 (10) ◽  
pp. 5935-5943
Author(s):  
Magda.H. Abdellattif ◽  
A.M.F. Eissa ◽  
H.M. Mohamed
Keyword(s):  
Biological Activities ◽  
Surface Active Agent ◽  
Active Agent ◽  
Fatty Alcohols ◽  
Chemical Structures ◽  
Surface Active Agents ◽  
Wetting Power ◽  
Surface Active ◽  
Anionic Surface ◽  
Long Chain

A series of novel groups of anionic surface active agent were synthesized. Synthesis of these surfactants via the reaction of long chain fatty alcohols (octyl, decyl and dodecyl) with maleic anhydride to give monoester. The monoester chloride reacted with amino derivatives of heterocyclic rings followed by addition of NaHSO3 .The surface tension, interfacial tension; Kraft point, emulsifying and wetting power were evaluated. Stability to hydrolysis, biodegradability and biological activities were measured. A comparison studies between the chemical structures and the results were done.   

The Research of Extracting Hippuric Acid from Breeding Wastewater

2012 ◽  
Vol 550-553 ◽  
pp. 2215-2218
Author(s):  
Qian Lin Chen ◽  
Yu Guo ◽  
Na Guo
Keyword(s):  
Waste Water ◽  
Mass Fraction ◽  
Hippuric Acid ◽  
Liquid Membrane ◽  
Surface Active Agent ◽  
Active Agent ◽  
Raw Material ◽  
Surface Active Agents ◽  
Surface Active ◽  
Coloring Matter

Hippuric acid as an important raw material used to synthesize medication and coloring matter, abound in urine of much animal, especially in cattle. Hippuric acid usually is letted into river and soil with the urine. But as its chemical stability, hippuric acid couldn’t be decomposed easily and pollute the environment. This research finds effectively liquid membrane to treat with such waste water such as breeding wastewater that contains high hippuric acid. In our study, the best liquid membrane was found by searching what and how much surface active agents and carrier are suitable, pH of out-water of the liquid membrane and concentration of NaOH in the in-water of liquid membrane. As the outcome shown, the best prescription is surface active agent T-151(2% mass fraction), liquid carrier TBP( 4% mass fraction), pH of out-water 2.0, concentration of NaOH in the in-water 0.50mol/L. Under the condition, extraction rate of hippuric acid from breeding wastewater can reach more than 98% during 9min.

THE DYEING OF NATURAL COTTON WITH DIRECT DYES: SOME EFFECTS DUE TO TEMPERATURE, DYE CONCENTRATION, AND ANIONIC SURFACE-ACTIVE AGENTS

1946 ◽  
Vol 24f (6) ◽  
pp. 474-493
Author(s):  
R. P. Graham ◽  
W. J. Seagers
Keyword(s):  
Surface Active Agent ◽  
Active Agent ◽  
Direct Dyes ◽  
Equilibrium Sorption ◽  
Bath Concentration ◽  
Surface Active Agents ◽  
Anionic Surface Active Agent ◽  
Surface Active ◽  
Time Required ◽  
Anionic Surface

The presence of an anionic surface-active agent in the dyeing of natural cotton yarn with a purified direct dye, using a dye-bath containing sodium chloride, is shown to increase the rate of dyeing, and to increase the amount of dye sorbed at equilibrium. The rate-accelerating effect has been studied as a function of the concentration of surface-active agent, using both commercial materials and methanol-extractable fractions of the latter. The effect exerted by an anionic surface-active agent, both on the equilibrium sorption and on the rate of dyeing, decreases as the temperature is increased. An explanation of the data, in terms of an interaction between the fibre and surface-active agent, is advanced.Studies carried out in the absence of a surface-active agent show that with increased temperature of dyeing the rate of dye sorption is increased, but the value of the equilibrium sorption is decreased; the dyeing process in exothermic. The relation between equilibrium sorption and residual dye-bath concentration is expressible by a Freundlich equation, and that between equilibrium sorption and initial dye-bath concentration is linear, at least over the range of concentration studied. The time required to reach a state of equilibrium increases as the initial concentration of dye in the bath is increased.

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