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Metal Electrodeposition From Deep Eutectic Solvents
Başlık:
Metal Electrodeposition From Deep Eutectic Solvents
Yazar:
Pereira, Nuno Miguel Oliveira, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (188 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-09C.
Özet:
Due to their properties, deep eutectic solvents have attracted the attention of the scientific community as possible alternative of the aqueous electrolytes for metal deposition.
This thesis presents experimental results regarding the metal electrodeposition form the deep eutectic solvents 1:2 choline chloride:ethylene glycol (ChCl-EG) and 1:2 choline chloride:urea (ChCl-U). Additionally the metal concentration and the presence of additives was also evaluated.
The electrodeposition of Zn and Zn-Ni from ChCl-EG was investigated. It is shown that the additives modified the morphology and deposition mechanism of deposits. It is demonstrated the grain refinement properties of the additives with the smallest crystal size of 31.7 nm for the zinc film obtained with DMSO, which was also the best corrosion resistant film within the Zn samples prepared. For the Zn-Ni films the within the additives tested the best anti-corrosion Zn-Ni film was the one obtained in the presence of ethylenediamine.
Also describe is the effect of the hydrogen bond donor and the metal concentration in solution. As hydrogen bond donor were studied ethylene glycol and urea to electrodeposit Mn-Sn and Co-Sn alloys. The results showed that the amount of tin incorporated in the deposit is highly dependent on the DES used. In case of Mn-Sn the amount of tin incorporated in the deposit was limited to a maximum of 6.7 wt% for the samples obtained with the urea-based DES. Additionally, it is demonstrated that the metal proportion in the deposit have a pronounced effect on the physical properties of the Co-Sn and Mn-Sn deposits.
The deposition of a cobalt-multi-walled carbon nanotubes (MWCNTs) composite is also described. The results showed that nanotubes can stably dispersed in ChCl-urea. The incorporation of MWCNTs into the metal matrix contributed to decreasing the deposit's roughness. From the corrosion resistance point of view the samples prepared exhibited a comparable corrosion performance when compared with the pure cobalt films.
The feasibility of TiO2 deposition from ChCl-EG was investigated. The results showed that crystalline TiO2 is obtained after annealing and only for the samples obtained in the presence of ethylenediamine or LiF.
Notlar:
School code: 5896
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(693580.1) | 693580-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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