Steve Kregel
@stevenjkregel.bsky.social
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Assistant Professor at Bradley University | Mass Spectrometry for Catalysis and the Environment.
This is what’s known as a “curl up with the dog and a good book” kind of day.
11 days ago
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We built some open source photo reactors and implemented them into the organic teaching lab here at Bradley. This was a fun project led mainly by the undergraduate students! Check it out:
pubs.acs.org/doi/10.1021/...
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Open-Source Photochemistry in the Organic Chemistry Teaching Laboratory
We report the development of an undergraduate organic chemistry laboratory exercise that utilizes a set of low-cost, open-source photoreactors to introduce students to photochemical principles. A seri...
https://pubs.acs.org/doi/10.1021/acsomega.5c06916
3 months ago
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If you’re at
#ASMS2025
come stop by my poster (ThP304) to learn about how we hacked an RGA to measure trace atmospheric species using low cost RF oscillator circuits!
7 months ago
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A bit late this year, but I’m on my way to
#ASMS2025
. Come see my poster on Thursday (TP304) to learn about hacking a commercial RGA into an atmospheric mass spectrometer!
7 months ago
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reposted by
Steve Kregel
Randall Munroe
8 months ago
PhD Timeline
xkcd.com/3081
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Great job tonight Wisconsin. Sorry I couldn’t be there to help, but glad to see things moving in the right direction.
9 months ago
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reposted by
Steve Kregel
David K Smith
11 months ago
The ACS has deleted its website on Diversity, Equity, Inclusion & Respect. And with that move, have shown they are worthy of none of the latter. People ask why no-one stands up to fascists, this is why - they are too worried about their own standing to challenge it.
www.acs.org/about/divers...
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https://www.acs.org/about/diversity.html
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I feel validated as an instrument builder when this shows up unannounced
11 months ago
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reposted by
Steve Kregel
Tori Barber
11 months ago
**screams in early career scientist**
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Ever wanted to apply RF voltages to an ion guide or funnel without all that messy resonance matching and co-axial cables? Check out my groups first publication, in which we modify the open-source Wisconsin Oscillator to mount directly to the vacuum flange
#teammassspec
pubs.acs.org/doi/10.1021/...
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A Hybrid Vacuum Flange RF Oscillator for Low-Cost Mass Spectrometry
In this communication we report the construction of a printed circuit board which mounts directly to the vacuum chamber of a mass spectrometer and produces the RF waveforms needed by many nonmass-selective devices such as ion guides and ion funnels. Our device is designed to replace a standard KF40 flange, can maintain vacuum chamber pressures of less than 10–6 Torr, and contains the circuitry of the open-source Wisconsin Oscillator RF power supply to generate RF waveforms of 1–4 MHz and up to 200 Vp-p. In this iteration of the Wisconsin Oscillator, we also introduce a variable resistor to control the output RF amplitude and show that its ion transmission capabilities are identical to those provided by commercial RF power supplies. With this new implementation we have greatly reduced the space and monetary requirements for driving nonmass-selective ion manipulation devices, which we expect to be advantageous to those developing low-cost and/or portable mass spectrometry systems.
https://pubs.acs.org/doi/10.1021/jasms.4c00410
11 months ago
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Unpleasant surprise after thanksgiving. Motor bearing on the mass spec vacuum blew out over break 😢
about 1 year ago
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Hello
#chemsky
! I'm an Assistant Professor at Bradley University and I teach Analytical Chemistry and Instrumental Analysis. I also work on building miniature (and open source) mass spectrometry hardware. Keep your eyes peeled for a full open source MS in the next year or so!
about 1 year ago
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