Stable magic angle spinning with Low-Cost 3D-Printed parts

Ke Xu; Oliver Pecher; Marco Braun; Jörn Schmedt Auf der Günne

doi:10.1016/j.jmr.2021.107096

Stable magic angle spinning with Low-Cost 3D-Printed parts

J Magn Reson. 2021 Dec:333:107096. doi: 10.1016/j.jmr.2021.107096. Epub 2021 Oct 25.

Authors

Ke Xu¹, Oliver Pecher², Marco Braun², Jörn Schmedt Auf der Günne³

Affiliations

¹ University of Siegen, Faculty IV: School of Science and Technology Department, Inorganic Materials Chemistry, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
² NMR Service GmbH, Blumenstr. 70 Haus 3, 99092 Erfurt, Germany.
³ University of Siegen, Faculty IV: School of Science and Technology Department, Inorganic Materials Chemistry, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany. Electronic address: gunnej@chemie.uni-siegen.de.

PMID: 34768216
DOI: 10.1016/j.jmr.2021.107096

Abstract

A 3D-printed double-bearing magic angle spinning (MAS) system was developed with a home-built 4.0 mm MAS nuclear magnetic resonance (NMR) probe at 7 T. Various fused deposition modelling 3D printers were used to produce spinning modules of ignorable materials costs for rotors with a diameter of 7.0, 4.0, and 3.5 mm. High-performance MAS experiments on the 4.0 mm-diameter model using a pencil-type ceramic rotor and 3D-printed drive cap resulted in a high-resolution ¹H NMR signal of silicone grease. The 3.5 mm-diameter MAS system reached a spinning frequency of 23 kHz. Furthermore, 3D-printed inserts were designed for various rotor sizes which can isolate the sample from humidity for a duration of more than a week. Single crystal inserts for MAS rotors of commercial probes can readily be printed using two-color printers. Those developments enable customized low-cost MAS NMR for both adapting existing and manufacturing new probes, respectively.

Keywords: 3D printing; MAS; NMR.

Publication types

Research Support, Non-U.S. Gov't