Determination of the Ionization State of 11-Thioundecyl-1-phosphonic Acid in Self-Assembled Monolayers by Chemical Force Microscopy
作者:Jin Zhang、Jennifer Kirkham、Colin Robinson、Mark L. Wallwork、D. Alastair Smith、Andrew Marsh、Michael Wong
DOI:10.1021/ac9913107
日期:2000.5.1
previously reported for acid force titrations. On the basis of JKR theory, the surface pKavalues of the phosphate group in high ionic strength solutions were found to be 4.5 and 7.7, respectively. However, in light of the effects of ionic strength on the force titrationcurves, we discuss the applicability of JKR theory to nanoscopic measurements of adhesion force and surface pKa.