Abstract

Synthesis of selected Gemini Surfactants: Surface, biological activity and corrosion efficiency against hydrochloric acid medium

In this paper, a family of novel Gemini surfactants from mono alkyl glycerol ether with different
hydrophobe lengths (C12, C18) and different spacers as ethylene glycol, hydroquinol, N,N,N\,N\,
tetramethylene diamine and sodium-bis-N,N(carboxymethyl) ethylene diamine were synthesized
on a laboratory scale. The compounds were characterized by elemental analysis and
spectroscopic data. Surface tension measurements were used to determine the critical micellar
concentration (cmc), the maximum surface excess concentration (Gmax), minimum area per
molecule (Amin.) at air/water interface, Gibb’s free energy of adsorption (DGads) and other
parameters.The inhibition of dimeric surfactants on the corrosion of carbon steel (CS) in (1M)
HCl was studied at 25°C by weight loss. The obtained results showed that the prepared gemini
compounds are excellent. The antimicrobial activity of dimeric compounds were tested against
Gram-positive bacteria, Gram-negative bacteria and fungi. Dimeric surfactants are very
attractive for catalysis and adsorption applications, biotechnology, enhanced oil recovery and as paint additive.


Author(s): B.M. El-Sadek

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