New route to nanocrystal synthesis: galvanic replacement

All change for nanocrystals.
Maria Ibáñez and Andreu Cabot
Science 340, 935 (2013)

Galvanic Replacement Reactions in Metal Oxide Nanocrystals.
Myoung Hwan Oh, Taekyung Yu, Seung-Ho Yu, Byungkwon Lim, Kyung-Tae Ko,Marc-Georg Willinger, Dong-Hwa Seo, Byung Hyo Kim, Min Gee Cho, Jae-Hoon Park, Kisuk Kang, Yung-Eun Sung, Nicola Pinna, Taeghwan Hyeon
Science 340, 964 (2013)

Schematic illustration of the transformation of Mn3O4 NCs, showing the evolution of their morphology via the localized dissolution of Mn3O4 and the surface precipitation of g-Fe2O3. (B to E) HRTEM images of the hollow nanostructures synthesized by the reaction of Mn3O4 NCs with 1 ml of aqueous solutions of iron(II) perchlorate having different concentrations.

Magnetic and structural order in Mn3O4

Pressure and field tuning the magnetostructural phases of Mn3O4: Raman scattering and x-ray diffraction studies.
M. Kim, X. M. Chen, X. Wang, C. S. Nelson, R. Budakian, P. Abbamonte, and S. L. Cooper
Phys. Rev. B 84, 174424 (2011)

Contour plots of the T2g(1) phonon mode intensities as functions of energy and field (e) Illustrations of theMn3O4 structure in (I) the orthorhombicwithmagnetic easy axis along [110], (II) tetragonal, and (III) orthorhombic structure of Mn3O4 with magnetic easy axis along [110]. (f) H-T phase diagram.