Surface Tension Obtained from Various Smectic Free-Standing Films: The Molecular Origin of Surface Tension
Source abstract
Abstract
High-resolution surface tension measurements have been carried out on the free-standing films of more than 30 selected liquid-crystal compounds in their smectic phases. Surface tension (γ) values falling into major categories of 27, 24, 21, 13, and 11.5 dyn/cm have been obtained. The dependence of γ on specific terminal groups or molecular structures will be discussed. Our results provide important information about the molecular origin of surface tension.
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Research context
OpenAlex topics: Liquid Crystal Research Advancements · Surfactants and Colloidal Systems · Photonic Crystals and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, Centre de Recherche Paul Pascal, CNRS, Universite de Bordeaux I, Avenue A. Schweitzer, F-33600 Pessac, France, FOMInstitute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands, Laboratoire de Chemie Organique du Fluor, Universite De Nice-Sophia Antipolis, F-06108 Nice Cedex 2, France, Naval Research Laboratory, Code 6900, Center for Biomolecular Science and Engineering, Washington, D.C....
References (46)
Show source-provided references
1. Adamson A. W. · 1990
2. Israelachvili J. N. · 1992
3. Young, T.Miscellaneous Works; Peacock, G., Ed.; Murray: London, 1855; p 1.
4. Gibbs J. W. · 1906 · 1
5. Wu X. Z. · Phys. Rev. Lett. · 1993 · 70 · 95810.1103/PhysRevLett.70.958 ↗
6. Frommer J. · Angew. Chem., Int. Ed. Engl. · 1992 · 31 · 129810.1002/anie.199212981 ↗
7. Naselli C. · J. Chem. Phys. · 1989 · 90 · 385510.1063/1.455791 ↗
8. Barton S. W. · J. Chem. Phys. · 1992 · 96 · 134310.1063/1.462170 ↗
9. Bain C. D. · J. Am. Chem. Soc. · 1989 · 111 · 715510.1021/ja00200a039 ↗
10. Schick · 1990
11. Zisman W. · 1962 · 176
12. Kissa · 1994
13. Langmuir I. · J. Am. Chem. Soc. · 1916 · 38 · 222110.1021/ja02268a002 ↗
14. Mach P. · Phys. Rev. Lett. · 1998 · 80 · 73210.1103/PhysRevLett.80.732 ↗
15. de Gennes P. G. · 199310.1093/oso/9780198520245.001.0001 ↗
16. Bahr Ch. · Int. J. Mod. Phys. B · 1994 · 8 · 305110.1142/S0217979294001299 ↗
17. Stoebe T. · Phys. Rev. Lett. · 1992 · 68 · 294410.1103/PhysRevLett.68.2944 ↗
18. Zisman, W. A.Adv. Chem. Ser.1964,No. 43,1.10.1021/ba-1964-0043.ch001 ↗
19. Rosenblatt C. · Appl. Phys. Lett. · 1980 · 36 · 43210.1063/1.91534 ↗
20. Sirota E. B. · Phys. Rev. A · 1987 · 36 · 289010.1103/PhysRevA.36.2890 ↗
21. Mach P. · Europhys. Lett. · 1997 · 40 · 39910.1209/epl/i1997-00478-8 ↗
22. Stoebe T. · Phys. Rev. E · 1994 · 49 · 523810.1103/PhysRevE.49.5238 ↗
23. Miyano K. · Phys. Rev. A · 1982 · 26 · 182010.1103/PhysRevA.26.1820 ↗
24. Pieranski P. · Physica A · 1993 · 194 · 36410.1016/0378-4371(93)90369-F ↗
25. Eberhardt M. · Rev. Sci. Instrum. · 1996 · 67 · 284610.1063/1.1147116 ↗
26. Mach P. · J. Phys. II · 1995 · 5 · 217
27. For · Mol. Cryst. Liq. Cryst. · 1977 · 38 · 35310.1080/15421407708084399 ↗
28. Chaudhury M. K. · Langmuir · 1991 · 7 · 101310.1021/la00053a033 ↗
29. Good R. J. · J. Phys. Chem. · 1960 · 64 · 56110.1021/j100834a012 ↗
30. Fowkes, F. M.Adv. Chem. Ser.1964,No. 43,99.10.2307/20039081 ↗
31. Gibbs J. H. · J. Am. Chem. Soc. · 1951 · 73 · 511510.1021/ja01155a029 ↗
32. Kissa · 1994
33. Mach P. · Langmuir · 1997 · 13 · 635710.1021/la970907j ↗
34. Mol E. A. L. · Phys. Rev. E · 1996 · 54 · 53610.1103/PhysRevE.54.536 ↗
35. Doi T. · Mol. Cryst. Liq. Cryst. · 1991 · 204 · 910.1080/00268949108046589 ↗
36. Stoebe T. · Phys. Rev. E · 1996 · 53 · 166210.1103/PhysRevE.53.1662 ↗
37. Clark N. A. · Appl. Phys. Lett. · 1980 · 36 · 89910.1063/1.91359 ↗
38. Lobko T. A. · Liq. Cryst. · 1993 · 15 · 36110.1080/02678299308029137 ↗
39. Kromm P. · Liq. Cryst. · 1996 · 21 · 12110.1080/02678299608033802 ↗
40. Diele S. · Liq. Cryst. · 1996 · 21 · 60310.1080/02678299608032871 ↗
41. Liu H. · Liq. Cryst. · 1997 · 22 · 21710.1080/026782997209595 ↗
42. Smart · 1994 · 5710.1007/978-1-4899-1202-2_3 ↗
43. For completeness, there is one additional difference between the two tail types that should be mentioned. Namely, the fluoroalkyl tails have been shown to be more “stiff” than their hydroalkyl counterparts, assuming (in a thermal average sense) a helical as opposed to planar-trans chain conformation (ref 49), in which the energy for gauche bond orientations is larger (by over a factor of 2 (Bates, T. W. InFluoropolymers; Wall, L. A., Ed.; John Wiley & Sons: New York, 1972; p 451.), indicated also in Table 2). It is possible that the greater conformational flexibility of the hydroalkyl tails at a given temperature may “dynamically” reduce the excluded volume difference between the hydrogen- and fluorine-containing tails, which are otherwise of roughly equal length. Countering this idea, however, we can consider (as a first approximation) the roughly 30% larger “static” excluded volume for fluoroalkyl versus hydroalkyl tails, compared with only a 15% larger specific volume for alkanes in liquid as opposed to crystalline state (ref 50). This suggests that dynamical effects do not wash out the steric differences discussed above. Molecular conformation simulations addressing these more subtle dynamical issues would be extremely valuable in confirming this reasoning. We plan to pursue such studies in the course of our continuing research on partially fluorinated materials.
44. Bunn C. W. · Nature · 1954 · 174 · 54910.1038/174549a0 ↗
45. Shafrin E. G. · J. Phys. Chem. · 1962 · 66 · 74010.1021/j100810a039 ↗
46. Guyot-Sionnest P. · Phys. Rev. Lett. · 1986 · 57 · 296310.1103/PhysRevLett.57.2963 ↗