The bright and the dark side of the sphere: light-stabilized microparticles

Polymer Chemistry ◽

10.1039/d0py01456g ◽

2021 ◽

Author(s):

Christian W. Schmitt ◽

Sarah L. Walden ◽

Laura Delafresnaye ◽

Hannes A. Houck ◽

Leonie Barner ◽

...

Keyword(s):

Green Light ◽

Dark Side ◽

Continuous Irradiation ◽

Disperse Particles

We introduce degradable microparticles, synthesized from prepolymers in a precipitation-like polymerization. The narrow disperse particles are stabilized with continuous irradiation of green light and can be spontaneously degraded in the dark.

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Fungi from the Rhynie chert: a view from the dark side

Transactions of the Royal Society of Edinburgh Earth Sciences ◽

10.1017/s0263593303000324 ◽

2003 ◽

Vol 94 (04) ◽

pp. 457 ◽

Cited By ~ 4

Keyword(s):

Dark Side ◽

Rhynie Chert

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Analysis of 2D and 3D defects associated with precipitation of Cu in silicon

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010008866x ◽

1991 ◽

Vol 49 ◽

pp. 870-871

Author(s):

P.M. Rice ◽

MJ. Kim ◽

R.W. Carpenter

Keyword(s):

Colony Growth ◽

Dark Field ◽

Dark Side ◽

Silicide Phase ◽

Strain Fields ◽

Near Surface ◽

Unknown Composition ◽

Secondary Precipitates ◽

20 Nm ◽

2D And 3D

Extrinsic gettering of Cu on near-surface dislocations in Si has been the topic of recent investigation. It was shown that the Cu precipitated hetergeneously on dislocations as Cu silicide along with voids, and also with a secondary planar precipitate of unknown composition. Here we report the results of investigations of the sense of the strain fields about the large (~100 nm) silicide precipitates, and further analysis of the small (~10-20 nm) planar precipitates.Numerous dark field images were analyzed in accordance with Ashby and Brown's criteria for determining the sense of the strain fields about precipitates. While the situation is complicated by the presence of dislocations and secondary precipitates, micrographs like those shown in Fig. 1(a) and 1(b) tend to show anomalously wide strain fields with the dark side on the side of negative g, indicating the strain fields about the silicide precipitates are vacancy in nature. This is in conflict with information reported on the η'' phase (the Cu silicide phase presumed to precipitate within the bulk) whose interstitial strain field is considered responsible for the interstitial Si atoms which cause the bounding dislocation to expand during star colony growth.

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