Microscopy: Tear-off test
If you spread a paste with a spatula on a smooth surface (glass slide) and then pull it off thinly until the layer tears off, you can already conclude two things. You can see how well the paste adheres to a smooth surface such as a GPU die and you can see how it tears off at the resulting edges. In the case of the gel, however, only a coarse-grained soup can be seen, which is already a bad sign.
However, you can already see from the edges that the paste is really melting due to its consistency and you should at least pay close attention to a homogeneous surface without holes when applying it. Something like this definitely has no place on the GPU and CPU.
Microscopy: Particle sizes
This is where I reach the limits of the resolution of the Keyence VHX-7100, because in the sub-micron range and with nanoparticles I can see that there is still something there, but even at 2000x resolution it is no longer possible to identify or even measure such small particles cleanly. I even go back to 1500x magnification to rule out possible image errors (shadows etc.), which the image stabilization may then sell to me as grain. However, the somewhat coarser grinding degrees of some particles can be easily analyzed and determined. In the paste, the particles disappear in the viscous matrix soup and look almost like fish eggs.
Material analysis
I also need to say something up front to help you better understand the quantitative weights determined, as I normally use LIBS to determine the quantitative weights of individual chemical elements and not compounds. The aluminum found is a component of the contained Al2O3and thus binds the listed oxygen together with the polymer of the matrix (silicon). I was unable to measure any hydrogen here, but that does not mean that there was none. The quantity is either too small, or it evaporated in the plasma because I had to process the silicone soup with maximum laser power in order to get to the sunken metal treasures at all. Zinc, however, is completely missing.
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