Preparation and evaluation of some novel liquid crystals as antioxidants

Studies On Some Thiazolidinones As Antioxidants For Local Base Oil

“…Temperatures can range from ambient for transformers to over 300°C in the sump of a modern car engine. Under such conditions and in the presence of many metals, the mineral oil will undergo a series of oxidative chemical reactions leading to an increase in viscosity and acidity, which lead to the corrosion of metal parts and the formation of carbonaceous deposits [2], Therefore that reduces the efficiency of the system [3]. Usually, lubricating oils operate at higher severities of temperatures and pressure; therefore it is required to improve thermal and oxidative stability and excellent temperatureviscosity characteristics allowing the oil to meet the demanding requirements for use in industrial application [4].…”

Green Synthesis of a Novel Cationic Surfactant Based on an Azo Schiff Compound for Use as a Carbon Steel Anticorrosion Agent

“…First, the azo compound (azoS8) involves a two-step process: first, p -toluidine is diazotized with a nitrous acid source to form a diazonium salt. In the second step, this diazonium salt is coupled with an aniline compound under suitable conditions to yield the desired ( E )-4-( p -tolyldiazenyl)­aniline; this method is described in the literature . In the second step, the surfactant N , N -dimethyl- N -octyl-4-(( E )-((4-(( E )- p -tolyldiazenyl)­phenyl)­imino)­methyl)­benzenaminium bromide was synthesized by heating 1-bromooctane with an equal amount of 4-(dimethylamino)­benzaldehyde in absolute ethanol, in a 1:1 molar ratio.…”

“…In the second step, this diazonium salt is coupled with an aniline compound under suitable conditions to yield the desired (E)-4-(p-tolyldiazenyl)aniline; this method is described in the literature. 29 In the second step, the surfactant N,N-dimethyl-N-octyl- 4-((E)-((4-((E)-ptolyldiazenyl)phenyl)imino)methyl)benzenaminium bromide was synthesized by heating 1-bromooctane with an equal amount of 4-(dimethylamino)benzaldehyde in absolute ethanol, in a 1:1 molar ratio. The reactants were refluxed for 12 h. Following that, the reaction mixture was cooled to ambient temperature.…”

Chemical and Electrochemical Investigation of a Novel Liquid Crystal as an Anticorrosion Agent for Mild Steel in Acidic Media

“…In the second step,a condensation reaction between 4-formyl-N,Ndimethyl-N-octylbenzenaminium bromide (4.28 gm) and 4-iodoaniline (2.74 gm ) in the molar ratio of (1:1) was performed for 12 h under reflux in 250 ml ethanol. After that, the product was recrystallized from ethanol to produce I-N-C8 [16,17].…”