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Abstract In the present work, a series of newly Gemini cationic surfactants were prepared. The prepared cationic surfactants named as followed: (E)-2-(2-((4-(2-(bis(2-hydroxyethyl)(2-(octanoyloxy)ethyl) ammonio)acetoxy)-3-ethoxybenzylidene)amino)ethoxy)-N,N-bis (2-hydroxyethyl)-N-(2-(octanoyloxy)ethyl)-2-oxoethanaminium chloride hydrate (E)-N-(2-(dodecanoyloxy)ethyl)-2-(2-((4-(2-((2-(dodecanoyloxy) ethyl)bis(2-hydroxyethyl)ammonio)acetoxy)-3-methoxybenzylidene) amino)ethoxy)-N-ethyl-N-(2-hydroxyethyl)-2-oxoethanaminium chloride (E)-2-(2-((4-(2-(bis(2-hydroxyethyl)(2-(palmitoyloxy)ethyl) ammonio)acetoxy)-3-methoxybenzylidene) amino)ethoxy)-N-ethyl-N- (2-hydroxyethyl)-2-oxo-N-(2-(palmitoyloxy)ethyl)ethanaminium chloride This work contains three chapters:- Chapter 1: Introduction An introduction about surfactants (Definition, classification and applications), an introduction about corrosion (Definition, forms, types and protection from corrosion), and this chapter include the aim of this work. Chapter 2: Materials and Experimental Techniques The experimental part includes complete description of synthesis of inhibitors, as following: 1. Synthesis of new Gemini surfactants; the desired Gemini cationic surfactants was prepared through three main steps; a. the first step is a Schiff base formation by reaction equimolar from vanillin was refluxed with monoethanolamine in 100 ethanolic solution for 6 hrs to produce compound 3.The obtained schiff base 3 was esterified with chloroacetic acid in 100 mL xylene as solvent in the presence of the catalyst 0.01% p-toluene sulphonic acid was added to the reaction mixture and the reaction completed by removal of the desired water amount (1.8 ml) using Dean-Stark system. The xylene was evaporated and the petroleum ether used to remove the catalyst from the product 5. b. The second step is reaction equimolar from the different fatty acid (octanoic acid, dodecanoic acid and hexadecanoic acid) separately which esterified with triethanolamine in the presence of the catalyst 0.01% p-toluene sulphonic acid was added to the reaction mixture and the reaction completed by removal of the desired water amount (1.8 ml) using Dean-Stark system. The xylene was evaporated and the petroleum ether used to remove the catalyst from the product to produce the corresponding hydroxyl ester compounds 10, 11 and 12. c. The third step, the obtained dichloro ester 5 was refluxed with hydroxyl ester compounds 10,11 and 12 in the presence of ethyl alcohol as solvent for 48 hrs the di ethyl ether used to recrystallization after evaporating the solvent the and further purification the final synthesized Gemini cationic surfactant were labeled as CMTC, LMTC and PMTC. 2. Confirmation the chemical structure of prepared cationic surfactants using FTIR and 1HNMR spectroscopes. 3. Description of corrosion tests which used to evaluate the inhibition efficiency of the used inhibitors for carbon steel corrosion in 1.0 M HCl. 4. Description of surface measurement and calculation the surface and thermodynamics parameters of adsorption and micellization. 5. Description the methods used to evaluate the prepared cationic surfactants as biocide against pathogenic bacteria and pathogenic fungi. |