Advertisement

Effects of subphase pH on the successive deposition of monolayers of docosanoic acid onto mica

  • R. Aveyard
  • B. P. Binks
  • P. D. I. Fletcher
Interfaces
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 84)

Abstract

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 words

Insoluble monolayers dynamic contact angle Langmuir-Blodgett film docosanoic acid 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Binks BP (1991) Adv Colloid Interface Sci 34:343CrossRefGoogle Scholar
  2. 2.
    Kilvert PVA, Ph D Thesis (1989) University of HullGoogle Scholar
  3. 3.
    Peng JB, Abraham BM, Dutta P, Ketterson JB (1985) Thin Solid Films 134:187CrossRefGoogle Scholar
  4. 4.
    Aveyard R, Binks BP, Carr N, Cross AW (1990) Thin Solid Films 188:361CrossRefGoogle Scholar
  5. 5.
    Petrov JG (1986) Colloids and Surfaces 17:283CrossRefGoogle Scholar
  6. 6.
    Bikerman JJ (1939) Proc Roy Soc A 170:130CrossRefGoogle Scholar
  7. 7.
    Scales PJ, Grieser F, Healy TW (1990) Langmuir 6:582CrossRefGoogle Scholar
  8. 8.
    Pashley RM (1981) J Colloid Interface Sci 80:153CrossRefGoogle Scholar
  9. 9.
    Srinivasan MP, Higgins BG, Stroeve P, Kowel ST (1988) Thin Solid Films 159:191CrossRefGoogle Scholar
  10. 10.
    Clint JH (1973) J Colloid Interface Sci 43:132CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • R. Aveyard
    • 1
  • B. P. Binks
    • 1
  • P. D. I. Fletcher
    • 1
  1. 1.School of ChemistryUniversity of HullHullUK

Personalised recommendations