The Resource Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource)

Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource)

Label
Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage
Title
Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage
Statement of responsibility
by Alexis Sotomayor-Rivera
Creator
Contributor
Thesis advisor
Subject
Genre
Language
eng
Summary
Micron and nano-phase diamond powders were doped with boron in order to change their various chemical properties. Diamond possesses several technologically important properties including extreme hardness, high electrical resistance, chemical inertness, high thermal conductivity, high electron hole mobilities, and optical transparency. Boron-doping of diamond powders via Thermal Diffusion Process was used in this study. Natural boron contains 80.1% 11B and 19.9% 10B. 10B has large neutron capture cross section with the reaction 10B(n, [alpha])7Li. The energy release in the reaction is rather high (2.71 MeV), facilitating radiation defects in the sample. The introduction of boron atoms also changed the structure and properties of the diamond powder including resistance to oxidation. Following doping with boron, the diamond powders were irradiated by thermal neutrons by fluence values of 3x1015, and 4.3x1018 n/cm2 at the Missouri University Research Reactor (MURR). The creation of micro-porous structure in diamond powders for storage of hydrogen is discussed. Prompt Gamma Neutron Activation Analysis was used to determine the concentration of boron in the diamond powder. Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), and Thermogravimetric Analysis (TGA) were also employed to study the morphology and structure of the diamond particles. Raman spectroscopy showed that glassy and microcrystalline carbon structures were formed on irradiation. A significant amount of boron was diffused into both nano and micron size diamond powders. The boron concentration before and after irradiation suggested that about 35% 10B interacted with neutrons. Hydrogen was diffused into both micron and nano size diamond powder before and after boron-doping, and also after irradiation on to evaluate the feasibility of the proposed technique for enhancement of hydrogen storage capacity of diamond powders. Hydrogen storage capacity of undoped-nontreated micron size diamond powder was 0.51 wt% H2. Hydrogen storage capacity of diamond power when treated in hydrogen plasma was about 1.47 wt% H2. Surprisingly hydrogen was not detected in boron-doped, irradiated diamond powders by PGNAA. One of the reasons could be the sample amount since the lower limit of detection of total H2 by PGNAA is 3.93 ug/g of sample. The Raman spectrum showed the existence of CH bonds suggesting the presence of hydrogen in the sample
Cataloging source
MUU
http://library.link/vocab/creatorDate
1963-
http://library.link/vocab/creatorName
Sotomayor-Rivera, Alexis
Degree
Ph. D.
Dissertation year
2007.
Granting institution
University of Missouri-Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorDate
1953-
http://library.link/vocab/relatedWorkOrContributorName
  • Ghosh, Tushar K.
  • Prelas, Mark A.
http://library.link/vocab/subjectName
  • Nanostructured materials
  • Diamond powder
  • Hydrogen
Target audience
specialized
Label
Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource)
Instantiates
Publication
Note
  • The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file
  • Title from title screen of research.pdf file (viewed on October 16, 2007)
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
mixed
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
174284382
Dimensions
unknown
Form of item
electronic
Governing access note
Access is limited to the campuses of the University of Missouri
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Specific material designation
remote
System control number
(OCoLC)174284382
System details
Mode of access: World Wide Web
Label
Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource)
Publication
Note
  • The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file
  • Title from title screen of research.pdf file (viewed on October 16, 2007)
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
mixed
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
174284382
Dimensions
unknown
Form of item
electronic
Governing access note
Access is limited to the campuses of the University of Missouri
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Specific material designation
remote
System control number
(OCoLC)174284382
System details
Mode of access: World Wide Web

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