Preparation of geometrically highly controlled Ga particle arrays on quasi-planar nanostructured surfaces as a SCALMS model system

Abstract

2D SCALMS model system preparation offering a high degree of geometric control of the Ga matrix particles by combination of nanostructured surfaces with independent adjustment of the substrates' surface chemistry in a thermal decomposition approach.

Gallium Nanoparticle Formation and Doping of Nanocrystalline Alumina from a Ga–Al Liquid Metal Hydrogen Generating Reaction

“…We propose Ga and Al nanoclusters can split water by polarizing the H–O–H bonds of H 2 O, resulting in new Ga–H and Al–OH bonds on the surface of the nanoclusters, analogous to the Al Lewis acid–base pair splitting of water previously reported. − Repetition of this process an additional two times can result in the formation of gallane (GaH 3 ) and Al­(OH) 3 . We suggest that Ga–H bonds of GaH 3 subsequently metathesize into Ga NPs and H 2 , as established in literature. − …”

Preparation and Surface Functionalization of a Tunable Porous System Featuring Stacked Spheres in Cylindrical Pores

“…Isoelectric Point Determination: The electrokinetic measurements were performed by the streaming current method in a setup similar to the ones described previously. [32,33] An asymmetric cell for this setup was manufactured out of PTFE (Auer Kunststofftechnik GmbH) with a nominal channel height of 0.3 mm. The measurement cell was symmetrically calibrated with a PTFE piece, and the asymmetrically measured data were evaluated according to the procedure reported by Walker et al [34] All streaming current measurements were performed at constant ionic strength (10 mM, KCl, Bi-oUltra, Merck) between pH 3 and pH 11 (HCl/KOH, Titrisol, Merck).…”

Highly Ordered Monolayers of μm-Sized Polystyrene Spheres Studied by Grazing-Incidence Small-Angle X-ray Scattering, Simulations, and Geometrical Calculations

“…12 For that purpose, the development and characterization of highly ordered 2D porous templates is the ultimate goal so that the catalyst activity of the deposited LMA droplets can easily be determined quantitatively by estimating the particle size and number density (per cm 2 ). 14 The local probing techniques such as scanning electron microscopy (SEM) and atomic force microscopy (AFM) are not well suited for determining the particle density on a macroscopic scale as their observation range is limited essentially to the micrometer scale (typically ∼100 μm × 100 μm). 15,16 Recently micro-and nanofocus scanning small-angle scattering (SAS) was used to probe the structure and orientation of thin soft materials; 17−19 however, those are limited to support materials sufficiently transparent with respect to the incident and scattered X-rays.…”

“…In contrast to conventional heterogeneous catalysts, in such systems, the typically highly selective catalytic reaction occurs only at the dynamic LMA/gas interface most probably by an isolated single atom emerging from the bulk phase at the LMA surface by diffusion: the fast dynamics of a single atom inside the liquid LMA phase protects the catalytically active cite from undesired deactivation and opens up the possibility of automated reactivation of their catalytic properties by diffusing between the surface and the bulk of the LMA droplet. , However, measuring the catalytic efficiency of a SCALMS catalyst quantitatively is difficult as the total surface of the catalytically active LMA particles accessible by the reactants is not well-known for real SCALMS systems . For that purpose, the development and characterization of highly ordered 2D porous templates is the ultimate goal so that the catalyst activity of the deposited LMA droplets can easily be determined quantitatively by estimating the particle size and number density (per cm 2 ) . The local probing techniques such as scanning electron microscopy (SEM) and atomic force microscopy (AFM) are not well suited for determining the particle density on a macroscopic scale as their observation range is limited essentially to the micrometer scale (typically ∼100 μm × 100 μm). , Recently micro- and nanofocus scanning small-angle scattering (SAS) was used to probe the structure and orientation of thin soft materials; − however, those are limited to support materials sufficiently transparent with respect to the incident and scattered X-rays.…”