1997
DOI: 10.1209/epl/i1997-00301-2
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Evidence of a fractional Debye-Stokes-Einstein law in supercooled o-terphenyl

Abstract: { The rotational dynamics of nearly spherical and cylindrical tracers dissolved in supercooled o-terphenyl is studied via the Electron Spin Resonance spectroscopy. On decreasing the t emperature, a sharp crossover is observed from the regime w h ere the D e bye-Stokes-Einstein law (DSE) holds to a n ew one which is accounted for by a fractional DSE (FDSE) Dr / ( = T) ; with 1. Dr is the rotational di usion constant, the s h ear viscosity a n d T the t emperature. Tumbling a n d spinning o f t he c y l i n dric… Show more

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Cited by 90 publications
(143 citation statements)
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“…* The lineshapes in Fig. 2 are strikingly similar to the usual ones of spin probes dissolved in viscous liquids (14,31,33,(36)(37)(38). At low temperatures (Յ90 K) the ESR lineshape exhibits the rigid-limit pattern, namely the reorientation of TEMPOL is very slow (rotational correlation time Ռ max Ϸ 0.1 s).…”
Section: Resultssupporting
confidence: 57%
See 1 more Smart Citation
“…* The lineshapes in Fig. 2 are strikingly similar to the usual ones of spin probes dissolved in viscous liquids (14,31,33,(36)(37)(38). At low temperatures (Յ90 K) the ESR lineshape exhibits the rigid-limit pattern, namely the reorientation of TEMPOL is very slow (rotational correlation time Ռ max Ϸ 0.1 s).…”
Section: Resultssupporting
confidence: 57%
“…Both the FSC and DH in supercooled water drive the breakdown of the SE and DSE relations (18,(26)(27)(28). The DSE breakdown was already observed by ESR in supercooled liquids (31). We evaluated the DSE ratio R DSE ϵ /( f T) (to be constant according to the DSE law).…”
Section: Resultsmentioning
confidence: 99%
“…5,6 This complex dynamics breaks down familiar laws like the Stokes-Einstein (SE) (Refs. [5][6][7][8][9] and Debye-Stokes-Einstein [8][9][10][11][12][13][14][15] laws that account for the coupling of the shear viscosity η with the translational and the rotational diffusion, respectively. Here, we focus on the SE law which for a sphere with radius a and stick boundary conditions reads…”
Section: Introductionmentioning
confidence: 99%
“…* Electronic address: bbagchi@sscu.iisc.ernet.in; URL: http://sscu.iisc.ernet.in/prg/faculty/biman_bagchi.htm In many cases, the ratio τ 1 /τ 2 is found to fall below three. In particular, in supercooled liquids, the ratio is known to approach unity at low temperatures and related issues (like translation-rotation decoupling) that have given rise to considerable amount of discussion [6,7,8,9,10,11,12,13,14,15,16,17]. One often invokes the breakdown of Debye diffusion model, which requires small angle Brownian rotational motion for its validity, due to the emergence of large scale hopping involving large angular jumps.…”
Section: Introductionmentioning
confidence: 99%