TITLE

Single molecule probe reports of dynamic heterogeneity in supercooled ortho-terphenyl

AUTHOR(S)
Leone, Lindsay M.; Kaufman, Laura J.
PUB. DATE
March 2013
SOURCE
Journal of Chemical Physics;Mar2013, Vol. 138 Issue 12, p12A524
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The rotational dynamics of three perylene diimide dyes are studied on the single molecule (SM) level in ortho-terphenyl (OTP) near the glass transition temperature (Tg). At all temperatures probed, spanning 1.03-1.06 Tg, each of the three probes exhibits rotational correlation times, Ï„c, that span more than a decade, consistent with the presence of spatially heterogeneous dynamics in OTP. No trend is found as a function of temperature, but a trend as a function of probe is observed: Average probe rotational correlation time scales inversely with breadth of SM Ï„c distribution, with faster probes exhibiting broader Ï„c distributions. This implies that dynamic exchange occurs on and below time scales associated with probe rotation. Extrapolating FWHM of rotational relaxation times to the structural relaxation time of the host shows that the Ï„c distribution would span nearly two decades in the limit of no probe temporal averaging. Comparison with SM measurements in glycerol suggests that OTP demonstrates a greater degree of spatially heterogeneous dynamics in this temperature range than does glycerol.
ACCESSION #
86446801

 

Related Articles

  • Communication: Crystallite nucleation in supercooled glycerol near the glass transition. Yuan, Hai-Feng; Xia, Ted; Plazanet, Marie; Demé, Bruno; Orrit, Michel // Journal of Chemical Physics;1/28/2012, Vol. 136 Issue 4, p041102 

    Heterogeneity and solid-like structures found near the glass transition provide a key to a better understanding of supercooled liquids and of the glass transition. However, the formation of solid-like structures and its effect on spatial heterogeneity in supercooled liquids is neither well...

  • The length scale dependence of viscosity approaching the glass transition in glycerol. Dixon, Paul K.; Nagel, Sidney R.; Weitz, David A. // Journal of Chemical Physics;5/15/1991, Vol. 94 Issue 10, p6924 

    We measure the viscosity of glycerol by using photon correlation spectroscopy to observe the Brownian motion of small (∼100 nm) polystyrene spheres. By comparing the viscosity measured with different size spheres, we can measure the length scale dependence of the viscosity as the liquid is...

  • Model of the glass transition. Mansfield, Marc L. // Journal of Chemical Physics;11/8/1995, Vol. 103 Issue 18, p8124 

    This paper examines the three well-known empiricisms that accompany the glass transition of fragile glass-forming liquids: the unusual thermodynamic behavior of supercooled liquids that is usually called the Kauzmann paradox, the temperature dependence of the relaxation time as embodied in the...

  • Undercooled liquid-to-glass transition during continuous cooling in Pd-Cu-Ni-P alloys. Nishiyama, N.; Horino, M.; Haruyama, O.; Inoue, A. // Applied Physics Letters;6/26/2000, Vol. 76 Issue 26 

    The glass-transition behavior from the supercooled liquid of a Pd[sub 40]Cu[sub 30]Ni[sub 10]P[sub 20] alloy was investigated by employing a power-compensated differential scanning calorimetry under continuous cooling. At cooling rates of 0.83, 1.17, and 1.67 K/s, the transition was clearly...

  • Normal mode analysis of liquid CS2: Velocity correlation functions and self-diffusion constants. Moore, P.; Keyes, T. // Journal of Chemical Physics;5/1/1994, Vol. 100 Issue 9, p6709 

    Normal mode analysis (NMA) is applied in a molecular-dynamics simulation of liquid CS2, modeled with a potential including internal degrees of freedom. The entire supercooled liquid range, from the glass transition at 100 K to melting at 165 K, and the normal liquid from 165 to 293 K, are...

  • Third harmonics nonlinear susceptibility in supercooled liquids: A comparison to the box model. Brun, C.; Crauste-Thibierge, C.; Ladieu, F.; L'Hôte, D. // Journal of Chemical Physics;5/21/2011, Vol. 134 Issue 19, p194507 

    The box model, originally introduced to account for the nonresonant hole burning (NHB) dielectric experiments in supercooled liquids, is compared to the measurements of the third harmonics P3 of the polarisation, reported recently in glycerol, close to the glass transition temperature Tg [C....

  • Poisson's ratio and the fragility of glass-forming liquids. Novikov, V. N.; Sokolov, A. P. // Nature;10/21/2004, Vol. 431 Issue 7011, p961 

    The nature of the transformation by which a supercooled liquid‘freezes’to a glass-the glass transition-is a central issue in condensed matter physics but also affects many other fields, including biology. Substantial progress has been made in understanding this phenomenon over the...

  • Thermodynamic signature of growing amorphous order in glass-forming liquids. Biroli, G.; Bouchaud, J.-P.; Cavagna, A.; Grigera, T. S.; Verrocchio, P. // Nature Physics;Oct2008, Vol. 4 Issue 10, p771 

    Supercooled liquids exhibit a pronounced slowdown of their dynamics on cooling without showing any obvious structural or thermodynamic changes. Several theories relate this slowdown to increasing spatial correlations. However, no sign of this is seen in standard static correlation functions,...

  • Pressure and temperature dependences of the relaxation dynamics of cresolphthalein-dimethylether: Evidence of contributions from thermodynamics and molecular interactions. Paluch, Marian; Ngai, K. L.; Hensel-Bielowka, Stella // Journal of Chemical Physics;6/22/2001, Vol. 114 Issue 24 

    The relaxation dynamics of a low molecular supercooled liquid, cresolphthalein-dimethylether (KDE), has been investigated in the vicinity of glass transition temperature by dielectric relaxation measurements. Glass transition is approached and studied by the use of isothermal and isobaric paths....

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics