Surface and thermodynamic parameters of sodium <i>N</i>‐acyl sarcosinate surfactant solutions

Gad, E. A. M.; El-Sukkary, Mohamed M.; Ismail, Dina A.

doi:10.1007/s11746-997-0117-x

Cited by 65 publications

(41 citation statements)

References 4 publications

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“…The CMC values obtained from the electrical conductivity measurements were higher than those obtained from the surface tension measurements due to the ion pairs formed (16). Increasing the temperature increased the electrical conductivity values when the thermal ionization of the surfactant molecule was increased (18).…”

Section: Resultsmentioning

confidence: 76%

Surface and thermodynamic properties of diquaternary bola‐form amphiphiles containing an aromatic spacer

Negm

Mohamed

2004

J Surfact & Detergents

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A series of diquaternary ammonium bromides having phenyl groups with different (CH 2 /N + ) ratios were synthesized. The critical micelle concentration of each amphiphile was determined using equilibrium surface tension and equivalent conductance data. Air/water interfacial parameters were measured at 20, 35, and 50°C. The surface tension isotherms of the different diquaternary amphiphiles showed two region of discontinuity corresponding to two critical micelle concentrations. The first was related to the spherical nature of the micelles, whereas the second was related to the multiple loops of the lamellar aggregates. The prepared compounds were evaluated as a new class of diquaternary ammonium compounds for future application in protection of steel fabrics against aggressive media (2 N HCl). The results showed that the prepared amphiphiles offered good corrosion inhibition efficiency. Also, increasing the hydrophobic chain length and/or concentration increased their efficiency.In many industrial applications, aqueous solutions are used in various heat transfer systems where water comes in contact with metal surfaces. The drawback stems from the existence of carbon dioxide, sulfur dioxide, or sulfur trioxide contaminants that attack metal surfaces. Organic compounds, especially those containing nitrogen or sulfur, are very good inhibitors of steel corrosion by acids (1,2). Thiourea and most of its derivatives have been described as inhibitors of iron and steel corrosion in acidic solutions (3-5).In a previous study (6), diquaternary bola-form amphiphiles containing saturated chains and spacers were prepared. Physical, surface, and thermodynamic parameters of these amphiphiles were determined, and the surface phenomena of their aggregates were also discussed. In this study, the effect of the unsaturated spacer groups (benzene ring) on the surface and thermodynamic parameters was investigated. These compounds were also evaluated as corrosion inhibitors for steel in extremely acidic environments. MATERIALS AND METHODSSynthesis of dibromodimethylcarbonyl hydroquinone. Hydroquinone (0.1 mol, 11.0 g) (Adwic, Cairo, Egypt) and bromoacetic acid (0.2 mol, 27.8 g) (Aldrich, Milwaukee, WI) were esterified in the presence of p-toluene sulfonic acid (0.001 mol) as a dehydrating agent, in toluene as a solvent, until the azeotropic amount of water was removed (3.6 mL). The product was then dissolved in petroleum ether (60-80°C) to separate the used catalyst, after which the used solvents were then removed in a rotary evaporator under reduced pressure.Synthesis of fatty acid methyldiethanolamine derivatives. Methyldiethanolamine (0.1 mol, 11.9 g) (Aldrich) was esterified by lauric, palmitic, and stearic acids (0.1 mol 20, 25.6, and 28.4 g; Sigma, St. Louis, MO), respectively, in toluene under inert atmosphere (N 2 gas) using p-toluene sulfonic acid (0.001 mol) as a catalyst. After the complete removal of the produced water (0.1 mol, 1.8 mL), the reaction mixture was dissolved in petroleum ether (60-80°C) in a separatory funnel t...

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Section: Resultsmentioning

confidence: 76%

Surface and thermodynamic properties of diquaternary bola‐form amphiphiles containing an aromatic spacer

Negm

Mohamed

2004

J Surfact & Detergents

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“…The maximum surface excess values were used to calculate the average area occupied by single surfactant molecule at water-air interface A min using equation 2 23 .…”

Section: Surface Activitymentioning

confidence: 99%

Synthesis, Surface Properties and Antimicrobial Activity of Some Germanium Nonionic Surfactants

Zaki

Tawfik

2014

J. Oleo Sci.

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“…This is due to the increase in the hydrophobicity of these complexes in comparison to the parent cationics, which is due to the presence of two ligands coordinated to the metal ion [23] , i.e., increase the non polar part. Then the water/surfactant molecules interactions increased, which forced them to the air-water interface [24]. so, the surface tension decreased.…”

Section: Surface Properties: 321 Surface Tensionmentioning

confidence: 99%

Synthesis and Biological Activity of Some Amide-Based Cationic Surfactant complexes with Co (II) and Cu (II)

Adawy¹,

Badr²

2014

IOSRJAC

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Surface and thermodynamic parameters of sodium N‐acyl sarcosinate surfactant solutions

Cited by 65 publications

References 4 publications

Surface and thermodynamic properties of diquaternary bola‐form amphiphiles containing an aromatic spacer

Surface and thermodynamic properties of diquaternary bola‐form amphiphiles containing an aromatic spacer

Synthesis, Surface Properties and Antimicrobial Activity of Some Germanium Nonionic Surfactants

Synthesis and Biological Activity of Some Amide-Based Cationic Surfactant complexes with Co (II) and Cu (II)

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