scholarly journals Scanning Electrochemical Microscopy as a Tool for the Characterization of Dental Erosion

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Pollyana S. Castro ◽  
Alex S. Lima ◽  
Tiago L. Ferreira ◽  
Mauro Bertotti
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Dental Erosion ◽  
Tooth Surface ◽  
Hard Tissue ◽  
Erosion Process ◽  
Irreversible Loss ◽  
Solution Ph ◽  
Ph Values ◽  
Electrochemical Microscopy

When the tooth is exposed to acidic environments, an irreversible loss of dental hard tissue occurs in a process called dental erosion. In this work, the scanning electrochemical microscopy (SECM) was used to probe the consumption of protons at the vicinity of a tooth surface with a platinum microelectrode fixed at −0.5 (V) versus Ag/AgCl/KCl(sat). SECM approach curves were recorded to assess the extent of diffusion in the solution close to the tooth substrate. SECM images clearly demonstrated that the acid erosion process is very fast at solution pH values in the range between 3 and 4.

scholarly journals Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1132 ◽  
Author(s):  
Rejane M. P. da Silva ◽  
Javier Izquierdo ◽  
Mariana X. Milagre ◽  
Abenchara M. Betancor-Abreu ◽  
Isolda Costa ◽  
...  
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Oxygen Depletion ◽  
Localized Corrosion ◽  
Alloy Surface ◽  
Al Alloy ◽  
Spatially Resolved ◽  
Lower Oxygen ◽  
Local Ph ◽  
Electrochemical Microscopy

Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy.

Characterization of Cathode/Electrolyte Interfacial Processes By Scanning Electrochemical Microscopy

2020 ◽  
Vol MA2020-02 (1) ◽  
pp. 159-159
Author(s):  
Di Huang ◽  
Chaiwat Engtrakul ◽  
Sanjini U. Nanayakkara ◽  
Hongmei Luo ◽  
Robert Tenent
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Interfacial Processes ◽  
Electrochemical Microscopy

The Alternating Current Scanning Electrochemical Microscopy Characterization of Diatom Cell Activity Affected by Paeonol

2014 ◽  
Vol 707 ◽  
pp. 113-116 ◽  
Author(s):  
Shou Huan Zhao ◽  
Ji Yong Zheng ◽  
Jing Ya Yang ◽  
Cun Guo Lin ◽  
Wei Wang ◽  
...  
Keyword(s):  
Cell Activity ◽  
Scanning Electrochemical Microscopy ◽  
Alternating Current ◽  
Electrochemical Activity ◽  
Chemical Stimulus ◽  
Cellular Activity ◽  
High Frequencies ◽  
Microscopy Characterization ◽  
Electrochemical Microscopy

The alternating current scanning electrochemical microscopy (AC-SECM) is an important method to characterize the electrochemical activity of living cells. In this paper, we apply AC-SECM to measure the electrochemical activity of diatom biofilm. We find that the diatom biofilm presents insulating effect to decrease the current, when the electrode is close to the biofilm. The alternating current impedance of diatom biofilm is overall smaller than that of the bare glass. To investigate the possible effect of chemical stimulus on cellular activity, the diatoms were immersed into paeonol solution (100 μg/mL), and AC-SECM imaging experiments were conducted when immersion time reached 20 h, 25 h and 35 h. The AC measurements performed at high frequencies show that phase angle decreases over time, which preliminarily indicates that the cellular activity of diatoms is affected by paeonol.

Characterization of Microfabricated Probes for Combined Atomic Force and High-Resolution Scanning Electrochemical Microscopy

2006 ◽  
Vol 78 (15) ◽  
pp. 5436-5442 ◽  
Author(s):  
Maurizio R. Gullo ◽  
Patrick L. T. M. Frederix ◽  
Terunobu Akiyama ◽  
Andreas Engel ◽  
Nico F. deRooij ◽  
...  
Keyword(s):  
High Resolution ◽  
Scanning Electrochemical Microscopy ◽  
Atomic Force ◽  
Electrochemical Microscopy
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