Matches in SemOpenAlex for { <https://semopenalex.org/work/W2281736725> ?p ?o ?g. }
- W2281736725 endingPage "6329" @default.
- W2281736725 startingPage "6317" @default.
- W2281736725 abstract "Solid- and solution-state nuclear magnetic resonance (NMR) studies of six Ecuadorian asphaltenes have provided insight into using NMR to characterize asphaltenes. For these asphaltenes, free radicals prevent obtaining quantitatively meaningful 1H–13C cross-polarization magic angle spinning (CPMAS) spectra but facilitate obtaining meaningful carbon aromaticity values in direct polarization with 13C pulse excitation. The benefit of studying any asphaltene by obtaining a series of CPMAS spectra with multiple contact times, rather than just a single contact time, is demonstrated. Analyzing the CPMAS and direct 13C pulse spectra indicates that, on average, condensed aromatic ring systems become larger as the aromaticity increases, which seems more consistent with “island” than “archipelago” aromatic structures, just as recently proposed for asphaltenes. Solution-state two-dimensional (2D) 1H–13C heteronuclear single-quantum coherence (HSQC) spectra of the asphaltenes provide a wealth of structural information and are particularly useful for demonstrating that isolated methyl branches on alkyl chains are much more abundant than aromatic methyl groups. The prospect of using cryoprobes to obtain one-dimensional (1D) and 2D spectra with a much higher signal-to-noise ratio (S/N) allowing for a more detailed analysis of the less abundant structural environments is clearly attractive." @default.
- W2281736725 created "2016-06-24" @default.
- W2281736725 creator A5021905279 @default.
- W2281736725 creator A5036688094 @default.
- W2281736725 creator A5044784102 @default.
- W2281736725 creator A5080737095 @default.
- W2281736725 creator A5084292958 @default.
- W2281736725 date "2015-09-18" @default.
- W2281736725 modified "2023-09-27" @default.
- W2281736725 title "Solid- and Solution-State Nuclear Magnetic Resonance Analyses of Ecuadorian Asphaltenes: Quantitative Solid-State Aromaticity Determination Supporting the “Island” Structural Model. Aliphatic Structural Information from Solution-State <sup>1</sup>H–<sup>13</sup>C Heteronuclear Single-Quantum Coherence Experiments" @default.
- W2281736725 cites W11016882 @default.
- W2281736725 cites W1584929418 @default.
- W2281736725 cites W1599030288 @default.
- W2281736725 cites W1966083866 @default.
- W2281736725 cites W1967931457 @default.
- W2281736725 cites W1969194890 @default.
- W2281736725 cites W1974993897 @default.
- W2281736725 cites W1979900033 @default.
- W2281736725 cites W1980637262 @default.
- W2281736725 cites W1982591113 @default.
- W2281736725 cites W1983208534 @default.
- W2281736725 cites W1988196132 @default.
- W2281736725 cites W1991845517 @default.
- W2281736725 cites W1992088945 @default.
- W2281736725 cites W1993135296 @default.
- W2281736725 cites W1995684634 @default.
- W2281736725 cites W1995816323 @default.
- W2281736725 cites W1996263403 @default.
- W2281736725 cites W1998042239 @default.
- W2281736725 cites W1998361673 @default.
- W2281736725 cites W1999662383 @default.
- W2281736725 cites W1999731770 @default.
- W2281736725 cites W2001297628 @default.
- W2281736725 cites W2006487061 @default.
- W2281736725 cites W2009212043 @default.
- W2281736725 cites W2010346434 @default.
- W2281736725 cites W2011929500 @default.
- W2281736725 cites W2012640017 @default.
- W2281736725 cites W2022220138 @default.
- W2281736725 cites W2022789855 @default.
- W2281736725 cites W2024581814 @default.
- W2281736725 cites W2025349175 @default.
- W2281736725 cites W2031281508 @default.
- W2281736725 cites W2031611805 @default.
- W2281736725 cites W2045129514 @default.
- W2281736725 cites W2055516309 @default.
- W2281736725 cites W2055766501 @default.
- W2281736725 cites W2058797209 @default.
- W2281736725 cites W2059845027 @default.
- W2281736725 cites W2061028685 @default.
- W2281736725 cites W2065106327 @default.
- W2281736725 cites W2066743785 @default.
- W2281736725 cites W2066909672 @default.
- W2281736725 cites W2068279304 @default.
- W2281736725 cites W2076655673 @default.
- W2281736725 cites W2080495904 @default.
- W2281736725 cites W2082984023 @default.
- W2281736725 cites W2085001780 @default.
- W2281736725 cites W2085287899 @default.
- W2281736725 cites W2086267706 @default.
- W2281736725 cites W2086618929 @default.
- W2281736725 cites W2086965084 @default.
- W2281736725 cites W2089040617 @default.
- W2281736725 cites W2107746113 @default.
- W2281736725 cites W2121285240 @default.
- W2281736725 cites W2134860803 @default.
- W2281736725 cites W2135446807 @default.
- W2281736725 cites W2146343250 @default.
- W2281736725 cites W2199686530 @default.
- W2281736725 cites W2316964273 @default.
- W2281736725 cites W2325410418 @default.
- W2281736725 cites W2327581505 @default.
- W2281736725 cites W2327668435 @default.
- W2281736725 cites W2328106394 @default.
- W2281736725 cites W2328611203 @default.
- W2281736725 cites W2331681850 @default.
- W2281736725 cites W2334386657 @default.
- W2281736725 cites W2335054222 @default.
- W2281736725 cites W2335501731 @default.
- W2281736725 cites W2335875530 @default.
- W2281736725 cites W246782882 @default.
- W2281736725 cites W247904156 @default.
- W2281736725 cites W2508882177 @default.
- W2281736725 cites W2952178250 @default.
- W2281736725 cites W4239713585 @default.
- W2281736725 cites W51878273 @default.
- W2281736725 cites W810710202 @default.
- W2281736725 doi "https://doi.org/10.1021/acs.energyfuels.5b01455" @default.
- W2281736725 hasPublicationYear "2015" @default.
- W2281736725 type Work @default.
- W2281736725 sameAs 2281736725 @default.
- W2281736725 citedByCount "19" @default.
- W2281736725 countsByYear W22817367252016 @default.
- W2281736725 countsByYear W22817367252017 @default.
- W2281736725 countsByYear W22817367252019 @default.
- W2281736725 countsByYear W22817367252020 @default.
- W2281736725 countsByYear W22817367252021 @default.
- W2281736725 countsByYear W22817367252022 @default.