The potential of ring-disk ultramicroelectrodes (RD UMEs) as probes for scanning electrochemical microscopy (SECM) was investigated both theoretically and experimentally. In particular, the disk-generation/ring-collection (DG/RC) mode of operation was considered. In this case, the interaction of two species with the substrate under investigation can be followed simultaneously from single tip cu...

Advances in vacuum-tight in situ liquid cell TEM systems have attracted significant attention because of the ability to directly interpret chemical and electrochemical reactions within their native liquid environments [1]. Conducting quantitative in situ electrochemistry experiments within the S/TEM is feasible using the relatively new platform of in situ electrochemical S/TEM (ec-S/TEM). In th...

Anodic particle coloumetry is used to size silver nanoparticles impacting a carbon microelectrode in a potassium chloride/citrate solution. Besides their size, their agglomeration state in solution is also investigated solely by electrochemical means and subsequent data analysis. Validation of this new approach to nanoparticle agglomeration studies is performed by comparison with the results of...

A new concept for the localized characterization of gas evolving electrodes based on scanning electrochemical microscopy (SECM) is suggested. It offers information about the spatial distribution of the predominant locations, which represent the most active catalytic sites, and dynamic characteristics of gas-bubble departure. The knowledge about gas-bubble departure is critical for the assessmen...

Expanding upon recent applications of interfacing electricity with centrifugal microfluidic platforms, we introduce electrochemical velocimetry to monitor flow in real-time on rotating fluidic devices. Monitoring flow by electrochemical techniques requires a simple, compact setup of miniaturized electrodes that are embedded within a microfluidic channel and are connected to a peripherally-locat...

Stephanie S. Everett, Kenneth Wauchope Navy Ctr . for Appl ied Resea rch in AI Naval Resea rch L a b o r a t o r y W a s h i n g t o n , DC 20375, USA e v e r e t t I w a u c h o p e © a i c , n r l . n a v y . m i l Manuel A. P f i r e z Dept . E lec t r ica l & C o m p u t e r Eng inee r ing Rec in to Unive r s i t a r io de Mayaguez , U P R Mayaguez , P R 00681 m p e r e z © e x o d o , u p ...

Analysis of many biochemical processes is of great significance for clinical, biological, food, environmental as well as bioterror applications. But, exchanging of the biochemical information to kind of electronic signal is a defiance due to connecting an electronic tool directly to a biological surrounding. Electrochemical detection instrument due to its advantageous to analyze the subject of ...

A la rge data base was co l lec ted from a human in formant . The data consisted of b e l i e f s regarding p a r e n t c h i l d r e l a t i o n s . A v a r i e t y of fac to rs in searching the data base were manipulated in an attempt to discover which were the more important i n c o n t r i b u t i n g to estimates o f c r e d i b i l i t y . Problems of data c o l l e c t i o n , data repre...

in the present work, the electrooxidation of formic acid and formaldehyde; potentially important fuels for future fuel cells, was investigated on the fe3o4@pt core-shell nanoparticles/carbon-ceramic electrode (fe3o4@pt/cce). the fe3o4@pt nanoparticles were prepared via a simple and fast chemical method and their surface morphology, nanostructure properties, chemical composition, crystal phase, ...

this paper focused on the characterization of electrochemical behavior of a martensitic stainless steel inthe acidic solutions. for this purpose, electrochemical parameters were derived from potentiodynamicpolarization, mott schottky analysis and electrochemical impedance spectroscopy (eis) techniques.the potentiodynamic polarization results showed that corrosion current density of aisi 420 sta...