Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Gary L. Turner"'
Publikováno v:
Journal of the American Ceramic Society. 80:1239-1244
The authors have used magic-angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy to examine the polyhedral arrangements in ternary lanthanum aluminoborate glasses. They have characterized two glass-forming series: xAl{sub 2}O{su
Publikováno v:
Macromolecular Symposia. 140:263-270
Vibrational spectroscopy has been used to correlate the features of silicate solution spectra with 29 Si NMR spectra, as a function of SiO 2 :Na 2 O ratio and SiO 2 concentration. Assignments of infrared and Raman component bands have been made for d
Autor:
Gary L. Turner, Jonathan L. Bass
Publikováno v:
The Journal of Physical Chemistry B. 101:10638-10644
Soluble silicates are complex mixtures of silicate anions. The larger anions are two- or three-dimensional condensation products of silicate monomer, SiO4-4. In more siliceous silicate solutions, i.e., SiO2:Na2O ratio >2.0, some of the silicate conde
Publikováno v:
Journal of the American Ceramic Society. 79:2410-2416
Glasses from the RO.La2O3.B2O3 (R = Mg, Ca, and Ba) systems have been examined. Glass formation is centered along the metaborate tie line, from La(BO2)3 to R(BO2)2. Glasses generally have transition temperatures >60°C and expansion coefficients betw
Autor:
Cynthia J. Jameson, Gary L. Turner, Eric Oldfield, Angel C. de Dios, Rex E. Gerald, A. Keith Jameson
Publikováno v:
Solid State Nuclear Magnetic Resonance. 4:1-12
We present the first demonstration that the individual {sup 129}Xe resonances corresponding to Xe{sub n} (n = 1-8) clusters inside the {alpha}-cages of zeolite NaA can be narrowed under magic-angle spinning (MAS). Under these high-resolution conditio
Publikováno v:
Journal of the American Ceramic Society. 76:919-928
We have used 27 Al and 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy and X-ray photoelectron spectroscopy (XPS) to describe quantitatively the relationships between the composition, structure, and properties of glasses i
Autor:
Jonathan L. Bass, Gary L. Turner
Publikováno v:
ChemInform. 29
Soluble silicates are complex mixtures of silicate anions. The larger anions are two- or three-dimensional condensation products of silicate monomer, SiO4-4. In more siliceous silicate solutions, i.e., SiO2:Na2O ratio >2.0, some of the silicate conde
Publikováno v:
Macromolecules. 25:3027-3030
Large differential line broadening (DLB) of the individual components of 13 -C 1 H coupled multiplets were observed in 13 C MAS NMR spectra of solid poly(cis-butadiene), poly(cis-isoprene), poly(cis,trans-butadiene), butadien-styrene and acrylonitril
Publikováno v:
Journal of the American Ceramic Society. 74:1287-1290
We have examined a series of metaphosphate glasses with 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential (Z/a) of the modifying cation from sodium to magnesium causes a systematic change to mo
Publikováno v:
Journal of the American Ceramic Society. 74:1430-1438
11B and 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectra of alkaline-earth boroaluminate glasses show that the structure of these glasses are far more complicated than previously thought. The relative concentrations of 3- and 4-