Scattering in the Elastic and Quasi-Elastic Regimes

Yimin Mao (Materials Science and Engineering Department, Georgia Institute of Technology)

Static and dynamic aspects of a scattering experiment will be explored by using two examples. In the first example, synchrotron-based X-ray scattering (wide- and small-angle) was utilized to study crystallization behavior of a kind of random copolymer, poly(propylene-ran-butylene) (P-B) influenced by shear flow or uniaxial tensile force. It will be demonstrated that how one can benefit from 2D whole pattern analysis to understand polymorphism, preferred orientation, and morphology in anisotropic systems. In the second example, photon cross-correlation technique, which is able to minimize multiple scattering in concentrated solution will be introduced to demonstrate the usefulness of working in the quasi-elastic regime, to study colloidal/polymer/biomolecular dynamics. Analogy among different probes using visible light, X-ray and neutron scattering will be exfoliated. Opportunities of combining these tools to achieve simultaneous multi-scale characterization will be discussed.

Back to Seminar Home Page

Last modified 06-May-2014 by website owner: NCNR (attn: )