Accession Number : AD0733457

Title :   General Method for Dispersing and Disaggregating Particulate Samples for Quantitative SEM and Optical Microscope Studies.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB

Personal Author(s) : Thaulow,N. ; White,E. W.

Report Date : 01 NOV 1971

Pagination or Media Count : 12

Abstract : The eutectic composition of 60 wt % camphor and 40 wt % naphthalene (C-N) was found to be an ideal medium for preparation of uniform dispersions of a variety of inorganic materials. Particular advantages to the medium include: A melting point of 32C allowing easy storing and handling; The solid rapidly sublimes completely in vacuum leaving no residue to interfere with microscopic observations; The C-N is unreactive with most inorganic powders; In its solid form the C-N is a gently abrasive medium for mechanically breaking down agglomerates and light aggregates; The viscosity of the C-N liquid near the melting point is enough to prevent most materials from fractionating by sedimentation during normal handling times. So far this technique has been found quite satisfactory for dispersing powder samples of alumina, portland cement, tungsten, coal mine dust, bariumtitanate, and rutile. (Author)

Descriptors :   (*COLLOIDS, FILMS), (*NAPHTHALENES, *EUTECTICS), INORGANIC COMPOUNDS, MICROSCOPY, SUBLIMATION, VISCOSITY, HANDLING, SEDIMENTATION, PHASE DIAGRAMS

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE