title: Self-affine crossover length in a layered silicate deposit.
abstract: Self-affine dehydrated colloidal deposits on fresh mica surfaces of the synthetic layered silicate 2:1 smectite clay laponite have been studied by means of atomic force microscopy (AFM). AFM images of these prepared assemblies of sol and gel aggregates have been analyzed both by means of standard AFM Fourier software and a wavelet method. The deposited surfaces show a persistence to antipersistent crossover with a clay concentration dependent crossover length. It is concluded that the crossover length is associated with aggregate size, and further that the persistent roughness at small length scales signals near compact clusters of fractal dimension three, whereas the antipersistent roughness at large length scales signals a sedimentation process.
authors.affiliation: Department of Physics, The Norwegian University of Science and Technology, NTNU, N-7491 Trondheim, Norway. jon.fossum@phys.ntnu.no
authors.forename: J O
authors.initials: JO
authors.lastname: Fossum
authors.forename: H H
authors.initials: HH
authors.lastname: Bergene
authors.forename: Alex
authors.initials: A
authors.lastname: Hansen
authors.forename: B
authors.initials: B
authors.lastname: O'Rourke
authors.forename: G
authors.initials: G
authors.lastname: Manificat