Not long ago I saw a demonstration of a simple organic solar cell (fruit juice on TiO) , it got me really thinking. I took some chemistry before switching to computer science, so I knew you needed molecules with lots of conjugate bonds, and spectra in the energy level above the band gap of the semiconductor electrode. So I thought, I'll just get some peryline green from the art store, mix it up with some aniline, maybe some anthraquinone then turn it into a conductive polymer and I might have something better. I was thinking like why hasn't anyone else thought if it... That's an example of the Dunning Kruger effect. Classic. The more I looked into how to do such a solar cell, the more I learned, the more I realized I still need to learn. I am so glad to have found your channel! Very helpful, clearly understandable and very educational thank you very much! Is there a specific video of yours that specificly covers the energy transfer directly into redox reactions? Any intermediate level reading recommendations for my self education? Ideally I would like to design a system for an organic flow battery where the electrolyte gets charged directly by light, therefore removing many conversion steps, charge controllers & other ancillary electronics.. hence greater reliability simplicity and lower cost (given chemical stability) Seeing now how much more is known and how much more research has been done then I initially thought, I still have to ask why hasn't this already been done? What problem hasn't been solved yet?
@renem.williams9257
8 ай бұрын
You could read this: dx.doi.org/10.13140/RG.2.2.16547.30244
@TrulyNaturalMom
7 ай бұрын
Thank you for this information of biochemistry’s use of photonic light. I use a device to introduce light & frequency to heal. This is a great explanation- because NO2 is the best way to heal inflammation and pain.
@renem.williams9257
6 ай бұрын
Sounds great!
@dmajumdar2059
2 жыл бұрын
i have been looking for a detailed video on FRET for a very long time! Great to finally have one!!
@ru1h
10 ай бұрын
Would it be right to say that the rate constant of dexter's mechanism inversely proportional to the exponent of the distance between the donor and acceptor while for forster's mechanism; the rate constant is inversely proportional to sixth power of the distance
@renem.williams9257
9 ай бұрын
Regarding the distance dependence of energy transfer: If we plot the natural logarithm of the rate vs distance, we get al linear curve for the Dexter mechanisms. The slope is negative and gives the beta value. doi.org/10.1021/ja990044b The abscissa gives the fastest rate at close contact. Similar observation have been made for photo-induced electron transfer. doi.org/10.1021/ja00245a014 If we do the same for the Forster mechanism, the curve is not straight, but is curved. www.wiley-vch.de/contents/jc_2111/2008/f800156_s.pdf The rate is proportional to 1/R^6 (see also at 27:00) Only changing the distance in molecular systems, keeping all other parameters the same, is often not that easy. SEE ALSO ADDITION IN TEXT BELOW VIDEO. (identical text). I would say that this agrees with your statement!!
@petevenuti7355
8 ай бұрын
Has FRET ever been experimentally evaluated in a medium with an index of refraction less than one? (FTL phase velocity)
@renem.williams9257
8 ай бұрын
FRET in Metamaterials is rather popular in research: doi.org/10.1038/s42005-023-01347-1 doi.org/10.1021/acsphotonics.8b00484 doi.org/10.1016/j.nanoen.2020.105226 Meta materials can have a negative refractive index.
@peter.a.tanner
2 жыл бұрын
I listened until 2:18 and it was enough. 1. An excited state is not an exciton (as written later accidents); 2. Dexter (not Dextrer) transfer is not double electron exchange. The orbitals are overlapping before the incident photon comes. 3. There are more than 2 theoretical frameworks for nonradiative energy transfer. 4. Forster and Dexter are not singlet and triplet energy transfer..
@peter.a.tanner
2 жыл бұрын
Unfortunately, this type of thinking pervades the chemical literature
@renem.williams9257
2 жыл бұрын
1: wikipedia: “When a molecule absorbs a quantum of energy that corresponds to a transition from one molecular orbital to another molecular orbital, the resulting electronic excited state is also properly described as an exciton.” OK, excitons are mainly used in solid state physics, but sometime we want to talk to them. There are many types of excitons. I prefer using the words “excited states”. There are also many types of excited states!! 2: Thanks for helping to improve the captioning provided by Google/KZitem. I now corrected these mistakes. Dexter is often described as double electron transfer. It is also called the exchange mechanism, electron exchange. Yes, orbital overlap plays an important role here. The orbitals mediate the interaction. The transfer is triggered by the photon, the interaction is already there. 3: As written below the video; “There are two important theoretical frameworks that can be used for energy transfer: the Coulomb based Förster Resonance Energy Transfer (FRET) and the Exchange based Dexter mechanism.” There are indeed more mechanism. Even TODAY MSc students presented about energy transfer between graphene and molecules that did not follow Förster. 4: Förster is often used for singlet-singlet energy transfer. Dexter for triplets. But there are examples where both play a role at the same time, competing with each other, as I tell later-on in the video.
@peter.a.tanner
2 жыл бұрын
@@renem.williams9257 Thanks for quoting Wikipedia to me. That is about it.
@peter.a.tanner
2 жыл бұрын
@@renem.williams9257 Anyway, it's good to put science on KZitem. Keep it up
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