Friction anisotropy and asymmetry of a compliant monolayer induced by a small molecular tilt

Science

Volumn 280, Issue 5361, 1998, Pages 273-275

  Liley, M ^a,d   Gourdon, D ^a   Stamou, D ^a   Meseth, U ^a   Fischer, T M ^b   Lautz, C ^b   Stahlberg, H ^a,c,e   Vogel, H ^a   Burnham, N A ^a   Duschl, C ^a  

^a EPFL   (Switzerland)

^b UNIVERSITY OF LEIPZIG   (Germany)

^c UNIVERSITY OF LAUSANNE   (Switzerland)

^d CSEM   (Switzerland)

^e UNIVERSITY OF BASEL   (Switzerland)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; ARTICLE; ELASTICITY; FRICTION; LIPID MONOLAYER; LIQUID CRYSTAL; MICROSCOPY; PRIORITY JOURNAL; STRUCTURE ANALYSIS; VISCOSITY;

EID: 0032502885     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5361.273     Document Type: Article

References (22)

1. D. Dowson, History of Tribology (Longman, London, 1979).
2. F. P. D. Bowden and D. Tabor, Friction and Lubrication of Solids, Part I (Oxford Univ. Press, Oxford, 1954).
3. H. Yoshizawa, Y.-L. Chen, J. Israelachvili, J. Phys. Chem. 97, 4128 (1993).
4. M. Hirano, K. Shinjo, R. Kaneko, Y. Murata. Phys. Rev. Lett. 67, 2642 (1991).
5. R. Overney, M. Fujihira, H. Takano, W. Paulus, H. Ringsdorf, ibid. 72, 3546 (1994).
6. L. Santesson et al., J. Phys. Chem. 99, 1038 (1995).
7. D. Gourdon et al., Tribol. Lett. 3, 317 (1997).
8. We used the amphiphile bis[8-(1,2-dipalmitoyl-sn-glycero-3-phosphoryl)-3,6-dioxaoctyl] disulfide ("thiolipid"), each molecule of which consists of two chiral phospholipids linked by a hydrophilic spacer.
9. H. Lang, C. Duschl, H. Vogel, Langmuir 10, 197 (1994).
10. A. Ulman, An Introduction to Ultrathin Organic Films: From Langmuir-Blodgett to Self-Assembly (Academic Press, San Diego, CA, 1991).
11. -1, respectively. The tip had a radius of curvature of 40 nm and an amorphous silicon oxide surface. The applied load and the adhesive force were each ∼5 nN.
12. 2 adlayers.
13. C. Giacovazzo, Ed., Fundamentals of Crystallography (Oxford Univ. Press, Oxford, 1992), p. 83.
14. U. D. Schwarz, H. Bluhm, H. Hölscher, W. Allers, R. Wiesendanger, in The Physics of Sliding Friction, B. N. J. Persson and E. Tosatti, Eds. (Kluwer Academic, Dordrecht, Netherlands, 1996), pp. 369-402.
15. A. Fischer and E. Sackmann, Nature 313, 299 (1985).
16. D. Hönig and D. Möbius, J. Phys. Chem. 95, 4590 (1991).
17. C. Lautz, J. Kildae, T. M. Fischer, J. Chem. Phys. 106, 7448 (1997).
18. We estimate that the tip penetrates ∼5 Å into the lipid monolayer domains, which have a thickness of 25 Å.
19. S. Chandrasekhar, Liquid Crystals (Cambridge Univ. Press, Cambridge, 1992).
20. R. M. Overney et al., Langmuir 10, 1281 (1994).
21. Brewster angle microscopy could not be used to characterize the lipid layers on mica because it is an unsuitable substrate for optical reflection techniques.
22. Supported by the Swiss National Research Foundation (NFP 36: 4036-044084/1), SPP Biotechnology, and the board of the, Swiss Federal Institutes of Technology (SPP MINAST, 7.06).