Solid-state nuclear magnetic resonance (NMR) was also used to elucidate the silica nanostructures. A comparison of the EELS spectra revealed varying spectral features in the peak edges with different reaction times due to the interaction evolution between oxygen and the silicon and OH ions. A broad diffuse peak observed in the XRPD pattern showed a shift toward higher angles following the higher reaction times of the ASR-treated material. All of the studied samples were found to be amorphous, as observed by HRTEM, a fact that was also confirmed by XRPD and e-PDF analysis.
An increase in the size of the amorphous silica nanostructures and nanopores was observed by HRTEM, which was accompanied by the possible formation of Si–OH surface species. In this work, amorphous silica subjected to an accelerated alkali silica reaction (ASR) was recorded at different time intervals so as to follow the evolution of the structure by means of high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), and electron pair distribution function (e-PDF), combined with X-ray powder diffraction (XRPD). The understanding and prediction of the interesting properties of such materials are dependent on the knowledge of detailed atomic structures.
Food Additive Silica Gel is a light powder that is often used as a food additive as an anti-caking agent. Amorphous silica gel basically looks like white powder, similar in consistency to a fine sand.
Silica has many industrial (i.e., glass formers) and scientific applications. The word Amorphous means that the silica gel does not have a clearly defined shape or form and is not a crystal-like salt.
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