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You searched for: Subject term electron paramagnetic resonance spectroscopy Remove constraint Subject term: electron paramagnetic resonance spectroscopy
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1. Naturally Occurring Electron Paramagnetic Resonance in Wool

Author:
J.J. Windle
Source:
Textile research journal 1962 v.32 no.12 pp. 963-965
ISSN:
0040-5175
Subject:
electron paramagnetic resonance spectroscopy; fabrics; silk; textile fibers; wool
Abstract:
... A naturally occurring electron resonance. spectrum has been detected in raw wool and in exhaustively scoured wool fibers and cloth. A similar resonance has been found in silk fibers. These spectra consist of a single line about 10 gauss wide centered at g = 2.003. Paramagnetic impurities in wool give rise to another much broader resonance which varies in intensity, g-value. and line width. The ori ...
DOI:
10.1177/004051756203201201

2. ESR Spectra of Gamma-Irradiated Cotton Cellulose I and II

Author:
Jett C. Arthur; Trinidad Mares; Oscar Hinojosa
Source:
Textile research journal 1966 v.36 no.7 pp. 630-635
ISSN:
0040-5175
Subject:
cellulose; cobalt; cotton; electron paramagnetic resonance spectroscopy; fabrics; free radicals; gamma radiation; hydrogen; hydrogen bonding; irradiation; oxygen; textile fibers
Abstract:
... Irradiation of purified fibrous cotton cellulose I and cotton cellulose II (mercerized) with γ-radiation from Co"" gave products containing relatively stable free radicals, easily shown in electron spin resonance (ESR) spectra. The ESR spectrum of irradi ated cellulose I consisted ,of three, lines, and the spectrum of irradiated cellulose II consisted of five lines. The principal lines of both spe ...
DOI:
10.1177/004051756603600707

3. Effects of Light on the ESR Spectra of Dyed Cottons

Author:
Peter J. Baugh; Oscar Hinojosa; Trinidad Mares; Milton J. Hoffman; Jett C. Arthur
Source:
Textile research journal 1967 v.37 no.11 pp. 942-947
ISSN:
0040-5175
Subject:
cellulose; copper sulfate; cotton; depolymerization; dyes; electron paramagnetic resonance spectroscopy; energy; fabrics; free radicals; irradiation; naphthols; solar radiation; sulfur; textile fibers; yarns
Abstract:
... It was demonstrated, by using electron spin resonance (ESR) 'methods, that free radicals are produced in purified and dyed cotton celluloses by the action of light. Cottons were dyed with 24 different dyestuffs selected from eight broad classifications: direct dyes (either low or high in light-fastness; after-treated with CuSO ₄ or diazotized and developed), soluble ester vat dyes, and vat dyes ap ...
DOI:
10.1177/004051756703701106

4. Electron-spin resonance study of some irradiated d-glucopyranosides

Author:
Sarkar, Ila M.; Arthur, Jett C. Jr.; Hinojosa, Oscar
Source:
Carbohydrate research 1968 v.6 no.3 pp. 333-340
Subject:
deformation; glycosidic linkages; dietary carbohydrate; glucosides; oxidative stability; electron paramagnetic resonance spectroscopy; hydrogen bonding; food irradiation; gamma radiation
Abstract:
... The e.s.r. spectra generated in methyl α-D-glucopyranoside (1) and some selected derivatives thereof by high-energy radiation have been examined to determine the nature of the radiation damage. Evaluations of the e.s.r. spectra of irradiated methyl tetra-O-acetyl-α-D-glucopyranoside (2), methyl tetra-O-[(p-ethoxycarbonyl)benzoyl]-α-D-glucopyranoside (3), methyl tetra-O-(p-methoxybenzoyl)-α-D-gluco ...
Handle:
10113/36371
DOI:
10.1016/S0008-6215(00)81455-X

5. Studies in Wool Yellowing : Part XXII: ESR Investigations of the Action of UV Radiation

Author:
I.H. Leaver
Source:
Textile research journal 1968 v.38 no.7 pp. 729-734
ISSN:
0040-5175
Subject:
disulfide bonds; electron paramagnetic resonance spectroscopy; fabrics; fluorescence; formaldehyde; free radicals; irradiation; photosensitivity; reflectance spectroscopy; spectral analysis; textile fibers; thiourea; ultraviolet radiation; wavelengths; wool
Abstract:
... A study has been made of the photo-induced free radicals in thiourea/formaldehyde- treated wool and fluorescent-brightened wool after exposure to near uv radiation in the wavelength region 2900-4000 A, and the results are compared with the observed changes in the electronic absorption spectra. Thiourea/formaldehyde treatment of wool significantly protects cystyl residues from disulfide bond ruptur ...
DOI:
10.1177/004051756803800708

6. An Electron Spin Resonance Study of the Copper (II) Interaction with Wool-Keratin : Part I : An Interpretation and the Properties of a Copper (II)/Wool ESR Spectrum

Author:
S. Kokot; M. Feughelman; R.M. Golding
Source:
Textile research journal 1972 v.42 no.12 pp. 704-708
ISSN:
0040-5175
Subject:
copper; electron paramagnetic resonance spectroscopy; fabrics; moieties; pH; textile fibers; wool
Abstract:
... The esr spectrum observed from a wool sample treated in a copper (II) solution in the pH range of 1.5 to 5.0 was inter preted by assuming two paramagnetic species each with an effective spin S=1/2. The interaction giving rise to this esr spectrum was ascribed to the complex formation between Cu(II) and the free carboxyl groups in the wool. ...
DOI:
10.1177/004051757204201203

7. Electron Spin Resonance Spectrometry of Humic Substances

Author:
R. Riffaldi; M. Schnitzer
Source:
Soil Science Society of America journal 1972 v.36 no.2 pp. 301-305
ISSN:
0361-5995
Subject:
absorbance; color; electron paramagnetic resonance spectroscopy; free radicals; fulvic acids; fungi; humic acids; methylation; provenance; soil
Abstract:
... Concentrations of free radicals, g-values, and line widths were determined for humic acids, fulvic acids, and humins originating from soils of widely differing geographical origins and pedological histories and for humic acids synthesized by fungi in the laboratory. Free radical content decreased in the following order: humins > humic acids > fulvic acids. Line widths decreased in the order: fulvi ...
DOI:
10.2136/sssaj1972.03615995003600020028x

8. Morphology and Properties of Crystalline Polymers with Fiber Structure

Author:
A. Peterlin
Source:
Textile research journal 1972 v.42 no.1 pp. 20-30
ISSN:
0040-5175
Subject:
anisotropy; compliance; crystals; electron microscopy; electron paramagnetic resonance spectroscopy; fabrics; mechanical properties; models; modulus of elasticity; plastic deformation; polymers; small-angle X-ray scattering; textile fibers
Abstract:
... The morphological properties as derived from wide- and small-angle x-ray scattering, IR dichroism, electron spin resonance, and electron microscopy, and the anisotropy of mechanical properties of the fiber structure can be well explained by the microfibrillar concept developed on the basis of a detailed study of plastic deformation and fracture of polymer single crystals. The microfibrils bridging ...
DOI:
10.1177/004051757204200105

9. An Electron Spin Resonance Study of the Copper (II) Interaction with Wool-Keratin : Part II: The Nature of the Copper (II) Interaction with Wool-Keratin

Author:
S. Kokot; M. Feughelman; R.M. Golding
Source:
Textile research journal 1973 v.43 no.3 pp. 146-153
ISSN:
0040-5175
Subject:
copper; electron paramagnetic resonance spectroscopy; fabrics; textile fibers; wool
Abstract:
... An examination of the Cu (II)/wool esr signal intensity variations, together with other relevant copper (II) uptake data, have shown that two types of products are formed during the Cu (II)/wool interaction. One of these gives rise to the observed esr signal, while the other is a diamagnetic sulfide of copper. The latter product arises as a result of a reaction of the metal ion and the products of ...
DOI:
10.1177/004051757304300305

10. An Electron Spin Resonance Study of the Copper (II) Interaction with Wool-Keratin : Part III: A Kinetic Model for the Cu(II)/Wool Interaction

Author:
S. Kokot; M. Feughelman; R.M. Golding
Source:
Textile research journal 1974 v.44 no.7 pp. 523-527
ISSN:
0040-5175
Subject:
copper; electron paramagnetic resonance spectroscopy; fabrics; kinetics; textile fibers; wool
Abstract:
... The uptakes of Cu(II) by wool are interpreted with the help of a kinetic model developed on the basis of a previously suggested reaction scheme. The kinetic model may be used to obtain information about the Cu(II)/wool interaction. ...
DOI:
10.1177/004051757404400710

11. Copper (II) Interactions with Montmorillonite: Evidence from Physical Methods

Author:
M. B. McBride; M. M. Mortland
Source:
Soil Science Society of America journal 1974 v.38 no.3 pp. 408-415
ISSN:
0361-5995
Subject:
X-ray diffraction; adsorption; clay; copper; electron paramagnetic resonance spectroscopy; ethanol; heat treatment; ions; ligands; magnetism; montmorillonite; silicates; solvation
Abstract:
... Interaction of exchangeable copper(II) with montmorillonite was studied by means of infrared and electron spin resonance spectroscopy supported by X-ray diffraction, magnetic susceptibility measurements, and determination of CEC values. The solvation properties of the clays after heat treatment are found to be much different with ethanol than with water. Dehydration of exchangeable Cu(II) allows t ...
DOI:
10.2136/sssaj1974.03615995003800030014x

12. Electron spin resonance studies of oxidation, photosensitized by ferric chloride of some alcohols in rigid glasses

Author:
Hinojosa, O.; Harris, J.A.; Arthur, J.C.
Source:
Carbohydrate research 1975 v.41 pp. 31-39
ISSN:
0008-6215
Subject:
1-propanol; methanol; free radicals; photolysis; electron paramagnetic resonance spectroscopy; oxidation; butanol; temperature; ethanol
Abstract:
... Ferric chloride-photosensitized oxidations of methanol, ethanol, 1-propanol (3), 2-propanol, 1-butanol (5), 2-methyl-1-propanol, 2-methyl-2-propanol (7), 1-pentanol, cyclopentanol, and cyclohexanol were conducted in the cavity of an e sr spectrometer at temperature between -150 and -196°, with high-pressure, mercury lamp as the light source except for rigid glasses of 7 plus ferric chloride, all o ...
Handle:
10113/36162

13. Exchange and Hydration Properties of Cu2+ on Mixed-ion Na+-Cu2+ Smectites

Author:
Murray B. McBride
Source:
Soil Science Society of America journal 1976 v.40 no.3 pp. 452-456
ISSN:
0361-5995
Subject:
X-ray diffraction; aluminum silicates; cations; clay; copper; electrodes; electron paramagnetic resonance spectroscopy; relative humidity; sodium
Abstract:
... The exchange of Na⁺-montmorillonite with Cu²⁺ was studied using X-ray diffraction, electron spin resonance (esr) and a specific Cu²⁺ electrode in order to investigate the hydration and exchange properties of mixed Cu²⁺-Na⁺ clay systems. With < 30% of the exchange sites occupied by Cu²⁺, the clays behave much as pure Na⁺-montmorillonite and swell freely in water. Larger exchange levels of Cu²⁺ prod ...
DOI:
10.2136/sssaj1976.03615995004000030038x

14. Polymerization of Aromatic Molecules on Smectite

Author:
M. M. Mortland; L. J. Halloran
Source:
Soil Science Society of America journal 1976 v.40 no.3 pp. 367-370
ISSN:
0361-5995
Subject:
benzene; cations; chemical structure; copper; electron paramagnetic resonance spectroscopy; iron; mass spectrometry; molecular weight; phenol; polymerization; sediments; smectite; soil
Abstract:
... When benzene or phenol are adsorbed on smectite containing Fe(III) or Cu(II) on the exchange complex, higher molecular weight products are formed. Evidence for these products is provided by mass spectroscopy. In the case of benzene most of the reaction products cannot be attributed to coupled benzene rings, while extensive coupling occurs for phenol. Electron spin resonance spectroscopy provides e ...
DOI:
10.2136/sssaj1976.03615995004000030019x

15. Synthesis of some furoic and thenoic esters of the methyl D-glucopyranosides, and their stability to high-energy radiation

Author:
Harris, J.A.; Arthur, J.C. Jr.; Hinojosa, O.; Boudreaux, G.J.; McCall, E.R.
Source:
Carbohydrate research 1977 v.53 no.1 pp. 57-66
ISSN:
0008-6215
Subject:
glucosides; esters; radiation physics; esterification; electron paramagnetic resonance spectroscopy; structure-activity relationships
Abstract:
... The esters obtained by complete esterificatlon of methyl D-glucopyranosides with, respectively, 2-furoyl chloride (β-, 1: α-, 2), 2-furanacryloyl chloride (β-, 3: α-, 4) 5-bromo-2-furoyl chloride (β-, 5: α-, 6) 2-thenoyl chloride (β-, 7: α-, 8) 5-methyl-2-thenoyl chloride (β-, 9: α-, 10) 5-bromothiopheneacryloyl chloride (β-, 11: α-, 12) and 2-thiopheneacryloyl chloride (β-, 13: α-, 14) were subje ...
Handle:
10113/36164

16. A Chemical and Spectroscopic Characterization of some Synthetic Analogues of Humic Acids

Author:
S. P. Mathur; M. Schnitzer
Source:
Soil Science Society of America journal 1978 v.42 no.4 pp. 591-596
ISSN:
0361-5995
Subject:
catechol; chemical degradation; electron paramagnetic resonance spectroscopy; enzymes; humic acids; hydroquinone; methylation; moieties; pesticides; polymerization; pyrogallol; quinones; salicylic acid; spectral analysis
Abstract:
... Fourteen analogues of humic acids (“HA's”) were synthesized from phenols, quinones, and salicylic acid by methods described in the literature. Elemental and functional group measurements, and infrared and electron spin resonance spectroscopy, indicated that seven of these “HA's” were in general similar to natural HA's. These “HA's” were methylated and further investigated by chemical degradation. ...
DOI:
10.2136/sssaj1978.03615995004200040011x

17. ESR and Optical Studies on the Interaction between Cu(II) and Pepsin

Author:
L. Sportelli; H. Neubacher; W. Lohmann
Source:
Zeitschrift für Naturforschung 1978 v.33 no.5-6 pp. 321-325
ISSN:
1865-7125
Subject:
aqueous solutions; copper; electron paramagnetic resonance spectroscopy; pepsin
Abstract:
... The interaction of Cu (II) with the protein pepsin has been investigated by means of electron spin resonance (ESR) and optical spectroscopy. Depending on the molar ratio of Cu(II) and pepsin in aqueous solution two different complexes are formed. A third complex can be detected after a reaction time of several days, attributed to a complex with a conformationally changed pepsin. The presence of in ...
DOI:
10.1515/znc-1978-5-603

18. Retention of Cu2+, Ca2+, Mg2+, and Mn2+ by Amorphous Alumina

Author:
Murray B. McBride
Source:
Soil Science Society of America journal 1978 v.42 no.1 pp. 27-31
ISSN:
0361-5995
Subject:
adsorption; aluminum oxide; calcium; copper; coprecipitation; electrodes; electron paramagnetic resonance spectroscopy; gels; ions; magnesium; manganese; pH
Abstract:
... The adsorption of Cu²⁺ at low pH on amorphous alumina gels was studied using electron spin resonance and specific ion electrode techniques. The results, when compared with the inability of alumina to retain Mn²⁺, Ca²⁺, and Mg²⁺, indicated that Cu²⁺ demonstrated a specific preference for alumina. Both Cu²⁺ and Mg²⁺ were found to coprecipitate readily with alumina; however, these ions opened the str ...
DOI:
10.2136/sssaj1978.03615995004200010007x

19. Structural Study of Humic Acids by X-ray, Electron Spin Resonance, and Infrared Spectroscopy

Author:
I. M. Eltantawy; M. Baverez
Source:
Soil Science Society of America journal 1978 v.42 no.6 pp. 903-905
ISSN:
0361-5995
Subject:
X-radiation; X-ray diffraction; composts; electron paramagnetic resonance spectroscopy; free radicals; humic acids; infrared spectroscopy; iron; moieties; quinones; soot
Abstract:
... Composts and soil humic acid structures were examined by X-ray, ESR, and IR methods. X-ray diffraction showed three bands at 3.6, 2.1, and 1.2Å for the studied humic acids. These bands occured on the same position as the (002), (10), and (11) of carbon black and were ascribed to aromatic structure or graphite-like layers. The presence of a 7.5Å band in the X-ray diffraction of the examined humic a ...
DOI:
10.2136/sssaj1978.03615995004200060014x

20. Chemisorption and Precipitation of Mn2+ at CaCO3 Surfaces

Author:
M. B. McBride
Source:
Soil Science Society of America journal 1979 v.43 no.4 pp. 693-698
ISSN:
0361-5995
Subject:
absorption; adsorption; calcite; calcium; calcium carbonate; electron paramagnetic resonance spectroscopy; manganese; manganese carbonate; solubility; surface area
Abstract:
... The adsorption of Mn²⁺ on two samples of powdered calcite with different surface areas has been studied using atomic absorption and electron spin resonance spectroscopy to investigate the solution and mineral phases. Chemisorption of Mn²⁺ on CaCO₃ surfaces lowered the solubility of Mn²⁺ below the level expected for MnCO₃ precipitation. At high levels of Mn²⁺ in solution, after saturation of surfac ...
DOI:
10.2136/sssaj1979.03615995004300040013x