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Disinfection with Far-UV (222 nm Ultraviolet light) (2020) [pdf]

133 点作者 deegles超过 2 年前

21 条评论

modestmc超过 2 年前
Nice to see this on HN, this is a big deal. I did research in 2021 to generate Far-UVC using nonlinear plasmonics.<p>The holy grail for this technology is a Far-UVC Diode. The guy who won the Nobel Prize for the blue LED (IIRC) is working with other physicists at UCSB to try and create said diode: <a href="https:&#x2F;&#x2F;www.news.ucsb.edu&#x2F;2020&#x2F;019949&#x2F;uv-lights-way" rel="nofollow">https:&#x2F;&#x2F;www.news.ucsb.edu&#x2F;2020&#x2F;019949&#x2F;uv-lights-way</a><p>If you want to learn more about Far-UVC itself (safety, etc), David Brenner is the real MVP: <a href="http:&#x2F;&#x2F;www.columbia.edu&#x2F;~djb3&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.columbia.edu&#x2F;~djb3&#x2F;</a>
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blairanderson超过 2 年前
I recently visited a national trade show for HVACR folks and found this company:<p><a href="https:&#x2F;&#x2F;www.amazon.com&#x2F;Blue-Tube-UV-Light&#x2F;dp&#x2F;B00D48XDO0&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.amazon.com&#x2F;Blue-Tube-UV-Light&#x2F;dp&#x2F;B00D48XDO0&#x2F;</a><p>Thought it might be applicable to computers, but realized that UV breaks-down PLASTICS as well, which is why you mostly find in ducting.<p>Very cool stuff if you&#x27;re into clean&#x2F;sterile living.<p>Note: Most of the dust in your home is comprised of human skin. Unless you&#x27;ve had an industrial vacuuming, other people&#x27;s skin is moving around your house or gumming up the walls of your ducts. UV lights (and chemicals) are the only way to break that shit down.
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purpleblue超过 2 年前
At the beginning of the pandemic, I read about UVC light and purchased a UVC light bulb before they ran out online. I used it to sterilize my N95 masks which were impossible to find, and all the research I did showed that you could do this 20+ times without affecting air flow or filtration of the mask. I even found studies that talked about how to use it to disinfect flu virus so I used those as a guideline as to how long I should expose the masks. I even went so far as to buy ajar and tested that the UVC light at least killed bacteria as advertised. I know viruses are much tinier and there&#x27;s no way to test for the virus but at least I knew it was working as advertised for bacteria.<p>Of course all this ended up being useless, but it was a fun project during the pandemic.
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maximilianburke超过 2 年前
One of the most driven* and intelligent people I have ever had the opportunity to work with (Saimir Sulaj) left my company to found a startup that&#x27;s building far UV disinfection devices:<p><a href="https:&#x2F;&#x2F;www.uvxinc.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.uvxinc.com&#x2F;</a><p>*I mean, it requires a certain kind of stubborn determination to do a hardware startup, and I hope he&#x27;s crushing it.
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donsupreme超过 2 年前
I am curious if the ambience air can be too &quot;sterile&quot;, that we will come to find out there are some good microbes in the air that is beneficial to our health.
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jefftk超过 2 年前
Dereck Lowe (&quot;In the Pipeline&quot;) has a good article on germicidal 222-nm: <a href="https:&#x2F;&#x2F;www.science.org&#x2F;content&#x2F;blog-post&#x2F;two-twenty-two" rel="nofollow">https:&#x2F;&#x2F;www.science.org&#x2F;content&#x2F;blog-post&#x2F;two-twenty-two</a>
EGreg超过 2 年前
Hi everyone. I had this idea two years ago, and made an entire website and video about it: <a href="https:&#x2F;&#x2F;uvspinner.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;uvspinner.com&#x2F;</a><p>Tried to get the NYC mayor&#x27;s office interested, but they just pawned me off to a black hole of submitting forms that no one reads.<p>If anyone still wants to do it, shoot me an email, username is greg with the domain &quot;qbix.com&quot; or add me on Facebook
joezydeco超过 2 年前
UV will break down a lot of plastics, especially if stabilizers are not added. I&#x27;m curious why the study didn&#x27;t mention this at all. How long can that bathroom hold out?
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bilsbie超过 2 年前
Remember when we needed germs to exercise our immune systems? Remember immune systems?
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RenThraysk超过 2 年前
It&#x27;s a shame we haven&#x27;t figured out to make efficient Far-UV leds. The performance drops off a cliff once start to get below 265nm (IIRC)
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jbm超过 2 年前
The Canadian government has a page that includes some information about the effects of Far-UV light against Covid-19.<p><a href="https:&#x2F;&#x2F;www.canada.ca&#x2F;en&#x2F;public-health&#x2F;services&#x2F;diseases&#x2F;2019-novel-coronavirus-infection&#x2F;canadas-reponse&#x2F;summaries-recent-evidence&#x2F;ultraviolet-germicidal-irradiation-technologies-use-against-sars-cov-2.html#t1" rel="nofollow">https:&#x2F;&#x2F;www.canada.ca&#x2F;en&#x2F;public-health&#x2F;services&#x2F;diseases&#x2F;201...</a><p>&gt; A whole room UV simulation demonstrated a far UV-C lamp (207-222 nm) could further reduce SARS-CoV-2 by 50-85% compared to ventilation alone and with both far UV-C and high ventilation the SARS-CoV-2 viral count was reduced by 90% in 6 minutes and 99% in 11.5 minutes Footnote 5.<p>I wonder if this is something that I could add to my pre-existing home ventilation system; no concerns at all about skin exposure (which doesn&#x27;t seem to be an actual issue based on this Boeing paper), and it shouldn&#x27;t be so hard.<p>* I found this (<a href="https:&#x2F;&#x2F;faruv.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;faruv.com&#x2F;</a>) but I don&#x27;t know how reliable they are.<p>That said, if this really was that effective, I don&#x27;t understand how viruses and bacteria are able to survive outside with our fusion-powered UV ray generator in the sky.<p>-edit- * I feel dumb, here it is at the end of the summary. Looks like Boeing is working w&#x2F; faruv.<p>&gt; Boeing recently entered into patent and technology licenses with Healthe® Inc. and FarUV Technologies. Under these licenses, both companies will produce and distribute a commercial Far-UV 222 nm mobile wand, helping airlines and potentially others reduce the impact of the coronavirus pandemic.
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londons_explore超过 2 年前
We need more studies, or maybe metastudies, that compare the germicidal benefits of UV lamps with the health disadvantages (skin cancer, ozone).<p>It seems that there is consensus on both effects, but I can&#x27;t find anything conclusive that allows the scale of the effects to be measured sufficiently to do a benefit&#x2F;cost analysis for each type of light spectrum and usecase.
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apienx超过 2 年前
This group&#x27;s notorious for shining UV at fashionable pathogens. <a href="https:&#x2F;&#x2F;www.nature.com&#x2F;articles&#x2F;s41598-020-67211-2" rel="nofollow">https:&#x2F;&#x2F;www.nature.com&#x2F;articles&#x2F;s41598-020-67211-2</a>
refurb超过 2 年前
<a href="https:&#x2F;&#x2F;www.biorxiv.org&#x2F;content&#x2F;10.1101&#x2F;2022.02.22.481471v1.full" rel="nofollow">https:&#x2F;&#x2F;www.biorxiv.org&#x2F;content&#x2F;10.1101&#x2F;2022.02.22.481471v1....</a><p><i>However, cells exposed to 222-nm far UVC presented the highest degree of DNA damage as evidenced by yH2AX staining. Globally, these cells presented transcriptional changes in cell cycle and senescence pathways. Thus, the introduction of 222-nm far UVC lamps for disinfection purposes should be carefully considered and designed with the inherent dangers involved.</i>
Maursault超过 2 年前
&gt; recently published studies have demonstrated that UV light at 222nm has the same germicidal capabilities of 254nm light without damaging skin or eyes.<p>222nm may have the same <i>capabilities,</i> but not the same efficacy and efficiency as 254nm (or 185nm, the germicidal action if which is it creates ozone, which does the disinefecting). Still, if it works but just takes longer without the sunburn and blindness, whether by proximity to 254nm such that some 254nm is still present, and&#x2F;or by proximity to 185nm such that ozone is still created, well, ok.
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scotty79超过 2 年前
I think it&#x27;s already used in some places: <a href="https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;ZeroCovidCommunity&#x2F;comments&#x2F;10kbkhz&#x2F;are_the_far_uvc_units_at_davos_commercially&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.reddit.com&#x2F;r&#x2F;ZeroCovidCommunity&#x2F;comments&#x2F;10kbkhz...</a>
ajmurmann超过 2 年前
I learned about this not long after it came out. That this didn&#x27;t see a big push my the government during the pandemic and that practically nothing has been spent on ventilation to me are some of the most confidence shaking aspects of how the pandemic was handled
nikolay超过 2 年前
I&#x27;ve been researching this and it&#x27;s too bad that only a few companies produce these, and the pricing is outrageous! I understand they want to make sure only 222nm UVC is produced, but still, come on!
Plough_Jogger超过 2 年前
The team at R-Zero Systems has a Far-UV product on the market: <a href="https:&#x2F;&#x2F;rzero.com&#x2F;vive&#x2F;" rel="nofollow">https:&#x2F;&#x2F;rzero.com&#x2F;vive&#x2F;</a>
beambot超过 2 年前
As a safety &amp; security robotics company, we looked at UVC applications early during the pandemic. We came to the same conclusions as Avidbots, which they published online:<p><a href="https:&#x2F;&#x2F;avidbots.com&#x2F;resources&#x2F;what-you-need-to-know-about-uvc-lights-and-autonomous-floor-scrubbing-robots&#x2F;" rel="nofollow">https:&#x2F;&#x2F;avidbots.com&#x2F;resources&#x2F;what-you-need-to-know-about-u...</a><p>TLDR: The level of light insolation you need for disinfection makes them less useful for large area coverage and&#x2F;or areas exposed to the public due to eye safety concerns.
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lstodd超过 2 年前
Disinfection is harmful unless absolutely needed.<p>Same as overuse of antibiotics - it only breeds more resistant strains and harms the immune systems because of lack of less resistant strains.
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