Single‐Crystalline Hollow Face‐Centered‐Cubic Cobalt Nanoparticles from Solid Face‐Centered‐Cubic Cobalt Oxide Nanoparticles

Abstract

Hollow nan': Hollow face‐centered cubic (fcc) Co nanoparallelepipeds were prepared by thermolysis of solid fcc CoO nanoparallelepipeds in oleylamine (see TEM image). The solid fcc CoO nanoparallelepipeds are reduced by the oleylamine surfactant to form hollow fcc Co nanoparallelepipeds. Voids and fcc Co are generated on the surface of the solid fcc CoO nanoparallelepipeds by the removal of oxide as carbon monoxide.

Co–N–C supported on SiO2: a facile, efficient catalyst for aerobic oxidation of amines to imines

“…Two fringes spacing of 0.205 nm corresponding to the (111) plane of Co 0 in HRTEM image of Co-N-C/ SiO 2 were observed ( Fig. 2b, inset), 16 the Co 0 appeared to be ne particles with size of about 5 nm and was well dispersed on the surface of silica (small dark dots in Fig. 2b).…”

Nanoparticulate Functional Materials

“…Obviously, the arrangement and form of the nanoparticles play a decisive role here. Thus T B rises with a chain-like arrangement of superparamagnetic g-Fe 2 O 3 nanoparticles from 80 K to about 120 K. [171] Cobalt particles with a hollow spherical structure even have a T B of 180 K. [172] Suspended in highly viscous fluids, superparamagnetic nanoparticles are used as a magnetic fluid or ferrofluid ( Figure 26). [173] Such ferrofluids can be manipulated in a variety of ways by external magnetic fields.…”

Nanopartikuläre Funktionsmaterialien

“…Offensichtlich spielen Anordnung und Morphologie der NPs hierbei eine entscheidende Rolle. So steigt T B bei kettenförmiger Anordnung superparamagnetischer g-Fe 2 O 3 -NPs von 80 K auf etwa 120 K. [171] Cobalt-Partikel mit Hohlkugelstruktur zeigen sogar eine T B von 180 K. [172] Suspendiert in hochviskosen Flüssigkeiten finden superparamagnetische NPs Anwendung als magnetische Flüssigkeit bzw. Ferrofluid (Abbildung 26).…”