Lect26_notes

30 sampling particlespowders prepare very

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: XRD, SEM & Microanalysis: Lecture 26 ! 28 Particles! ! ! ! ! ! ! •  Sprinkle a dust of particles onto a stub with a double stick pad mounted –  What possibility is there that a representative sampling of the original powder is being imaged –  Need to consider a better way to ensure a quality result CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 29 Nucleopore Filters! ! ! ! ! ! ! •  Polycarbonate films with well controlled uniform holes (~0.2µm holes work well) –  Prepare dispersion of particles in water (or other dispersant) –  Use vacuum filtration apparatus to pull suspension of particles through filter, leaving uniform, non-agglomerated dispersion of particles on filter –  Cut section of filter –  Roll onto stub prepainted with carbon paint •  Carbon paint wicks through pores of filter providing conductive pathway –  Carbon coat to complete specimen preparation CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 30 Sampling Particles/Powders! ! ! •  ! ! ! ! •  Prepare very dilute dispersion of powder Use vacuum filtration apparatus to filter particles with nuclepore filter •  Reduced tendency for...
View Full Document

Ask a homework question - tutors are online