Lect26_notes

an exercise in futility handle a sample routinely

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Unformatted text preview: imen preparation partly explains popularity (Second reason is ease of image interpretation) CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 6 Dirty Samples Need Cleaning! ! ! ! ! ! ! •  An exercise in futility: –  Handle a sample routinely while mechanical testing –  Section sample using diamond saw with dirty coolant –  Glue to Al stub –  Put on gloves while transferring to SEM Sample must be clean and oil (including finger grease) free CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 7 Cleaning Samples! ! ! ! ! ! ! •  Ultrasonic bath in acetone / isopropanol –  Acetone leaves a residue that an isopropanol rinse washes away •  Subsequent handling with gloves or tweezers •  Also, option for using plasma cleaner Once sample transferred to microscope, remove gloves! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 8 Plasma Cleaning! ! ! ! ! ! ! •  Especially important when imaging at low kV •  Effectively removes hydrocarbon contamination •  Minimizes seeing history of scanned areas as magnification droppe...
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