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Thanks for the suggestions. I find that the Cl content of epoxies is too
low to produce a great enough Cl Ka count rate in EDS such that the epoxy
can be identified unambiguously in small pores. Someone has suggested to
me to pour molten eutectic Pb-Bi or Sn-Bi over the sample within a mold,
embed the resulting cylinder in Duroplast, and then re-melt the embedded
metal enclosing the sample in a mounting press. Apparently these metal
mixtures are very effective at penetrating pore spaces.
Brian
> JEOL Probe Users Listserver
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> Moderator: Ellery Frahm, [log in to unmask],
> Electron Microprobe Lab, University of Minnesota
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> *
>
> Hello Brian,
>
> Many of the epoxies that I deal with contain a small amount of Chlorine
> and I frequently use it as a marker.
> I don't know if this would be relevant to your system but I occasionally
> see Brominated hydrocarbons (sometimes with an Antimony compound)
> incorporated into epoxy resins. They light up nicely in a back-scattered
> electron image at much lower beam currents and with much better
> resolution, (and it's unlikely that either will be present in your test
> material)
>
> Cheers
> Jeff Wessel
> Boeing M&PT
> Seattle, WA
>
> -----Original Message-----
> From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
> Behalf Of Brian Joy
> Sent: Tuesday, June 12, 2012 12:30 PM
> To: [log in to unmask]
> Subject: [PROBEUSERS] adding impurity to epoxy
>
> JEOL Probe Users Listserver
>
> Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab,
> University of Minnesota
>
> Post a message: send your message to [log in to unmask]
>
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>
>
> *
>
> Hi everyone,
>
> I am working on an X-ray mapping project and would like to identify epoxy
> that has infiltrated pore spaces and fractures in shale. The
> complications are 1) the pore spaces are typically no more than a few
> microns across and 2) carbonaceous material is abundant within the
> samples. The carbonaceous material always contains some amount of sulfur,
> and so it can often be distinguished by this means. However, I would like
> to unambiguously identify epoxy that has infiltrated the sample (or verify
> that it hasn't infiltrated). Does anyone have experience with adding a
> tracer element (as a solute?) to epoxy for this purpose? The
> concentration of the element would need to be great enough that it could
> be detected via EDS (SDD) in micron-scale pore spaces while using a
> relatively short dwell time (not much longer than 20 ms, with probe
> current not exceeding 100 nA). I'd appreciate any advice.
>
> Brian
>
> --
> Brian Joy
> Electron Microprobe and ESEM Lab
> Queen's Facility for Isotope Research
> Department of Geological Sciences and Geological Engineering Queen's
> University
> 36 Union Street
> Kingston, Ontario K7L 3N6
>
> cell phone: 530-220-0434
> lab phone: 613-533-2595
> fax: 613-533-6592
>
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--
Brian Joy
Electron Microprobe and ESEM Lab
Queen's Facility for Isotope Research
Department of Geological Sciences and Geological Engineering
Queen's University
36 Union Street
Kingston, Ontario K7L 3N6
cell phone: 530-220-0434
lab phone: 613-533-2595
fax: 613-533-6592
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