Effects of confinement of the 4.0 nm pores of Vycor glass on the alpha relaxation associated with the glass transition were investigated for three glass-forming liquids, glycerol, propylene glycol and propylene carbonate, by dielectric relaxation spectroscopy. The relaxation shifts to lower temperatures in the isochronal (constant-frequency) measurements and to higher frequencies in the isothermal measurements for the confined liquids as compared to the bulk. Confinement induces a broadening of the relaxation and a change of its shape, The results are discussed in relation to the characteristic length of the glass transition (cooperativity length).
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Pissis et al. (1994) studied this question.
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