Laser-heated high-temperature NMR - a time-resolution study

Aled R. Jones; Rachel N. Shaw-West; Rudolf Winter; Dominique Massiot; Pierre Florian; Matthias Wolff

doi:10.1007/s00723-007-0035-y

Laser-heated high-temperature NMR - a time-resolution study

Aled R. Jones, Rachel N. Shaw-West, Rudolf Winter, Dominique Massiot, Pierre Florian, Matthias Wolff

Department of Physics

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Abstract

The time resolution achievable in in-situ high-temperature nuclear magnetic resonance (NMR) experiments is investigated using laser heating of refractory materials. Three case studies using 27Al in alumina nano-particles, 29Si in silicon carbide and 23Na in a glass-forming mixture of sodium carbonate and quartz have been conducted to distinguish the cases of (a) a fast-relaxing, high natural abundance nucleus, (b) a probe nucleus with low abundance and low spin-lattice relaxation rate, and (c) a complex and changing system of industrial relevance. The most suitable nucleus for in-situ high-temperature studies is one with high abundance but slow relaxation because the differential relaxation time between hot and cold parts of the sample effectively removes the signal from the cold material. There is no ``in-situ penalty'' from the diminishing Boltzmann polarisation at high temperature since this effect is balanced by a corresponding increase of the spin-lattice relaxation rate.

Original language	English
Pages (from-to)	635-646
Journal	Applied Magnetic Resonance
Volume	32
Issue number	4
DOIs	https://doi.org/10.1007/s00723-007-0035-y
Publication status	Published - 30 Jan 2007

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title = "Laser-heated high-temperature NMR - a time-resolution study",

abstract = "The time resolution achievable in in-situ high-temperature nuclear magnetic resonance (NMR) experiments is investigated using laser heating of refractory materials. Three case studies using 27Al in alumina nano-particles, 29Si in silicon carbide and 23Na in a glass-forming mixture of sodium carbonate and quartz have been conducted to distinguish the cases of (a) a fast-relaxing, high natural abundance nucleus, (b) a probe nucleus with low abundance and low spin-lattice relaxation rate, and (c) a complex and changing system of industrial relevance. The most suitable nucleus for in-situ high-temperature studies is one with high abundance but slow relaxation because the differential relaxation time between hot and cold parts of the sample effectively removes the signal from the cold material. There is no ``in-situ penalty'' from the diminishing Boltzmann polarisation at high temperature since this effect is balanced by a corresponding increase of the spin-lattice relaxation rate.",

author = "Jones, {Aled R.} and Shaw-West, {Rachel N.} and Rudolf Winter and Dominique Massiot and Pierre Florian and Matthias Wolff",

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T1 - Laser-heated high-temperature NMR - a time-resolution study

AU - Jones, Aled R.

AU - Shaw-West, Rachel N.

AU - Winter, Rudolf

AU - Massiot, Dominique

AU - Florian, Pierre

AU - Wolff, Matthias

N1 - Submitted to Appl Magn Reson Sponsorship: EPSRC / EU

PY - 2007/1/30

Y1 - 2007/1/30

N2 - The time resolution achievable in in-situ high-temperature nuclear magnetic resonance (NMR) experiments is investigated using laser heating of refractory materials. Three case studies using 27Al in alumina nano-particles, 29Si in silicon carbide and 23Na in a glass-forming mixture of sodium carbonate and quartz have been conducted to distinguish the cases of (a) a fast-relaxing, high natural abundance nucleus, (b) a probe nucleus with low abundance and low spin-lattice relaxation rate, and (c) a complex and changing system of industrial relevance. The most suitable nucleus for in-situ high-temperature studies is one with high abundance but slow relaxation because the differential relaxation time between hot and cold parts of the sample effectively removes the signal from the cold material. There is no ``in-situ penalty'' from the diminishing Boltzmann polarisation at high temperature since this effect is balanced by a corresponding increase of the spin-lattice relaxation rate.

AB - The time resolution achievable in in-situ high-temperature nuclear magnetic resonance (NMR) experiments is investigated using laser heating of refractory materials. Three case studies using 27Al in alumina nano-particles, 29Si in silicon carbide and 23Na in a glass-forming mixture of sodium carbonate and quartz have been conducted to distinguish the cases of (a) a fast-relaxing, high natural abundance nucleus, (b) a probe nucleus with low abundance and low spin-lattice relaxation rate, and (c) a complex and changing system of industrial relevance. The most suitable nucleus for in-situ high-temperature studies is one with high abundance but slow relaxation because the differential relaxation time between hot and cold parts of the sample effectively removes the signal from the cold material. There is no ``in-situ penalty'' from the diminishing Boltzmann polarisation at high temperature since this effect is balanced by a corresponding increase of the spin-lattice relaxation rate.

U2 - 10.1007/s00723-007-0035-y

DO - 10.1007/s00723-007-0035-y

M3 - Article

SN - 0937-9347

VL - 32

SP - 635

EP - 646

JO - Applied Magnetic Resonance

JF - Applied Magnetic Resonance

IS - 4

ER -

Laser-heated high-temperature NMR - a time-resolution study

Abstract

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