In the present work, Ag nanoparticles were added to polyurea coating in order to improve its antibacterial and electrochemical properties in sulfide-reducing bacteria-containing media. To this end, Ag nano-powder was mixed with two component polyuria, and then the antibacterial behavior of the nanocomposite coating was studied in sulfate-reducing bacteria (SRB)-containing medium. The results revealed the inhibitory effects of nanocomposite coating on the formation of SRB biofilms on the samples. Moreover, the SRB population decreased in contact with the Ag nanoparticles-mixed coating over 7 days. Investigation of the growth and activity of the bacteria represented the effective antibacterial properties of Ag nanoparticles in the polyurea matrix. Furthermore, EIS (electrochemical impedance spectroscopy) measurements indicated that the corrosion properties of the nanocomposite coating improved considerably over 7 days. The coating resistance increased 2 times by adding Ag nanoparticles after 1 day and 3.3 times after 7 days. In accordance with the same results, the charge transfer resistance increased 1.5 times and 1.1 times by adding Ag nanoparticles after 1 day and 7 days, respectively. The improvement in the protective properties of the nanocomposite coating are reflected in the increase in both film and charge transfer resistance.
Background and aims: With the epidemic of the COVID-19 virus and the increasing development of information and communication technology, an opportunity has emerged for medical and therapeutic service providers to develop telemedicine services. In the current research, the authors tried to explain people's turn to this technology by expanding the Unified Theory of Use and Acceptance of Technology 2 (UTAUT2) and adding the features of telemedicine services.
Methods:The current research is applied from the point of view of the objective, and in terms of data collection, it is considered to be descriptive research, which is carried out by the correlation-causal method. The data collection tool is a standard questionnaire with a Likert scale, distributed by available sampling among the population with a history of using telemedicine services in Ahvaz city. Finally, 407 usable questionnaires were analyzed using SPSS and Smart PLS.
Results:The results show that performance expectancy, effort expectancy, facilitating conditions, hedonic motivation, perceived product advantage, and perceived security have a significant and positive effect on the intention to use telemedicine. Moreover, the moderating role of innovativeness and gender was confirmed.
Conclusion:UTAUT2 and some characteristics of telemedicine services can well explain the intention to use this technology in the context of COVID -19. In addition, considering the moderating role of personal innovation and gender in some relationships between the model and product features confirmed, it is necessary to pay attention to the individual characteristics of people using these technological services in the design of telemedicine services.
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