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Shape and surface area measurements using scanning electron microscope stereo-pair images of volcanic ash particles

Owen P. Mills and William I. Rose
Shape and surface area measurements using scanning electron microscope stereo-pair images of volcanic ash particles
Geosphere (Boulder, CO) (December 2010) 6 (6): 805-811

Abstract

The shape and surface area of fine particles are traditionally measured using projected or two-dimensional (2D) sections or with nitrogen gas adsorption using the BET (Brunauer, Emmett, and Teller) method. However, 2D sections are incomplete shape descriptors and nitrogen gas adsorption analysis is precluded when the amount of sample is limited, for example, in direct ash cloud sampling. In this study we present a technique for measuring the shape and surface area of individual grains of volcanic ash using scanning electron microscope (SEM) stereo pairs. The application we discuss is the stereoscopic analysis of 25 ash particles in the 4-130 mu m size range from the August 1992 Crater Peak-Spurr eruption, located 130 km west of Anchorage, Alaska. Surface area data are presented from stereo measurements of glass microspheres in the same size range as validation of the technique's accuracy. Differences in surface area values between our technique, 2D shape data, and nitrogen gas adsorption are presented and discussed.


EISSN: 1553-040X
Serial Title: Geosphere (Boulder, CO)
Serial Volume: 6
Serial Issue: 6
Title: Shape and surface area measurements using scanning electron microscope stereo-pair images of volcanic ash particles
Affiliation: Michigan Technological University, Materials Science and Engineering Department, Houghton, MI, United States
Pages: 805-811
Published: 201012
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 18
Accession Number: 2011-006736
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N61°17'60" - N61°17'60", W152°15'00" - W152°15'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201104
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