The effects of plating factors on the magnetic properties of electrodeposited Co-P have been investigated using a Cu substrate in chloride baths containing NaH2PO2 at 50°C under galvanostatic conditions. The coercive force (Hc), the residual magnetization (Mr), and the Mr/Ms ratio measured along in-plane (||) and perpendicular (⊥) directions to the Co-P film plane changed with variations in the NaH2PO2 concentration in the bath, organic additives, and current density. Under conditions where the c-axis of hexagonal crystals deposited was oriented perpendicular to the film plane, the Mr (⊥) and the Mr/Ms (⊥) increased, and the Mr (||) and the Mr/Ms (||) decreased. The Hc was dependent on the crystal grain size of deposited Co-P. The Hc increased with a decrease in the grain size of deposits in the range of 15 to 31nm, while the Hc decreased with a decrease in the grain size in a range no longer than 15nm. On the other hand, the Hc also tended to increase when the c-axis of hexagonal crystals deposited was oriented perpendicular to the film plane.
Electrochemical disinfection was studied using carbon fiber electrodes with Saccharomyces cerevisiae to which the electric potential was applied. Effective disinfection was obtained by applying the electric potential over 0.7V (vs. SCE) onto the carbon fiber electrodes. The mechanism of disinfection was discussed in terms of the two electrolysis potentials 1.0V (relatively low potential) and 1.5V. With the relatively low electrolysis potential around 1.0V, it appears that disinfection was accomplished by the electron transfer between the microbial cells and the electrode surface, although the process required a relatively long period of electrolysis (about 24 hours). With the electrolysis over 1.5V, results indicated that effective disinfection was successfully performed by both the action of active chlorine and of an acidic atmosphere that were produced by electrolysis. Electrochemical disinfection was clearly observed even in phosphate buffer solutions (Cl-free). This tinding suggests that other active species except active chlorine were produced by electrolysis.