Liquid immiscibility in regions of localized shock melting in meteorite Elga

The regions of localized shock melting (melt pockets) in one of silicate inclusions in IIE iron meteorite Elga were investigated with EMPA, SEM, TEM and Raman spectroscopy. It has been established that the mechanism of formation of melt pockets in Elga is of a mixed nature, associated not only with the melting in situ of the silicate matrix, but also with the intrusion of portions of the melted schreibersite-oxide rim inside the silicate inclusion. Melt pockets have an emulsion texture, which is a sign of phase separation by liquid immiscibility in high-temperature shock melts. The emulsion texture, formed by droplet-shaped exsolutions of siderite in the schreibersite matrix of one of the melt pockets, has all the features of phase separation by liquid immiscibility at superliquidus temperatures and thus convincingly indicates the extraterrestrial origin of siderite in the Elga meteorite.

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Glass Microstructure: Phase Separation and Liquid Immiscibility

Fundamentals of Inorganic Glasses ◽

10.1016/b978-0-08-057150-8.50009-4 ◽

1994 ◽

pp. 61-86 ◽

Cited By ~ 6

Author(s):

Arun K. Varshneya

Keyword(s):

Phase Separation ◽

Liquid Immiscibility

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In situ microscopic studies on the structures and phase behaviors of SF/PEG films using solid-state NMR and Raman imaging

Physical Chemistry Chemical Physics ◽

10.1039/c6cp03314h ◽

2016 ◽

Vol 18 (24) ◽

pp. 16353-16360 ◽

Cited By ~ 7

Author(s):

Congheng Chen ◽

Ting Yao ◽

Sidong Tu ◽

Weijie Xu ◽

Yi Han ◽

...

Keyword(s):

Phase Separation ◽

Solid State Nmr ◽

Random Coil ◽

Rich Domain ◽

Microscopic Studies ◽

Helix Conformation ◽

Phase Behaviors ◽

Protein Rich ◽

Β Sheet

SF was incompatible with PEG in some extent, and the phase separation took place in their blend film. The conformation of SF in the interface between SF and PEG was changed to the β-sheet, while that in the protein-rich domain remained in the random coil and/or helix conformation.

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Rubber-modified epoxies: In situ detection of the phase separation by differential scanning calorimetry

Polymer ◽

10.1016/0032-3861(93)90528-i ◽

1993 ◽

Vol 34 (18) ◽

pp. 3960-3961 ◽

Cited By ~ 6

Author(s):

Dong Pu Fang ◽

C.C. Riccardi ◽

R.J.J. Williams

Keyword(s):

Differential Scanning Calorimetry ◽

Phase Separation ◽

Scanning Calorimetry ◽

In Situ Detection

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Structure of Microphase-Separated Silica/Siloxane Molecular Composites

MRS Proceedings ◽

10.1557/proc-171-57 ◽

1989 ◽

Vol 171 ◽

Cited By ~ 8

Author(s):

Dale W. Schaefer ◽

James E. Mark ◽

David Mccarthy ◽

Li Jian ◽

C. -C. Sun ◽

...

Keyword(s):

Phase Separation ◽

Kinetic Studies ◽

Organic Content ◽

Small Particles ◽

X Ray ◽

Filled Elastomers ◽

Polymeric Networks ◽

Large Particles ◽

Molecular Composites

ABSTRACTThe structure of several classes of silica/siloxane molecular composites is investigated using small-angle x-ray and neutron scattering. These filled elastomers can be prepared through different synthethic protocols leading to a range of fillers including particulates with both rough and smooth surfaces, particulates with dispersed interfaces, and polymeric networks. We also find examples of bicontinuous filler phases that we attribute to phase separation via spinodal decomposition. In-situ kinetic studies of particulate fillers show that the precipitate does not develop by conventional nucleation-and-growth. We see no evidence of growth by ripening whereby large particles grow by consumption of small particles. Rather, there appears to be a limiting size set by the elastomer network itself. Phase separation develops by continuous nucleation of particles and subsequent growth to the limiting size. We also briefly report studies of polymer-toughened glasses. In this case, we find no obvious correlation between organic content and structure.

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