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21 results on '"Kordas, George"'

5. Contributors

Author

Ali, M. Yusuf, primary, Aminudin, Nurul Iman, additional, Basit, Abdul, additional, Başkor, Atakan, additional, Beetel, Robert J., additional, Behgounia, Farahnaz, additional, Buket Aksu, N., additional, Camci-Unal, Gulden, additional, Chakraborty, Subhodeep, additional, Chaudhary, Shivang, additional, Chen-Mayfield, Ting-Jing, additional, Chettipally, Uli, additional, Chokshi, Nirav, additional, Danial, Wan Hazman, additional, Dash, Rajesh, additional, Dharamsi, Abhay, additional, Elangovan, Venkateswaran R., additional, Elhag, Ibtihag Yahya, additional, Faiyazuddin, Md., additional, Ferguson, Jalisa Holmes, additional, Gaikwad, Vinod, additional, Hamzah, Nurasyikin, additional, Hathout, Rania M., additional, Hu, Quanyin, additional, Ismail, Mohamad Wafiuddin, additional, Jambhekar, Sunil S., additional, Kannan, Shantani, additional, Karacaoglu, Beyza, additional, Kordas, George, additional, Kulkarni, Vineet R., additional, Li, Zhaoting, additional, Loganathan, Sivakumar, additional, Madheswaran, Thiagarajan, additional, Maniruzzaman, Mohammed, additional, Manzano, Toni, additional, Md Ali, Mohd Adli, additional, Mesut, Burcu, additional, Metwally, Abdelkader A., additional, Ming, Yang, additional, Mohammadipanah, Fatemeh, additional, Muthudoss, Prakash, additional, Naeem, Abid, additional, Navale, Archana Mohit, additional, Paliwal, Himanshu, additional, Paudel, Amrit, additional, Philip, Anil K., additional, Pillai, Amit Raviraj, additional, Piroozmand, Firoozeh, additional, Prajapati, Bhupendra G., additional, Prajapati, Dhvanil N., additional, Prajapati, Jigna B., additional, Qin, Zheng, additional, Ramli, Muhammad Zahir, additional, Saikia, Surovi, additional, Sajedi, Hedieh, additional, Seydibeyoğlu, Mehmet Özgür, additional, Shafiee, Saiful Arifin, additional, Shahiwala, Aliasgar, additional, Shankar, Sushant, additional, Siddiqui, Shahid S., additional, Subbaram, Kannan, additional, Suhail, Muhammad, additional, Susanti, Deny, additional, Taher, Muhammad, additional, Thakkar, Rishi, additional, Ulucan-Karnak, Fulden, additional, Wang, Yixin, additional, Whitford, William, additional, Xia, Zhang Ming, additional, Yali, Liu, additional, Zingales, Sarah Kathryn, additional, and Zohuri, Bahman, additional

Published
2023
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19. Self-Healing of Concrete through Ceramic Nanocontainers Loaded with Corrosion Inhibitors and Microorganisms

Author

Kordas, George

Subjects
Technology & Engineering / Materials Science
Abstract

Self-healing was considered for repairing of destruction of reinforced concrete on bridges, houses, etc., that comes from corrosion of reinforcement metals as well as cracking in cement. The work was accomplished at producing and assessing through incorporate ceramic nanocontainers loaded with microorganisms. We produced various types of organic and inorganic nanocontainers that were incorporated into the cement that can act as carriers for the transport of bacteria. The microorganisms used in the work are Escherichia coli and Staphylococcus aureus. Precipitation of CaCO3 was observed by both bacteria. As microspheres do not affect the submersion of the mineral by the microorganism, additional studies were carried out to assess the interaction between transmission microsystems and bacterium. The mechanism of self-healing of building materials in this work was based on CaCO3 precipitation, through the ureolytic action of bacteria. When a crack appears in the cement, then the bacterium trapped in a nanocontainers is released and comes into contact with the water. In this way, the microorganism begins to metabolize and precipitate the mineral, in a way that eventually observes healing of the crack. CaCO3 microbial precipitation was based on the breakdown of urea (CO (NH2)2) into CO32− and NH3. Due to the high pK value of the NH3/NH4+ system (pKa = 9.2), the breakdown reaction led to an increase in pH, favoring the release of carbonated ions (CO32−), and in an environment rich in calcium ions (Ca2+), CaCO3 precipitation took place.

Published
2022

21. ORMOSIL Coatings Enriched with CeO 2 (5-ATDT)-Ceramic Nanocontainers for Enhanced Protection of HDG Steel Used in Concrete.

Author

Kordas, George

Subjects
*CERIUM oxides, *SURFACE coatings, *STEEL, *CONCRETE, *ZINC
Abstract

This paper reports developing an innovative method of anticorrosion protection based on organically modified silica (ORMOSIL) enriched with CeO2 ceramic nanocontainers loaded with 5-amino-1, 3, 4-thiadiazole-2-thiol (5-ATDT) on hot-dip galvanized zinc (HDG) steel used to strengthen cement in concrete. The chemistry of ORMOSIL coatings and the production of CeO2 ceramic nanocontainers are described in detail for reproduction by other researchers. The anticorrosion properties of these novel coatings were investigated through frequency response analysis (FRA). As a result, the coatings HDG-ORMOSIL + CeO2 (5-ATDT) were better than the samples of HDG steel, HDG-ORMOSIL, and HDG-ORMOSIL + CeO2 (EMPTY) by a factor of 1033.60, 109.21, and 7.76 in terms of anticorrosion protection, respectively. [ABSTRACT FROM AUTHOR]

Published
2022
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