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Natural Science Forum / Physics / General Physics / July 2007Naughty magnet
Magnetite, mixed-valence ferrites in general, are supremely insoluble in any non-reactive solvent. Adding a jot of hydrazine to boiler steam semi-reduces iron oxides and plates out magnetite inside pipes. This passivates them against further corrosion. The idea of non-reactively dissolving and recrystallizing cm-sided magnetite cystals near room temperature is madness. However... Magnetite is nicely soluble in ambient temp 2:1 urea/choline chloride - a 178 degree freezing point depression from the weighted-average melting points of the components. It goes up, it comes out. Potentially cute high school science project with magnetite or barium ferrite. Heat it up to dissolve solute, slowly cool to get seed crystals. Then go for Big Casino. Do ya think a clean crystal of magnetite will be transparent (transparent colored, of course)? Could be a mammoth refractive index from polarized magnetic coupling. http://sciencekit.com/images/250/1737-40WebF.jpg Thiele-Dennis tube H. Hope, "Apparatus for growth of crystals for X-ray diffraction study" J. Appl. Cryst. 4 333 (1971) Here's the kicker: Is the magnetite solution magnetic? Paramagnetic? Makes for an interesting variable during crystallization. A tesla permanent field is easy to obtain, <http://www.gaussboys.com/ndfeb-magnets/75mm-circular-dipole-halbach-array.html> elegant http://www.unitednuclear.com/magnets.htm "Supermagnets" Mount two in apposition with tapered soft iron pole faces.  SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 [...] The unitednuclear magnet is mightily entertaining. But I'm still not sure why I put away 100 bucks on one of those... It also makes an excellent studfinder - it finds the drywall screws. Plus it also finds conduit and rebar. Or anything remotely ferromagnetic that I dropped on the floor. > [...] > [quoted text clipped - 4 lines] > Plus it also finds conduit and rebar. Or anything remotely > ferromagnetic that I dropped on the floor. I have one too! I put my wallet in another room and admire the thing. Then it goes back into the garage, hard against one wall, where it befuddles my next-door neighbor who has a compass on his car's dashboard. I was tempted to buy the tesla Halsbach array and grow a plant through its center, photosynthesis being rich with unpaired spins. Six benzil continuous solution crystallizers coming on-line instead. http://www.mazepath.com/uncleal/benzil8.jpg more than big enough but not nearly good enough Maybe it really is difficult to grow large flawless single crystal benzil from solution. I'll play Bach to them as motivation. SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 > I was tempted to buy the tesla Halsbach array and grow a plant through > its center, photosynthesis being rich with unpaired spins. You're killing me! Tell us more! :-)) > > I was tempted to buy the tesla Halsbach array and grow a plant through > > its center, photosynthesis being rich with unpaired spins. > > You're killing me! Tell us more! :-)) Look up C-13 enrichment from doing low conversion photochemistry in a magnetically stirred flask. 100 gauss is more than enough to select for spin pairing. A tesla is 10,000 gauss. Dipole strength falls off as 1/r^3. The Halsbach array goes from ~0.8 T at the inner edges to 1 T at the middle. Now you tell us about how each of field strength, field gradient, and field divergence effects the outcome of free radical combination. SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 > Look up C-13 enrichment from doing low conversion photochemistry in a > magnetically stirred flask. 100 gauss is more than enough to select > for spin pairing. How does this work? A field of 100 gauss splits the energy levels of an unpaired electron by the equivalent of about 15 millikelvin. How does this compete with kT ~ 300 K? --John Park > > Look up C-13 enrichment from doing low conversion photochemistry in a > > magnetically stirred flask. 100 gauss is more than enough to select [quoted text clipped - 5 lines] > > --John Park Interesting but I think they erroneously apply kinetic theory to the first issue and look out for comparison. > > Look up C-13 enrichment from doing low conversion photochemistry in a > > magnetically stirred flask. 100 gauss is more than enough to select [quoted text clipped - 3 lines] > unpaired electron by the equivalent of about 15 millikelvin. How does > this compete with kT ~ 300 K? Acc. Chem. Res. 13 369 (1980) US Pat. 4448657 Even 100 gauss (magnetic stirbar) observably alters radical recombination rate. k = Ae^[-hE/RT] Magnetic effects act on the A factor (not E) through the Wigner spin conservation rule (electron and nuclear spins are conserved during reaction). Magnetic coupling provides a symmetry breaking, opening or closing spin-dependent reaction channels (e.g., CIDNIP population inversions). C-13 (magnetic isotope) enrichment during photolysis of dibenzylketone to 1,2-diphenylethane is the classic demonstration. magnetic isotope turro 13,600 hits Growing "lilies in the field" is a modestly interesting experiment. SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 >> > Look up C-13 enrichment from doing low conversion photochemistry in a >> > magnetically stirred flask. 100 gauss is more than enough to select [quoted text clipped - 17 lines] > inversions). C-13 (magnetic isotope) enrichment during photolysis of > dibenzylketone to 1,2-diphenylethane is the classic demonstration. Interesting. Thanks. --John Park > >> > Look up C-13 enrichment from doing low conversion photochemistry in a > >> > magnetically stirred flask. 100 gauss is more than enough to select [quoted text clipped - 19 lines] > > > Interesting. Thanks. "8^>) Theory bows to falsifying observation. Observation leading to discovery is hot stuff. The two should be in balance. As with computers simulating test animals, theory can only tell you what you already know. Physical reality is more interesting than that. Look around. Original Sin was eating of the tree of knowledge. Sodom was destroyed for sins of the flesh and posted as a warning ever after. Gomorrah was destroyed for sins of the mind and ablated from history. What gods fear is our highest priority for discovery. Damascus steel was denied the Christian god. Take the hint. SignatureUncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/lajos.htm#a2 > > > I was tempted to buy the tesla Halsbach array and grow a plant through > > > its center, photosynthesis being rich with unpaired spins. [quoted text clipped - 6 lines] > as 1/r^3. The Halsbach array goes from ~0.8 T at the inner edges to 1 > T at the middle. While I start off with a rush of searching internet, I hit a few pay sites. But this one is free and on top of the list for "photosynthesis magnet": http://skeptoid.com/episodes/4007 (http://stinet.dtic.mil/oai/oai? &verb=getRecord&metadataPrefix=html&identifier=AD0606952) I don't like the tone of this article. The skeptics are way out of sobriety and sound just like a street gang of elderly women for the pope. I've seen with my own eyes that a "magnetic water filter" - rather large grid with many meters of pipes leaves some small dirt from the water at the locations of magnets. Also plants do react to anything - sun and water. And if you put a nail into wall any weed will grow towards it. Birds can be "stirred" with a small magnet mounted on their head - it seems biomolecules have magnetic properties. On the other hand, NMRI leaves so many patients - in perfect health without a residual spot. Although my friend says that after going into 3T field you'll look like tesla on the exit. Photosynthesis can be NMRed (nothing special) ... http://www.pnas.org/cgi/reprint/78/6/3305.pdf > Now you tell us about how each of field strength, field gradient, and > field divergence effects the outcome of free radical combination. Right. Cereals grows better! http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJJ-4MM7WS9-5&_user=1 0&_coverDate=04%2F30%2F2007&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000 050221&_version=1&_urlVersion=0&_userid=10&md5=f84b50750e288185009056d7eb450ea1 This unreadable article says that magnets do affect photosynthesis and free radicals... more in many other articles. http://www.pnas.org/cgi/reprint/79/15/4632.pdf And this article will get to the heart of masses: http://www.subtleenergies.com/ormus/tw/magnetite.htm All articles in one place: http://www.stanford.edu/group/boxer/publications_photo.html [BB] > I've seen with my own eyes that a "magnetic water filter" - rather > large grid with many meters of pipes leaves some small dirt from the > water at the locations of magnets. [hanson] The magnetic water treatment filter was promoted about 20 years ago with big fanfare. It was supposed to interfere with/disturb normal crystal growth of Ca/Mg carbonates and silicates such that they form grid instead of precipitating and plating out on the pipe walls. I dunno why the municipal water suppliers have not latched on to it if it was such a good thing. [BB] > Also plants do react to anything - sun and water. And if you put a > nail into wall any weed will grow towards it. [hanson] That may be a wishful conclusion. The weeds will growth there, nail or no nail, but if there is a nail or protrusion then the plant will use it as an anchor/support. Look how vines do grow. However, you may have a point in that plants to need Fe for growth and do seek out loci with higher concentrations of nutrients (Fe). Even bacteria do have this capability. [BB] > Birds can be "stirred" with a small magnet mounted on - their head it seems biomolecules have magnetic properties. [hanson] Many birds do have IN their head or other body parts tiny , small chains of magnetc Haematite crystals which they apparently use as compass for orientation on their migrations. All these items you mention here, BB, are fascinating physics problems, all worthwhile investigating, for big loot is attached to such applications.. beating the useless Einstein sh.t anytime. ... ahahaha... [BB] > On the other hand, NMRI leaves so many patients - in perfect health > without a residual spot. Although my friend says that after going into > 3T field you'll look like tesla on the exit. [hanson] AHAHAHA... ahahaha... besides the horrible noise and feeling of clostrophobia in that f.cking MRI tube, there have been no major side-effects reported except, of course, that your body becomes a temporary radio, which is the intent of the game in the first place. [BB] > Photosynthesis can be NMRed > (nothing special) ... http://www.pnas.org/cgi/reprint/78/6/3305.pdf [quoted text clipped - 17 lines] > All articles in one place: > http://www.stanford.edu/group/boxer/publications_photo.html <snip> > I was tempted to buy the tesla Halsbach array and grow a plant through > its center, photosynthesis being rich with unpaired spins. I wonder if you could confuse birds with it... Resonance effects indicate a radical-pair mechanism for avian magnetic compass p177 Thorsten Ritz, Peter Thalau, John B. Phillips, Roswitha Wiltschko and Wolfgang Wiltschko Nature 429, 177-180 (13 May 2004) | doi:10.1038/nature02534; Received 2 September 2003; Accepted 30 March 2004 SignatureAndrew Resnick, Ph.D. Department of Physiology and Biophysics Case Western Reserve University > <snip> > [quoted text clipped - 10 lines] > Nature 429, 177-180 (13 May 2004) | doi:10.1038/nature02534; Received 2 > September 2003; Accepted 30 March 2004 Magnetic birds see with eyes: http://www.biol.vt.edu/faculty/phillips/behavlab/compass.php |
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