Pierangelo Rolla
University of Pisa
83 Papers
831 Citations
Pierangelo Rolla is an academic researcher from University of Pisa. The author has contributed to research in topics: Glass transition & Dielectric. The author has an hindex of 32, co-authored 83 publications. Previous affiliations of Pierangelo Rolla include National Research Council.
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Papers
Dielectric response analysis of a conducting polymer dominated by the hopping charge transport
TL;DR: In this article, the authors measured poly(3n-decylpyrrole in the 80-330 K interval to characterize the charge transport behavior of the system and attributed the observed relaxation to the hopping charge transport, as further confirmed by the temperature behaviour of the relaxation strength.
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Interdependence of primary and Johari-Goldstein secondary relaxations in glass-forming systems.
Khadra Kessairi,Simone Capaccioli,Daniele Prevosto,Mauro Lucchesi,Soheil Sharifi,Pierangelo Rolla +5 more
TL;DR: Evidence from broadband dielectric spectroscopy that the dynamics of the primary alpha- and secondary Johari-Goldstein beta-processes are strongly correlated in different glass-forming systems over a wide temperature T and pressure P range is reported, indicating the relevance of the JG relaxation phenomenon in glass transition.
114
Unusual deviations from bulk behavior in ultrathin films of poly(tert-butylstyrene): can dead layers induce a reduction of T(g)?
TL;DR: A profile of thermal expansivity is deduced that explains the experimental data and previous observations in polymer nanocomposites and implies an enhancement of the molecular mobility, without the presence of any free surface, but dead layers.
99
Bond-controlled configurational entropy reduction in chemical vitrification
TL;DR: Dielectric and photon-correlation measurements reveal the origin of the similarity in the dynamical behaviour of physical and chemical glass formers and make a connection between the reduction in configurational entropy and the number of chemical bonds, a quantity that can be controlled in experiments.
79
Identifying the genuine Johari–Goldstein β-relaxation by cooling, compressing, and aging small molecular glass-formers
Simone Capaccioli,Daniele Prevosto,Mauro Lucchesi,Pierangelo Rolla,Riccardo Casalini,K. L. Ngai +5 more
TL;DR: In this article, the different nature of multiple secondary relaxations for the glass-formers dipropyleneglycol-dibenzoate and benzoin-isobutylether has been investigated by varying temperature and pressure in the equilibrium liquid and glassy states, as well as by monitoring the structural recovery after a rapid quenching of the liquid to form a glass.
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