The new approach in the determination of the dependency of surface charge density on semiconductor surface potential based voltage: capacity analysis of the depletion region of MIS-structures

2008 ◽  
Author(s):  
G. V. Chucheva ◽  
A. G. Zhdan
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Potential ◽  
Surface Charge Density ◽  
Depletion Region ◽  
Semiconductor Surface ◽  
Capacity Analysis ◽  
New Approach ◽  
Mis Structures

Surface potential and conductance induced in lipid bilayers by the negatively charged ionophore Br-X537A

1982 ◽  
Vol 60 (1) ◽  
pp. 42-48 ◽  
Author(s):  
G. Roy ◽  
Y. Okada ◽  
R. Laprade
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Lipid Bilayers ◽  
Concentration Dependence ◽  
Surface Potential ◽  
Surface Charge Density ◽  
Ph Dependence ◽  
Neutral Molecule ◽  
Effect Of Ph

The adsorption of Br-X537A and its effect on the surface potential of monoolein lipid bilayers was measured using the nonactin conductance as a probe to determine the surface charge density. Because of the pH dependence of this adsorption, it was concluded that not only the negatively charged molecules X− could induce a surface charge but also a dimer HX2− made from X− and the neutral molecule HX. Also an important bilayer conductance was induced by Br-X537A. From the Br-X537A concentration dependence of this conductance, the effect of pH, and the induced surface potential, it was found that two charged complexes are transported across the bilayer depending on pH. At pH ≥ 7 the conducting molecule is X− and at pH ≤ 5 the complex is H2X3−. A quantitive model is obtained to calculate both the induced surface potential and the conductance.

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