Department of Physics and Astronomy, University of Nebraska at Kearney, Kearney, NE, USA;
Department of Animal Science, University of Nebraska-Lincoln, Lincoln, NE, USA;
1709 West 38th Street, Kearney, NE-68845, Nebraska, USA;
Atomic; Force; Microscopy; Surface; Charge; Density; Electrical; Double; Layer; Force; and; Van; der; Waals; Force;