Silica has many industrial (ie, glass formers) and scientific applications. The understanding
and prediction of the interesting properties of such materials are dependent on the …

Combining X-ray diffraction, NMR (CP-MAS and 29Si NMR-MAS) and diffuse reflectance
infra-red Fourier transformed spectroscopy (DRIFTS), the local structural changes induced …

Synthetic opals, a composition of homogeneous silica spheres in the mesoscale size range,
have attracted the attention of scientists due to their favorable chemical and physical …

This paper sets out to acquire information on the atomic structure of the alkali-silica reaction
gel by using the x-ray absorption fine structure (XAFS) technique to improve the …

Si 29 MAS NMR spectroscopy was employed for the evaluation of the alkali-silica reaction
(ASR) in laboratory and field concrete specimens. A series of NMR data was collected on …

This work reports medium-and short-range order of changes of amorphous silica submitted
to chemical degradation. Structural changes were studied, using X-ray absorption near edge …

A multi-technique and multi-scale approach have been initiated to study the structural
properties of a natural heterogeneous material. This approach has led us to introduce the …

Micro X-ray absorption near edge structure XANES and micro fluorescence experiments
have been carried out using X-ray microbeam from synchrotron radiation source with high …

The durability of SiO 2 compounds is closely related to its structural properties. In this work
three natural siliceous aggregates (called G1, G2 and G3) are studied. Improvement of the …

Significant progress was achieved with the application of Rietveld method to characterize
the crystalline, and nanocrystalline phases in portland cement concrete. However, to obtain …