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857 results on '"Brennecke, Joan F."'

53. Solubility of C[O.sub.2], C[H.sub.4], [C.sub.2][H.sub.6], [C.sub.2][H.sub.6], [O.sub.2], and [N.sub.2] in 1-hexyl-3-methylpyridinium Bis(trifluoromethylsulfonyl)imide: comparison to other ionic liquids

Author

Anderson, Jessica L., Dixon, Janielle K., and Brennecke, Joan F.

Subjects
Ionic solutions -- Research, Ionic solutions -- Chemical properties, Coordination compounds -- Research, Coordination compounds -- Chemical properties, Chemistry, Science and technology
Abstract

A study to examine the solubility of gases in ionic liquids (ILs) is conducted. Findings reveal a several fold increase in carbon dioxide solubility due to the use of fluoro-alkyl chains.

Published
2007

54. Characterization of the ability of C[O.sub.2] to act as an antisolvent for ionic liquid/organic mixtures

Author

Mellein, Beryln R. and Brennecke, Joan F.

Subjects
Ionic solutions -- Chemical properties, Hydrogen bonding -- Analysis, Carbon compounds -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The ability of C[O.sub.2] to induce liquid/liquid-phase separation in mixtures of ionic liquids and organics is examined. The ability of C[O.sub.2] to act as an antisolvent has depended on the solubility of the C[O.sub.2] in the ionic liquid/organic mixture and strong hydrogen bonding between the ionic liquid and the organic has made it difficult for C[O.sub.2] to induce a liquid/liquid-phase secarbon compoundsparation.

Published
2007

55. Solvatochromic studies of ionic liquid/organic mixtures

Author

Mellein, Berlyn R., Aki, Sudhir N.V.K., Ladewski, Rebecca L., and Brennecke, Joan F.

Subjects
Ionic solutions -- Chemical properties, Organic dyes -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The solvent strength of IL/organic mixtures is reported using Reichardt's dyes 30 and 33, Kamlet-Taft parameters and phenol blue. The results shows that the polarity of ILs is largely unaffected by the organic consolvent that is the probes are preferentially solvated by the ILs.

Published
2007

60. Confronting Racism in Chemistry Journals

Author

Burrows, Cynthia J., primary, Huang, Jiaxing, additional, Wang, Shu, additional, Kim, Hyun Jae, additional, Meyer, Gerald J., additional, Schanze, Kirk, additional, Lee, T. Randall, additional, Lutkenhaus, Jodie L., additional, Kaplan, David, additional, Jones, Christopher, additional, Bertozzi, Carolyn, additional, Kiessling, Laura, additional, Mulcahy, Mary Beth, additional, Lindsley, Craig W., additional, Finn, M. G., additional, Blum, Joel D., additional, Kamat, Prashant, additional, Choi, Wonyong, additional, Snyder, Shane, additional, Aldrich, Courtney C., additional, Rowan, Stuart, additional, Liu, Bin, additional, Liotta, Dennis, additional, Weiss, Paul S., additional, Zhang, Deqing, additional, Ganesh, Krishna N., additional, Atwater, Harry A., additional, Gooding, J. Justin, additional, Allen, David T., additional, Voigt, Christopher A., additional, Sweedler, Jonathan, additional, Schepartz, Alanna, additional, Rotello, Vincent, additional, Lecommandoux, Sébastien, additional, Sturla, Shana J., additional, Hammes-Schiffer, Sharon, additional, Buriak, Jillian, additional, Steed, Jonathan W., additional, Wu, Hongwei, additional, Zimmerman, Julie, additional, Brooks, Bryan, additional, Savage, Phillip, additional, Tolman, William, additional, Hofmann, Thomas F., additional, Brennecke, Joan F., additional, Holme, Thomas A., additional, Merz, Kenneth M., additional, Scuseria, Gustavo, additional, Jorgensen, William, additional, Georg, Gunda I., additional, Wang, Shaomeng, additional, Proteau, Philip, additional, Yates, John R., additional, Stang, Peter, additional, Walker, Gilbert C., additional, Hillmyer, Marc, additional, Taylor, Lynne S., additional, Odom, Teri W., additional, Carreira, Erick, additional, Rossen, Kai, additional, Chirik, Paul, additional, Miller, Scott J., additional, Shea, Joan-Emma, additional, McCoy, Anne, additional, Zanni, Martin, additional, Hartland, Gregory, additional, Scholes, Gregory, additional, Loo, Joseph A., additional, Milne, James, additional, Tegen, Sarah B., additional, Kulp, Daniel T., additional, and Laskin, Julia, additional

Published
2020
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61. Anion effects on gas solubility in ionic liquids

Author

Anthony, Jennifer L., Anderson, Jessica L., Maginn, Edward J., and Brennecke, Joan F.

Subjects
Ionic solutions -- Research, Imidazole -- Electric properties, Anions -- Research, Chemicals, plastics and rubber industries
Abstract

A report on the solubilities of a variety of gases in several different ionic liquids is presented. It is concluded that the nature of the anion has the most significant influence on the gas solubilities.

Published
2005

62. High-pressure phase behavior of carbon dioxide with imidazolium-based ionic liquids

Author

Aki, Sudhir N.V.K., Mellein, Berlyn R., Saurer, Eric M., and Brennecke, Joan F.

Subjects
Ionic solutions -- Chemical properties, Carbon dioxide -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The influence of anion, cation alkyl chain length, and additional alkyl substituents on the cation ring and on the solubility of CO2 in ILs at pressures to 150 bar is investigated. The results suggest that the solubility of carbon dioxide is strongly dependent on the choice of anion.

Published
2004

63. Hydroxyl radical reactivity with nitrobenzene in subcritical and supercritical water

Author

Feng, Junbo, Aki, Sudhir N.V.K., Chateauneuf, John E., and Brennecke, Joan F.

Subjects
Chemical reactions -- Analysis, Oxidation-reduction reaction -- Methods, Nitrobenzenes -- Chemical properties, Chemistry
Abstract

The bimolecular rate constants of the addition reaction between hydroxyl radical and nitrobenzene are determined in subcritical and supercritical water (SCW) at temperatures between ambient and 390 degree celsius. The measured bimolecular rate constants reported distinctly non-Arrhenius behavior from ambient to 350 degree celsius but increased in the slightly subcritical and supercritical region between 350 and 390 degree celsius.

Published
2002

64. Solution thermodynamics of imidazolium-based ionic liquids and water

Author

Anthony, Jennifer L., Maginn, Edward J., and Brennecke, Joan F.

Subjects
Chemistry, Physical and theoretical -- Research, Solution (Chemistry) -- Physiological aspects, Thermodynamics -- Analysis, Imidazole -- Physiological aspects, Ionic solutions -- Physiological aspects, Chemicals, plastics and rubber industries
Published
2001

65. Generation of Xanthenium and 9-phenylxanthenium carbocations in subcritical water and reactivity with amylamine

Author

Aki, Sudhir N. V. K., Feng, Junbo, Chateauneuf, John E., and Brennecke, Joan F.

Subjects
Amines -- Chemical properties, Ionization -- Research, Xanthine -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

A study of the ability of subcritical water to support ionic chemistry from the successful generation of (-R-xanthenium (R = H and C6H5) carbocations at temperatures up to 330 degrees Celsius from their respective alcohol precursors. The results show that for ion/neutral isoCoulombic reactions, require low-temperature Arrhenius parameters to predict the rate constants in water at higher temperatures and that the effect of pressure on the bimolecular rate constants in the temperature range of 22-330 degrees Celsius was negligible.

Published
2001

73. Editorial Confronting Racism in Chemistry Journals

Author

Burrows, Cynthia J., primary, Huang, Jiaxing, additional, Wang, Shu, additional, Kim, Hyun Jae, additional, Meyer, Gerald J., additional, Schanze, Kirk, additional, Lee, T. Randall, additional, Lutkenhaus, Jodie L., additional, Kaplan, David, additional, Jones, Christopher, additional, Bertozzi, Carolyn, additional, Kiessling, Laura, additional, Mulcahy, Mary Beth, additional, Lindsley, Craig W., additional, Finn, M. G., additional, Blum, Joel D., additional, Kamat, Prashant, additional, Choi, Wonyong, additional, Snyder, Shane, additional, Aldrich, Courtney C., additional, Rowan, Stuart, additional, Liu, Bin, additional, Liotta, Dennis, additional, Weiss, Paul S., additional, Zhang, Deqing, additional, Ganesh, Krishna N., additional, Atwater, Harry A., additional, Gooding, J. Justin, additional, Allen, David T., additional, Voigt, Christopher A., additional, Sweedler, Jonathan, additional, Schepartz, Alanna, additional, Rotello, Vincent, additional, Lecommandoux, Sébastien, additional, Sturla, Shana J., additional, Hammes-Schiffer, Sharon, additional, Buriak, Jillian, additional, Steed, Jonathan W., additional, Wu, Hongwei, additional, Zimmerman, Julie, additional, Brooks, Bryan, additional, Savage, Phillip, additional, Tolman, William, additional, Hofmann, Thomas F., additional, Brennecke, Joan F., additional, Holme, Thomas A., additional, Merz, Kenneth M., additional, Scuseria, Gustavo, additional, Jorgensen, William, additional, Georg, Gunda I., additional, Wang, Shaomeng, additional, Proteau, Philip, additional, Yates, John R., additional, Stang, Peter, additional, Walker, Gilbert C., additional, Hillmyer, Marc, additional, Taylor, Lynne S., additional, Odom, Teri W., additional, Carreira, Erick, additional, Rossen, Kai, additional, Chirik, Paul, additional, Miller, Scott J., additional, Shea, Joan-Emma, additional, McCoy, Anne, additional, Zanni, Martin, additional, Hartland, Gregory, additional, Scholes, Gregory, additional, Loo, Joseph A., additional, Milne, James, additional, Tegen, Sarah B., additional, Kulp, Daniel T., additional, and Laskin, Julia, additional

Published
2020
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85. Recent Progress in the Development of Supercritical Carbon Dioxide-Soluble Metal Ion Extractants: Solubility Enhancement through Silicon Functionalization

Author

Dietz, Mark L., primary, McAlister, Daniel R., additional, Stepinski, Dominique, additional, Zalupski, Peter R., additional, Dzielawa, Julie A., additional, Barrans, Richard E., additional, Hess, J. N., additional, Rubas, Audris V., additional, Chiarizia, Renato, additional, Lubbers, Christopher, additional, Scurto, Aaron M., additional, Brennecke, Joan F., additional, and Herlinger, Albert W., additional

Published
2006
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87. Laser flash photolysis investigation of the triplet-triplet annihilation of anthracene in supercritical water

Author

Kremer, Mary J., Connery, Karen A., DiPippo, Matthew M., Feng, Junbo, Chateauneuf, John E., and Brennecke, Joan F.

Subjects
Annihilation reactions -- Case studies, Anthracite coal -- Analysis, Chemical reactions -- Analysis, Hydrocarbons -- Analysis, Liquids -- Analysis, Chemicals, plastics and rubber industries
Abstract

A study investigated the triplet-triplet annihilation of anthracene in supercritical water at temperatures ranging from 375 degrees to 450 degrees C and pressures of 50-350 bar. The experiment aimed to determine whether the conclusions about diffusion-controlled reactions in lower temperature supercritical fluids also apply to reactions in supercritical water. Observed rate constant and anthracene triplet extinction coefficient data were taken to determine the bimolecular rate constants as a function of temperature and pressure.

Published
1999

96. A steady state and time-resolved fluorescence study of quenching reactions of anthracene and 1,2-benzanthracene by carbon tetrabromide and bromethane in supercritical carbon dioxide

Author

Zhang, Jianwei, Roek, Daniel P., Chateaneuf, John E., and Brennecke, Joan F.

Subjects
Energy transfer -- Analysis, Solvation -- Analysis, Supercritical fluid extraction -- Research, Chemistry
Abstract

Investigation of local solvation effects during fluorescence quenching of anthracene in supercritical CO2 as the reaction is varied from diffusion controlled to kinetically controlled found that reaction rates depend on donor energy levels and acceptor electron affinities. Results indicate that a large pressure effect is exerted on reaction rate by local composition enhancement of the quencher molecules in the anthracene solute. Fluorescence spectra and solvatochromic shift data indicate both local density augmentation and local composition increases around the anthracene.

Published
1997

98. Laser flash photolysis and integral equation theory to investigate reactions of dilute solutes with oxygen in supercritical fluids

Author

Roberts, Christopher B., Zhang, Jianwei, Chateauneuf, John E., and Brennecke, Joan F.

Subjects
Laser photochemistry -- Usage, Integral equations -- Usage, Dilution -- Analysis, Supercritical fluid extraction -- Research, Chemistry
Abstract

The absolute reactivity of triplet benzophenone and benzyl free radicals towards molecular oxygen in supercritical CO2 and CHF3 is measured using laser flash photolysis, absolute reaction kinetics and integral equation theory in order to investigate preferential consolvent solvation in ternary supercritical fluid mixtures. The bimolecular rate constants increase slightly with increase in pressure and are consistent with the preferential solvation of the solute.

Published
1995

99. Diffusion-controlled reactions in supercritical CHF3 and CO2/acetonitrile mixtures

Author

Roberts, Christopher B., Jianwei Zhang, Chateauneuf, John E., and Brennecke, Joan F.

Subjects
Diffusion -- Analysis, Chemical reactions -- Analysis, Organic compounds -- Analysis, Chemistry
Abstract

Investigations of the possibility of diffusion-controlled mechanisms being obstructed or enhanced in supercritical fluids or fluid mixtures, draw on the findings of the triplet-triplet annihilation process of benzophenone (Ph2C double bond O) and the self-termination reaction of benzyl radical, PhCh2. Both reactions occur basically at the diffusion-control limit in supercritical fluoroform and carbon dioxide doped with 1 mol % acetonitrile when spin statistical factors are considered.

Published
1993

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