"Study of Nanostructure of Soft Matters by Small-Angle X-ray Scattering (SAXS)”

Yoshiyuki Amemiya
Department of Advanced Materials Sciences School of Frontier Sciences
Univ. of Tokyo

Abstract:
Small-angle x-ray scattering is a powerful technique to investigate in-situ nano-structure of materials. When this technique is combined with a synchrotron x-ray radiation source which provides much more intense and directional x-ray beam than conventional x-ray source, it also allows us to investigate the heterogeneity of nano-structure with a scanning micro-sized x-ray beam (scanning microbeam SAXS) and the time evolution of nano-structure by pursuing time-resolved measurements (time-resolved SAXS). In addition, when SAXS is combined with ultra small-angle X-ray scattering (USAXS) and wide-angle x-ray scattering (WAXS), hierarchical structure of materials ranging from subnano-, nano- to micron-structure can be investigated based on scattering over a wide q range.

In this talk, the above techniques and their applications to soft matters as follows will be presented.

(1) Co-existing handednesses of lamella twisting in one spherulite observed with scanning microbeam WAXS [1]

(2) Analysis of bilateral structure of a single wool and hair fiber observed with scanning microbeam SAXS [2]

(3) Transient rotator phase of n-hexadecane in emulsified droplets observed with time-resolved simultaneous SAXS/WAXS [3]

(4) Time evolution of filler aggregates in rubber under elongation with time-resolved USAXS/SAXS/WAXS[4]

(5) Structural change of the slide-ring gel under elongation with SAXS

1. Y. Nozue S.Hirano, R.Kurita, N.Kawasaki, S.Ueno, A.Iida, T.Nishi & Y.Amemiya, Polymer, 45, 8299 (2004).
2. Y. Kajiura S.Watanabe, T.Itou,A.Iida, Y.Shinohara & Y.Amemiya, J. Applied Crystallography, 38, 420 (2005).
3. Y. Shinohara N.Kawasaki, S.Ueno, I.Kobayashi, M.Nakajima & Y.Amemiya, Phys. Rev. Lett. 94, 97801 (2005).
4. Y.Shinohara, H.Kishimoto and Y.Amemiya, Spring-8 Research Frontiers 2004, 88 – 89 (2005)