Calculation of the surface potential and surface charge density by measurement of the three-phase contact angle

2012 ◽  
Vol 385 (1) ◽  
pp. 218-224 ◽  
Author(s):  
H. Horiuchi ◽  
A. Nikolov ◽  
D.T. Wasan
Keyword(s):  
Contact Angle ◽  
Charge Density ◽  
Surface Charge ◽  
Surface Potential ◽  
Surface Charge Density ◽  
Phase Contact ◽  
Three Phase

scholarly journals The study of surface wetting, nanobubbles and boundary slip with an applied voltage: A review

2014 ◽  
Vol 5 ◽  
pp. 1042-1065 ◽  
Author(s):  
Yunlu Pan ◽  
Bharat Bhushan ◽  
Xuezeng Zhao
Keyword(s):  
Contact Angle ◽  
Fluid Flow ◽  
Charge Density ◽  
Surface Charge ◽  
Liquid Flow ◽  
Applied Voltage ◽  
Surface Charge Density ◽  
Slip Length ◽  
Surface Wetting ◽  
Boundary Slip

The drag of fluid flow at the solid–liquid interface in the micro/nanoscale is an important issue in micro/nanofluidic systems. Drag depends on the surface wetting, nanobubbles, surface charge and boundary slip. Some researchers have focused on the relationship between these interface properties. In this review, the influence of an applied voltage on the surface wettability, nanobubbles, surface charge density and slip length are discussed. The contact angle (CA) and contact angle hysteresis (CAH) of a droplet of deionized (DI) water on a hydrophobic polystyrene (PS) surface were measured with applied direct current (DC) and alternating current (AC) voltages. The nanobubbles in DI water and three kinds of saline solution on a PS surface were imaged when a voltage was applied. The influence of the surface charge density on the nanobubbles was analyzed. Then the slip length and the electrostatic force on the probe were measured on an octadecyltrichlorosilane (OTS) surface with applied voltage. The influence of the surface charge on the boundary slip and drag of fluid flow has been discussed. Finally, the influence of the applied voltage on the surface wetting, nanobubbles, surface charge, boundary slip and the drag of liquid flow are summarized. With a smaller surface charge density which could be achieved by applying a voltage on the surface, larger and fewer nanobubbles, a larger slip length and a smaller drag of liquid flow could be found.

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.

scholarly journals Effects of Intramolecular Double Bonds on Micellar Surface Potential and Surface Charge Density of Icosapolyenoic Acids

1999 ◽  
Vol 48 (12) ◽  
pp. 1371-1376,1417 ◽  
Author(s):  
Shoko YOKOYAMA ◽  
Yoshihiro FUJINO ◽  
Tadahiro TAKEDA ◽  
Masahiko ABE
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Surface Potential ◽  
Surface Charge Density ◽  
Double Bonds
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