Synthesis, characterization, surface and biocidal effect of some germinate nonionic surfactants

Zaky, Mohamed F.; Aiad, Ismail; Tawfik, Salah M.

doi:10.1016/j.jiec.2014.05.031

Cited by 27 publications

(9 citation statements)

References 42 publications

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“…Furthermore, the highest biodegradation extent was obtained in case of VE40 and VE60 at 82 and 89 % compared to VE15 and VE20 surfactants at 70 and 78 %, respectively. As concluded from the biodegradation ratios, the values meets the international recommendation of the biodegradable surfactants in drain water which is 75 % after 28 days [64]. It is clear that there is a direct relationship between the number of attached OE units and the percent of biodegradation.…”

Section: Biodegradabilitysupporting

confidence: 61%

Vanillin-derived non-ionic surfactants as green corrosion inhibitors for carbon steel in acidic environments

Tawfik

Negm

2015

Res Chem Intermed

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Four eco-friendly ('green') non-ionic surface active agents were synthesized via reaction of fatty acids obtained from hydrolysis of castor oil with vanillin. The products were then reacted with monoethanol amine to form a vanillin ester Schiff base. The vanillin ester Schiff base was ethoxylated using ethylene oxide gas in the presence of tri-ethyl amine as a catalyst to give the desired nonionic surfactants. The chemical structures of the obtained surfactants were characterized using FTIR and 1 HNMR spectroscopy. The inhibition effect of the four synthesized non-ionic surfactants derived from vanillin (VE15, VE20, VE40, and VE60) on the corrosion of carbon steel in acidic media of 0.5-M HCl was studied by weight loss, potentiodynamic and electrochemical impedance spectroscopy measurements. The results show that the synthesized inhibitors are effective inhibitors even at very low concentrations, and the adsorption on carbon steel surface obeys the Langmuir adsorption isotherm. Potentiodynamic polarization curves reveal that the synthesized inhibitors behave as mixed-type inhibitors. Adsorption of used inhibitors led to a reduction in the double layer capacitance and an increase in the charge transfer resistance. Calculated DG ads o values indicated that the mechanism by which these inhibitors adsorb onto carbon steel in 0.5-M HCl solution is chemical adsorption. The surface activities of the synthesized surfactants were determined using surface tension measurements. The biodegradability of these surfactants indicates that the compounds readily degrade in the environment and can be considered as green corrosion inhibitors.

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Section: Biodegradabilitysupporting

confidence: 61%

Vanillin-derived non-ionic surfactants as green corrosion inhibitors for carbon steel in acidic environments

Tawfik

Negm

2015

Res Chem Intermed

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“…In Gram-positive bacteria there is a thick layer of peptidoglycan, teichoic and lipoteichoic acids, which may serve as chelating agents. According to literature data the lipoteichoic acid layer may participate in the adsorption of positively charged molecules [36]. The higher resistance displayed by Gram-negative bacteria could be explained by the presence of an external membrane in the cell wall structure, composed of lipopolysaccharides and proteins.…”

Section: Discussionmentioning

confidence: 99%

Surface and Antimicrobial Activity of Sulfobetaines

Wieczorek

Gwiazdowska

Staszak

et al. 2016

J Surfact & Detergents

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Sulfobetaines belong to the group of zwitterionic surfactants. They are electroneutral salts, which have in the same molecule, two ionic centers with different charge. Due to the specific structure they exhibit excellent properties such as good solubility in water and detergency. In this paper we present surface properties and adsorption parameters of sulfobetaines in water/air systems. From the adsorption isotherms the CMC value, the surface tension and surface pressure at the CMC as well as the efficiency of adsorption were determined. Physicochemical analyses of the data allowed for the further description of adsorption process. Results showed that sulfobetaines exhibit good surface properties especially low CMC and p20 values. Additionally the antimicrobial activity of sulfobetaines solutions against gram‐positive and gram‐negative bacteria were tested by the well‐diffusion method. MIC values and growth kinetics were determined by microdilution method. Antimicrobial assays demonstrated that sulfobetaines can be good antibacterial agents, but the activity of surfactants strongly depends on alkyl chain length.

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“…Surfactants have a good antimicrobial activity against pathogenic bacteria and fungi as reported by several researchers [22][23][24][25][26][27][28][29][30]. These types of ionic liquids have significant toxic effects on pathogenic bacteria and fungi.…”

Section: Introductionmentioning

confidence: 89%

Synthesis, characterization, surface and biocidal effect of some germinate nonionic surfactants

Cited by 27 publications

References 42 publications

Vanillin-derived non-ionic surfactants as green corrosion inhibitors for carbon steel in acidic environments

Vanillin-derived non-ionic surfactants as green corrosion inhibitors for carbon steel in acidic environments

Surface and Antimicrobial Activity of Sulfobetaines

Simple one step synthesis of gemini cationic surfactant-based ionic liquids: Physicochemical, surface properties and biological activity

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