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Updated: Jul 27, 2026
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MALDI Sample Preparation: the Ultra Thin Layer Method
Published on: April 29, 2007
Temperature calibration under ultrafast MAS conditions
Summary
Sample heating from friction during fast magic-angle spinning (MAS) increases with speed. Researchers quantified this effect using a chemical shift thermometer, providing a formula to determine sample temperature under ultrafast MAS conditions.
Area of Science:
- Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
- Materials Science
- Physical Chemistry
Background:
- Conventional fast magic-angle spinning (MAS) frequencies (<15 kHz) are known to cause sample heating due to rotor-bearing gas friction.
- Ultrafast MAS frequencies (up to 35 kHz) are expected to exacerbate this frictional heating effect significantly.
Purpose of the Study:
- To quantify the frictional heating of samples under ultrafast MAS conditions.
- To calibrate sample temperature during high-speed MAS.
- To develop a predictive model for sample temperature based on experimental parameters.
Main Methods:
- Utilized the 119Sn NMR signal of the chemical shift thermometer Sm2Sn2O7.
- Measured sample temperature as a function of bearing gas temperature and spinning frequency.
- Quantified frictional heating effects at MAS frequencies up to 35 kHz.
Main Results:
- Frictional heating is a significant factor at ultrafast MAS frequencies.
- A calibration method for sample temperature under these conditions was established.
- An empirical expression was derived to predict sample temperature.
Conclusions:
- The study successfully quantified frictional heating under ultrafast MAS.
- The developed empirical expression allows for accurate temperature determination, crucial for reliable NMR data.
- This work provides essential insights for optimizing experimental conditions in high-speed MAS NMR spectroscopy.
