الفهرس 
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Abstract
surfactants.
1- The monoquaternary Schiff base surfactants were prepared by reacting m-aminopyridine and different fatty esters of ketoglutaric acid to produce the dialkyl monoSchiff bases. Then the Schiff bases were quaternized by ethyl iodide
2- The diquaternary dischiff base cationic surfactant was prepared by coupling of m-aminopyridine and acetyl acetone in (2:1) molar ratio then the obtained dischiff base was quaternized by excess of ethyl iodide .
3- The diquaternary surfactant was loaded on silver nano particle to obtain the nano-sized diquaternary surfactant by the reduction method to prepare the silver nanoparticles.
4- The prepared cationic surfactants were complexed with transition metals; namely (Cu, Co, Ni, and Mn) to obtain the different metal complexes. (20-Compounds). 5- All the chemical structures of 25- compounds (not nano sized diquaternary) were investigated by using:-
A- Elemental analysis:- which showed the high purity of the prepared compounds.
B- Infrared spectroscopy: - which showed the identical function groups in the chemical structure as represented in the different schemes.
C- Proton nuclear magnetic resonance (¹ HNMR):-which showed the distribution of the protons in the chemical structure as expected.
6- The surface activity of the prepared compounds determined by using surface tension, Interfacial tension measurements, Emulsification power and Partition coefficient values. the surface activity measurements showed the good activity of the data of critical micelle concentration .effectiveness, efficiency, maximum surface excess and minimum surface area the surface activity of the compounds were confirmed by the thermodynamic data, e.g., standard fee energy changes of adsorption and micellization.
7- The prepared cationic monoquaternary surfactants were applied as corrosion inhibitors used.
8- The synthesized cationic surfactants and their metal complexes, in addition to the loaded silver nanoparticles of the diquaternary surfactant were evaluated as biocides against different bacterial fungi a vital role in the antimicrobial activity. 12- The loaded silver nanoparticles of the diquaternary dischiff base showed extremely increase in the antimicrobial activity than the parent diquaternary dischiff base. Finley