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Paul Bowen

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Publications associées (94)

Grain Growth in Doped Oxide Ceramics: From Nanosizes Powders and Atomistic Simulations to Tailored Interfaces

Paul Bowen, Ulrich Aschauer, Sandra Caroline Galmarini

Swansea Materials Research Centre2006

Precipitation of Nanostructured Copper Oxalate: Substructure and Growth Mechanism

Paul Bowen, Heinrich Hofmann, Jacques Lemaître, Lucica Soare

The possibility of controlling materials properties by tailoring their substructure at the nanometer scale is a current topic of great interest. To do so, a fundamental understanding of the growth mechanism is of key importance and an analytical challenge ...

2006

Formation and Drying of Colloidal Crystals Using Nanosized Silica Particles

Paul Bowen, Heinrich Hofmann, Frédéric Juillerat

Much interest has been generated in the fabrication of colloidal crystals from suspensions because of the promise of photonic band gap applications. However, since the case of small, nonsedimenting colloidal particles indeed remains rather rarely treated, ...

2006

Yodel: A Yield Stress Model for Suspensions

Paul Bowen

A model for the yield stress of particulate suspensions is presented that incorporates microstructural parameters taking into account volume fraction of solids, particle size, particle size distribution, maximum packing, percolation threshold, and interpar ...

2006

Towards tailored superplasticizers

Paul Bowen, Yves Houst, François Perche

Superplasticizers (SP) of the “new generation” are essentially polycarboxylate polymers. Polymers of this family can be produced with almost infinite variations in their chemical structure, which allow the fulfilment of specific (tailored) properties. Thes ...

2005

Colloidal processing and sintering of nanosized transition aluminas

Paul Bowen, Heinrich Hofmann, Claude Paul Carry, David Luxembourg

The dispersion of nanosized gamma aluminas with high specific surfaces areas (100 m2 /g) and primary particle sizes around 20 nm, using polyacrylic acid, has been investigated. The effect of pH and polymer concentration showed that the highest density gree ...

2005

Photocatalytic Storing of O2 as H2O2 Mediated by High Surface Area CuO. Evidence for a Reductive-Oxidative Interfacial Mechanism

Paul Bowen, Juan Kiwi, Lucica Soare

CuO powders with a high specific surface area are shown to be able to produce H2O2 in aqueous solution under simulated light irradiation. The highest rate of peroxide production was observed under mild experimental conditions using O2 and a large surface a ...

2005

Fabrication of large-area ordered arrays of nanoparticles on patterned substrates

Paul Bowen, Heinrich Hofmann, Frédéric Juillerat

Many potential applications in nanotechnology require virtually defect-free arrays of nanometre-scale particles over large areas. Guided self-assembly of colloidal particles on patterned templates has been shown to produce ordered arrays of colloidal parti ...

2005

The influence of Ti02 physico chemical characteristics in photocatalytic water disinfection

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

2005

Phase Transformation and Densification of Nanostructured Alumina. Effect of Seeding and Doping

Paul Bowen, Claude Paul Carry

By following the densification kinetics of nanocrystalline γ alumina and corresponding microstructural evolution we showed that the diffusive transformation gamma-alpha involves several processes such as nucleation of alpha phase, rearrangement of gamma cr ...

2005

Use of seeds to control precipitation of calcium carbonate and determination of seed nature

Marcel Donnet, Nathalie Jongen, Paul Bowen, Heinrich Hofmann, Jacques Lemaître

2005

Aggregation and Charging of Colloidal Silica Particles: Effect of Particle Size

Paul Bowen, Frédéric Juillerat, Michal Borkovec

We studied systematically aqueous suspensions of amorphous well-characterized silica particles by potentiometric titration, electrophoretic mobility, and time-resolved light scattering. Their charging behavior and aggregation rate constants were measured a ...

2005

High quality nickel manganese oxalate powders synthetized in a new segmented flow tubular reactor

Marcel Donnet, Nathalie Jongen, Paul Bowen, Jacques Lemaître

2004

Development of a continuous segmented flow tubular reactor and the " scale-out" concept - In search of perfect powders

Marcel Donnet, Nathalie Jongen, Paul Bowen, Heinrich Hofmann, Jacques Lemaître, Marco Viviani, Andrea Testino

2003

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