Fig. 1

Design drawing of the base for sample loading

Fig. 2

Design drawing of the clip

Fig. 3

Design drawing of the rod for sampling loading

Fig. 4

Design drawing of the thimble

Fig. 5

Self-made sample preparation tools, from left to right, the lab spoon, thimble, sample loading rod, sample loading base, clamp, positioning rod and the MAS rotor

Fig. 6

Drawing of the MAS rotor, 1. the top, 2. the rotor tube, 3. the bottom

Fig. 7

Schematic diagram of the airflow to the rotor during rotation

Fig. 8

The 27Al SSNMR spectrum of the self-made rotor performed on a JEOL JNM-ECZ600R NMR spectrometer. A 3.2 mm probe was used with a spinning rate of 12 kHz using 128 scans

Fig. 9

Speed driven airflow pressure data curves for 3.2 mm self-made rotor parts [(a) bottom, (b) top] and commercial rotor parts

Fig. 10

Speed propulsion data curve comparison between 3.2 mm complete set of self-made rotor and commercial rotor, (a) rotor without sample, (b) rotor filled up with sample

Fig. 11

3.2 mm MAS speed curve comparison between complete set of self-made rotor and commercial rotor

Fig. 12

Comparison of 13C CP MAS SSNMR test spectra of adamantane with a 3.2 mm complete set of self-made rotor and a commercial rotor performed on a JEOL JNM-ECZ600R NMR spectrometer. A 3.2 mm three-channel probe was used with a spinning rate of 12 kHz, the 90 degrees pulse width is 2.25 μs, contact time is 2 ms, the relaxation delay is 1 s, the scans is 3 600 times, the points is 2 048, and the scan time is 1 h