Small-angle neutron scattering investigations of Co-ferro-fluids using polarized neutrons.

A. Wiedenmann

Hahn-Meitner-Institut Berlin, Glienickerstrasse 100, D-14109 Berlin, Germany

Abstract
Using polarized neutrons, the relative contrasts for small angle scattering are strongly modified which allows a precise evaluation of magnetization, density and composition profiles at surfaces and interfaces of nanoscaled materials. In Co-ferrofluids the magnetic core behaves as a non-interacting single-domain. The core is encapsulated by a shell of surfactant molecules which was found to be impenetrable for the solvent. Tables 1, Figs 3, Refs 7.