"Multi-Technique Problem Solving in an Industrial
Environment"
Shell, Thornton Laboratories, Chester-
Wednesday 6th of January 1999
"Using the Millbrook Chemical Microscope as
part of a Multi-Technique Analysis "
J Eccles, (Millbrook Instruments Ltd)
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Figure 17. The Milbrook Chemical Microscope |
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The Millbrook System (Figure 17) is a small bench SIMS machine,
which places the emphasis on ease of use. Dr. Eccles gave a description of both the
machine and its particular powers, SEM/EDX plus SIMS. He gave examples of combined use on
Plasma modified PTFE implants and showed the XPS data (Fig. 18b) from the PTFE coating
plus Ar and the O2 plasma. Then compared the data with SIMS (18b) showing clear
differences in the ion intensity ratio’s. The instrument showed good positive and
negative ion intensity information (c-f) , The two sets of data were then compared with
contact angle data which showed the treatments gave a more hydrophilic surface as required
(g). However, the treatments are not stable and revert back to the original PTFE surface,
information which corelated with the SIMS and XPS data from the aged samples.
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(a)
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(c)
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(b) |
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(g) |
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(d)
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(e)
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(f)
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Figure 18.
(a) SIMS of PTFE before plasma treatment
(b) PTFE contact angles before and after treatment
(c) +ve SIMS spectrum from oxygen plasma modified PTFE
(d) -ve SIMS spectrum from oxygen plasma modified PTFE
(e) +ve SIMS spectrum from argon plasma modified PTFE
(f) -ve SIMS spectrum from argon plasma modified PTFE
(g) Table showing contact angle data for treated and untreated, fresh and aged samples |
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