Experimental Observation of the Ion–Ion Correlation Effects on Charge Inversion and Strong Adhesion between Mica Surfaces in Aqueous Electrolyte Solutions

Citations Over TimeTop 10% of 2014 papers

Abstract

Direct force measurements between two mica surfaces in aqueous electrolyte solutions over broad ranges of LaCl3 concentrations and pH values were carried out with a surface forces apparatus. Charge inversion on mica surfaces is detected once the LaCl3 concentration reaches a critical value. With the continual increase of LaCl3 concentrations, the mica surface will be overscreened by the counterions. It is demonstrated that the two mica surfaces may experience the jump-in contact even at high LaCl3 concentrations, which is seldom seen in monovalent salt solutions. The strong adhesion cannot be attributed to the van der Waals force alone, but should include the ion-ion correlation forces. Through adjusting the pH values in LaCl3 solutions, the ion-ion correlation force can be evaluated quantitatively. These results provide important insight into the fundamental understanding in the role of ion-ion correlations in ion screening mechanism and interactions between charged objects.

Related Papers

• → Dodecylamine collector — pH effect on mica flotation and correlation with thin aqueous foam film and surface force measurements(1996)49 cited
• → Interactions between layers of salivary acidic proline rich protein 1 (PRP 1) adsorbed on mica surfaces(2008)14 cited
• → Time Dependence of Interactions between a Surfactant-Coated Substrate and a Uniformly Charged Surface(2012)8 cited
• → A fundamental study of mica flotation in dodecylamine collector(2007)3 cited
• ADHESION FORCES BETWEEN MICA SURFACES IN AIR AND LIQUIDS(1995)