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Aurélien Bornet

Cette personne a quitté l’EPFL

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Publications associées (48)

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Hyperpolarization of nitrogen-15 nuclei by cross polarization and dissolution dynamic nuclear polarization

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud

Dynamic Nuclear Polarization (DNP) is often achieved by the direct transfer of polarization from electrons to nuclei such as C-13, induced by microwave saturation of the wings of narrow EPR lines of radicals like trityl. In the indirect approach on the oth ...

Amer Inst Physics2017

Structured and porous materials particularly suitable as polarizing agents in dissolution dynamic nuclear polarization

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, David Lyndon Emsley

The present invention concerns materials consisting in a porous and structured network, this network being at least in part formed by Si atoms, or Si atoms and metal atoms, linked to each other by oxy bridges, comprising organic molecules which include at ...

2016

Hyperpolarized Water to Study Protein-Ligand Interactions

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud

The affinity between a chosen target protein and small molecules is a key aspect of drug discovery. Screening by popular NMR methods such as Water-LOGSY suffers from low sensitivity and from false positives caused by aggregated or denatured proteins. This ...

2015

Method and device for rapid dnp

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet

A method for producing hyperpolarized sample material for use in magnetic resonance investigations, with a) preparing a target material, containing high gamma nuclei with a short T1, - a polarizing agent with a broad EPR line, and low gamma nuclei with a l ...

2013

Nonclassical Nucleation and Crystallization of LiNbO3 Nanoparticles from the Aqueous Solvothermal Alkoxide Route

Sandrine Gerber, Aurélien Bornet, Adrian Stefan Gheata

The exact molecular reaction pathway and crystallization mechanisms of LiNbO3 nanoparticles under solvothermal conditions are derived through extensive time- and temperature-resolved experiments allowing to track all the transient molecular and solid speci ...

Wiley-V C H Verlag Gmbh2023

Homonuclear decoupling for spectral simplification of carbon-13 enriched molecules in solution-state NMR enhanced by dissolution DNP

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Diego Carnevale, Srinivas Chinthalapalli

Complex overlapping multiplets due to scalar couplings (n)J(C-13, C-13) in fully C-13-enriched molecules can be simplified by polychromatic irradiation of selected spins. The signal intensities of the remaining non-irradiated signals are proportional to th ...

Royal Society of Chemistry2016

Spin Noise Detection of Nuclear Hyperpolarization at 1.2K

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud

We report proton spin noise spectra of a hyperpolarized solid sample of commonly used DNP (dynamic nuclear polarization) juice containing TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidine N-oxide) and irradiated by a microwave field at a temperature of 1.2K ...

Wiley-Blackwell2015

Hyperpolarized para-Ethanol

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud, Daniele Mammoli

We show that an imbalance between the populations of singlet (S) and triplet (T) states in pairs of magnetically equivalent spins can be generated by dissolution dynamic nudear polarization: In partly deuterated ethanol ((CD3CH2OD)-C-13), this T/S imbalanc ...

Amer Chemical Soc2015

Cross polarization from H-1 to quadrupolar Li-6 nuclei for dissolution DNP

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud, Angel Joaquin Perez Linde

Cross polarization from protons to quadrupolar Li-6 nuclei is combined with dynamic nuclear polarization of protons at 1.2 K and 6.7 T using TEMPOL as a polarizing agent followed by rapid dissolution. Compared to direct Li-6 DNP without cross-polarization, ...

Royal Society of Chemistry2014

Ultra High-Resolution NMR: Sustained Induction Decays of Long-Lived Coherences

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet

Long-lived coherences (LLCs) in homonuclear pairs of chemically inequivalent spins can be excited and sustained during protracted radio frequency irradiation periods that alternate with brief windows for signal observation. Fourier transformation of the su ...

2011

Long-Lived States to Monitor Protein Unfolding by Proton NMR

Geoffrey Bodenhausen, Riddhiman Sarkar, Aurélien Bornet, Paul Romeo Vasos, Puneet Ahuja

The relaxation of long-lived states (LLS) corresponds to the slow return to statistical thermal equilibrium between symmetric and antisymmetric proton spin states. This process is remarkably sensitive to the presence of external spins and can be used to ob ...

Wiley-Blackwell2011

Transportable hyperpolarized metabolites

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud, Xiao Ji, David Lyndon Emsley, Aaron James Rossini

Nuclear spin hyperpolarization of C-13-labelled metabolites by dissolution dynamic nuclear polarization can enhance the NMR signals of metabolites by several orders of magnitude, which has enabled in vivo metabolic imaging by MRI. However, because of the s ...

Nature Publishing Group2017

Cross-Reactive Alginate Derivatives for the Production of Dual Ionic−Covalent Hydrogel Microspheres Presenting Tunable Properties for Cell Microencapsulation

Sandrine Gerber, Aurélien Bornet, François Rémi Pierre Noverraz, Luca Szabó

The production of hydrogel micropsheres (MS) presenting physical, mechanical, and biological properties which can be modulated by their chemical composition is required to enlarge the panel of biomaterials for cell transplantation therapies. Functionalizat ...

2019

Dynamic Nuclear Polarization and Other Magnetic Ideas at EPFL

Geoffrey Bodenhausen, Martial Rey, Sami Jannin, Aurélien Bornet, Jonas Milani, Simone Ulzega, Pascal Miéville, Marc Anthony Caporini, Nicola Salvi, Diego Carnevale, Roberto Buratto, Srinivas Chinthalapalli, Shutao Wang, Daniele Mammoli, Angel Joaquin Perez Linde

Although nuclear magnetic resonance (NMR) can provide a wealth of information, it often suffers from a lack of sensitivity. Dynamic Nuclear Polarization (DNP) provides a way to increase the polarization and hence the signal intensities in NMR spectra by tr ...

2012

An automated system for fast transfer and injection of hyperpolarized solutions

Aurélien Bornet, Jonas Milani

Dissolution dynamic nuclear polarization (dDNP) has become a hyperpolarization method of choice for enhancing nuclear magnetic resonance (NMR) signals. Nuclear spins are polarized in solid frozen samples (in a so-called polarizer) that are subsequently dis ...

Elsevier2021

Microwave frequency modulation to enhance Dissolution Dynamic Nuclear Polarization Dedicated to To Martial Rey, as a token of appreciation

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud, Angel Joaquin Perez Linde

Hyperpolarization by Dissolution Dynamic Nuclear Polarization is usually achieved by monochromatic microwave irradiation of the ESR spectrum of free radicals embedded in glasses at 1.2 K and 3.35 T. Hovav et al. (2014) have recently shown that by using fre ...

Elsevier2014

Low-temperature cross polarization in view of enhancing dissolution Dynamic Nuclear Polarization in NMR

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet

Dynamic Nuclear Polarization (DNP) induced by saturation of ESR transitions of TEMPO at 1.2 K and 3.35 T is characterized by build-up rates that are typically 5 times faster for protons than for the carboxylic carbon-13 in acetate. We show that cross polar ...

Elsevier2011

A magnetic tunnel to shelter hyperpolarized fluids

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Pascal Miéville, Basile Vuichoud

To shield solutions carrying hyperpolarized nuclear magnetization from rapid relaxation during transfer through low fields, the transfer duct can be threaded through an array of permanent magnets. The advantages are illustrated for solutions containing hyp ...

American Institute of Physics2015

Highly Repeatable Dissolution Dynamic Nuclear Polarization for Heteronuclear NMR Metabolomics

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet, Jonas Milani, Basile Vuichoud, Xiao Ji

At natural C-13 abundance, metabolomics based on heteronuclear NMR is limited by sensitivity. We have recently demonstrated how hyperpolarization by dissolution dynamic nuclear polarization (D-DNP) assisted by cross-polarization (CP) provides a reliable wa ...

Amer Chemical Soc2016

Procédé de spectroscopie RMN avec dégradations d'induction prolongée de cohérences aux temps de vie longs

Geoffrey Bodenhausen, Sami Jannin, Aurélien Bornet

A Method for nuclear magnetic resonance (NMR) spectroscopy of a sample comprising the following steps: (a) excitation of long lived coherences (LLC) between the singlet state So and the central triplet state To of nuclei of the sample by initiating irradia ...

2014