Interfacial Energy in Phase‐Separated Glasses from Emulsion Rheology

Wondraczek, Lothar; Deubener, Joachim; Pozo, Helena del; Habeck, A.

doi:10.1111/j.1551-2916.2005.00325.x

Cited by 3 publications

(2 citation statements)

References 24 publications

(34 reference statements)

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“…The numerical method is described in the Appendix. The order of magnitude is consistent with the scarce literature on measurements of interfacial tension between glassy melts [45,46], albeit at the lower end of reported values.…”

Section: Physical Propertiessupporting

confidence: 90%

Hydrodynamic coarsening in phase-separated silicate melts

et al. 2015

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Using in-situ synchrotron tomography, we investigate the coarsening dynamics of barium borosilicate melts during phase separation. The 3-D geometry of the two interconnected phases is determined thanks to image processing. We observe a linear growth of the size of domains with time, at odds with the sublinear diffusive growth usually observed in phase-separating glasses or alloys. Such linear coarsening is attributed to viscous flow inside the bicontinuous phases, and quantitative measurements show that the growth rate is well explained by the ratio of surface tension over viscosity. The geometry of the domains is shown to be statistically similar at different times, provided that the microstructure is rescaled by the average domain size. Complementary experiments on melts with a droplet morphology demonstrate that viscous flow prevails over diffusion in the large range of domain sizes measured in our experiments (1 -80 µm).

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Section: Physical Propertiessupporting

confidence: 90%

Hydrodynamic coarsening in phase-separated silicate melts

et al. 2015

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“…7 This method anticipates the same rate controlling species in both stages of the demixing process. Furthermore, different experimental approaches were reported to determine σ ll independent of ripening theory analyzing size 8 and shape of segregated drops, 2,9 which allows in principle the calculation of the coarsening rate if diffusivity of the movable species is known. However, a) Electronic mail: joachim.deubener@tu-clausthal.de.…”

Section: A Coarsening Rate Calculationsmentioning

confidence: 99%

Coarsening kinetics in demixed lead borate melts

Dittmar

Bornhöft

Deubener

2013

The Journal of Chemical Physics

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Lead borate melts have been demixed at temperatures in range from 723 to 773 K for times up to 20 h. It is found that increasing time and temperature lead to characteristic changes in the size distribution of boron trioxide drops in the lead-rich glassy matrix (<80.7 mol. % B2O3). The increase of the mean drop size with annealing time followed the cube root time dependence of diffusion controlled coarsening. The diffusivity of the coarsening process was determined using liquid-liquid interfacial energy associated with drop deformation in glass specimens subjected to uniaxial compression. Diffusion coefficients of coarsening were found to match with those of (207)Pb and (18)O tracer ions in the lead borate system but differ up to four orders of magnitude from the Eyring diffusivity and by a factor of ≈7 from the activation energy of viscous flow. The results indicate that coarsening in demixed lead borate melts is most likely controlled by the short range dynamics of the interaction between lead cations and BO4 units, which are decoupled from the time scales of cooperative rearrangements of the glassy network at T < 1.1 Tg.

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