Publications

Displaying 251 - 275 of 305

Techniques for Measurements in Concentrated Systems

February 1, 2004

Author(s)

Vincent A. Hackley

Concentrated suspensions present a number of technical challenges for characterization and monitoring of the solid phase. Recent developments have provided the means to analyze many concentrated systems directly or at solids loadings more closely

Microstructure and Permittivity of Sintered BaTiO 3 : Influence of Particle Surface Chemistry in an Aqueous Medium

January 1, 2004

Author(s)

S K. Lee, U Paik, Vincent A. Hackley, Y S. Jung, K J. Yoon

The influence of changes in the surface chemistry of colloidal BaTiO 3, due to the dissolution and adsorption/precipitation of Ba in an aqueous medium, on the microstructural development and permittivity of sintered BaTiO 3 powder compacts was investigated

Influence of Barium Dissolution on the Electrokinetic Properties of Colloidal BaTiO 3 in an Aqueous Medium

October 1, 2003

Author(s)

S K. Lee, Vincent A. Hackley, U Paik

Hystersis in the electrokinetic behavior of hydrothermally synthesized colloidal BaTiO 3 is observed during sequential acid and base titrations. Ba 2+ dissolved during the acid titration results in a Ba-depleted oxide-rich surface. As the acid treated

Characterization of Chinese Ink in Size and Surface

July 1, 2003

Author(s)

J R. Swider, Vincent A. Hackley, J Winter

Chinese lnk, a mixture of soot and animal glue, has been used in East Asia for centuries as the sole black paint of choice. The combination of animal glue and soot particles creates a distinctive dispersion system giving Chinese Ink its unique properties

Influence of [Ba+Ca]/[Ti+Zr] Ratio on the Interfacial Property of (Ba, Ca)(Ti, Zr)O 3 (BCTZ) Powders in an Aqueous Medium

June 3, 2003

Author(s)

James Lee, S K. Lee, Vincent A. Hackley, U Paik

We report on findings of the electrokinetic and solubility behavior of BCTZ powders having three different [Ba+Ca]/[Ti+Zr] ratios: 0.995, 1.000, and 1.005. Ba and Ca ions, occupying primarily A-sites on the perovskite lattice, dissolve during acid

Effect of Poly(Acrylic Acid) and Poly(Vinyl Alcohol) on the Solubility of Colloidal BaTiO 3 in an Aqueous Medium

May 1, 2003

Author(s)

S K. Lee, J. H. Lee, Vincent A. Hackley, U Paik

The influence of poly (acrylic acid) PAA) and poly(vinyl alcohol) PVA) on Ba dissolution at the BaTiO 3-aqueous solution interface was investigated. Incongruent dissolution of Ba impacts the colloidal stability, microstructure and electrical properties of

Analysis of the ASTM Round-Robin Test on Particle Size Distribution of Portland Cement: Phase II

December 1, 2002

Author(s)

Chiara F. Ferraris, Vincent A. Hackley, A Aviles, C E. Buchanan

Particle size distribution (PSD) is an essential property of cement. The only standard method to measure the PSD of cement, namely ASTM C115 [ ] is limited in scope; this standard describes a method for determining fineness with a lower size detection

Analysis of the Isoelectric Point in Moderately Concentrated Alumina Suspensions Using Electroacoustic and Streaming Potential Methods

November 1, 2002

Author(s)

Vincent A. Hackley, J Patton, Lin-Sien H. Lum, R Wasche, H Abe, M Naito, Y Hotta, H Pendse

Alumina suspended in aqueous electrolytic solution was used as a model ceramic suspension to investigate the measurement precision and influencing factors for the determination of the isoelectric point (IEP) in moderately concentrated systems. Techniques

Analysis of the ASTM Round-Robin Test on Particle Size Distribution of Portland Cement: Phase I

May 1, 2002

Author(s)

Chiara F. Ferraris, Vincent A. Hackley, A Aviles, C E. Buchanan

Particle size distribution (PSD) is an essential property of cement. The only standard method to measure the PSD of cement, namely ASTM C115, is limited in scope; this standard describes a method for determining fineness with a lower size detection limit

Experimental Study on Zeta Potential and Streaming Potential of Advanced Ceramic Powders

March 1, 2002

Author(s)

R Wasche, M Naito, Vincent A. Hackley

Experimental evidence has been given for the comparison of zeta potential as measured with the electrokinetic sonic amplitude (ESA) method and streaming potential as measured with the particle charge detection (PCD) method. The measurements have been

Dissolution and Reprecipitation of Barium at the Particulate BaTiO 3 -Aqueous Solution Interface

January 1, 2002

Author(s)

U Paik, M Lee, Vincent A. Hackley, Y S. Jung

The electrolinetic behavior of BaTO 3 particles in an aqueous medium exhibit a hysteresis loop with titration direction. As BaTiO 3 suspension was titrated toward acidic pH, the amount of Ba 2+ dissolution strongly increases, and in the subsequent

Measuring the Isoelectric Point of Ceramic Powder Suspennsions: A Pre-Standarization Study

January 1, 2002

Author(s)

M Naito, Vincent A. Hackley, R Wasche

The isoelectric point (IEP) is a key material property for aqueous-based processing of advanced ceramic powders. The IEP characterizes the acid-base behavior of the powder surface, which in turn influences powder dispersion and chemical interactions at the

Modification of Electrokinetic Behavior of CeO 2 Abrasive Particles in Chemical Mechanical Polishing for Shallow Trench Isolation

December 1, 2001

Author(s)

J P. Kim, J G. Yeo, U Paik, Y S. Jung, Jinkyoo Park, Vincent A. Hackley

Ceria (CeO 2) slurry stability and oxide-to nitride selectivity in the shallow trench isolation chemical mechanical polishing (STI CMP) process were manipulated with the modification of ceria surface potentials. The electrophoretic mobility of CeO 2

Search Publications by: Dr. Vincent A. Hackley (Assoc)