Synthesis of Supported Ga Nanodrops by a Bottom‐up Route

Abstract

Nanoparticulate gallium can be obtained in an unconfined state by reduction of gallium-acetylacetonate with LiAlH4. The products were analyzed by scanning electron microscopy, elemental analysis together with X-ray diffraction, and thermal analysis. EXAFS investigations reveal, in accordance with the results from thermal analyses, that the particles are liquid at room temperature. The reason for the lower melting point could not be clarified within this study and might be caused either by the lower melting point of -gallium or by the small particle size of 10-20 nm. Upon cooling, several of the low-temperature modifications of gallium are observed depending on cooling-rate and temperature

Intermetallic GaPd2 Nanoparticles on SiO2 for Low-Pressure CO2 Hydrogenation to Methanol: Catalytic Performance and In Situ Characterization

“…The acquired XRD patterns do not show distinct reflections, which can be assigned to SiO 2 , metallic Ga or Gallium oxides. This indicates such phases to be noncrystalline or liquid . The absence of Ga-compounds in the X-ray patterns could be attributed to the formation of highly dispersed Ga 2 O 3 species upon calcination, which are further reduced on the surface of the Pd at elevated temperatures.…”

“…This indicates such phases to be noncrystalline or liquid. 48 The absence of Ga-compounds in the X-ray patterns could be attributed to the formation of highly dispersed Ga 2 O 3 species upon calcination, which are further reduced on the surface of the Pd at elevated temperatures. A similar mechanism has been suggested in ref 33, where Ga 3+ species are claimed to be reduced on Pd nanoparticles by the highly active hydrogen atoms contained in the form of palladium hydride.…”