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X-WR-CALNAME:Global NMR Discussion Meetings
X-ORIGINAL-URL:https://www.globalnmr.org
X-WR-CALDESC:Events for Global NMR Discussion Meetings
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TZID:UTC
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DTSTART:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260616T150000
DTEND;TZID=UTC:20260616T160000
DTSTAMP:20260616T093522Z
CREATED:20260306T183038Z
LAST-MODIFIED:20260616T093522Z
UID:1790-1781622000-1781625600@www.globalnmr.org
SUMMARY:Yao Fu
DESCRIPTION:From Cryogenic to Room Temperature: Advances in DNP-MAS for\nMaterials Characterization \nThis presentation highlights recent advances in Dynamic Nuclear\nPolarization (DNP)-enhanced solid-state NMR spanning temperatures from\ncryogenic (30-100 K) to ambient conditions. At cryogenic temperatures\, cross-\neffect DNP was applied to a range of material systems\, including SiO₂\nnanoparticle-polymer composites\, conductive mesoporous polymers\, and the\nmetal-organic framework (MOF) UiO-66. In UiO-66\, DNP-enhanced NMR\nrevealed previously unrecognized water-induced structural rearrangements\, in\nwhich water molecules reversibly replace coordinating linkers to form\nhydrogen-bond-stabilized dangling groups. To overcome limitations associated\nwith exogenous polarizing agents and low-temperature operation\, room-\ntemperature Overhauser DNP was explored in trityl radical thin films relevant\nto OLED technologies. Efficient polarization transfer and site-resolved\nmeasurements of electron delocalization were achieved under ambient\nconditions. Together\, these studies illustrate the evolution of DNP methodologies\nacross a broad temperature range and highlight their growing potential for\ninvestigating increasingly complex and technologically relevant material\nsystems. \n8:00 AM California or 11:00 AM Boston or 5:00 PM Paris or 8:30 PM Delhi
URL:https://www.globalnmr.org/upcoming-discussions/yao-fu/
ATTACH;FMTTYPE=image/jpeg:https://www.globalnmr.org/wp-content/uploads/2026/03/Yao-Fu.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260630T150000
DTEND;TZID=UTC:20260630T160000
DTSTAMP:20260622T080336Z
CREATED:20260306T183219Z
LAST-MODIFIED:20260622T080336Z
UID:1792-1782831600-1782835200@www.globalnmr.org
SUMMARY:Yifan Quan
DESCRIPTION:Pentacene: excited triplet\, molecular spin\, polarizing agent\, or quantum sensor?  \nMolecular spin based quantum sensors offer a range of advantages\, from high spin density to functionalization via chemical tunability. Here\, we demonstrate AC vector sensing using the photoexcited spin triplet of deuterated pentacene molecules\, operating at zero external magnetic field and room temperature. We achieve full three-dimensional microwave field reconstruction by detecting the Rabi frequencies of anisotropic spin-triplet transitions associated with two crystallographic orientations of pentacene in naphthalene crystals. We further introduce a phase alternated protocol that extends the rotating-frame coherence time by an order of magnitude. Additionally\, we demonstrate a sizable increase in the coherence time of a pentacene electron spins by hyperpolarizing the proton spin bath via triplet dynamic nuclear polarization. The polarized nuclear spin bath provides a reduced magnetic noise environment\, leading to enhanced electron spin coherence. These results establish pentacene-based molecular spins as a practical and high-performance platform for microwave sensing and nuclear spin as a practical and controllable route to engineering the platform. \n8:00 AM California or 11:00 AM Boston or 5:00 PM Paris or 8:30 PM Delhi
URL:https://www.globalnmr.org/upcoming-discussions/yifan-quan/
ATTACH;FMTTYPE=image/jpeg:https://www.globalnmr.org/wp-content/uploads/2026/03/Yifan_Quan.jpg
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