Ultra Low Temperature Microturbine for Magic Angle Spinning System

Herzog, Nicoleta; Weber, Alexander Séverin; Purea, Armin; Osen, David; Knott, Benno; Engelke, Frank; Wilhelm, D.

doi:10.1115/1.4053746

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Among these choices, ZrO2 and Vespel are popular materials for the drive cap because ZrO2 has superior mechanical strength and a low thermal expansion coefficient, which is preferred for lowtemperature dynamic nuclear polarization (DNP) experiments. [6][7][8] However, machining ZrO2 is challenging and, hence, expensive, i.e. a 3.2mm ZrO2 cap costs ~1k USD (CortecNet).…”

Section: Introductionmentioning

confidence: 99%

In-House Fabrication of 1.3 to 7 mm MAS Drive Caps using Desktop 3D Printers

Amerein

Banerjee

Pang

et al. 2023

Preprint

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The 3D-printing technology has emerged into a well-developed method to fabricate parts with considerably low cost and yet with high precision (< 100 um). It was shown in the recent literature that the 3D-printing technology can be exploited to fabricate magic-angle spinning (MAS) system in solid-state nuclear magnetic resonance (NMR) spectroscopy. In particular, the 3.2 mm MAS drive caps with intricate features are well fabricated using an outsourced 3D printing service, and the caps were demonstrated to spin > 20 kHz. Here, we show that not only lab-affordable benchtop 3D printers can produce equal-quality drive caps as the commercialized version, but also smaller 2.5 mm and 1.3 mm MAS drive caps—despite slight compromise in performances. All in-house fabricated drive caps (1.3 to 7 mm) can be consistently reproduced (> 90 %) and achieved excellent spinning performances. In summary, the > 3.2 mm systems have similar performances as the commercial systems, while the 2.5 and 1.3 mm spun up to 26 kHz  2 Hz, and 46 kHz  1 Hz, respectively. The low-cost and fast in-house fabrication of MAS drive caps allows easy prototyping of new MAS drive cap models and, possibly, new NMR applications. For instance, we have fabricated a 4 mm drive cap with a hollow center to allow better light penetration or sample insertion during MAS.

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Section: Introductionmentioning

confidence: 99%

In-House Fabrication of 1.3 to 7 mm MAS Drive Caps using Desktop 3D Printers

Amerein

Banerjee

Pang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Among these choices, ZrO2 and Vespel are more popular relative to other ceramics or hard plastics because ZrO2 has excellent mechanical strength and matches the rotor materials, [4,5] i.e., the same thermal expansion coefficient between the two components is ideal for variable-temperature or dynamic nuclear polarization (DNP) experiments. [6] However, machining hard ZrO2 is very challenging and, hence, expensive (~1k USD for 3.2 mm). Although the Vespel drive cap is much more affordable (~130 USD for 3.2 mm), it is still a non-negligible expense because the delicate fins on the drive cap wear out easily if not handled carefully or after repeated fitting/removal from the rotor.…”

Section: Introductionmentioning

confidence: 99%

In-House Fabrication of 1.3 to 7 mm MAS Drive Caps using Desktop 3D Printers

Amerein

Banerjee

Pang

et al. 2022

Preprint

View full text Add to dashboard Cite

The 3D-printing technology has emerged into a well-developed method to fabricate parts with considerably low cost and yet with high precision (< 100 m). It was shown in the recent literature that the 3D-printing technology can be exploited to fabricate magic-angle spinning (MAS) system in solid-state nuclear magnetic resonance (NMR) spectroscopy. In particular, the 3.2 mm MAS drive caps with intricate features are well fabricated using an outsourced 3D printing service, and the caps were demonstrated to spin > 20 kHz. Here, we show that not only lab-affordable benchtop 3D printers can produce equal-quality drive caps as the commercialized version, but also smaller 2.5 mm and 1.3 mm MAS drive caps—despite slight compromise in performances. All in-house fabricated drive caps (1.3 to 7 mm) can be consistently reproduced (> 90 %) and achieved excellent spinning performances. In summary, the > 3.2 mm systems have similar performances as the commercial systems, while the 2.5 and 1.3 mm spun up to 26 kHz  2 Hz, and 46 kHz  1 Hz, respectively. The low-cost and fast in-house fabrication of MAS drive caps allows easy prototyping of new MAS drive cap models and, possibly, new NMR applications. For instance, we have fabricated a 4 mm drive cap with a hollow center to allow better light penetration or sample insertion during MAS.

show abstract