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Observations during Reactions and Melting of Freely Suspended Solid Particles
Author(s) -
Straubel Harald,
Straubel Edith
Publication year - 1986
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19860030308
Subject(s) - melting point , crystal (programming language) , diffraction , precipitation , softening point , materials science , nucleus , polymer , softening , chemical physics , chemical engineering , chemistry , composite material , optics , physics , meteorology , computer science , biology , programming language , microbiology and biotechnology , engineering
Abstract With the three‐plate‐capacitor method, as described previously by the author, reactions and heating processes in freely suspended particles (diameter 5‐50 μm) were investigated by using the diffraction pattern of a laser beam. Change of weight can be registered, during operation, by the a. c. and d. c. voltage connected to a capacitor. This device enables information to be obtained, from inside the droplets, on the gradient of density or the precipitation of small particles and on the formation and solution process of a crystal nucleus in anorganic and low molecular organic substances. The behaviour of high polymer materials was studied during heating in the central region ca. 4 μm of the droplet. The diffraction patterns are similar to those of crystals (micells), but they do not show any crystal nucleus in the center. The application of heat, up to the softening point, gradually diffuses this cell arrangement. Such phenomena have not previously been studied within a droplet.