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243 results on '"Bonnesen, Peter V."'

53. Cover Picture: High‐Selectivity Electrochemical Conversion of CO 2 to Ethanol using a Copper Nanoparticle/N‐Doped Graphene Electrode (ChemistrySelect 19/2016)

Author

Song, Yang, primary, Peng, Rui, additional, Hensley, Dale K., additional, Bonnesen, Peter V., additional, Liang, Liangbo, additional, Wu, Zili, additional, Meyer, Harry M., additional, Chi, Miaofang, additional, Ma, Cheng, additional, Sumpter, Bobby G., additional, and Rondinone, Adam J., additional

Published
2016
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54. Method To Synthesize Micronized Spherical Carbon Particles from Lignin

Author

Ho, Hoi Chun, Bonnesen, Peter V., Nguyen, Ngoc A., Cullen, David A., Uhrig, David, Goswami, Monojoy, Keum, Jong K., and Naskar, Amit K.

Abstract

Spherical carbon particles are versatile products that are of interest in polymer modification and scaffolding, catalysis, and energy storage applications. Despite various complex synthesis methods available currently, there is a need for simplified synthesis techniques to develop spherical carbon particles from sustainable feedstock. Here, we report a simple method for manufacturing micronized carbon particles from lignin, a plant biomass derived phenolic oligomer. By careful selection of a good, high boiling solvent that can fully solvate and stabilize lignin, we were able to create spherical free-flowing carbon particles from lignin by a simple solvothermal process and subsequent carbonization. During solvothermal reaction, lignin degrades into fragments via its thermally sensitive bonds. Simultaneously, the residual lignin and its fragments repolymerize, condense into highly cross-linked structures, and eventually precipitate out of solution with a spherical shape. Infrared and NMR spectroscopy data in combination with the rheological properties of thermally condensed, solvated oligomer elucidate evolution in the chemical architecture of lignin. The coarse-grained molecular dynamics simulations revealed the growth of spherical char from lignin in a good solvent through intermolecular condensation. X-ray diffraction and electron microscopy data show the morphology of the carbonized product—an increase in the carbonization temperature enhances the structural order.

Published
2020
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55. Novel approach to sodium hydroxide separation: Synergistic pseudo-hydroxide extraction by a fluorinated alcohol and cage-functional crown ethers

Author

Levitskaia, Tatiana G., Marchand, Alan P., Moyer, Bruce A., Krishnudu, Kasireddy, Kruger, Hendrick G., Zhibing Chen, McKim, Artie S., Zilin Huang, and Bonnesen, Peter V.

Subjects
Hydrogen-ion concentration -- Research, Ethers -- Chemical properties, Sodium hydroxide -- Chemical properties, Sodium hydroxide -- Research, Chemistry
Abstract

Model distribution studies have demonstrated that the principle of synergistic pseudo-hydroxide extraction in which cation host molecules synergistically enhance liquid-liquid cation exchange of sodium ion by w weakly acidic hydrogen acid at high pH. This novel approach is based on the simultaneous utilizations of ion-exchange recovery and recycles in industrial applications.

Published
2001

56. Ultrasensitive Detection of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] Using a Microcantilever Sensor

Author

Ji, Hai-Feng, Thundat, Thomas, Dabestani, Reza, Brown, Gilbert M., Britt, Philip F., and Bonnesen, Peter V.

Subjects
Ions -- Research, Bromides -- Usage, Chemistry
Abstract

Microcantilevers modified with a self-assembled monolayer respond sensitively to specific ion concentrations. Here, we report the detection of trace amounts of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] using microcantilevers modified with a self-assembled monolayer of triethyl-12-mercaptododecylammonium bromide. The self-assembled monolayer was prepared on a silicon microcantilever coated with a thin layer of gold on one side. The microcantilever undergoes bending due to sorption of [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] ions on the monolayer-modified side. It was found that a concentration of [10.sup.-9] M [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] call be detected using this technology in a flow cell. Other anions, such as [Cl.sup.-], [Br.sup.-], [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], have minimal effect on the deflection of this cantilever. The mechanics of the bending and the chemistry of cantilever modification are discussed.

Published
2001

64. Supramolecular polymerization of a prebiotic nucleoside provides insights into the creation of sequence-controlled polymers

Author

Wang, Jun, primary, Bonnesen, Peter V., additional, Rangel, E., additional, Vallejo, E., additional, Sanchez-Castillo, Ariadna, additional, James Cleaves II, H., additional, Baddorf, Arthur P., additional, Sumpter, Bobby G., additional, Pan, Minghu, additional, Maksymovych, Petro, additional, and Fuentes-Cabrera, Miguel, additional

Published
2016
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