Current Search: Aluminum coating (x)
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Title
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Investigation of dynamically coated alumina stationary phases for reversed-phase high-performance liquid chromatography.
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Creator
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Ferguson, Veronica, Florida Atlantic University, Haky, Jerome E.
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Abstract/Description
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Dynamically coated alumina (DCA) was prepared by pumping mobile phase containing methanol and concentration of 10mM Sodium Lauryl Sulphate (SLS), an anionic surfactant prepared in water, through a bare alumina column. The mechanism of separation of a test mixture were characteristic of reversed phase chromatography as evident in the decreased retention time as the percentage of methanol increased. However, the effects of changing the pH of the mobile phase on retention of solutes were...
Show moreDynamically coated alumina (DCA) was prepared by pumping mobile phase containing methanol and concentration of 10mM Sodium Lauryl Sulphate (SLS), an anionic surfactant prepared in water, through a bare alumina column. The mechanism of separation of a test mixture were characteristic of reversed phase chromatography as evident in the decreased retention time as the percentage of methanol increased. However, the effects of changing the pH of the mobile phase on retention of solutes were different than that expected in reversed phase separations, indicating the presence of another retention mechanism. Excellent resolutions, peak shapes and peak symmetries were obtained using the DCA conditions and were comparable to similar separations performed on an ODA (octadecylalumina) column. Comparisons of retentions of a variety of organic compounds on DCA with those of commercial ODS (octadecylsilica) and ODA phases were also performed.
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Date Issued
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1999
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PURL
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http://purl.flvc.org/fcla/dt/15673
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Subject Headings
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High performance liquid chromatography, Aluminum coating
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Format
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Document (PDF)
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Title
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Evaluation of corrosion behavior of ion vapor deposited aluminum related coating systems.
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Creator
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Hang, Ling., Florida Atlantic University, McIntyre, Jack F.
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Abstract/Description
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Experiments were conducted to investigate the effectiveness of ion vapor deposited (IVD) aluminum as a base coat for polyurethane topcoat systems in marine environments. Three test environments were used including marine atmospheric atmosphere, quiescent filtered seawater open to laboratory air and aerated seawater. Visual observation and electrochemical impedance spectroscopy techniques were primary testing methods; other characterizations included adhesion tape test, coating thickness...
Show moreExperiments were conducted to investigate the effectiveness of ion vapor deposited (IVD) aluminum as a base coat for polyurethane topcoat systems in marine environments. Three test environments were used including marine atmospheric atmosphere, quiescent filtered seawater open to laboratory air and aerated seawater. Visual observation and electrochemical impedance spectroscopy techniques were primary testing methods; other characterizations included adhesion tape test, coating thickness measurements, holiday detection, optical microscopy, open circuit potential measurements and potentiodynamic polarization. It was found that IVD aluminum was a good candidate for replacement of environmentally sensitive coatings on AA2219-T87 and AISI 4340 steel substrates, respectively. The IVD aluminum coating provided good sacrificial protection and served as a good base for polyurethane topcoat systems. Electrochemical impedance spectroscopy was a suitable method to predict coating performance in the early stages of exposure.
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Date Issued
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1993
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PURL
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http://purl.flvc.org/fcla/dt/14970
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Subject Headings
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Aluminum coating, Corrosion and anti-corrosives, Metals--Corrosion fatigue, Electrochemical analysis
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Format
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Document (PDF)
