Thursday, March 31, 2011, 11:00 am — Seminar Room, Bldg. 725
Scattering is a complicated process which, depending on the form of the sample and the detection scheme,
can generate abundant structural and dynamic information for a broad range of systems such as solid state
crystal, amorphous liquid, semi-crystalline polymer, polymer/colloidal/biomacromolecular solution, etc.
A consistent description of scattering phenomena, focusing on aspects of spatial and time correlation will
be presented, based on the author’s scattering theory understanding and experimental practice. In classic
X-ray scattering experiment, time-averaged measurements are performed, we seek the spatial correlation
in the detected signal, in both wide- and small-angle X-ray scattering(WAXS/SAXS) geometry . An ex-
ample of crystallization behavior of propylene-1-butene(P-B) random copolymer under external field will
be given, illustrating how advanced X-ray scattering data analysis can help to understand polymorphism,
morphology and preferred orientation. On the other hand, laser source demonstrates excellent coherence
property which can be used to perform time-dependent measurements such as dynamic light scattering
(or photon correlation spectroscopy). In this case, we focus on intensity fluctuation induced by particle dif-
fusion. Recent progress on theory and instrumentation on a new technique, the photon cross-correlation
spectroscopy aimed at solving multiple scattering problem will be introduced. The presentation is based
on the research projects during the author’s graduate study. No attempt will be made to introduce all
specific details as individual case study, but the interrelationship among various experimental phenom-
ena will be stressed, demonstrating that many important concepts can be interpreted coherently under a
concrete framework.
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