Lee J.M.,Pusan National University |
Lee S.H.,Daegu Technopark Nano Convergence Practical Application Center |
Kim Y.J.,Medical Device Research Laboratory |
Ko J.S.,Pusan National University
International Journal of Precision Engineering and Manufacturing | Year: 2013
This study experimentally analyzed the influence of the diffusion rate of Cu ions on the growth of microstrucutres during the coelectrodeposition of copper and nickel. To change the diffusion rate of the Cu ions resolved in the electrodeposition solution, electrodeposition was performed under three different stirring conditions (0, 150, 300 rpm). The microstructure grew in an orientation vertical to the microstructure, similar to a probe without stirring, while a popcorn-shaped cluster with electrodeposition particles at the upper part of the microstructure was found under the stirring condition. Forced circulation of the electrodeposition solution by stirring drastically enhanced the movement of the Cu ions, and popcorn shaped clusters are formed. The average height and width of the structure electrodeposited for 20 minutes through stirring at 300 rpm were 1.5 and 4.3 times greater, respectively, than those of the structure electrodeposited without stirring. The substrate surfaces covered with electrodeposited microstructures were modified to be superhydrophobic by coating them with hydrophobic plasma polymerized fluorocarbon (PPFC). © 2013 Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg.
Kalavakunta J.K.,Medical Device Research Laboratory
The American heart hospital journal | Year: 2010
The seeding of endocarditis directly to the non-valvular areas of the heart is extremely rare. We report a case of a 36-year-old woman presenting with sudden-onset lower-extremity pain and swelling, who was found to have mitral valve endocarditis with pulmonary vein vegetation. Echocardiography showed a large linear mitral valve mass coming into contact with the base of the left inferior pulmonary vein with each ventricular contraction. Spread into the atrium from mitral valve endocarditis is generally thought to be caused by jet lesions, whereas direct seeding as in this case is not well described. The location in the pulmonary vein is also unique, with no case reports being found in the literature, although the significance remains to be ascertained.