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Oxide nanotube arrays fabricated by anodizing processes for advanced material application
이우진,William H. Smyrl 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Extended and oriented nanostructures are desirable for many applications, but direct fabrication of complex nanostructures with wellaligned morphology, orientation and surface architectures remains a significant challenge. Here, we report a successful robust fabrication of titanium (Ti) and zirconium (Zr) oxide nanotubes by a simple electrochemical anodizing process without the use of any template. The nanotubes formed perpendicular to the metal substrates and had an open ended array of continuous, well-aligned conformation with various hole sizes, depending upon applied anodizing voltages and times. Both the TiO₂ and ZrO₂ nanotubes have a uniform diameter which may make them suitable for chemical sensing, catalysis, optical emission and nanoelectrode assembly for batteries and electrochemistry. Extended and oriented nanostructures are desirable for many applications, but direct fabrication of complex nanostructures with wellaligned morphology, orientation and surface architectures remains a significant challenge. Here, we report a successful robust fabrication of titanium (Ti) and zirconium (Zr) oxide nanotubes by a simple electrochemical anodizing process without the use of any template. The nanotubes formed perpendicular to the metal substrates and had an open ended array of continuous, well-aligned conformation with various hole sizes, depending upon applied anodizing voltages and times. Both the TiO₂ and ZrO₂ nanotubes have a uniform diameter which may make them suitable for chemical sensing, catalysis, optical emission and nanoelectrode assembly for batteries and electrochemistry.
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QCM and Electrochemical Studies of Li and Zn Intercalation in V6O13 ( NS )
Park, Heai Ku,Such, Soong Hyuck,Smyrl, W. H. 한국공업화학회 1995 Journal of Industrial and Engineering Chemistry Vol.1 No.1
Quartz crystal microbalance(QCM) and linear sweep voltammetry were empolyed to perform in situ mass and charge measurement on Li/V_6O_13(NS) and Zn/V_6O_13(NS) cells. At low Li and Zn compositions in V_6O_13, the simple metal ion intercalation/release process was observed. But at high Li and Zn compositions, secondary processes(morphology change and other complexities), in addition to simple metal ion insertion, were involved during intercalation process and morphology change occurred during deintercalation process. Early faradaic capacity loss of the cell was largely due to the secondary processes.
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Effect of alloying Copper on the Corrosion Resistance of Stainless Steels in Chloride Media
Ujiro, T.,Satoh, S.,Staehle, R. W.,Smyrl, W. H. 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.3
In order to explain the effect of alloying Cu on the corrosion resistance of stainless steels in chloride mediaIbr both ferritic and austenitic stainless steels, the corrosion behavior of Cu-hearing stainless steels was investigated. Alloying Cu showed heneticial effect in an active potential range and harmful effect in a noble potential range. The beneticial effect of alloying Cu was explained by the stability of deposited Cu on an anodic surface. Difference in the effect of alloying Cu between the ferritic and austenitic steels was ascribed by the differences in their corrosion potentials and thc morphology of the deposited Cu.
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다기능 NSOM (mf-NSOM) 을 이용한 나노 구조 재료 분석에 관한 원리와 응용
이우진,변수일,Lee Woo-Jin,Pyun Su-Il,Smyrl W. H. 한국전기화학회 2004 한국전기화학회지 Vol.7 No.2
최근 근접장 광학주사현미경 (NSOM)을 이용한 재료의 표면 및 구조 분석은 생물학에서 재료과학에까지 광범위하게 응용되고 있다. 본 총설에서는 기존의 NSOM을 여러가지 현미경법 (광학, 형광, 전자 및 전기화학 현미경 관찰법)과 접목하여 구성한 다기능 NSOM (multi-functional NSOM, mf-NSOM)을 이용, 나노 재료의 고분해능 이미징에 대한 원리와 응용을 고찰하였다. 본 mf-NSOM 기술을 이용하여 실제로 Al합금 및 다결정 Ti 표면에서의 공식 (pitting)을 일으키는 취약 지역을 광학적으로 분석한 결과를 기술하였다. 또한, mf-NSOM과 레이저 기술을 통해 나노 Ag 입자를 형성하고 실시간 분석한 연구결과에 대해서도 소개하고자 한다. Imaging of surfaces and structures by near-field scanning optical microscopy (NSOM) has matured and is routinely used for studies ranging from biology to materials science. Of interest in this review paper is a versatility of modified or multi-functional NSOM (mf-NSOM) to enable high resolution imaging in several modes: (1) Concurrent fluorescence and Topographical Imaging (gases) (2) Microspectroscopy (gases) (3) Concurrent Scanning Electrochemical and Topographical Imaging (SECM) (liquids) (4) Concurrent Photoelectrochemical and Topographical Imaging (PEM) (liquids) The present study will summarize some of the recent advances in mf-NSOM work confirmed and supported by the results from several other imaging techniques of optical, fluorescence, electron and electrochemical microscopy. The studies are directed at providing local information on pitting precursor sites and vulnerable areas on metal and semiconductor surfaces, and at reactive sites on heterogeneous, catalytic substrates, especially on Al 2024 alloy and polycrystalline Ti. In addition, we will introduce some results related to the laser-induced nanometal (Ag) synthesis using mf-NSOM.
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