Edward Navarre

Southern Illinois University Edwardsville | SIUE · Department of Chemistry

The emission properties of “cool” and “warm” white light-emitting diodes were studied in the context of low-cost spectrophotometry. The suitability of pulse-width modulation as a method to control the diode brightness was examined. Both types of light-emitting diode demonstrated emission standard deviation minima at a pulse-width modulation frequen...

available at: https://spark.siue.edu/siue_fac/141/ A simple computer interface for controlling a compact spectrograph for use as a spectrophotometer in an undergraduate teaching laboratory was developed. The project was implemented on a Raspberry Pi computer which permits the integration of a light source into the software. The interface was writt...

Available at: https://ilarchsurv.org/IAoutofprint This research examines the potential for determining the source of clays used in the produc-tion of prehistoric ceramics from the American Bottom and Illinois Valley through infrared (IR) microscopy. IR microscopy was employed to measure the composition of reference clays and prehistoric sherds over...

available at: https://spark.siue.edu/siue_fac/142/ A nonequilibrium approach to voltamperometric temperature measurement for tungsten filament atomizers was developed to facilitate the transfer of thermal conditions between instruments that possess different power supply regulation modes and filaments. Large differences in the equilibrium and insta...

A method suitable for the field determination of lead-containing paint by atomic absorption was developed. N-Methyl pyrrolidone (NMP) was used as a pretreatment to soften the paint samples. No heating, mechanical grinding, or other chemical treatments were necessary prior to final sample dilution. Addition of 2% nitric acid was sufficient to dissol...

A new atomization device for direct atomic spectrochemical analysis has been developed that uses the theta-pinch configuration to generate a pulsed, high-energy-density plasma at atmospheric pressure. Energy from a 20-kV, 6.05-μF capacitive electrical discharge was inductively coupled to a sacrificial aluminum thin film to produce a cylindrical pla...

The interaction between peracetylated-β-cyclodextrin and tert-butyl and adamantyl functionalized triphenylphosphine derivatives was studied in supercritical carbon dioxide (scCO2) based solvent media by UV–vis spectroscopy. The equilibrium constant for a 1:1 complexation reaction was obtained from titration spectra both in pure carbon dioxide and i...

The supramolecular chemistry of peracetylated-β-CD (perAc-β-CD) as a host for triphenyphosphine derivatives has been studied in supercritical (scCO2) using UV absorption spectroscopy. It was found that the association constant in scCO2 at 40°C and 300 bar is 10 to 1000 times smaller compared to analogous systems in aqueous solvent. Studies of the t...

The interaction between peracetylated beta-cyclodextrin and several triphenyl phosphine derivatives was studied in supercritical carbon dioxide (scCO2) by UV-visible spectroscopy. The equilibrium constant for a 1:1 complexation reaction was obtained from titration spectra and calculated using two established mathematical models. The values of the e...