Abstract
The spin-contrast-variation neutron reflectometry technique was developed for the structural analysis of multilayer films. Polarized-neutron reflectivity curves of film samples vary as a function of their proton polarization (P
H). The P
H-dependent reflectivity curves of a polystyrene monolayer film were precisely reproduced using a common set of structural parameters and the P
H-dependent neutron scattering length density of polystyrene. This result ensures that these curves are not deformed by inhomogeneous P
H but can be used for structural analysis. Unpolarized reflectivity curves of poly(styrene-block-isoprene) films were reproduced using a flat free-surface model but P
H-dependent polarized reflectivity curves were not. The global fit of the P
H-dependent multiple reflectivity curves revealed that holes with a depth corresponding to one period of the periodic lamellae of microphase-separated polystyrene and polyisoprene domains were produced on the surface of the films, which agrees with the microscopic results. In this manner, the spin-contrast-variation neutron reflectometry technique determines the structure of multiple surfaces and interfaces in a film sample while excluding the incorrect structure that accidentally accounts for a single unpolarized reflectivity curve only.
Funder
Ministry of Education, Culture, Sports, Science and Technology, Japan
Publisher
International Union of Crystallography (IUCr)
Subject
General Biochemistry, Genetics and Molecular Biology
Reference35 articles.
1. Abragam, A. (1961). Principles of Nuclear Magnetism. Oxford: Clarendon Press.
2. Principles of dynamic nuclear polarisation
3. Optimizing dissolution dynamic nuclear polarization
4. Brandrup, J., Immergut, E. H. & Grulke, E. A. (1999). Polymer Handbook, 4th ed. New York: Wiley-Interscience.
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献