KSCN and phenylalanine are encapsulated with nanoscale hollow spheres acting as containers. These hollow spheres, composed of Au, CuS, AlO(OH), or SnO2, and can be prepared using a microemulsion technique, and yield particles with outer diameters of 15–30 nm and wall thicknesses of 2–10 nm.
ZrO 2 , CaCO 3 , and Fe 4 [Fe(CN) 6 ] 3 hollow nanospheres are prepared via gelatin-stabilized microemulsions. ZrO 2 and CaCO 3 hollow spheres exhibit outer diameters of 10-20 nm, a thickness of the sphere wall of 4 nm and an inner cavity diameter of 6-12 nm; Fe 4 [Fe(CN) 6 ] 3 is with outer diameters of 50-60 nm, a wall thickness of 15 nm, and an inner cavity diameter of 25-30 nm. The hollow nanospheres turn out as readily crystalline although prepared at roomtemperature. Gelatin increases the viscosity of the polar micelle phase and thereby reduces the diffusion in the water phase. This measure is essential to obtain hollow spheres and to avoid the formation of massive nanoparticles. All as-prepared hollow nanospheres are charac-* Prof. Dr. C. Feldmann E-Mail: claus.feldmann@kit.edu [a]
AgSCN nanoparticles were prepared via a water-in-oil microemulsion approach, using KSCN and AgNO 3 as starting materials. The as-prepared AgSCN nanoparticles are readily crystalline, exhibit a uniform spherical shape, and have a mean diameter of 25 nm. Scanning electron microscopy (SEM) and dynamic light scattering (DLS) confirm particle size and size distribution. X-ray powder diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) prove the * Prof. Dr. C. Feldmann E-Mail: claus.feldmann@kit.edu [a]
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