Michael Mardini
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View article: Dynamic Nuclear Polarization with P1 Centers in Diamond
Dynamic Nuclear Polarization with P1 Centers in Diamond Open
Substitutional nitrogen impurities within the diamond lattice, known as P1 centers, have unpaired electrons that can mediate microwave driven dynamic nuclear polarization (DNP). In this paper we explore DNP of the bulk 13C spins in microme…
View article: Dipolar Recoupling in Rotating Solids
Dipolar Recoupling in Rotating Solids Open
Magic angle spinning (MAS) nuclear magnetic resonance (NMR) has evolved significantly over the past three decades and established itself as a vital tool for the structural analysis of biological macromolecules and materials. This review de…
View article: Resonant Mixing Dynamic Nuclear Polarization
Resonant Mixing Dynamic Nuclear Polarization Open
We propose a mechanism for dynamic nuclear polarization that is different from the well-known Overhauser effect, solid effect, cross effect, and thermal mixing processes. We term it Resonant Mixing (RM), and we show that it arises from the…
View article: Coherent Dynamic Nuclear Polarization using Chirped Pulses
Coherent Dynamic Nuclear Polarization using Chirped Pulses Open
This paper presents a study of coherent dynamic nuclear polarization (DNP) using frequency swept pulses at 94 GHz which optimize the polarization transfer efficiency. Accordingly, an enhancement ε ∼ 496 was observed using 10 mM trityl-OX06…
View article: Coherent Dynamic Nuclear Polarization using Chirped Pulses
Coherent Dynamic Nuclear Polarization using Chirped Pulses Open
This paper presents a study of coherent dynamic nuclear polarization (DNP) using frequency swept pulses at 94 GHz which optimize the polarization transfer efficiency. Accordingly, an enhancement ℇ∼496 was observed using 10mM trityl-OX063 a…
View article: Resonant Mixing Dynamic Nuclear Polarization
Resonant Mixing Dynamic Nuclear Polarization Open
We propose a new mechanism for dynamic nuclear polarization that is different from the well-known Overhauser effect, solid effect, cross effect and thermal mixing processes. In particular, we discovered that the evolution of the density ma…
View article: Amplified Overhauser DNP with Selective Deuteration: Attenuation of Double-Quantum Cross-Relaxation
Amplified Overhauser DNP with Selective Deuteration: Attenuation of Double-Quantum Cross-Relaxation Open
We recently used selective 2H labeling of BDPA to investigate the Overhauser Effect (OE) dynamic nuclear polarization (DNP) mechanism in insulating solids doped with 1,3-bis(diphenylene)-2-phenylallyl (BDPA), and established that the α and…
View article: Room-Temperature Quantitative Quantum Sensing of Lithium Ions with a Radical-Embedded Metal–Organic Framework
Room-Temperature Quantitative Quantum Sensing of Lithium Ions with a Radical-Embedded Metal–Organic Framework Open
Recent advancements in quantum sensing have sparked transformative detection technologies with high sensitivity, precision, and spatial resolution. Owing to their atomic-level tunability, molecular qubits and ensembles thereof are promisin…
View article: Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling
Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling Open
Dynamic nuclear polarization (DNP) is an NMR sensitivity enhancement technique that mediates polarization transfer from unpaired electrons to NMR‐active nuclei. Despite its success in elucidating important structural information on biologi…
View article: Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling
Observing Nearby Nuclei on Paramagnetic Trityls and MOFs via DNP and Electron Decoupling Open
Dynamic nuclear polarization (DNP) is an NMR sensitivity enhancement technique that mediates polarization transfer from unpaired electrons to NMR-active nuclei. Despite its success in elucidating important structural information on biologi…
Room-Temperature Quantitative Quantum Sensing of Lithium Ions with a Radical-Embedded Metal‒Organic Framework Open
Recent advancements in quantum sensing have sparked transformative detection technologies with high sensitivity, precision, and spatial resolution. Owing to their atomic-level tunability, molecular qubits and ensembles thereof are promisin…
Overhauser Dynamic Nuclear Polarization with Selectively Deuterated BDPA Radicals Open
The Overhauser effect (OE), commonly observed in NMR spectra of liquids and conducting solids, was recently discovered in insulating solids doped with the radical 1,3-bisdiphenylene-2-phenylallyl (BDPA). However, the mechanism of polarizat…
Three-spin solid effect and the spin diffusion barrier in amorphous solids Open
Using the three-spin solid effect, the spin diffusion barrier of the DNP polarizing agent trityl is found to be <6 Å.