Effects of subphase pH on the successive deposition of monolayers of docosanoic acid onto mica
We describe the effect of subphase pH on the stability of insoluble monolayers of a range of ionisable materials. Maximum stability occurs at approximately half ionisation of the film. We discuss measurements of the transfer ratio and dynamic contact angle for the deposition of docosanoic acid monolayers onto mica as a function of subphase pH in the absence of added electrolyte. Deposition changes from Z-type of Y to no net deposition as the pH is increased. In general, deposition occurs on OUT strokes when the contact angle is <90°, and on IN strokes when the contact angle is >90°.
Key wordsInsoluble monolayers dynamic contact angle Langmuir-Blodgett film docosanoic acid
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- 2.Kilvert PVA, Ph D Thesis (1989) University of HullGoogle Scholar