the photomolecular effect - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: June 09, 2024, 02:20:23 am
content: https://news.mit.edu/2024/how-light-can-vaporize-water-without-heat-0423it makes me think there might be more to photons then we learned to think.i wonder if it brings any legitimacy back into microwave chemistry (that is, non thermal).and drying laundry in the sun. and evidence against reheating pizza in the microwaveI think personally I noticed that red light makes cuts heal faster... but its nice to see MIT get some concrete proof behind interesting photon-fluid interactions

author: Njk
author_rank: Frequent Contributor
timestamp: June 11, 2024, 01:16:42 pm
content: Quote from: coppercone2 on June 09, 2024, 02:20:23 amJust wonderful (if true)QuoteThere are many reports about increased acrylamide formation in food during microwave cooking, under certain conditions, especially with potato. A nice summary:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570677/QuoteUV light heals cuts even better. The effect is known for long time, but it's difficult to sell, unlike pills.

author: coppercone2
author_rank: Super Contributor
timestamp: June 24, 2024, 05:48:12 pm
content: its rather unpleasant to tend to a wound. You do have to spend a few minutes with a light instead of just washing it and changing a bandage. Red light penetrates so for something like a finger cut, you can go through the back of your hand to presumably get some light on it. the other light requires application to top of wound for sure. I think tis worth healing faster but its pretty disgustingits just one of those things people are too lazy to do, i.e. ointment, frequent washing and frequent bandage changes. Add light on top and its getting to technician level. Most people leave on a stinky bandage until it falls off days later for small stuff

author: jpanhalt
author_rank: Super Contributor
timestamp: June 24, 2024, 06:12:02 pm
content: It's been around for a ling time. Look up MALDI (matrix assisted laser desorption/ionization). That was not the first demonstration. "Photomolecular" effects were described in the 19th century.

author: coppercone2
author_rank: Super Contributor
timestamp: June 24, 2024, 06:16:18 pm
content: it was not thought to happen for something as a simple body of water, they thought it was only happening in certain bizarre structures from what I understand

author: jpanhalt
author_rank: Super Contributor
timestamp: June 24, 2024, 08:20:42 pm
content: You know, it might help if you defined new words. What in the world do you consider a "bizarre" chemical structure?.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 24, 2024, 08:34:53 pm
content: I assume something like: incident, refracted or even evanescent waves acting upon molecules at the boundary, in a way that isn't simply thermal excitation.What's neat, exciting even, is it could be a refrigerating effect: the evaporated molecules could be sorted by temperature, the higher-energy ones being thrown off while cooler stay behind; this is perfectly justifiable for any strength of effect up to the Carnot limit, i.e. the incident energy acts as power input and the liquid and gas phases are the thermal reservoirs.Though it sounds like from their temperature measurements, it might be the opposite effect if anything. Or maybe it depends on wavelength, or orientation, or liquid characteristics.But anything mechanistic they'll have to do a lot of research to figure out. The announcement doesn't seem to be very interesting, more of a heads-up really, but the underlying mechanics could prove fascinating.Quote from: coppercone2 on June 24, 2024, 06:16:18 pmQuote from: jpanhalt on June 24, 2024, 08:20:42 pmFor that matter, what most scientists consider "bizarre"iswater's chemical structure (well, that exactly not so much, but the resulting thermodynamic properties--). So, now I really don't know what they're trying to say here.Tim

author: Nominal Animal
author_rank: Super Contributor
timestamp: June 24, 2024, 08:40:37 pm
content: Water molecules are frigging bizarre, if you ask me. Horribly difficult to simulate correctly. Yeah, ab initio simulations can get the properties of a couple of water molecules, but try to simulate anything in water, or even a droplet of water, and you're in a world of hurt.If you want to scare a computational materials physicist, you tell them you want to simulate a protein in aqueous solution near a large metal crystal. Enjoy the deer-in-the-headlights stare.