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You searched on: Author: andrew allen

Displaying records 61 to 70 of 74 records.
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61. The Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed YSZ Deposits During Annealing
Published: 3/1/1999
Authors: H Boukari, Andrew John Allen, Gabrielle Gibbs Long, J Ilavsky, Jay S Wallace, C C Berndt, H Herman
Abstract: We have studied the microstructure of thick plasma-sprayed yttrium-stabilized zirconia deposits fabricated from different initial feedstock particle size (32, 47, 56 and 88) m in a series of mulitiple and Porod small-angle neutron scattering experim ...

62. The Surface Area of Cement Paste as Measured by Neutron Scattering -- Evidence for Two C-S-H Morphologies
Published: 10/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Small-angle neutron scattering was used to measure the effect of water-to-cement ratio [w/c] and cement batch variation on the surface area of ordinary Portland cement [opc] paste after hydration for 28 days at room temperature, and to measure the de ...

63. Multiple Small-Angle Neutron Scattering
Published: 9/1/1998
Authors: Gabrielle Gibbs Long, Susan T Krueger, Andrew John Allen
Abstract: Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly use ...

64. Determination of the Neutron Scattering Contrast of Hydrated Portland Cement Paste Using H^d2^0/D^d2^0
Published: 6/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Accurate measurements of the surface area of cement based materials using small-angle neutron scattering (SANS) require determination of the neutron scattering contrast between the C-S-H gel and H6d2^O. Because the C-S-H gel has a poorly understood ...

65. Anisotropic Microstructure of Plasma-Sprayed Deposits
Published: 4/1/1998
Authors: J Ilavsky, Gabrielle Gibbs Long, Andrew John Allen, L Leblanc, M Prystay, C Moreau, Alan H Band
Abstract: The microstructure of plasma-sprayed deposits [PSD] is dominated by two void systems-interlamellar pores and intralamellar cracks - each with a different anisotropy. Varying anisotropies and crack-to-pore ratios within PSDs are responsible for the a ...

66. USAXS Studies of Silica Fume Additives in Cements and Concrete
Published: 4/1/1998
Authors: Andrew John Allen, Richard A Livingston
Abstract: Supplementary cementitious materials like silica fume, which are added to the cement mix and react with calcium ions in the pore solution, enhance the production of calcium-silicate-hydrate gel and modify the microstructure in other ways. By combinin ...

67. Evolution of the Microstructure of Plasma-Sprayed Deposits During Heating
Published: 1/1/1998
Authors: Gabrielle Gibbs Long, Andrew John Allen, J Ilavsky
Abstract: The evolution of the void microstructure of yttria-stabilized zirconia [YSZ] plasma-sprayed deposits [PSD] was studied as a function of heating in air from room temperature to 1400 C, and during a constant temperature hold at 1100 C for 19 hours. ...

68. Advanced Neutron and X-Ray Techniques for Insights Into the Microstructure of EB-PVD Thermal Barrier Coatings
Published: Date unknown
Authors: A Kulkarni, A N Goland, H Herman, Andrew John Allen, T A Dobbins, F DeCarlo, J Ilavsky, S Fang, P Lawton
Abstract: The ongoing quest to increase gas turbine efficiency and performance (increased thrust) provides a driving force for materials development. While improved engine and usage of novel materials provide solutions for increased engine operating temperatur ...

69. Characterization of Solid Oxide Fuel Cell Layers by Computed X-Ray Microtomography and Small-Angle Scattering
Published: Date unknown
Authors: Andrew John Allen, T A Dobbins, J Ilavsky, F Zhao, A Virkar, J Almer, F DeCarlo

70. Microstructural Control and Alignment of Template-Synthesized Gold Nanowires in Suspension
Published: Date unknown
Authors: Andrew John Allen, Vincent A Hackley, R Liu, S B Lee, Jan Ilavsky
Abstract: We use ultrasmall-angle X-ray scattering to measure the diameter size distributions of Au nanowires in suspension. Au nanowires are synthesized by electrodeposition in a well-ordered alumina template. The diameter distribution is quantitatively corr ...

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