Iron-Based Nanopowders Containing α-Fe, Fe₃C, and γ-Fe Particles Synthesised in Microwave Torch Plasma and Investigated with Mössbauer Spectroscopy

Abstract

We show that the RST model describing the exactly soluble black hole model can have a dynamical wormhole solution along with an appropriate boundary condition. The necessary exotic matter which is usually negative energy density is remarkably produced by the quantization of the infalling matter fields. Then the asymptotic geometry in the past is two-dimensional anti-de Sitter (AdS 2 ), which implies the exotic matter is negative. As time goes on, the wormhole eventually evolves into the black hole and its Hawking radiation appears. The throat of the static RST wormhole is lower-bounded but in the presence of infalling matter it collapses to a black hole.

Hydrophobic Fe‐Based Catalyst Derived from Prussian Blue for Enhanced Photothermal Conversion of Syngas to Light Olefins

“…Furthermore, two additional diffraction peaks centered at 42.9° and 49.8° indicate the presence of γ ‐Fe (PDF#52‐0513). [ 23 ] The rest diffraction peaks in Fe/Fe 3 C catalyst patterns correspond to the orthorhombic Fe 3 C (PDF#65‐2411). The Fe/Fe 3 C‐c catalyst obtained after organic modification shows similar diffraction peaks in the XRD pattern as the Fe/Fe 3 C catalyst including graphitic carbon, α ‐Fe, γ ‐Fe, and orthorhombic Fe 3 C. Figure 2b elucidates the Raman spectra of the obtained samples.…”

Carbon nanotubes derived from waste cooking oil for the removal of emerging contaminants

“…47 Finally, it was possible to identify the presence of the γ-Fe(C) phase, in which austenite is in solution with carbon, associated with a singlet with an isomeric shift of 0.01 mm s −1 . 51…”