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- W2077340210 abstract "The triplet state of positronium, o-Ps, is used as a probe to characterize a starch–20% w/w sucrose matrix as a function of temperature (T). A two-step decomposition (of sucrose, and then starch) starts at 440 K as shown by a decrease in the o-Ps intensity (I3) and lifetime (τ3), the latter also disclosing the occurrence of a glass transition. Upon sucrose decomposition, the matrix acquires properties (reduced size and density of nanoholes) that are different from those of pure starch. A model is successfully established, describing the variations of both I3 and τ3 with T and yields a glass transition temperature, Tg = (446 ± 2) K, in spite of the concomitant sucrose decomposition. Unexpectedly, the starch volume fraction (as probed through thermal gravimetry) decreases with T at a higher rate than the free volume fraction (as probed through PALS)." @default.
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- W2077340210 date "2010-01-01" @default.
- W2077340210 modified "2023-10-15" @default.
- W2077340210 title "Characterization of a sucrose/starch matrix through positron annihilation lifetime spectroscopy: unravelling the decomposition and glass transition processes" @default.
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- W2077340210 doi "https://doi.org/10.1039/c0cp00681e" @default.
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