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Tribological properties of N-isopropylacrylamide as studied by scanning force microscopy

par Matzelle, Thomas ;Herkt-Bruns, Ch;Heinrich, Laurence A.;Kruse, Norbert
Référence Surface science, 454-456, 1, page (1010-1015)
Publication Publié, 2000-05

Article révisé par les pairs

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Résumé :

The tribological properties of N·isopropylacrylamide (NIPA) gel surfaces were studied using scanning force microscopy (SFM) in air or in a temperature-controlled liquid cell. Topography and friction were probed with smooth, micrometer-sized glass spheres mounted on V-shaped cantilevers. The friction coefficient u, were evaluated from the slope of plots of the lateral force versus load. The respective value for the water-swollen NIPA gel (u= 0.42 ± 0.05) was found to be only slightly smaller than that for the dry geL but higher by a factor of more than 10 compared with macrotribological measurements in water. The high friction of NIPA in water is most probably influenced by the long-range adhesive forces (ranging up to 13 nN) as observed in measurements of force- displacement curves.