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• W767998214 abstract "The key features of dynamics of ultraslowing glass forming systems are their universality in diversity. Itsorigin is recognized as one of the greatest challenges of condensed matter physics and materialsengineering in the XXI century. Similar phenomena are observed on approaching the glass transition inlow molecular weight supercooled liquids, polymers, colloidal fluids as well as in solids, for instance inorientationally disordered crystals, spin glass-like magnetic, vortex glasses. Pre-vitreous dynamics is alsoproposed as a general reference for the category of complex liquids/soft matter systems.The upsurge of the primary relaxation time or related dynamical properties is the basic physicalphenomena of the still mysterious previtreous behavior. This means a much more pronounced slowingdown than the Arrhenius pattern observed far above the glass transition temperature. Portraying thisbehavior constitutes one of key checkpoints for theoretical models developed to unwind the glasstransition puzzle. However, none of the aforementioned features can answer the understanding thatgoverns the increase of relaxation time in liquids upon cooling.In this thesis we focus on the above questions studying the dynamics of some materials for which theirmolecules can retain a translational order being orientationally disordered between them upon cooling,which are referred to plastic phases or orientationally disordered (OD) crystalline phases. The workpresented in this thesis potentially extends the knowledge of dynamics of OD phases and orientationallyglasses (OG), a research topic which has gained interest during the last decades.Through this study, especial attention has been devoted to the phenomenological equations accountingto the temperature dependence of the mean relaxation time describing the orientational dynamics .Thestudy was carried out by the use of BDS as well as two complementary experimental techniques. Weshow distortion-sensitive and derivative-based empirical analysis of the validity of leading equations forportraying the previtreous evolution of primary relaxation time. A new method for studying the dynamics ofglass forming systems is introduced and the minimization procedure is validated and discussed.We present the results divided in two topics, the dynamics of the pure compounds and mixed crystals andthe derivative analysis through different existing models.In the first topic we focus on the dynamics of the pure compounds and mixed crystals formed betweencycloheptanol and cyclooctanol as well as the a-relaxation dynamics of 1-cyano-adamantane and itsmixtures with 1-chloro-adamantane. The second topic is divided in two groups of models, linearized andnon-linearized models. In the linearized models we show the application of the derivative based,distortion-sensitive analysis to liquid crystals (LC) and OD phases. We also discuss the results concerningto the cases of the olygomeric liquid epoxy resin (EPON828), neopentylalcohol and neopentylglycolmixture, isooctylcyanobiphenyl and propylene carbonate. The possible empirical correlations between oneof the linearized models with the universal pattern for the high frequency wing of the loss curve for primaryrelaxation time for LCs and OD phases is also shown.In the final part we show that the form of the equation recently introduced by Mauro et al. does not allow asimilar straightforward linearization procedure. Unlike the previous models, the involved parameters arenot correlated with the slope and the intercept of a linear function. In order to solve this problem, we haveintroduced the concept of the enthalpy space.The evidences of the existence of crossovers as well as quantitative descriptions are discussed. We showalso a new procedure for detecting the crossover in a very easy way. A new kind of crossovers whichseems to be impossible to be detected by the classical Stickel transformation is presented." @default.
• W767998214 created "2016-06-24" @default.
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• W767998214 date "2011-07-15" @default.
• W767998214 modified "2023-09-23" @default.
• W767998214 title "Dynamics in orientationally disordered solids" @default.
• W767998214 hasPublicationYear "2011" @default.
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