The partial 1H NMR spectra of Al-OH and H2Omol in hydrous aluminosilicate glasses: Component-Resolved analysis of 27Al-1H cross polarization and 1H spin-echo spectraPublication year: 2010
Source: Solid State Nuclear Magnetic Resonance, In Press, Accepted Manuscript, Available online 9 April 2010
Wim J., Malfait , Xianyu, Xue
The Component-Resolved methodology was applied to 1H spin-echo and 27Al-1H cross polarization data of aluminosilicate glasses. The method was able to resolve two components with different T2 relaxation rates, hydroxyl groups (OH) and molecular water (H2Omol), from the spin-echo data and to determine partial spectra and the relative abundances of OH and H2Omol. The algorithm resolved two to three components with different 27Al-1H CP dynamics from the 27Al-1H cross polarization data; the obtained partial NMR spectra for Al-OH are in excellent agreement with those obtained previously from the difference spectra and confirm previous quantitative results and models for the Al-OH, Si-OH and H2Omol speciation (Malfait and Xue, 2010).
Source: Solid State Nuclear Magnetic Resonance, In Press, Accepted Manuscript, Available online 7 April 2010
Jeffrey A., Reimer
Nuclear hyperpolarization can be achieved in a number of ways. This article focuses on the use of coupling of nuclei to (nearly) pure quantum states, with particular emphasis on those states obtained by optical excitation in bulk semiconductors. I seek an answer to this question: ”What is to prevent the design and analysis of nuclear spintronics devices that use the extremely long-lived hyperpolarized nuclear spin states, and their weak couplings to each other, to affect computation, memory, or informational technology schemes?” The answer, I argue, is in part because there remains a lack of fundamental understanding of how to generate and control nuclear polarization with schemes other than with rf coils.