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31 results on '"Torelli, Marco D."'

5. Electron irradiation-induced paramagnetic and fluorescent defects in type Ib high pressure–high temperature microcrystalline diamonds and their evolution upon annealing.

Author

Nunn, Nicholas, Milikisiyants, Sergey, Danilov, Evgeny O., Torelli, Marco D., Dei Cas, Laura, Zaitsev, Alexander, Shenderova, Olga, Smirnov, Alex I., and Shames, Alexander I.

Subjects
ELECTRON beams, NANODIAMONDS, ELECTRON paramagnetic resonance, ELECTRON paramagnetic resonance spectroscopy, DIAMONDS, HIGH temperatures, OPTICAL engineering
Abstract

Defects introduced to synthetic type Ib diamond micrometer-size particles by electron-beam irradiation were studied by electron paramagnetic resonance and photoluminescence (PL) spectroscopy as a function of e-beam fluence and post-irradiation thermal annealing. Increasing electron-beam fluence causes a substantial reduction of the substitutional nitrogen (P1) content, accompanied by progressively higher concentrations of paramagnetic negatively charged vacancies (V−) and triplet interstitials (R1/R2). Annealing results in a drastic decrease in the V− and R1/R2 content and an increase in the negatively charged nitrogen-vacancies (NV− or W15). Analysis of PL spectra allows for identification of color centers in the irradiated diamond samples and following their evolution after annealing. These data facilitate understanding of different factors contributing to the formation of color centers in diamond and promote efforts toward controlled engineering of optical centers in fluorescent diamond particles. [ABSTRACT FROM AUTHOR]

Published
2022
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6. Lipid Corona Formation from Nanoparticle Interactions with Bilayers

Author

Olenick, Laura L., Troiano, Julianne M., Vartanian, Ariane, Melby, Eric S., Mensch, Arielle C., Zhang, Leili, Hong, Jiewei, Mesele, Oluwaseun, Qiu, Tian, Bozich, Jared, Lohse, Samuel, Zhang, Xi, Kuech, Thomas R., Millevolte, Augusto, Gunsolus, Ian, McGeachy, Alicia C., Doğangün, Merve, Li, Tianzhe, Hu, Dehong, Walter, Stephanie R., Mohaimani, Aurash, Schmoldt, Angela, Torelli, Marco D., Hurley, Katherine R., Dalluge, Joe, Chong, Gene, Feng, Z. Vivian, Haynes, Christy L., Hamers, Robert J., Pedersen, Joel A., Cui, Qiang, Hernandez, Rigoberto, Klaper, Rebecca, Orr, Galya, Murphy, Catherine J., and Geiger, Franz M.

Published
2018
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11. High Temperature Treatment of Diamond Particles Toward Enhancement of Their Quantum Properties

Author

Torelli, Marco D., primary, Nunn, Nicholas A., additional, Jones, Zachary R., additional, Vedelaar, Thea, additional, Padamati, Sandeep Kumar, additional, Schirhagl, Romana, additional, Hamers, Robert J., additional, Shames, Alexander I., additional, Danilov, Evgeny O., additional, Zaitsev, Alexander, additional, and Shenderova, Olga A., additional

Published
2020
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17. Impacts of gold nanoparticle charge and ligand type on surface binding and toxicity to Gram-negative and Gram-positive bacteria† †Electronic supplementary information (ESI) available: Representative transmission electron micrographs of AuNPs, sample images from colony counting assays, representative cytograms, calculation to determine PAH-ligand concentrations on PAH–AuNPs, and a video of dark field TEM images of Bacillus cells with PAH–AuNPs. See DOI: 10.1039/c5sc00792e Click here for additional data file. Click here for additional data file

Author

Feng, Z. Vivian, Gunsolus, Ian L., Qiu, Tian A., Hurley, Katie R., Nyberg, Lyle H., Frew, Hilena, Johnson, Kyle P., Vartanian, Ariane M., Jacob, Lisa M., Lohse, Samuel E., Torelli, Marco D., Hamers, Robert J., Murphy, Catherine J., and Haynes, Christy L.

Subjects
Chemistry
Abstract

Higher cationic charge density on nanoparticles is correlated with higher toxicity to bacteria., Although nanomaterials facilitate significant technological advancement in our society, their potential impacts on the environment are yet to be fully understood. In this study, two environmentally relevant bacteria, Shewanella oneidensis and Bacillus subtilis, have been used as model organisms to elucidate the molecular interactions between these bacterial classes and Au nanoparticles (AuNPs) with well-controlled and well-characterized surface chemistries: anionic 3-mercaptopropionic acid (MPA), cationic 3-mercaptopropylamine (MPNH2), and the cationic polyelectrolyte poly(allylamine hydrochloride) (PAH). The data demonstrate that cationic, especially polyelectrolyte-wrapped AuNPs, were more toxic to both the Gram-negative and Gram-positive bacteria. The levels of toxicity observed were closely related to the percentage of cells with AuNPs associated with the cell surface as measured in situ using flow cytometry. The NP concentration-dependent binding profiles were drastically different for the two bacteria strains, suggesting the critical role of bacterial cell surface chemistry in determining nanoparticle association, and thereby, biological impact.

Published
2015

18. Fluorescent single-digit detonation nanodiamond for biomedical applications

Author

Nunn, Nicholas, primary, d’Amora, Marta, additional, Prabhakar, Neeraj, additional, Panich, Alexander M, additional, Froumin, Natalya, additional, Torelli, Marco D, additional, Vlasov, Igor, additional, Reineck, Philipp, additional, Gibson, Brant, additional, Rosenholm, Jessica M, additional, Giordani, Silvia, additional, and Shenderova, Olga, additional

Published
2018
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19. Lipid Corona Formation from Nanoparticle Interactions with Bilayers and Membrane-Specific Biological Outcomes

Author

Olenick, Laura L., primary, Troiano, Julianne M., primary, Vartanian, Ariane, primary, Melby, Eric S., primary, Mensch, Arielle C, primary, Zhang, Leili, primary, Hong, Jiewei, primary, Qiu, Tian, primary, Bozich, Jared, primary, Lohse, Samuel, primary, Zhang, Xi, primary, Kuech, Thomas R, primary, Millevolte, Augusto, primary, Gunsolus, Ian, primary, McGeachy, Alicia C., primary, Dogangun, Merve, primary, Li, Tianzhe, primary, Hu, Dehong, primary, Walter, Stephanie R., primary, Mohaimani, Aurash, primary, Schmoldt, Angela, primary, Torelli, Marco D., primary, Hurley, Katherine R., primary, Dalluge, Joe, primary, Chong, Gene, primary, Feng, Z. Vivian, primary, Haynes, Christy L., primary, Hamers, Robert J., primary, Pedersen, Joel A., primary, Cui, Qiang, primary, Hernandez, Rigoberto, primary, Klaper, Rebecca, primary, Orr, Galya, primary, Murphy, Catherine J., primary, and Geiger, Franz, primary

Published
2017
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25. Direct Probes of 4 nm Diameter Gold Nanoparticles Interacting with Supported Lipid Bilayers

Author

Troiano, Julianne M., primary, Olenick, Laura L., additional, Kuech, Thomas R., additional, Melby, Eric S., additional, Hu, Dehong, additional, Lohse, Samuel E., additional, Mensch, Arielle C., additional, Dogangun, Merve, additional, Vartanian, Ariane M., additional, Torelli, Marco D., additional, Ehimiaghe, Eseohi, additional, Walter, Stephanie R., additional, Fu, Li, additional, Anderton, Christopher R., additional, Zhu, Zihua, additional, Wang, Hongfei, additional, Orr, Galya, additional, Murphy, Catherine J., additional, Hamers, Robert J., additional, Pedersen, Joel A., additional, and Geiger, Franz M., additional

Published
2014
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29. Direct Probes of 4 nm Diameter Gold Nanoparticles Interacting with Supported Lipid Bilayers

Author

Troiano, Julianne M., Olenick, Laura L., Kuech, Thomas R., Melby, Eric S., Hu, Dehong, Lohse, Samuel E., Mensch, Arielle C., Dogangun, Merve, Vartanian, Ariane M., Torelli, Marco D., Ehimiaghe, Eseohi, Walter, Stephanie R., Fu, Li, Anderton, Christopher R., Zhu, Zihua, Wang, Hongfei, Orr, Galya, Murphy, Catherine J., Hamers, Robert J., Pedersen, Joel A., and Geiger, Franz M.

Abstract

This work presents molecular-level investigations of how well-characterized silica-supported phospholipid bilayers formed from either pure DOPC or a 9:1 mixture of DOPC:DOTAP interact with positively and negatively charged 4 nm gold metal nanoparticles at pH 7.4 and NaCl concentrations ranging from 0.001 to 0.1 M. Second harmonic generation (SHG) charge screening measurements indicate the supported bilayers carry a negative interfacial potential. Resonantly enhanced SHG measurements probing electronic transitions within the gold core of the nanoparticles show the particles interact irreversibly with the supported bilayers at a range of concentrations. At 0.1 M NaCl, surface coverages for the particles functionalized with the negatively charged ligand mercaptopropionic acid (MPA) or wrapped in the cationic polyelectrolyte poly(allylamine) hydrochloride (PAH) are estimated from a joint analysis of QCM-D, XPS, AFM, and ToF-SIMS to be roughly 1 × 107and 1 × 1011particles cm–2, respectively. Results from complementary SHG charge screening experiments point to the possibility that the surface coverage of the MPA-coated particles is more limited by interparticle Coulomb repulsion due to the charges within their hydrodynamic volumes than with the PAH-wrapped particles. Yet, SHG adsorption isotherms indicate that the interaction strength per particle is independent of ionic strength and particle coating, highlighting the importance of multivalent interactions. 1H NMR spectra of the lipids within vesicles suspended in solution show little change upon interaction with either particle type but indicate loosening of the gold-bound PAH polymer wrapping upon attachment to the vesicles. The thermodynamic, spectroscopic, and electrostatic data presented here may serve to benchmark experimental and computational studies of nanoparticle attachment processes at the nano–bio interface.

Published
2015
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30. High-precision chemical quantum sensing in flowing monodisperse microdroplets.

Author

Sarkar A, Jones ZR, Parashar M, Druga E, Akkiraju A, Conti S, Krishnamoorthi P, Nachuri S, Aman P, Hashemi M, Nunn N, Torelli MD, Gilbert B, Wilson KR, Shenderova OA, Tanjore D, and Ajoy A

Abstract

A method is presented for high-precision chemical detection that integrates quantum sensing with droplet microfluidics. Using nanodiamonds (ND) with fluorescent nitrogen-vacancy (NV) centers as quantum sensors, rapidly flowing microdroplets containing analyte molecules are analyzed. A noise-suppressed mode of optically detected magnetic resonance is enabled by pairing controllable flow with microwave control of NV electronic spins, to detect analyte-induced signals of a few hundredths of a percent of the ND fluorescence. Using this method, paramagnetic ions in droplets are detected with low limit-of-detection using small analyte volumes, with exceptional measurement stability over >10 3 s. In addition, these droplets are used as microconfinement chambers by co-encapsulating ND quantum sensors with various analytes such as single cells, suggesting wide-ranging applications including single-cell metabolomics and real-time intracellular measurements from bioreactors. Important advances are enabled by this work, including portable chemical testing devices, amplification-free chemical assays, and chemical imaging tools for probing reactions within microenvironments.

Published
2024
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31. A citric acid-derived ligand for modular functionalization of metal oxide surfaces via "click" chemistry.

Author

Bishop LM, Yeager JC, Chen X, Wheeler JN, Torelli MD, Benson MC, Burke SD, Pedersen JA, and Hamers RJ

Subjects
Catalysis, Ligands, Metal Nanoparticles, Microscopy, Electron, Scanning, Surface Properties, Citric Acid chemistry, Metals chemistry, Oxides chemistry
Abstract

Citric acid is a widely used surface-modifying ligand for growth and processing of a variety of nanoparticles; however, the inability to easily prepare derivatives of this molecule has restricted the development of versatile chemistries for nanoparticle surface functionalization. Here, we report the design and synthesis of a citric acid derivative bearing an alkyne group and demonstrate that this molecule provides the ability to achieve stable, multidentate carboxylate binding to metal oxide nanoparticles, while also enabling subsequent multistep chemistry via the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. The broad utility of this strategy for the modular functionalization of metal oxide surfaces was demonstrated by its application in the CuAAC modification of ZnO, Fe(2)O(3), TiO(2), and WO(3) nanoparticles., (© 2011 American Chemical Society)

Published
2012
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