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Mechanical and Structural Properties of BaCrO 4 Nanorod Films under Confinement and Shear
Author(s) -
Gourdon D.,
Yasa M.,
Godfrey Alig A. R.,
Li Y.,
Safinya C. R.,
Israelachvili J. N.
Publication year - 2004
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200305078
Subject(s) - nanorod , materials science , shearing (physics) , birefringence , surface forces apparatus , pulmonary surfactant , composite material , atomic force microscopy , diffraction , tribology , shear stress , shear (geology) , shear rate , shear force , nanotechnology , optics , rheology , chemical engineering , physics , engineering
Using an X‐ray surface forces apparatus (X‐SFA) we have investigated the effects of normal load (stress) and shear on the ordering and tribological properties of 10 nm × 30 nm surfactant‐coated BaCrO 4 nanorods in isooctane, confined within submicrometer films. The film structure and corresponding friction forces were monitored as a function of time and shearing distance at different gap sizes and loads. The X‐ray diffraction patterns indicate a cubic phase of nanorods coexisting with a surfactant phase that depends on the load, film thickness, shear rate, and shearing time. Atomic force microscopy and birefringence measurements performed on each surface after a shearing experiment showed ordered domains of nanorods over length scales of several tens of micrometers.