A methodology for structurally representing the molecules of three Colombian vacuum residues (538+ °C) and one Mexican atmospheric residue (300+ °C) is reported. Information obtained by Fourier transform ion cyclotron resonance mass spectrometry coupled to positive electrospray i...
Autor(es): Enrique Mejia.
Raman spectroscopy generates a large volume of information at the molecular level of crude oils, which processed using chemometric methods allows building models to predict their physicochemical properties, facilitating to make decisions in refining processes for obtain high-valu...
Autor(es): Enrique Mejia.
Bioactive hydroxyapatite (HA) coatings were fabricated by a precipitation, sol-gel and dip-coating method. The effects of the aging time and the base used to adjust pH and substrate materials on the phases and microstructures of HA coatings were studied by field emission scanning...
Autor(es): Enrique Mejia.