Synthesis and evaluation of nonionic surfactants based on dimethylaminoethylamine: Electrochemical investigation and theoretical modeling as inhibitors during electropolishing in-ortho-phosphoric acid

Taha, A.A.; Shaban, Samy M.; Fetouh, H. A.; Taha, Salma T.; Sabet, V.M.; Kim, Dong Hwan

doi:10.1016/j.molliq.2021.115421

Cited by 26 publications

(21 citation statements)

References 113 publications

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“…Whether it was surface adsorption or micellization, the hydrophilic head was in direct contact with water, whereas the hydrophobic tail was out of touch with the aqueous solution. Such behavior should cause the free energy to release and as well the C cmc value to decrease. , It could be clearly seen from the data in Table that the γ cmc value showed a slight decrease trend with the increase of the alkyl chain length ( n = 7 → 16, γ cmc = 28.91 → 28.52 mN m –1 ). This should be attributed to the fact that long-chain β- d -glucopyranosides were more easily adsorbed on the surface.…”

Section: Results and Discussionmentioning

confidence: 95%

“…From the response data obtained above, the corresponding γ-ln C curve was plotted to acquire the critical micelle concentration ( C cmc ) and the related surface tension at CMC (γ cmc ). The surface excess (Γ max ) of the single-layer saturated adsorption was calculated by the Gibbs eq (eq ), and the average minimum area ( A min ) of each adsorbed molecule at the air/solution interface could be obtained from eq : , where n = 1, T was the thermodynamic temperature (K), R is the gas constant ( R = 8.314 J mol –1 K –1 ), and d γ/ d ln C was the slope of the surface tension curve. Where N A was the Avogadro number (6.02 × 10 23 ).…”

Section: Methodsmentioning

confidence: 99%

“…Where N A was the Avogadro number (6.02 × 10 23 ). In addition, the effectiveness of reducing surface tension (π cmc ) could be calculated by the formula (eq ), and the adsorption efficiency of reducing surface tension (pC 20 ) could be obtained by the formula (eq ): Herein, γ 0 was the surface tension of distilled water (71.97 mN m –1 ), and C 20 was the molar concentration of the surfactant ( 4a – 4f ) solution when the related surface tension of water decreased by 20 mN m –1 . The greater the pC 20 value, the higher the adsorption efficiency of surfactants.…”

Section: Methodsmentioning

confidence: 99%

“…From the response data obtained above, the corresponding γln C curve was plotted to acquire the critical micelle concentration (C cmc ) and the related surface tension at CMC (γ cmc ). The surface excess (Γ max ) of the single-layer saturated adsorption was calculated by the Gibbs eq (eq 4), 33 and the average minimum area (A min ) of each adsorbed molecule at the air/solution interface could be obtained from eq 5: 33,41…”

Section: Methodsmentioning

confidence: 99%

“…Where N A was the Avogadro number (6.02 × 10 23 ). In addition, the effectiveness of reducing surface tension (π cmc ) could be calculated by the formula (eq 6), 41 and the adsorption efficiency of reducing surface tension (pC 20 ) could be obtained by the formula (eq 7): 33…”

Section: Methodsmentioning

confidence: 99%

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Surface Properties and Liquid Crystal Properties of Alkyltetra(oxyethyl) β-d-Glucopyranoside

Zhang

Chen

et al. 2021

J. Agric. Food Chem.

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Hydrophilic alkyl polyglycosides (APGs) and alkyl glycosides (AGs) with anomeric pure are a class of important substitutes for petroleum-based surfactants. Improving their water solubility should make such hydrophilic glycosurfactants have more excellent potential application value. To solve the inherent problem of poor water solubility of traditional alkyl β-Dglucopyranoside (5), a series of alkyltetra(oxyethyl) β-D-glucopyranosides (4a−4g, n = 7−18) were successfully synthesized by introducing tetra(oxyethylene) fragments to carry out the structural modification. The relationship between the related structure and the physicochemical properties was further investigated, including their hydrophilic−lipophilic balance (HLB), water-solubility, foaming performance, emulsification, hygroscopicity, surface activity, and thermotropic/lyotropic liquid crystal phase behavior. The results showed that the water solubility gradually decreased as the alkyl chain length increased due to the gradual decrease of their HLB number. Octadecyltetra(oxyethyl) β-D-glucopyranoside (4g, n = 18) was found to be insoluble in water at 25 °C. Taken together, long-chain alkyl glycosides had good foaming properties and excellent emulsifying properties. Among them, dodecyltetra(oxyethyl) β-D-glucopyranoside (4d, n = 12) had the best foaming performance. In the rapeseed oil/water system, cetyltetra(oxyethyl) β-D-glucopyranoside (4f, n = 16) had the best emulsifying ability. With the increase of the alkyl chain length, the critical micelle concentration (C cmc ), γ cmc , Γ max , and hygroscopicity of this series of glycosides showed a downward trend. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) showed that the thermal stability increased with the increase of the alkyl chain length, and alkyltetra(oxyethyl) β-D-glucopyranosides (4d−4g, n = 12−18) had the corresponding melting points and clearing points. Alkyltetra(oxyethyl) β-D-glucopyranosides (4b−4g, n = 8−18) formed a smectic phase with a typical fan-shaped and focal conic texture during the cooling process. In the water contact experiments, it was found that glycosides (4b−4g, n = 8−18) at high concentrations transformed into various lyotropic liquid crystal including hexagonal phase, bicontinuous cubic phase, and lamellar phase phases. Therefore, such green nonionic glycosurfactants alkyltetra(oxyethyl) β-D-glucopyranosides should have potential practical application prospects.

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Section: Results and Discussionmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Surface Properties and Liquid Crystal Properties of Alkyltetra(oxyethyl) β-d-Glucopyranoside

Zhang

Chen

et al. 2021

J. Agric. Food Chem.

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Synthesis and Characterization of Nicotinonitrile Derivatives as Efficient Corrosion Inhibitors for Acid Pickling of Brass Alloy in Nitric Acid

et al. 2022

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Three nitrogen-heterocyclic nicotinonitriles compounds 4, 6dimethyl-2-(methylamino)-nicotinonitrile 3; 2-(dimethylamino)-4, 6-dimethyl-nicotinonitrile 4, 2-((3-bromophenyl)-amino)-4, 6dimethyl-nicotinonitrile 5 are prepared and characterized by Fourier transformer infra-red spectroscopy, proton nuclear magnetic resonance, mass spectrometry and elemental analysis. Novelty of study is synthesis and evaluation of new series organic compounds of related chemical structures as corrosion inhibitors acid pickling of brass alloy by nitric acid. Compound 5 is prepared for the first time. Compounds 3-5 are potent biocides and efficient corrosion inhibitors for brass alloy. Inhibition efficiency 94 %, 95 %, 96 % are achieved at 180 ppm compounds 3-5, respectively. Inhibition efficiency followed the order: compound 5 > 4 > 3. For compound 5, increase charge transfer resistance and decrease in capacitance of electrical double layer confirmed adsorption mechanism. Limiting current indicated that corrosion is controlled by mass transfer of oxygen toward metal surface. Inhibition efficiency followed quantitative structure activity relationships. For the same molecular chemical structure of nicotinonitriles compounds 3-5, Substituents methylamino, dimethylamino and 3-bromophenylamino increased inhibition efficiency following the order: 3-Br-C 6 H 4 NH > (CH 3 ) 2 N > CH 3 NH.

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New and innovative microwave-assisted technology for synthesis of guar gum-grafted acrylamide hydrogel superabsorbent for the removal of acid red 8 dye from industrial wastewater

et al. 2022

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The goal of this study is to develop a new effective guar gum-grafted acrylamide hydrogel for wastewater treatment, abbreviated as (guar gum-g-acrylamide). For the non-biodegradable and hazardous synthetic acid red 8, the produced guar gum-g-acrylamide hydrogel is a promising thermally stable adsorbent. Microwave-aided technique, ammonium persulfate initiator, and N,N′-methylene-bis-acrylamide cross-linker are used to make a hydrogel comprising natural polysaccharides guar gum grafted by poly acrylamide. Fourier transformer infrared (FTIR) spectra and scanning electron microscopy (SEM) demonstrate that varied percentages of acrylamide successfully graft the backbone of guar gum. When the grafting percentage of acrylamide is raised, the hydrogel’s maximum adsorption capacity (qe) increases. At pH 1 of dye solution, maximum adsorption capacity (qe) is 18 mg.g−1, at pH 9; qe is decreased up to 8 mg.g−1. At 0.5 g.L−1 hydrogel, the dye has a low removal percentage (34%), but when the hydrogel dosage is increased to 8 g.L−1, the removal percentage increases to 90%. When the initial AR8 dye concentration was increased from 50 to 300 mg.L−1, the removal percentage reduced to 20% and the adsorbed quantity dye increased from 17 to 44 mg.g−1, but both parameters became limited above this dye concentration. Other ideal conditions for AR8 dye removal by the hydrogel include 60 min of contact time, 150 revolutions per minute (rpm), and a temperature of 20 degrees Celsius. The AR8 dye adsorption kinetic is pseudo-second order, assuming electrostatic interaction between the negatively charged AR8 dye molecules and the positively charged hydrogel-functional group. The adsorption values fit the Langmuir isotherm, with qmax. of 54.054 mg.g−1. The adsorbed quantity (qe) decreases as the temperature rises, indicating that dye molecules physisorbed on the hydrogel pores, and the maximum adsorption capacity is at 20 °C. The exothermic and spontaneity of adsorption were confirmed by the negative values of heat of adsorption (∆H°ads.) and standard Gibbs free energy of adsorption (∆G°ads.). The reusability of the hydrogel was validated after three cycles of desorption of AR8 dye from the hydrogel surface in alkaline solution.

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Synthesis and evaluation of nonionic surfactants based on dimethylaminoethylamine: Electrochemical investigation and theoretical modeling as inhibitors during electropolishing in-ortho-phosphoric acid

Cited by 26 publications

References 113 publications

Surface Properties and Liquid Crystal Properties of Alkyltetra(oxyethyl) β-d-Glucopyranoside

Surface Properties and Liquid Crystal Properties of Alkyltetra(oxyethyl) β-d-Glucopyranoside

Synthesis and Characterization of Nicotinonitrile Derivatives as Efficient Corrosion Inhibitors for Acid Pickling of Brass Alloy in Nitric Acid

New and innovative microwave-assisted technology for synthesis of guar gum-grafted acrylamide hydrogel superabsorbent for the removal of acid red 8 dye from industrial wastewater

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