1,720,987 research outputs found
Inhibition of Cor-Ten steel corrosion by “green” extracts of Brassica campestris
No full textExtract of Brassica campestris was tested as potential corrosion inhibitor for Cor-Ten steel in NaCl and acidic solutions, simulating a marine and an urban-industrial environment, respectively. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were performed both in absence and in presence of the extract at room temperature. The surface chemical analysis was investigated by X-ray Photoemission Spectroscopy (XPS), before and after corrosion. Electrochemical results demonstrated that a very small concentration of Brassica campestris extracts can inhibit Cor-Ten corrosion in NaCl solution (inhibition efficiency of 80-84%) better than in acidic solutions. Surface analysis results confirmed these good results
Low-temperature adsorption states of benzene on Si(111)7x7 studied by synchrotron-radiation photoemission
No full textXPS Characterization of biocompatible hydroxyapatite-polymer coatings
No full textHydroxyapatite coatings on polymeric substrates have been prepd. by treating samples of poly(Me methacrylate) (PMMA) and poly(2-hydroxyethyl methacrylate) with a biomimetic method and by producing a mech. mixt. of polymers, PMMA and poly(2-hydroxyethyl methacrylate) and hydroxyapatite (1:1). The surface chem. compn. of the samples has been studied by using XPS. Both the ref. polymers and the hydroxyapatite coatings have been analyzed. The surface modifications induced by interaction of the coatings with osteoblast cells have been studied as a function of the exposure time, after in vitro treatment for 7, 15 and 21 days. Quant. XPS anal. enabled us to compare the quality of the samples and the different response to the in vitro treatment
SYNTHESIS, CHARACTERIZATION AND CATALYTIC PROPERTIES OF GOLD NANOPARTICLES SUPPORTED ON CERIA
No full textXPS Characterization of biocompatible hydroxyapatite-polymer coatings
No full textHydroxyapatite coatings on polymeric substrates have been prepd. by treating samples of poly(Me methacrylate) (PMMA) and poly(2-hydroxyethyl methacrylate) with a biomimetic method and by producing a mech. mixt. of polymers, PMMA and poly(2-hydroxyethyl methacrylate) and hydroxyapatite (1:1). The surface chem. compn. of the samples has been studied by using XPS. Both the ref. polymers and the hydroxyapatite coatings have been analyzed. The surface modifications induced by interaction of the coatings with osteoblast cells have been studied as a function of the exposure time, after in vitro treatment for 7, 15 and 21 days. Quant. XPS anal. enabled us to compare the quality of the samples and the different response to the in vitro treatment
Synchrotron radiation-induced photoemission study at high resolution of ethylene on Si(100)2x1
No full textOrganic films for the conservation of archaeological artefacts in bronze: evaluation of corrosion protection by surface analytical techniques
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