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The Resource Supercritical extraction of binder from multilayer ceramic capacitors, by Kumar Krishnamurthy, (electronic resource)

Supercritical extraction of binder from multilayer ceramic capacitors, by Kumar Krishnamurthy, (electronic resource)

Creator
Contributor
Summary
Supercritical extraction using carbon dioxide was carried out in a semi-continuous mode on the binder and its components of an acrylate-based system, the results of which were compared with a poly (vinyl butyral)-based system. To investigate the contribution of each of the binder components to overall weight loss of the acrylic-based binder, pure components as well as combination of different components were subjected to supercritical extraction. To enhance the extraction of binder, co-solvents were evaluated on the most extractable binder component and an optimal co-solvent loading was determined. Supercritical extraction experiments were then carried out and the effect of the co-solvent on the extraction profiles was examined. Enhancement in extraction was observed for the acrylic-based system whereas no overall enhancement was observed for the poly (vinyl butyral)-based system. To interpret the dynamics of supercritical extraction, diffusivities of the binder components of the acrylic-based and the poly (vinyl butyral based) multilayer ceramic capacitors were calculated, and were found to be in the same order of magnitude. Finally, visual analysis was performed on the acrylic-based system to suggest a mechanism that led to defects in these green ceramic bodies after the extraction process. Supercritical extraction with carbon dioxide at 10-40 MPa and 55-900C was used to remove binder from multilayer green ceramic bodies. Defects such as cracking and delamination were occasionally observed in the green bodies following the extraction process, and these defects were attributed to pressure gradients that arise during depressurization from conditions of supercritical extraction. A model based on flow in porous media was thus developed to describe the temporal and spatial distribution of pressure within the green body during depressurization. The model incorporated the Peng-Robinson cubic equation of state to describe the pressure-volume-temperature behavior of the supercritical carbon dioxide, and the effect of changes in the viscosity of the supercritical fluid. The effects of the body size and gas-phase permeability on the pressure within the green body were examined
Language
eng
Work
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 August 12, 2009)
  • Vita
Instance
Label
Supercritical extraction of binder from multilayer ceramic capacitors
Title
Supercritical extraction of binder from multilayer ceramic capacitors
Statement of responsibility
by Kumar Krishnamurthy
Creator
Contributor
Thesis advisor
Subject
Genre
Language
eng
Summary
Supercritical extraction using carbon dioxide was carried out in a semi-continuous mode on the binder and its components of an acrylate-based system, the results of which were compared with a poly (vinyl butyral)-based system. To investigate the contribution of each of the binder components to overall weight loss of the acrylic-based binder, pure components as well as combination of different components were subjected to supercritical extraction. To enhance the extraction of binder, co-solvents were evaluated on the most extractable binder component and an optimal co-solvent loading was determined. Supercritical extraction experiments were then carried out and the effect of the co-solvent on the extraction profiles was examined. Enhancement in extraction was observed for the acrylic-based system whereas no overall enhancement was observed for the poly (vinyl butyral)-based system. To interpret the dynamics of supercritical extraction, diffusivities of the binder components of the acrylic-based and the poly (vinyl butyral based) multilayer ceramic capacitors were calculated, and were found to be in the same order of magnitude. Finally, visual analysis was performed on the acrylic-based system to suggest a mechanism that led to defects in these green ceramic bodies after the extraction process. Supercritical extraction with carbon dioxide at 10-40 MPa and 55-900C was used to remove binder from multilayer green ceramic bodies. Defects such as cracking and delamination were occasionally observed in the green bodies following the extraction process, and these defects were attributed to pressure gradients that arise during depressurization from conditions of supercritical extraction. A model based on flow in porous media was thus developed to describe the temporal and spatial distribution of pressure within the green body during depressurization. The model incorporated the Peng-Robinson cubic equation of state to describe the pressure-volume-temperature behavior of the supercritical carbon dioxide, and the effect of changes in the viscosity of the supercritical fluid. The effects of the body size and gas-phase permeability on the pressure within the green body were examined
Cataloging source
MUU
http://library.link/vocab/creatorDate
1984-
http://library.link/vocab/creatorName
Krishnamurthy, Kumar
Degree
M.S.
Dissertation year
2008.
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/relatedWorkOrContributorName
Lombardo, Stephen, 1960-
http://library.link/vocab/subjectName
  • Supercritical fluid extraction
  • Ceramic capacitors
  • Binders (Materials)
Target audience
specialized
Label
Supercritical extraction of binder from multilayer ceramic capacitors, by Kumar Krishnamurthy, (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 August 12, 2009)
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
430232154
Dimensions
unknown
Form of item
electronic
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Specific material designation
remote
System control number
(OCoLC)430232154
System details
Mode of access: World Wide Web
Label
Supercritical extraction of binder from multilayer ceramic capacitors, by Kumar Krishnamurthy, (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 August 12, 2009)
  • Vita
Bibliography note
Includes bibliographical references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
430232154
Dimensions
unknown
Form of item
electronic
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Specific material designation
remote
System control number
(OCoLC)430232154
System details
Mode of access: World Wide Web

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