Abstract
Microparticle physics is different from the physics of bulk matter. An impressive manifestation of this difference is the explosion of dust from materials that are quite harmless in the bulk state. Another conspicuous example is the blackness of colloidal gold. Microparticle physics is also distinguished from the physics of the surface of bulk media and the physics of thin films or whiskers. Far-infrared spectroscopy provides a striking example: bulk surfaces, thin films, and microparticles of alkali halides show quite different types of reflection or emission spectra. In bulk material, characteristic lengths such as the pertinent wavelengths, correlation lengths, and mean free paths are much smaller than the macroscopic geometrical dimensions of the sample; i.e., the sample boundary is not “seen” by the phenomenon in question. On the contrary, microparticles are solid samples whose geometrical dimensions are microscopic, i.e., of the order of, or even smaller than, the microscopic characteristic length characterizing the physical effect under consideration, and thus the boundary plays an important, if not dominant, role.
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Baltes, H.P., Šimànek, E. (1982). Physics of Microparticles. In: Marlow, W.H. (eds) Aerosol Microphysics II. Topics in Current Physics, vol 29. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81805-9_2
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