Determination of diffusion coefficient in gel and in aqueous solutions using scanning electrochemical microscopy

2004 ◽  
Vol 61 (1-2) ◽  
pp. 57-67 ◽  
Author(s):  
Balázs Csóka ◽  
Géza Nagy
Keyword(s):  
Diffusion Coefficient ◽  
Aqueous Solutions ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Microscopy

scholarly journals Scanning electrochemical microscopy determination of hydrogen flux at liquid|liquid interface with potentiometric probe

2014 ◽  
Vol 43 ◽  
pp. 22-24 ◽  
Author(s):  
Justyna Jedraszko ◽  
Wojciech Nogala ◽  
Wojciech Adamiak ◽  
Hubert H. Girault ◽  
Marcin Opallo
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Liquid Interface ◽  
Hydrogen Flux ◽  
Electrochemical Microscopy

Redox reactions of reactive oxygen species in aqueous solutions as the probe for scanning electrochemical microscopy of single live T24 cells

2010 ◽  
Vol 88 (6) ◽  
pp. 569-576 ◽  
Author(s):  
Xiaocui Zhao ◽  
Mengni Zhang ◽  
Yitao Long ◽  
Zhifeng Ding
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Redox Reactions ◽  
Reactive Oxygen ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Technique ◽  
Oxygen Species ◽  
T24 Cells ◽  
Electrochemical Microscopy

The redox reactions of two main components of reactive oxygen species (ROS), superoxide and hydrogen peroxide, along with oxygen in aqueous solutions were investigated using a conventional electrochemical technique, differential pulse voltammetry (DPV). Superoxide undergoes oxidation at a Pt working electrode biased at 0.055 V versus Ag/AgCl, while hydrogen peroxide can be oxidized and reduced at 0.817 and –0.745 V, respectively. Oxygen in the solutions is reduced at the electrode with an applied potential of –0.455 V. Based on these results, hydrogen peroxide and superoxide released from live cells can be successfully monitored, identified, and mapped using scanning electrochemical microscopy (SECM) at different potentials. Single human bladder (T24) cells were imaged using a 5 μm diameter SECM probe biased at –0.400, –0.600, and –0.800 V. Oxygen reduction that seems an interference can be discriminated from that of hydrogen peroxide by means of SECM.

Sign in / Sign up

Export Citation Format

Share Document