13 research outputs found
Correct quantum chemistry in a minimal basis from effective Hamiltonians
We describe how to create ab-initio effective Hamiltonians that qualitatively
describe correct chemistry even when used with a minimal basis. The
Hamiltonians are obtained by folding correlation down from a large parent basis
into a small, or minimal, target basis, using the machinery of canonical
transformations. We demonstrate the quality of these effective Hamiltonians to
correctly capture a wide range of excited states in water, nitrogen, and
ethylene, and to describe ground and excited state bond-breaking in nitrogen
and the chromium dimer, all in small or minimal basis sets
Sol-gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel
Objectives: This study was carried out in order to establish the potential offered by the sol-gel method to obtain Titanium/
Bismuth oxide coatings on 316L Stainless Steel (SS) substrates in biocompatibility applications. Methods/Analysis: The
stable sol was synthesized by using Bismuth nitrate (III) pentahydrate and Titanium (IV) butoxide. The coatings were
deposited by spin-coating technique at 4000 rpm and characterized topographically by Scanning Electron Microscopy
SEM and structurally by X-ray diffraction XRD. Through the techniques of polarization potentiodynamic curves and
Electrochemical Impedance Spectroscopy (EIS), the anticorrosive response of the �ilms was evaluated. The thickness was
then measured, and biocompatibility test was developed. Findings: It was found that the coatings with high composition of
the precursor titanium (IV) butoxide offer the best results as an anticorrosive application. Likewise, the growth of cells was
uniform on the �ilms indicating that the medium offered by the �ilms does not present active cytotoxicity and surpasses by
a large number the cellular growth level compared to stainless steel. Applications /Improvement: 316L (SS) is very useful
in implantology, for its low cost compared with other materials. The implanted steel suffers corrosion by the physiological
�luids of body. Titanium/Bismuth coatings establish a barrier between body �luids and SS implant