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Fluctuation, relaxation and “super‐structure” in liquids the conformon model
Author(s) -
Kilian HannsGeorg
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971130110
Subject(s) - superstructure , superposition principle , thermodynamics , configuration entropy , planck's law , hard spheres , statistical physics , relaxation (psychology) , materials science , molecule , condensed matter physics , physics , quantum mechanics , psychology , social psychology
The conformon model of liquids postulates a heterogeneous dynamic superstructure in liquids. The model predicts a universal reduced energy‐ and entropy‐density distribution (Planck distribution) which typify together the thermodynamics of fluctuations. The mean reduced energy‐ and entropy density distributions are identical and invariant at all temperatures, independently of the type of molecules the liquid is comprised of. The model predicts therefore a unique superstructure at the quasi‐static glass‐transition temperature. Tapping‐mode atomic force experiments on monolayers of bottle‐brush molecules reveal a type of a superstructure which is, in fact, in good accord with the conformon model. Relaxation experiments can be described as superposition of a broad set of intra‐conformon Debye‐processes which is consequently related to the heterogeneous equilibrium structure. Principal aspects of the results are reflected in the paper.