TIT# Extraction, representation and interpretation of nanoscale domain
structure information from small-angle scattering patterns
AUT# Stribeck, Norbert;
SOU# Fibr. Text. EE (2003), 11(5), 33-45
LOC# xv073
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ABS# A method for SAXS analysis and its applications to the field
of materials science is presented and corresponding papers
are reviewed. The method permits to extract and visualize
topological structure information contained in scattering
patterns from small-angle scattering (SAS) without complex
pretreatment. Multi-dimensional data can be processed. Such
data are for instance accumulated in the field of materials
science in time-resolved in-situ SAXS experiments with
synchrotron radiation. The result is a multi-dimensional
chord distribution function (CDF), that is defined as the
Laplacian of the correlation function. It is equivalent
to the autocorrelation of the gradient of the electron density.
The procedure is, in particular, adapted to the analysis
of the nanoscale structure of samples with fiber symmetry,
such as of polymer fibers or of strained elastomers. Multi-dimensional
relations among morphological components become apparent
in real space and help to elucidate the nature of processes
governing evolution of nanostructure. The background subtraction
problem is proposed to be solved by spatial frequency filtering.
According to the proposed notion, the domain structure information
of the studied nanocomposite is contained in the spatial
frequency band between background and noise. The method
can be applied to scattering curves from isotropic samples
as well. In this case chord length distributions (CLD) or
interface distributions (IDF) are computed. Here the advantage
of the method is the possibility to automate data evaluation
and thus to become able to process large data sets that
are frequently recorded in time resolved experiments. Examples
from straining and melting studies of thermoplastic elastomers
and polyethylene are presented.