Colloidal crystallization and structural changes in suspensions of silica/magnetite core-shell nanoparticles.
The microradian X-ray scattering technique is used to investigate the colloidal crystallization of silica/magnetite core-shell magnetic nanoparticles. Particle self-assembly ranging from 2D sheets to 3D semicrystalline structures is observed as a function of the sedimentation-induced variation of the local particle concentration and the applied magnetic field. Because the particle size is comparable to the wavelength of light, these structures possess photonic properties that can be manipulated by an external stimulus.
Physics Department, University of Wisconsin-Milwaukee, 1900 E. Kenwood Blvd., Milwaukee, Wisconsin 53211, USA. malik@uwm.edu
Vikash
V
Malik
Andrei V
AV
Petukhov
Le
L
He
Yadong
Y
Yin
Marius
M
Schmidt
D003102:Colloids / Q000737:chemistry; D003460:Crystallization; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D015394:Molecular Structure; D012542:Scattering, Radiation; D012822:Silicon Dioxide / Q000737:chemistry*; D013535:Suspensions / Q000737:chemistry; D014965:X-Rays
D003102:Colloids; D058185:Magnetite Nanoparticles; D013535:Suspensions; D012822:Silicon Dioxide