Greetings,
I am currently studying the properties of urea-formaldehyde microcapsules. I found that a few journal has mentioned that urea-formaldehyde microcapsule is pH-sensitive. But, I also have read that the pH-sensitive property depends on the core material. The issue is very important since I want to test in out on corrosion application. If the shell wall made of urea-formaldehyde is indeed pH sensitive then it is quite essential for me to clarify before I begin the lab works. Please, can someone clarify this? Thank you so much
Dear Dr. Wan Mohamad Ikhmal ,
generally the microcapsules are the "sensitive container" of protective agents / inhibitors that are released from the system at suitable pH values in order to protect the metal substrate.
Generally in fact, the microcapsules are contained in a certain quantity in the coating (eg epoxy resin) that is applied to the substrate and can provide better protection of the same.
For steels, this solution seems to work….
For more details, please see the following, interesting papers:
-Robust polyurea/poly(urea–formaldehyde) hybrid microcapsules decorated with Al2O3 nano-shell for improved self-healing performance
Fang Wu, Junfeng Li, Heng Quan, Jiang Han, Xiaoxuan Liu, Xiaokun Zhang, Jinglei Yang, Yong Xiang
Applied Surface Science, Vol. 542, 148561 (2021).
Available, as full text, at: https://www.sciencedirect.com/science/article/abs/pii/S0169433220333195?dgcid=rss_sd_all#!
-pH-sensitive microcapsules based on biopolymers for active corrosion protection of carbon steel at different pH
Ana Beatriz Marques da Cunha, Debora Abrantes Leal, Luzia Rejane Lisbôa Santos, Izabel Cristina Riegel-Vidotti, Cláudia E. B. Marino
Surface and Coatings Technology, 402:126338 (2020)
Available, as abstract, in RG at: https://www.researchgate.net/publication/343789613_pH-sensitive_microcapsules_based_on_biopolymers_for_active_corrosion_protection_of_carbon_steel_at_different_pH
-Synthesis and properties of polyelectrolyte multilayered microcapsules reinforced smart coatings
Adnan Khan, Fareeha Ubaid, Eman M. Fayyad, Zubair Ahmad, R. A. Shakoor, M. F. Montemor, Ramazan Kahraman, Said Mansour, Mohammad K. Hassan, Anwarul Hasan & Aboubakr M. Abdullah
Journal of Materials Science, Vol. 54, pages 12079–12094 (2019)
Available, as full text, at: https://link.springer.com/article/10.1007/s10853-019-03761-9
Good research and my best regards, Pierluigi Traverso (CNR-IAS-Genoa).
Dear Wan Mohamad Ikhmal
Yes you are right in your query as the urea-formaldehyde microcapsule is pH-sensitive during formation stage as the pH value playing considerable role in deciding the final chemical shell structure. Now, during its applications, the parameters that controlling the rate of release are types of material and thickness of the microcapsule shell but not pH.
Best regards
Thank you for the clarification Dr. Mohammed Hussein j. H. Al'Atia :)
Thank you for the clarification Dr. Mohammed Hussein j. H. Al'Atia :)
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