ABSTRACT
A series of 4-ferrcenylbutyl carboxylate esters with different alkyl chain length (C2-C4) of carboxylic acids were synthesized using Fe3O4@SiO2@(CH2)3-Im-bisEthylFc[I] nanoparticles as catalyst and have been characterized with FT-IR, 1H NMR, and 13C NMR. Ferrocenyl-based esters were used as corrosion inhibitors of mild steel in the 1M HCl solution as corrosive media. The corrosion inhibition efficiency of the synthesized ferrocenyl-based esters has been assessed by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The 4-ferrocenylbutyl propionate showed a more effective corrosion inhibition behavior among the studied esters with 96% efficiency after immersion in the corrosive media for 2 weeks. The corrosion inhibition mechanism is dominated by formation of passive layer of inhibitor on the surface of the mild steel by adsorption. Moreover, the adsorption characteristics of 4-butylferrcenyl carboxylate esters on mild steel were thoroughly explored using density functional theory calculations. It was found that the Fe atoms located around the C impurity in the mild steel are the most efficient and active sites to adsorb 4-butylferrcenyl carboxylate esters.
ABSTRACT
OBJECTIVES: Quality of sleep (QoS) in individuals is affected by their occupation and is one of the factors affecting the quality of life (QoL). Few studies have evaluated the relationship between QoS and QoL in military women personnel. The aim of this study was to assess QoL and QoS, and compare their relationship among military and non-military women in Tehran. METHODS: This cross-sectional study was carried out on 90 women working in Tehran during 2014, 30 were military forces, 30 were military staff, and 30 were civilian organizations staff. The female subjects were selected from Amin Police University and Tehran Health Insurance Organization using simple random sampling. The 36-Item Short Form Health Survey (SF-36) and Pittsburgh Sleep Quality Index (PSQI) were used to measure QoL and QoS, respectively. The relationship between QoL and QoS was assessed using Pearson's correlation coefficient. RESULTS: The mean scores of QoL in the military forces, military staff, and civilian organizations staff were 58.94±17.71, 67.18±13.52, and 69.10±12.51, respectively. Among the study participants, 62.9% of military forces, 20.0% of military staff, and 17.1% of the civilian organizations staff had poor QoS. Mental health as one of the dimensions of QoL was significantly different between military forces and civilian organizations staff. The association between QoL and QoS was statistically significant in military forces and military staff women. CONCLUSIONS: Low QoS and QoL in the army necessitates that the authorities offer programs and appropriate strategies to improve mental health of QoL and promotion of QoS.
