Download e-book for kindle: Disorder Effects on Relaxational Processes: Glasses, by Ranko Richert, Alexander Blumen

By Ranko Richert, Alexander Blumen

ISBN-10: 364278576X

ISBN-13: 9783642785764

ISBN-10: 3642785786

ISBN-13: 9783642785788

The box of non-crystalline fabrics has visible the emergence of many challeng­ ing difficulties in the course of its lengthy heritage. lately, the curiosity in polymeric and organic disordered topic has influenced new actions which in flip have enlarged the natural and inorganic glass neighborhood. the present study fields and up to date development have prolonged our wisdom of the wealthy phenomenol­ ogy of glassy platforms, the place the position of illness is key for the underlying microscopic dynamics. furthermore, regardless of the inability of a unified idea, many attention-grabbing theoretical versions have lately advanced. the current quantity deals the reader a set of themes representing the present kingdom within the knowing of ailment results in addition to a survey of the fundamental difficulties and phenomena concerned. the duty of compiling a publication dedicated to disordered structures has benefited a lot from a seminar prepared via the W.-E. Heraeus beginning in undesirable Honnef in April 1992, the place we had the chance to debate the undertaking with lots of the authors. the following we want to thank the Heraeus beginning for his or her help, and the authors and Springer-Verlag, particularly Dr. Marion Hertel, for the friendly cooperation.

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Additional resources for Disorder Effects on Relaxational Processes: Glasses, Polymers, Proteins

Sample text

We point out that the relaxation is monitored by impurity probes in solvation experiments [80], by some of the spectrophotometric methods discussed in Sect. 3, but also in dielectric relaxation studies of polar solutes in non-polar glass-forming hosts. In the latter case the stretching can strongly depend on what substance is used as a probe [81] as well as on its concentration in the host [21]. From Fig. 6, it is obvious that it is advisable to pay special attention to two further types of results because they do not conform to the general trend: These exceptional cases are those of the orientationally disordered (mixed) crystals (marked in the figure with x) and for the simple (aliphatic monohydric) alcohols as measured by dielectric techniques (V).

3. 65 [75] [75] [75] [75] [76] [75] [113] [105] [105] [109] [lOS] [109] spectroscopic measurement. g. for optimizing the production process of glass ceramics [114]. A more subtle form of crystallization, of purely scientific interest, is exhibited by crystals with frozen-in orientational disorder. In these supercooled plastic crystals long range orientational order reappears on annealing just below the freezing temperature [115]. However, the relaxation into the crystalline state in most cases [116] takes much longer than is required to relax external stresses in a non-equilibrium liquid.

Since special circumstances lead to the exceptions obvious from Fig. 6, the finding of a general but rather broad correlation between fragility and nonexponentiality is quite encouraging. Much narrower correlations can however be established when only certain subgroups of materials are considered. This is shown in Fig. 8) from Fig. 6. Our representation of the data in Fig. 7 suggests that the results fall into three categories. The first is the one to which the polymers and the networks belong.

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Disorder Effects on Relaxational Processes: Glasses, Polymers, Proteins by Ranko Richert, Alexander Blumen

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