| Summary: | 碩士 === 高苑科技大學 === 高分子環保材料研究所 === 95 === The Fe-Co-Ni deposit with nanostructure and Ni-P-Ti deposit was plated by the cyclic voltammetry and DC plating, respectively. Both deposits containing TiO2 powders were examined with anti-corrosion ability, behavior of cycle voltammetry, hydrogen evolution, oxygen evolution, and antiseptic activity. In addition, the physical properties of both deposits were measured by XRD and SEM. The efficiency of bio-mass harvest by Pt net is in the third part of this thesis. The aim of this work discusses the relationship between metal materials and bacteria.
The Fe-Co-Ni deposits with nanostructure were doped with TiO2 powders on the surface. Furthermore, the efficiency of anti-corrosion and oxidation evolution are better than the Fe-Co-Ni deposit without doping TiO2. According to the examination of SEM and EDS, TiO2 were doped uniformly to improve the anti-bacteria efficiency over 97.5%.
Ni-P-Ti deposits were plated with TiO2 in Ni-P plating bath. The pH of plating bath is an important factor to influence the TiO2 content on the Ni-P deposit. While pH of plating bath is 5, the maximum Ti contents (25 at. % Ti) is achieved on the Ni-P-Ti deposit. The maximum Ti content in the Ni-P-Ti deposit was plated by plating bath containing 5g /l TiO2 with, current density of 0.6 A cm-2, and at 25 C during 10 min. In addition, the anti-bacteria ratio is increased with the increasing Ti content. Moreover, the maximum anti-bacteria ratio is 99.95 %.
Bacteria and yeast were found the anodic current peak in the LSV analysis. In addition, the anodic current peak of E. Coli was examined at 3.9 V in the LB. SEM shows that cell wall was damaged by electric current in the electric harvest process. Moreover, the cell wall was removed during a long collection period. After removing the cell wall, the bacteria was permeated water leading to the density of bacteria become smaller than water. Moreover, the polysaccharides on the cell member of bacteria were linked to each other. Then, the bio-mass on the surface of LB solution was structured by bacteria without cell wall. Hence, the collection ratio of bacteria and yeast by electric harvest are over 85 %.
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