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Paul Bowen

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Publications associées (94)

Freeze granulation: Powder processing for transparent alumina applications

Paul Bowen, Michael Stuer, Zhe Zhao

Use of freeze granulated powders is successfully used as an industrially viable alternative to loose powder sintering for transparent polycrystalline alumina (PCA). Freeze granulation with narrow granule size distribution was realized after suspension cond ...

2012

Symposium on Transparent Ceramics

Paul Bowen, Zhe Zhao

2012

Atomistic modeling of dopant segregation in alpha-alumina ceramics: Coverage dependent energy of segregation and nominal dopant solubility

Paul Bowen, Ulrich Aschauer, Sandra Caroline Galmarini, Yann Aman, Abhishek Tewari

Microstructural control is a key aspect in producing ceramics with tailored properties and is often achieved by using dopants in a rather empirical fashion. Atomic scale simulations could provide much needed insight but the long-standing challenge of linki ...

2011

Control of morphology and nanostructure of copper and cobalt oxalates: Effect of complexing ions, polymeric additives and molecular weight

Nathalie Jongen, Paul Bowen, Heinrich Hofmann, Jacques Lemaître, Alke Fink

Precipitated oxalates are often nanostructured and can be used as precursors for nanostructured oxides for different applications. The modification of the particle shape and nanostructures of both copper and cobalt oxalates has been demonstrated using poly ...

2010

Fabrication and Characterisation of Cathode Support-tubes for Micro-tubular SOFC Application

Stefan Diethelm, Paul Bowen, Heinrich Hofmann, Jan Van Herle, John Espen Rossen

Tubes of diameter

2009

Electron-microscopic observation of BaTiO3 prepared by additive assisted aqueous synthesis

Paul Bowen

Cambridge, Cambridge University Press2009

Cathode-supported micro-tubular SOFCs based on Nd1.95NiO4 + δ: Fabrication and characterisation of dip-coated electrolyte layers

Paul Bowen, Heinrich Hofmann, Jan Van Herle, Ulrich Aschauer, Josef Andreas Schuler, Henning Lübbe

Fabrication conditions to obtain dense electrolyte double layers on a porous micro-tubular cathode substrate were investigated. Porous tubes of a nickelate material, Nd1.95NiO4 + δ, were fabricated by cold-isostatic pressing (CIP) and sintering. Thin ﬁlms ...

2009

Growth modification of hematite by phosphonate additives

Paul Bowen, Heinrich Hofmann, Ulrich Aschauer

The hydroxylated surface structures of seven morphologically important crystallographic surfaces of hematite were calculated allowing the determination of the surface energies and, consequently,the hematite equilibrium morphology. The docking of two organi ...

2008

Surface and Mirror Twin Grain Boundary Segregation in Nd:YAG: An Atomistic Simulation Study

Paul Bowen, Ulrich Aschauer

Ceramic lasers have advantages such as better optical homogeneity, cheaper production, and more freedom in shape compared with monocrystalline lasers. However, equal or better laser performances are required. Interface segregation is important as ceramics ...

2008

Design and Function of Novel Superplasticizers for More Durable High Performance Concrete (Superplast Project)

Paul Bowen, Yves Houst, François Perche

In this article we shall describe our quest and ultimate success in furthering our understanding of the action of superplasticizers on the rheology of cement and concrete. By specifically producing superplasticizers with varied architectures, we have been ...

Pergamon-Elsevier Science Ltd2008

Atomistic Simulation of Y-Doped alpha-Alumina Interfaces

Paul Bowen, Ulrich Aschauer, Sandra Caroline Galmarini

The exact mechanism of creep resistance enhancement due to yttrium (Y) doping in a-alumina is still subject to speculation, although it is known that dopants segregate strongly to grain boundaries. The current work applies atomistic simulation techniques t ...

2008

Effect of particle size on LiMnPO4 cathodes

Paul Bowen, Nam Hee Kwon

LiMnPO4 was synthesized using a sol–gel method and tested as a cathode material for lithium ion batteries. After calcination at temperatures between 520 and 600 ◦C, primary particle sizes in the range of 140–220 nm were achieved. Subsequent dry ball millin ...

2007

Adsorption of Superplasticizers on a Model Powder

Paul Bowen, Yves Houst, François Perche

Adsorption isotherms of carboxylate type superplasticizers with different architectures have been measured on MgO considered as a non-reactive model powder. This system allowed us to study the influence of pH, electrolyte type, concentration and ionic stre ...

Conseil national de recherches du Canada2007

Phosphorescent compounds

Paul Bowen

Phosphorescent composition comprises an alkaline earth metal silicate doped with europium fluoride and another lanthanide fluoride. Independent claims are also included for: (1) producing a composition as above by grinding a mixture of alkaline earth metal ...

2007

Improved superplasticisers for high performance concrete: the SUPERPLAST project

Paul Bowen, Yves Houst, François Perche

Conseil national de recherches du Canada2007

Yield Stress of Multimodal Powder Suspensions: An Extension of the YODEL (Yield Stress mODEL)

Paul Bowen

The prediction of the rheological properties of concentrated suspensions is of great importance both in industrial processes (ceramics, cements, and pharmaceutics) and natural phenomena (debris flow, soil erosion). In a previous paper, we presented a new m ...

2007

Impact of small amounts of swelling clays on the physical properties of debris-flow-like granular materials. Implications for the study of alpine debris flow

Eric Bardou, Paul Bowen, Pascal Boivin

The effect of the small fraction of clays on the rheological behaviour of alpine debris flow is poorly understood. This is partly due to the complexity of the debris flow mineralogy and the broad particle size distribution. This study has investigated this ...

2007

Catalytic activity of commercial of TiO2 powders for the abatement of the bacteria (E. coli) under solar simulated light: Influence of the isoelectric point

Paul Bowen, Juan Kiwi, César Pulgarin, Damien Gumy, Carlos Morais, Rita Hajdu Schenk

Thirteen different commercial TiO2 powders with specific surface areas varying from 9 to 335 m/g and with isoelectric points (IEP) from 3 to 7.5 were investigated for their catalytic activity in E. coli inactivation. The TiO2 samples zeta potential, attenu ...

2006

A thermodynamic model for the precipitation of nanostructured copper oxalates

Paul Bowen, Heinrich Hofmann, Jacques Lemaître, Lucica Soare

A thermodynamic model is developed for the precipitation of copper oxalate from aqueous solutions of copper nitrate and sodium oxalate in a small well-mixed batch reactor. This model is then used to explain the discrepancy between experimental pH evolution ...

2006

Atomistic Modeling Study of Surface Segregation in Nd:YAG

Paul Bowen, Ulrich Aschauer

This study investigates the composition of free surfaces of neodymium-doped yttrium–aluminum–garnet, using energy minimization techniques. Atomistic modeling shows that the dopant is concentrated in a zone within 0.5 nm ̊of the surface, the enrichment fact ...

2006

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