An AFM liquid cell has been used to monitor the adsorption of progesterone onto mica in situ. By imaging the surface in water and subsequently injecting a solution of the hormone, the adsorption process itself can be followed from time zero. Due to the negative character of the progesterone molecules and the negatively charged mica surface, adsorption does not happen without the addition of a divalent cation which neutralises the mica surface and makes it positively charged, allowing the hormone to start to adsorb. The sequence of AFM images above (see Figure 1a - j) shows the progress of the experiment with time.
|Translated title of the contribution||Progesterone adsorption and degradation on mineral surfaces|
|Title of host publication||X Annual Linz Winter Workshop, Linz, Austria|
|Publication status||Published - 15 Feb 2008|