FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2600171210> ?p ?o ?g. }

• W2600171210 abstract "Recently, there has been great interest in ultrastable glasses formed via vapor deposition, both because of emerging engineering applications of these materials (e.g., active layers in light-emitting diodes and photovoltaics) and, theoretically, as materials for probing the equilibrium properties of glassy materials below their glass transition, based on the conjecture that these materials are equivalent to glassy materials aged over astronomical time scales. We use molecular dynamics simulations to examine the properties of ultrastable vapor-deposited and ordinary polymer glasses. Based on the difference in the energy of the deposited and ordinary films, we estimate the effective cooling rate for the vapor deposited films to be 1 to 3 orders of magnitude larger than that of the ordinary film, depending on the deposition temperature. Similarly, we find an increase in the average segmental relaxation time of the vapor-deposited film compared to the ordinary glass. On the other hand, the normal mode spectrum is essentially identical for the vapor-deposited and the ordinary glass film, suggesting that the high-frequency dynamics should be similar. In short, the segmental relaxation dynamics of the polymer vapor-deposited glass are consistent with those of an ordinary polymer glass with a somewhat slower effective cooling rate. Of course, one would expect a larger effect on dynamics approaching the experimental glass transition, where the cooling rates are much slower than accessible in simulation. To more precisely probe the relationship between the dynamics of these glasses, we examine dynamical heterogeneity within the film. Due to the substantial mobility gradient in the glassy films, we find that it is crucial to distinguish the dynamics of the middle part of the film from those of the entire film. Considering the film as a whole, the average dynamical heterogeneity is dominated by the mobility gradient, and as a consequence the heterogeneity is nearly indistinguishable between the ordinary and vapor deposited glass films. In contrast, in the middle part of the film, where there is almost no mobility gradient, we find the dynamical heterogeneity within the deposited film is somewhat larger than that of the ordinary film at the same temperature. We further show that the scale of the interfacial region grows on cooling in the equilibrium film, but this trend reverses in the glass state. We attribute this reversal in part to a shrinking ratio of the relaxation time in the middle of the film to that of the interfacial layer in the non-equilibrium state. The dynamics in this mobile interfacial layer for the ordinary and deposited film are nearly the same, suggesting that the interfacial region is always in a near-equilibrium state. These results emphasize the importance of distinguishing between interfacial and internal relaxation processes in this emerging class of materials." @default.
• W2600171210 created "2017-04-07" @default.
• W2600171210 creator A5001298955 @default.
• W2600171210 creator A5012762058 @default.
• W2600171210 creator A5044313983 @default.
• W2600171210 date "2017-02-23" @default.
• W2600171210 modified "2023-09-25" @default.
• W2600171210 title "Dynamical heterogeneity in a vapor-deposited polymer glass" @default.
• W2600171210 cites W1507084423 @default.
• W2600171210 cites W1568546143 @default.
• W2600171210 cites W1822616660 @default.
• W2600171210 cites W1860652392 @default.
• W2600171210 cites W1963652484 @default.
• W2600171210 cites W1966444420 @default.
• W2600171210 cites W1967303178 @default.
• W2600171210 cites W1967433114 @default.
• W2600171210 cites W1971354120 @default.
• W2600171210 cites W1971710406 @default.
• W2600171210 cites W1971863006 @default.
• W2600171210 cites W1975863482 @default.
• W2600171210 cites W1976377032 @default.
• W2600171210 cites W1978005636 @default.
• W2600171210 cites W1978667280 @default.
• W2600171210 cites W1984312308 @default.
• W2600171210 cites W1987005947 @default.
• W2600171210 cites W1987438737 @default.
• W2600171210 cites W1991369969 @default.
• W2600171210 cites W1991961068 @default.
• W2600171210 cites W1992496162 @default.
• W2600171210 cites W1998573352 @default.
• W2600171210 cites W2003744849 @default.
• W2600171210 cites W2003909628 @default.
• W2600171210 cites W2004369921 @default.
• W2600171210 cites W2005635106 @default.
• W2600171210 cites W2006676412 @default.
• W2600171210 cites W2007661283 @default.
• W2600171210 cites W2011630584 @default.
• W2600171210 cites W2011963980 @default.
• W2600171210 cites W2013814528 @default.
• W2600171210 cites W2015260266 @default.
• W2600171210 cites W2017040575 @default.
• W2600171210 cites W2018919811 @default.
• W2600171210 cites W2019465613 @default.
• W2600171210 cites W2020828286 @default.
• W2600171210 cites W2021988999 @default.
• W2600171210 cites W2027154261 @default.
• W2600171210 cites W2031641141 @default.
• W2600171210 cites W2032735932 @default.
• W2600171210 cites W2036163045 @default.
• W2600171210 cites W2040179043 @default.
• W2600171210 cites W2046571539 @default.
• W2600171210 cites W2046645394 @default.
• W2600171210 cites W2046799132 @default.
• W2600171210 cites W2047193614 @default.
• W2600171210 cites W2048421180 @default.
• W2600171210 cites W2050945279 @default.
• W2600171210 cites W2055284317 @default.
• W2600171210 cites W2062310210 @default.
• W2600171210 cites W2063039567 @default.
• W2600171210 cites W2066623963 @default.
• W2600171210 cites W2068789638 @default.
• W2600171210 cites W2073554841 @default.
• W2600171210 cites W2077135503 @default.
• W2600171210 cites W2088676857 @default.
• W2600171210 cites W2089634794 @default.
• W2600171210 cites W2091734157 @default.
• W2600171210 cites W2092687160 @default.
• W2600171210 cites W2095571376 @default.
• W2600171210 cites W2101229642 @default.
• W2600171210 cites W2103745164 @default.
• W2600171210 cites W2110739306 @default.
• W2600171210 cites W2114479908 @default.
• W2600171210 cites W2125892558 @default.
• W2600171210 cites W2138286562 @default.
• W2600171210 cites W2138363671 @default.
• W2600171210 cites W2139921601 @default.
• W2600171210 cites W2149846440 @default.
• W2600171210 cites W2150730761 @default.
• W2600171210 cites W2161277915 @default.
• W2600171210 cites W2161554747 @default.
• W2600171210 cites W2161757075 @default.
• W2600171210 cites W2163954245 @default.
• W2600171210 cites W2164767021 @default.
• W2600171210 cites W2165985852 @default.
• W2600171210 cites W2167014913 @default.
• W2600171210 cites W2169412924 @default.
• W2600171210 cites W2278515130 @default.
• W2600171210 cites W2313443906 @default.
• W2600171210 cites W2313970965 @default.
• W2600171210 cites W2315966892 @default.
• W2600171210 cites W2317234974 @default.
• W2600171210 cites W2319778004 @default.
• W2600171210 cites W2322333462 @default.
• W2600171210 cites W2323655816 @default.
• W2600171210 cites W2324374144 @default.
• W2600171210 cites W2326197465 @default.
• W2600171210 cites W2330997458 @default.
• W2600171210 cites W2334385133 @default.
• W2600171210 cites W2342198251 @default.
• W2600171210 cites W2359983707 @default.

• next