X-RAY MICROSCOPY of ‘ TREE-RING’ LATEX PARTICLESWHO: Adam Hitchcock, Harald Stöver, Yew-Meng Hing, BIMR, McMaster
Harald Ade, NCSU
WHERE: Advanced Light Source BL 7.0 Scanning Transmission X-ray Microscope (STXM)
WHEN: 23 Dec 1998 POSTED: 18 Jan 1999
WHAT: A focussed 50 nm beam of highly monochromatic and tunable X-rays is used to make an image of a slice of a latex sphere only 100 nm thick. By varying the X-ray energy the chemical species can be identified and quantified.
Selective energy images of a structured latex particle prepared by a single step synthesis. The 'tree-ring' structure,which is detected only at 285 eV, is associated with variable composition arising from oscillations in the polymerization reaction of the mixed, styrene, chloro-styrene system. Difference in the absorption ON versus OFF rings is only 2%.
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