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| Tags: chirality, question |
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#11
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Thank you for this comment.
Beyond your direct observation correlating racemates and entropy, I am interested in the polarization. In addition, you made a comment to another post that's been at the center of my struggle to reconcile emperical obervations with the necessary languages of physics - the math & an understanding of the context and association to understood/ accepted theory. "The model appears to be extremely empirical. Where are the error bars in such a mathematical mess." "?" I've been trying to get to a point where my emperical description can at least acknowledge where the messes are. Just the few exchanges on this list + looking at how other list questions are treated is helping me. I'll try to make a clear emperical case in a day or 2. My thanks to all. |
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#12
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"Richard D. Saam" ) writes:
Igor Khavkine wrote: On Feb 4, 7:29 pm, gdaebfc wrote: A quick caveat: While I'm clear on my personal understanding of the picture I want to paint, I'm working with a palette of concepts and formulas that are, for me, extremely difficult to use. So, I apologize in advance for being unclear and putting you in a position of deciphering my intentions when, in fairness, I should only be asking you to look at my thoughts. I'm sorry that you see a difficulty there. But at the same time I fail to see why you should be faced with this difficulty. Simple and direct worked for Newton: "I saw an apple fall from rest at height ...m; it hit the ground after ...s." I see no reason why this case should be any different. If it is not clear which empirical phenomenon this conversation is about, we might as well be talking about the number of angels on the head of a pin. And I don't find that a useful conversation to have. [...] You have targeted the main point to this particular query. Chirality is understood to be a property in matter. In my process of investigating a bigger picture, I've identified a question to research: Where does chirality originate? Chirality, in the sense that the configuration of pixels in the letter L is chiral, is not a conserved quantity. It can be created or destroyed. Take a wire and bend it into a helix. Bam! You've just created some chirality; straighten it back out, and you've just destroyed some. Similar processes happen in nature all the time, without human intervention. This is not particularly deep or difficult. Hope this helps. Igor There may be a measurable aspect of chirality in terms of Entropy of mixing http://en.wikipedia.org/wiki/Entropy_of_mixing Walter J. Moore, Physical Chemistry, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1962. Racemate crystal is almost always lower in energy than that of a resolved enantiomer perhaps because of entropy of mixing. entropy = - R summation(i) X(i) ln(X(i)) Component 1 Component 2 X(1)ln(X(1)) + X(2)ln(X(2)) 1.00 0.0 0.0 0.90 0.1 0.325082973 0.80 0.2 0.500402424 0.70 0.3 0.610864302 0.60 0.4 0.673011667 0.50 0.5 0.693147181 maximum entropy 0.40 0.6 0.673011667 0.30 0.7 0.610864302 0.20 0.8 0.500402424 0.10 0.9 0.325082973 0.00 1.0 0.0 Do the math: entropy/c2 yields mass units at about a few parts in 10^13 At what temperature (since dimensionally [S] =[E]/[T] )? Maybe all you need to do is run the temperature down to a few picokelvin. --John Park That ought to create enough noise in the experiment to keep people guessing/discussing Eotvos Parity EP for years. |
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