Search Results - "Kenttaemaa, Hilkka I"

Characterization of Asphaltene Deposits by Using Mass Spectrometry and Raman Spectroscopy by Riedeman, James S, Kadasala, Naveen Reddy, Wei, Alexander, Kenttämaa, Hilkka I

“…Crude oil deposition in oil transfer pipelines and bore wells afflicts many oil reservoirs. Asphaltenes play a major role in this process because of their…”
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Structural Comparison of Asphaltenes of Different Origins Using Multi-stage Tandem Mass Spectrometry by Tang, Weijuan, Hurt, Matthew R, Sheng, Huaming, Riedeman, James S, Borton, David J, Slater, Peter, Kenttämaa, Hilkka I

“…In this work, six petroleum asphaltene samples of different geographical origins were studied using atmospheric pressure chemical ionization (APCI) in…”
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Comparison of the Structures of Molecules in Coal and Petroleum Asphaltenes by Using Mass Spectrometry by Hurt, Matthew R, Borton, David J, Choi, Heewon J, Kenttämaa, Hilkka I

“…Asphaltenes are a complex mixture of aromatic compounds that are present in petroleum and liquefied coal and have unknown molecular structures. Determination…”
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On-Line Mass Spectrometric Methods for the Determination of the Primary Products of Fast Pyrolysis of Carbohydrates and for Their Gas-Phase Manipulation by Hurt, Matthew R, Degenstein, John C, Gawecki, Piotr, Borton II, David J, Vinueza, Nelson R, Yang, Linan, Agrawal, Rakesh, Delgass, W. Nicholas, Ribeiro, Fabio H, Kenttämaa, Hilkka I

“…Mass spectrometric methodology was developed for the determination and manipulation of the primary products of fast pyrolysis of carbohydrates. To determine…”
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UV-induced effects on chlorination of creatinine by Weng, Shih Chi, Li, Jing, Wood, Karl V., Kenttämaa, Hilkka I., Williams, Peggy E., Amundson, Lucas M., Blatchley, Ernest R.

“…Ultraviolet (UV) irradiation is commonly employed for water treatment in swimming pools to complement conventional chlorination, and to reduce the…”
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On the factors that control the reactivity of meta-benzynes by Gao, Jinshan, Jankiewicz, Bartłomiej J., Reece, Jennifer, Sheng, Huaming, Cramer, Christopher J., Nash, John J., Kenttämaa, Hilkka I.

“…The reactivities of eleven 3,5-didehydropyridinium and six 2,4-didehydropyridinium cations toward cyclohexane were examined in the gas phase by using…”
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Mass spectrometric identification of the N-monosubstituted N-hydroxylamino functionality in protonated analytes via ion/molecule reactions in tandem mass spectrometry by Sheng, Huaming, Tang, Weijuan, Yerabolu, Ravikiran, Kong, John Y., Williams, Peggy E., Zhang, Minli, Kenttämaa, Hilkka I.

“…Rationale N‐Monosubstituted hydroxylamines correspond to an important class of metabolites for many bioactive molecules. In this study, a tandem mass…”
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A Differentially Pumped Dual Linear Quadrupole Ion Trap (DLQIT) Mass Spectrometer: A Mass Spectrometer Capable of MSn Experiments Free From Interfering Reactions by Owen, Benjamin C, Jarrell, Tiffany M, Schwartz, Jae C, Oglesbee, Rob, Carlsen, Mark, Archibold, Enada F, Kenttämaa, Hilkka I

“…A novel differentially pumped dual linear quadrupole ion trap (DLQIT) mass spectrometer was designed and built to facilitate tandem MS experiments free from…”
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Reactivity Controlling Factors for an Aromatic Carbon-Centered σ,σ,σ-Triradical: The 4,5,8-Tridehydroisoquinolinium Ion by Vinueza, Nelson R., Jankiewicz, Bartłomiej J., Gallardo, Vanessa A., LaFavers, Gregory Z., DeSutter, Dane, Nash, John J., Kenttämaa, Hilkka I.

“…The chemical properties of the 4,5,8‐tridehydroisoquinolinium ion (doublet ground state) and related mono‐ and biradicals were examined in the gas phase in a…”
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Ion-molecule reactions for the differentiation of primary, secondary and tertiary hydroxyl functionalities in protonated analytes in a tandem mass spectrometer by Fu, Mingkun, Duan, Penggao, Gao, Jinshan, Kenttämaa, Hilkka I

“…A mass spectrometric method utilizing gas-phase ion-molecule reactions of 1-butanethiol and di-tert-butyl peroxide has been developed for the differentiation…”
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Separation of Asphaltenes by Reversed-Phase Liquid Chromatography with Fraction Characterization by Loegel, Thomas N, Danielson, Neil D, Borton, David J, Hurt, Matthew R, Kenttämaa, Hilkka I

“…The use of a 4.6 × 250 mm, 5 μm cyanopropyl column is effective for the liquid chromatography (LC) separation of asphaltenes with sequential ultraviolet (UV)…”
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Analysis of carbohydrates by atmospheric pressure chloride anion attachment tandem mass spectrometry by Vinueza, Nelson R., Gallardo, Vanessa A., Klimek, John F., Carpita, Nicholas C., Kenttämaa, Hilkka I.

“…► We have developed a method for the analysis of cellulose degradation products. ► Chloride attachment in atmospheric pressure gently ionizes oligosaccharides…”
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Development of a High-Throughput Laser-Induced Acoustic Desorption Probe and Raster Sampling For Laser-Induced Acoustic Desorption/Atmospheric Pressure Chemical Ionization by Borton, David J, Amundson, Lucas M, Hurt, Matthew R, Dow, Alex, Madden, Jeremy T, Simpson, Garth J, Kenttämaa, Hilkka I

“…Laser-induced acoustic desorption (LIAD) was recently coupled to atmospheric pressure chemical ionization (APCI) and shown to be of great utility for the…”
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Experimental and Computational Studies on the Formation of Three para-Benzyne Analogues in the Gas Phase by Kirkpatrick, Lindsey M., Vinueza, Nelson R., Jankiewicz, Bartłomiej J., Gallardo, Vanessa A., Archibold, Enada F., Nash, John J., Kenttämaa, Hilkka I.

“…Experimental and computational studies on the formation of three gaseous, positively‐charged para‐benzyne analogues in a Fourier transform ion cyclotron…”
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Reactivity of the 4,5-Didehydroisoquinolinium Cation by Vinueza, Nelson R., Archibold, Enada F., Jankiewicz, Bartłomiej J., Gallardo, Vanessa A., Habicht, Steven C., Aqueel, Mohammad Sabir, Nash, John J., Kenttämaa, Hilkka I.

“…The chemical properties of a 1,8‐didehydronaphthalene derivative, the 4,5‐didehydroisoquinolinium cation, were examined in the gas phase in a dual‐cell…”
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Substituent Effects on the Nonradical Reactivity of 4-Dehydropyridinium Cation by Jankiewicz, Bartłomiej J, Gao, Jinshan, Reece, Jennifer N, Vinueza, Nelson R, Narra, Padmaja, Nash, John J, Kenttämaa, Hilkka I

“…Recent studies have shown that the reactivity of the 4-dehydropyridinium cation significantly differs from the reactivities of its isomers toward…”
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A novel chemical ionization reagent ion for organic analytes: the aquachloromanganese(II) cation [ClMn(H2O)+] by Gqamana, Putuma P., Duan, Penggao, Fu, Mingkun, Gallardo, Vanessa, Kenttämaa, Hilkka I.

“…The reactivity of ClMn(H2O)+ towards small organic compounds (L) was examined in a Fourier transform ion cyclotron resonance (FT‐ICR) mass spectrometer. The…”
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Identification and Counting of Oxygen Functionalities and Alkyl Groups of Aromatic Analytes in Mixtures by Positive-Mode Atmospheric Pressure Chemical Ionization Tandem Mass Spectrometry Coupled with High-Performance Liquid Chromatography by Amundson, Lucas M, Gallardo, Vanessa A, Vinueza, Nelson R, Owen, Benjamin C, Reece, Jennifer N, Habicht, Steven C, Fu, Mingkun, Shea, Ryan C, Mossman, Allen B, Kenttämaa, Hilkka I

“…A tandem mass spectrometric method using a commercial linear quadrupole ion trap (LQIT) mass spectrometer and another LQIT coupled with a Fourier transform ion…”
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Chemical Characterization and Quantitation of Phenols in Fuel Extracts by Using Gas Chromatography/Methane Chemical Ionization Triple Quadrupole Mass Spectrometry by Guthrie, Jacob D., Romanczyk, Mark, Kilaz, Gozdem, Peretich, Michael E., Kenttämaa, Hilkka I.

“…The ability to detect, characterize, and quantify phenols in aviation fuels is critical as these compounds can negatively affect the storage stability of the…”
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Total Utilization of Miscanthus Biomass, Lignin and Carbohydrates, Using Earth Abundant Nickel Catalyst by Luo, Hao, Klein, Ian M, Jiang, Yuan, Zhu, Hanyu, Liu, Baoyuan, Kenttämaa, Hilkka I, Abu-Omar, Mahdi M

“…Lignin as a polymer of monomeric aromatic compounds retains great potential to be a source for liquid fuels and valuable chemicals. However, lignin from…”
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