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Showing 1 to 20 of 851 for “"hydroxyl"”.
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Hydroxyl radical additions to arenes
… processes, specifically via reactions with hydroxyl radicals (·OH), and the rate of that degradation, is of interest. Hydroxyl radicals are a major contributor to the breakdown of many contaminants in natural systems. The present study focused on measuring the product distributions from the …
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Hydroxyl functionalities of middle rank british coals
… and bench top derivatisation of the hydroxyl functionalities present in coal. These hydroxyl groups are predominantly in the form of hindered phenolic groups, with other alcoholic groupings being less important, in the coals studied here. Four different techniques were employed, three …
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Kinetic Studies of Hydroxyl and Hydrogen Atom Reactions
Gas phase kinetics of the reactions involving hydroxyl radical and hydrogen atom were studied using experimental and ab initio theoretical techniques. The rate constant for the H + H2S reaction has been measured from 298 to 598 K by the laser photolysis/resonance fluorescence (LP-RF) technique. The …
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Hydroxyl radical activity in bleached root-filled teeth
Aims to determine whether hydroxyl radicals are generated when hydrogen peroxide is used to bleach root-filled teeth which have been discoloured by blood components.
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Raman-Scattering From the Hydroxyl Ion in Alkali-Halides
Made available in DSpace on 2015-05-12T21:41:54Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7013307.PDF: 2659365 bytes, checksum: defbf62f5fdba09aa65489cbb2583700 (MD5) Previous issue date: 1969
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Raman scattering from the hydroxyl ion in alkali halides
"Raman scattering has been observed from the hydroxyl ion in NaCl, KCl. and KBr crystals. The measurements were made using an argon ion laser as a light source and a tandem double monochromator with photoelectric detection. The crystals were cleaved and mounted in such a way that the directions and …
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Dipole-Dipole Interactions in Alkali Halides Doped with Hydroxyl
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2011-06-10T16:27:13Z No. of bitstreams: 1 1981_potter.pdf: 3658463 bytes, checksum: 3b170f5a7503b36a6d1012bd8b556457 (MD5)
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Applications for the activation of hydroxyl groups to nucleophilic attack
… the applications of the activation of hydroxyl groups to nucleophilic attack within three key areas: Cyclic five-membered thionocarbamates bearing a N-Boc group undergo ring opening reactions at the 5-C with soft nucleophiles such as thiophenolate, pyridine-2-thiolate and potassium …
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The kinetics of hydrogen exchange between hydroxyl groups of alcohols
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemistry, 1960
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Hydroxyl Radical Production via Acoustic Cavitation in Ultrasonic Humidifier Systems
… of contaminants in water used in the systems. Hydroxyl radicals were found using DMPO as a spin trap. Caffeine and 17β-estradiol, as pharmaceutical contaminants of drinking water, were both emitted from the humidifier when present in the water reservoir and would enter breathing air. Emitted …
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Potential of Ozone and Hydroxyl Radicals to Degrade Emerging Organic Contaminants
… intensive.</p> <p>Previous research on ozone and hydroxyl radicals leads to the conclusion that they might be a vial option for advanced water treatment processes. To test the effects of ozone and hydroxyl radicals on the destruction of algae, ozonated phosphate buffer was mixed with Anabaena and …
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Hydroxyl-Radical Planar Laser-Induced Fluorescence Imaging of Turbulent Supersonic Combustion
… turbulent reacting flow from non-intrusive hydroxyl radical (OH) planar laser-induced fluorescence (PLIF) images are presented. The OH PLIF images show instantaneous structures of turbulence in two combustor configurations at different fuel equivalence ratios in the University of Virginia …
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Raman measurements on the hydroxyl ion in several alkali-halide crystals
"Raman measurements were made on several a1ka1i""""ha1ide crystals containing OH- impurity between 2 K and 300 K. An argon laser was used as the source of excitation. Filtration of the scattered light provided by -1 an iodine cell permitted direct observation of the spectra below 40 cm for the …
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Hydroxyl radical production via the photo-Fenton reaction in natural waters
This dissertation investigates the importance of photo-Fenton chemistry in natural waters. The Fenton reaction, H202 + Fe(ll) [right arrow] Fe(ll) + OH- + OH', can occur in sunlit waters because both H202 and Fe(ll) are photo-chemically produced. Photo-Fenton chemistry was investigated by …
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Near Infrared Absorption Bands of the Hydroxyl Ion in Alkali-Halide Crystals
Made available in DSpace on 2015-05-12T21:41:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6801880.PDF: 2794999 bytes, checksum: efd2c87f4a26755cda473293c629510a (MD5) Previous issue date: 1967
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Near infrared absorption bands of the hydroxyl ion in alkali halide crystals
… from 1.4~ to 380 oK. Energy levels of the hydroxyl dipole in the crystal lattice were determined from the spectra. The crystals were grown by the Czochra1ski m~thod in a purified argon atmosphere. The spectra were measured with a spectrophotometer assembled from connnercially available …
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An ultrasonic study of hydroxyl ion in single crystals of rubidium chloride
Ultrasonic measurements o~ absorption and velocity changes of sound waves on single crystals of RbCl containing OH ions were made as a function of polarization, frequency, concentration and temperature from 0.6 K to 24 K. A rise in absorption of the low frequency (10 to 70 MHz) Cmode sound waves …
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