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)
Resource Information
The item Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource) represents a specific, individual, material embodiment of a distinct intellectual or artistic creation found in University of Missouri-St. Louis Libraries.This item is available to borrow from 1 library branch.
Resource Information
The item Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource) represents a specific, individual, material embodiment of a distinct intellectual or artistic creation found in University of Missouri-St. Louis Libraries.
This item is available to borrow from 1 library branch.
- 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
- Language
- eng
- 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
- 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
- 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)
- 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)
- 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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<div class="citation" vocab="http://schema.org/"><i class="fa fa-external-link-square fa-fw"></i> Data from <span resource="http://link.umsl.edu/portal/Modification-of-nano-and-micro-phase-diamond/qarSuIBcrFE/" typeof="Book http://bibfra.me/vocab/lite/Item"><span property="name http://bibfra.me/vocab/lite/label"><a href="http://link.umsl.edu/portal/Modification-of-nano-and-micro-phase-diamond/qarSuIBcrFE/">Modification of nano and micro-phase diamond powder for enhancement of hydrogen storage, by Alexis Sotomayor-Rivera, (electronic resource)</a></span> - <span property="potentialAction" typeOf="OrganizeAction"><span property="agent" typeof="LibrarySystem http://library.link/vocab/LibrarySystem" resource="http://link.umsl.edu/"><span property="name http://bibfra.me/vocab/lite/label"><a property="url" href="http://link.umsl.edu/">University of Missouri-St. Louis Libraries</a></span></span></span></span></div>
