Relaxation time measurement in liquids using compact NMR

Technobius physics., Journal Year: 2025, Volume and Issue: 3(1), P. 0027 - 0027

Published: March 21, 2025

This study investigates the influence of experimental parameters on accurate determination longitudinal and transverse relaxation times in liquids using compact nuclear magnetic resonance relaxometry. Water glycerin were selected as representative samples due to their contrasting viscosities behaviors. The primary objective was evaluate how repetition time, echo number data points, time step affect precision T₁ T₂ measurements. Longitudinal determined a variable method, while measured via multi-echo spin sequence. Exponential fitting algorithms employed extract from recorded signal amplitudes. For water, found be approximately 3.0 s for 1.423 T₂. In contrast, exhibited significantly shorter times, with estimated at 0.126 0.094 s. results demonstrated that estimation requires carefully optimized acquisition settings. Specifically, must exceed three value ensure full recovery, short high echoes are essential reliable determination. findings address critical methodological gap relaxometry protocols offer practical recommendations enhancing measurement accuracy simple liquids.

Language: Английский

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Unconventional Parahydrogen-Induced Hyperpolarization Effects in Chemistry and Catalysis: From Photoreactions to Enzymes

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 6386 - 6409

Published: April 4, 2025

Nuclear spin hyperpolarization utilizing parahydrogen has the potential for broad applications in chemistry, catalysis, biochemistry, and medicine. This review examines recent chemical biochemical insights gained using parahydrogen-induced polarization (PHIP). We begin with photoinduced PHIP, which allows investigation of short-lived photoactivated catalysis. Next, we partially negative line effect, distinctive shape helps to reveal information about rapid exchange role catalytic species. The NMR signal enhancement a single proton oneH-PHIP is discussed, challenging underpinning concept necessity pairwise hydrogenation. Furthermore, examine metal-free PHIP facilitated by frustrated Lewis pair molecular tweezers radicaloids, demonstrating alternative routes Although symmetric molecules incorporating are silent, showcase methods that hyperpolarized states through post-hydrogenation reactions. discuss processes mediate transfer between target, expanding reach without synthesizing specialized precursors. conclude this highlighting uncovering H2 activation mechanisms hydrogenases. By providing detailed these diverse phenomena, aim familiarize reader versatility its mechanistic studies analysis.

Language: Английский

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Rotating Polarization Magnetometry

Sensors, Journal Year: 2025, Volume and Issue: 25(9), P. 2682 - 2682

Published: April 24, 2025

Precise magnetometry is vital in numerous scientific and technological applications. At the forefront of sensitivity, optical atomic magnetometry, particularly techniques utilizing nonlinear magneto-optical rotation (NMOR), enables ultraprecise measurements across a broad field range. Despite their potential, these reportedly lose sensitivity higher magnetic fields, which attributed to alignment-to-orientation conversion (AOC) process. In our study, we utilized light with continuously rotating linear polarization avoid AOC, produced robust signals achieving high magnetometric over dynamic range nearly three times greater than Earth’s field. We demonstrated that employing surpasses other NMOR use modulated light. Our findings also indicate previously observed signal deterioration was not due suggesting an alternative cause for this decline.

Language: Английский

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