Publications

Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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AIChE Annual Meeting, Conference Proceedings

Johannes, Justine E.; Dimos, Duane B.; Stinnett, Regan W.; Smith, Paul M.

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Stinnett, Regan W.; Dimos, Duane B.; Johannes, Justine E.

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Dimos, Duane B.

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Dimos, Duane B.; Johannes, Justine E.; Stinnett, Regan W.

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Stinnett, Regan W.; Dimos, Duane B.; Johannes, Justine E.

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Carling, Robert W.; Zimmerman, Jonathan A.; Bielejec, Edward S.; Marquis, Emmanuelle M.; Dimos, Duane B.; Swartzentruber, Brian S.; Zavadil, Kevin R.; San Marchi, Christopher W.; Phillips, Julia M.; Webb, Edmund B.; Foiles, Stephen M.; Hearne, Sean J.; Hoyt, Jeffrey J.; Morales, Alfredo M.; Seel, S.C.

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Dimos, Duane B.

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Dimos, Duane B.

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Dimos, Duane B.

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Proposed for publication in the Journal of Materials Research.

Bell, Nelson S.; Bell, Nelson S.; Cesarano, Joseph C.; Voigt, James A.; Lockwood, Steven J.; Dimos, Duane B.

Chemically prepared zinc oxide powders are fabricated for the production of high aspect ratio varistor components. Colloidal processing was performed to reduce agglomerates to primary particles, form a high solids loadingslurry, and prevent dopant migration. The milled and dispersed powder exhibited a viscoelastic to elastic behavioral transition at a volume loading of 43-46%. The origin of this transition was studied using acoustic spectroscopy, zeta potential measurements, and oscillatory rheology. The phenomenon occurs due to a volume fraction solids dependent reduction in the zeta potential of the solid phase. It is postulated to result from divalent ion binding within the polyelectrolyte dispersant chain and was mitigated using a polyethylene glycol plasticizing additive. This allowed for increased solids loading in the slurry and a green body fabrication study to be presented in our companion paper.

Proposed for publication in the Journal of Materials Research.

Bell, Nelson S.; Bell, Nelson S.; Voigt, James A.; Tuttle, Bruce T.; Dimos, Duane B.

Chemically prepared zinc oxide powders were processed for the production of high aspect ratio varistor components (length/diameter >5). Near-net-shape casting methods including slip casting and agarose gelcasting were evaluated for effectiveness in achieving a uniform green microstructure that densifies to near theoretical values during sintering. The structure of the green parts was examined by mercury porisimetry. Agarose gelcasting produced green parts having low solids loading values and did not achieve high fired density. Isopressing the agarose cast parts after drying raised the fired density to greater than 95%, but the parts exhibited catastrophic shorting during electrical testing. Slip casting produced high green density parts, which exhibit high fired density values. The electrical characteristics of slip-cast parts are comparable with dry-pressed powder compacts.

Beauchamp, Edwin K.; Dimos, Duane B.

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Bell, Nelson S.; Dimos, Duane B.

Calculations of the Hamaker constants representing the van der Waals interactions between conductor, resistor and dielectric materials are performed using Lifshitz theory. The calculation of the parameters for the Ninham-Parsegian relationship for several non-aqueous liquids has been derived based on literature dielectric data. Discussion of the role of van der Waals forces in the dispersion of particles is given for understanding paste formulation. Experimental measurements of viscosity are presented to show the role of dispersant truncation of attractive van der Waals forces.