Abstract
A direct measurement of the length scale of dynamic heterogeneity in supercooled d-sorbitol has been performed using a multidimensional 13C solid-state NMR experiment. Several models predict that the growth of this length scale is linked to the slowing of dynamics as the glass transition is approached from above. At 275 K (Tg + 7 K), 2.5 ± 1.2 nm heterogeneities are detected in sorbitol. This result and recent results of similar measurements on glycerol, o-terphenyl, and poly(vinyl acetate) are compared to various models. The only model in quantitative agreement with these experimental data is based upon local fluctuations in the configurational entropy.
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