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Start Over Author "Zachary M" Publisher american chemical society
271 results on '"Zachary M"'

14. A Data Deposition Platform for Sharing Nuclear Magnetic Resonance Data.

Author

Pin, Matthew, Poynton, Ella F., Jordan, Tamara, Kim, Jonghyeok, Ledingham, Benjamin, van Santen, Jeffrey A., Yang, Vera, Maras, Andrew, Tavangar, Pegah, Gautam, Vasuk, Peters, Harrison, Sajed, Tanvir, Lee, Brian L., Shreffler, Hailey A., Koller, James T., Tretter, Zachary M., Cort, John R., Sumner, Lloyd W., Wishart, David S., and Linington, Roger G.

Published
2023
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19. Design and Optimization of Novel Competitive, Non-peptidic, SARS-CoV‑2 Mpro Inhibitors.

Author

Jacobs, Leon, van der Westhuyzen, Aletta, Pribut, Nicole, Dentmon, Zackery W., Cui, Dan, D'Erasmo, Michael P., Bartsch, Perry W., Liu, Ken, Cox, Robert M., Greenlund, Sujay F., Plemper, Richard K., Mitchell, Deborah, Marlow, Joshua, Andrews, Meghan K., Krueger, Rebecca E., Sticher, Zachary M., Kolykhalov, Alexander A., Natchus, Michael G., Zhou, Bin, and Pelly, Stephen C.

Published
2023
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24. Lighting Up at High Potential: Effects of Voltage and Emitter Size in Nanoelectrospray Ionization.

Author

Jordan, Jacob S., Miller, Zachary M., Harper, Conner C., Hanozin, Emeline, and Williams, Evan R.

Abstract

Effects of electrospray voltage on cluster size and abundance formed from aqueous CsI were investigated with emitter tip diameters between 260 ± 7 nm and 2.45 ± 0.30 μm. Cluster size increases with increasing voltage, increasing solution concentration and increasing emitter diameter consistent with formation of larger initial droplet sizes. For emitters with tip diameters above ∼1 μm, varying the voltage either up or down leads to reproducible voltage-dependent extents of cluster formation. In contrast, higher voltages with submicron diameter emitters can lead to only Cs+ and Cs-(H2O)+ and no clusters. This change in ion formation reproducibly occurs at spray potentials >1.3 kV for 260 nm emitters and appears to be induced by a corona discharge and material build-up at the emitter tip. Under conditions where abundant Cs+ is observed and no clusters are formed, ions such as K+ and Cu1+ are also observed but ions with more negative solvation energies, such as Ba2+, are not. Similarly, ions from bradykinin and ubiquitin are observed predischarge but not post discharge. Ions with more positive solvation energies can desorb directly from the air–water interface that is created at the tip of these emitters, whereas ions with more negative solvation energies as well as peptide and protein ions do not. These results indicate that ion desorption directly from solution can occur, and similar experiments with even smaller emitters may lead to new insights into ion formation in electrospray ionization. [ABSTRACT FROM AUTHOR]

Published
2023
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25. The Fate of Nutrients and Pesticides in the Urban Environment

Author

Jim Skillen, Wayne R. Kussow, Zachary M. Easton, A. Martin Petrovic, Zachary M. Easton, A. Martin Petrovic, Kevin W. Frank, K. W. King, J. C. Balogh, D. Kohlbry, Douglas J. Soldat, A. Martin Petrovic, Harold M. van Es, D. M. Park, J. L. Cisar, J. E. Erickson, G. H. Snyder, Gregory E. Bell, Justin Q.

Published
2008

27. Plasmonic Response of Complex Nanoparticle Assemblies.

Author

Sherman, Zachary M., Kim, Kihoon, Kang, Jiho, Roman, Benjamin J., Crory, Hannah S. N., Conrad, Diana L., Valenzuela, Stephanie A., Lin, Emily, Dominguez, Manuel N., Gibbs, Stephen L., Anslyn, Eric V., Milliron, Delia J., and Truskett, Thomas M.

Published
2023
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33. Apodization Specific Fitting for Improved Resolution, Charge Measurement, and Data Analysis Speed in Charge Detection Mass Spectrometry.

Author

Miller, Zachary M., Harper, Conner C., Lee, Hyuncheol, Bischoff, Amanda J., Francis, Matthew B., Schaffer, David V., and Williams, Evan R.

Abstract

Short-time Fourier transforms with short segment lengths are typically used to analyze single ion charge detection mass spectrometry (CDMS) data either to overcome effects of frequency shifts that may occur during the trapping period or to more precisely determine the time at which an ion changes mass or charge, or enters an unstable orbit. The short segment lengths can lead to scalloping loss unless a large number of zero-fills are used, making computational time a significant factor in real-time analysis of data. Apodization specific fitting leads to a 9-fold reduction in computation time compared to zero-filling to a similar extent of accuracy. This makes possible real-time data analysis using a standard desktop computer. Rectangular apodization leads to higher resolution than the more commonly used Gaussian or Hann apodization and makes it possible to separate ions with similar frequencies, a significant advantage for experiments in which the masses of many individual ions are measured simultaneously. Equally important is a >20% increase in S/N obtained with rectangular apodization compared to Gaussian or Hann, which directly translates to a corresponding improvement in accuracy of both charge measurements and ion energy measurements that rely on the amplitudes of the fundamental and harmonic frequencies. Combined with computing the fast Fourier transform in a lower-level language, this fitting procedure eliminates computational barriers and should enable real-time processing of CDMS data on a laptop computer. [ABSTRACT FROM AUTHOR]

Published
2022
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34. Metal–Organic Frameworks on Palladium Nanoparticle–Functionalized Carbon Nanotubes for Monitoring Hydrogen Storage.

Author

Hwang, Sean I., Sopher, Emmy M., Zeng, Zidao, Schulte, Zachary M., White, David L., Rosi, Nathaniel L., and Star, Alexander

Abstract

Palladium is a well-known hydrogen-absorbing material. When palladium is functionalized with copper-(II) benzene-1,3,5-tricarboxylate (HKUST-1), a hydrogen-adsorbing metal–organic framework, its hydrogen-absorption capacity can be increased. In this work, we show that, by growing the HKUST-1 on palladium nanoparticle-functionalized single-walled carbon nanotubes (Pd NP/SWCNT), we can dynamically monitor the adsorption and desorption of hydrogen from the HKUST-1 and Pd NP composite by using the carbon nanotubes as transducers in chemiresistors. Addition of HKUST-1 to the Pd NP/SWCNT was shown to increase the sensitivity of the nanocomposite material to hydrogen by 300% and limit of detection to hydrogen by 33%. The increase in sensitivity was attributed to the increased hydrogen sorption capacity of the combined HKUST-1/Pd NP. A factor of 8 improvement in sensitivity was further achieved by using semiconductor-enriched SWCNT instead of mixed metallic/semiconducting nanotubes and a corresponding improvement in the theoretical limit of detection down to 70 ppb. [ABSTRACT FROM AUTHOR]

Published
2022
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43. A dendronized polymer is a single-molecule glass

Author

Das, Jayajit, Yoshida, Masaru, Fresco, Zachary M., Tae-Lim Choi, Frechet J.M.J., and Chakraborty, Arup K.

Subjects
Chemistry, Physical and theoretical -- Research, Thermodynamics -- Research, Polymers -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The thermodynamic and dynamic features of a single dendronized polymer as the number of generations characterizing each dendron increases are described. The findings indicate that the single-molecule glassy system constitutes a building block for creating self-assembled nanoscale objects for advanced applications.

Published
2005

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