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He can re-run the DSC under an argon atmosphere. What a simple and elegant solution.
The first thing we notice is the wide disparity of values for the “highly engineered” material. This should raise doubts as to sample collection and preparation and even if the materials are the same thing. By other analyses, they appear similar.
it is simply the reduction of a metal oxide, in this case iron oxide, with elemental aluminum.
Originally posted by turbofan
reply to post by pteridine
Is this your complete submission?
I notice you didn't show your work for specific energy release of the elements found which is what your entire
argument is based upon.
IE: You must show that combustion of certain elements created a significant amount of heat above and
beyond such mixtures as basic conventional thermite, etc.
Do you plan to include any sort of support, links, science for your claims, or shall we work with your initial
post?
Let me know and I'll begin the reply.edit on 4-12-2010 by turbofan because: (no reason given)
Originally posted by NIcon
The first thing I noticed was a not careful reading of the paper:
"Proceeding from the smallest to largest peaks, the yields are estimated to be approximately 1.5, 3, 6 and 7.5 kJ/g respectively. Variations in peak height as well as yield estimates are not surprising, since the mass used to determine the scale of the signal,shown in the DSC traces, included the mass of the gray layer. The gray layer was found to consist mostly of iron oxide so that it probably does not contribute to the exotherm,and yet this layer varies greatly in mass from chip to chip."
Jones does not state if he used pans with lids or open pans [a peer review would have noted this and had him be specific].
The temperature shown on the x-axis is the furnace temperature, not the sample temperature, so there is no way of directly measuring flame temperature.
Originally posted by turbofan
Is this your complete submission?
I notice you didn't show your work for specific energy release of the elements found which is what your entire
argument is based upon.
Originally posted by pteridine Heat flow is what is measured. The x-axis is the temperature of the platen/furnace that is being ramped up at 10C/minute while the y axis shows the heat flow in or out of the sample. The instrument can display the heat flow as watts. If the weight of the sample is known, it can be displayed as watts per unit mass. When calibrated, integration under a peak will provide total energy flux for that event. This is what Harrit did. I have no argument that the instrument measured the integrated energy flux for the fraction that actually reacted.
The exotherm came from chemical reaction, some or all of which was combustion, given the energetics. Because the experiment was run in air, we cannot discriminate between combustion and other reactions.
Originally posted by turbofan
reply to post by -PLB-
And when you and Pteridine learn the temperatures required to produce spheres which contain elemental
Iron from Iron Oxide you will understand that combustion is just a small portion of the total heat.
Do yourself a favour and study the Tillotson LLNL data before making such ignorant claims. Tillotson used
the presence of oxygen in his experiment, and Jones did the same do duplicate the environment.
That is how science works. You don't alter a known procedure and expect to compare similar data.edit on 5-12-2010 by turbofan because: (no reason given)
Originally posted by -PLB-So where does the rest of the heat come from? We can tell for certain that in one experiment about half did not come from a thermite or explosive reaction.
It seems to me the significant difference between those experiments is that in the one by Tillotson the exact composition of the materials was known. So it was known no combustion could take place, and an inert environment would not make a difference. In case of the experiment by Harrit, the substance was unknown, so no prediction about what reaction would take place could be made.
Originally posted by turbofan
Show your source and quote the data please.
THis makes absolutely no scientific sense at all. Please link the Tillotson document you are referring to.
Note the composition of the material you are describing and then try to apply your theory about combustion.
We synthesized a prototype nanocomposite by crystallizing ammonium perchlorate (AP) within the pores of an organic gel in FY1998. In this composite, the AP acts as an oxidizer with the hydrocarbon gel skeleton serving as the fuel.
Originally posted by turbofan
reply to post by pteridine
Pteridine, please stay focussed. You have failed to answer the question twice. Here it is again:
Do you agree that heat can be transferred back into the test platen during a reaction of the material.
Yes, or no?