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You searched on: Author: andrew allen

Displaying records 21 to 30 of 78 records.
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21. Relationships between Composition and Density of Tobermorite, Jennite, and Nanoscale CaO-SiO2-H2O
Published: 5/16/2010
Authors: Andrew John Allen, Jeffrey Thomas, Hamlin M Jennings
Abstract: Relationships between composition, mass density, and atomic packing density for CaO{SiO2{H2O (C{S{H) gel, the main hydration product of ce- ment, and its mineral analogues tobermorite and jennite, are examined. A phase diagram approach is proposed ...

22. Hydration kinetics and microstructure development of normal and CaCl2 accelerated tricalcium silicate pastes
Published: 10/26/2009
Authors: Andrew John Allen, Jeffrey J. Thomas, Hamlin M Jennings
Abstract: Microstructure development and the kinetics of hydration of pure tricalcium silicate (C3S) and CaCl2-accelerated C3S pastes were investigated by performing isothermal calorimetry and in situ small-angle neutron scattering (SANS) measurements on para ...

23. Glassy Carbon as an Absolute Intensity Calibration Standard for Small Angle Scattering
Published: 8/19/2009
Authors: Andrew John Allen, Jan Ilavsky, Fan Zhang, Gabrielle G Long, Pete R. Jemian
Abstract: Absolute calibration of small-angle scattering (SAS) intensity data (in units of differential cross-section per unit sample volume per unit solid angle) is essential for many important aspects of quantitative SAS analysis, such as obtaining the numbe ...

24. Characterization of Fly Ash Reactivity in Hydrating Cement by Neutron Scattering
Published: 7/14/2009
Authors: W Bumrongjaroen, Richard A Livingston, Dan A Neumann, Andrew John Allen
Abstract: A combination of small-angle and inelastic neutron scattering studies are presented to elucidate the different effects of Class F and Class C fly ash additions on microstructure development in hydrating cement (and concrete). Small angle neutron sca ...

25. Annealing Behavior of Atomic Layer Deposited HfO2 Films Studied by Synchrotron X-Ray Reflectivity and Grazing Incidence Small Angle Scattering
Published: 6/30/2009
Authors: Martin L Green, Andrew John Allen, J. L. Jordan-Sweet, Jan Ilavsky
Abstract: New results are presented for the annealing behavior of ultrathin complementary-metal-gate-semiconductor (CMOS) gate-dielectric (high-) HfO2 films grown by atomic layer deposition (ALD). A series of ALD HfO2 dielectric films has been stu ...

26. Ultra-small-angle X-ray scattering at the Advanced Photon Source
Published: 6/12/2009
Authors: Pete R. Jemian, Jan Ilavsky, Andrew John Allen, Fan Zhang, Lyle E Levine, Gabrielle G. Long
Abstract: The design and operation of a versatile ultra-small-angle X-ray scattering (USAXS) instrument at the Advanced Photon Source (APS) at Argonne National Laboratory are presented. The instrument is optimized for the high brilliance and low emittance of a ...

27. Multi-Scale Microstructure Characterization of Solid Oxide Fuel Cell Assemblies with Ultra Small-Angle X-Ray Scattering
Published: 6/11/2009
Authors: Andrew John Allen, Jan Ilavsky, Artur Braun
Abstract: The structure of three solid oxide fuel cell assemblies with 200 micrometers nominal thick-ness in the transverse plane, before and after operation, and with and without sulfur con-taining fuel, is quantified with ultra small angle x-ray scattering ( ...

28. Process-Controlled Plasma-Sprayed Yttria-Stabilized Zirconia Coatings: New Insights from
Published: 2/11/2009
Authors: Y Li, W Chi, S Sampath, A N Goland, H Herman, Andrew John Allen, J Ilavsky
Abstract: A multi-component microstructure model is applied in ultrasmall-angle X-ray scattering (USAXS) studies of the processing microstructure property relationships for two groups of plasma-sprayed yttria-stabilized zirconia (YSZ) thermal barrier coati ...

29. Structural Changes to the Calcium Silicate Hydrate Gel Phase of Hydrated Cement with Age, Drying, and Resaturation
Published: 10/8/2008
Authors: J Thomas, Andrew John Allen, Hamlin M Jennings
Abstract: The effects of partial and complete drying on the internal structure of hydrated cement paste were investigated using small angle neutron scattering (SANS). Each specimen was analyzed in the initial saturated state, in the dried state, and then aga ...

30. In Situ Ultra-Small-Angle X-Ray Scattering Study of the Solution-Mediated Formation and Growth of Nanocrystalline Ceria
Published: 1/16/2008
Authors: Andrew John Allen, Vincent A Hackley, P R Jemian, Jan Ilavsky, J M Raitano, S W Chan
Abstract: A remote-controlled isothermal circulating fluid flow cell is described and results presented for the in situ ultra-small-angle x-ray scattering (USAXS) study of solution-mediated systems and suspensions. The fluid flow prevents settling out of coars ...

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