Publication:
Characterization of particles created by laser-driven hydrothermal processing

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Authors
Camargo, Andres
Subjects
laser-driven hydrothermal processing
characterization
obsidian
tektite
natural glass
Advisors
Menon, Sarath K.
Luhrs, Claudia C.
Date of Issue
2016-06
Date
16-Jun
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
This study examined particles created by laser-driven hydrothermal processing, an innovative technique used for the ablation of submerged materials. Two naturally occurring materials, obsidian and tektite, were used as targets for this technique. Characterization of sample materials before and after laser processing was conducted through multiple techniques such as optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Examination of the untreated base material, in bulk and crushed form, established a baseline for comparison to particles created by laser processing of the same material. Characterization methods provided data of micron- and nano-sized particles, including their crystal structure, microstructure, and chemical composition. The bulk and crushed obsidian and tektite samples contained inclusions and particles rich in several transition elements, most notably iron and titanium. Analysis of liquid media collected after laser processing of bulk obsidian and tektite samples revealed fine particles rich in the same elements. Evidence suggests laser-driven hydrothermal processing separates heavy elements from the mostly amorphous silica matrix encountered in the materials examined.
Type
Thesis
Description
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Department
Mechanical and Aerospace Engineering
Mechanical and Aerospace Engineering (MAE)
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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