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Paul Bowen

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Publications associées (94)

Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold

Paul Bowen, Alexander Wokaun, Andrea Testino, Mohammad Reza Andalibi

An overarching computational framework unifying several optical theories to describe the temporal evolution of gold nanoparticles (GNPs) during a seeded growth process is presented. To achieve this, we used the inexpensive and widely available optical exti ...

2019

Rapid evaluation of bioactive Ti-based surfaces using an in vitro titration method

Paul Bowen, Jacques Lemaître, Weitian Zhao

The prediction of implant behavior in vivo by the use of easy-to-perform in vitro methods is of great interest in biomaterials research. Simulated body fluids (SBFs) have been proposed and widely used to evaluate the bone-bonding ability of implant materia ...

Springer2019

Recent advances in nano-bio-interactions: Editorial

Paul Bowen, Alke Fink, Sami Rtimi

ELSEVIER SCIENCE BV2019

An atomistic building block description of C-S-H - Towards a realistic C-S-H model

Paul Bowen, Sandra Caroline Galmarini, Aslam Kunhi Mohamed

Pergamon-Elsevier Science Ltd2018

On the mesoscale mechanism of synthetic calcium–silicate–hydrate precipitation: a population balance modeling approach

Paul Bowen, Karen Scrivener, Andrea Testino, Christian Ludwig, Abhishek Kumar, Mohammad Reza Andalibi, Bhuvanesh Srinivasan

Royal Society of Chemistry2018

Synthesis and characterization of fluorinated anatase nanoparticles and subsequent N-doping for efficient visible light activated photocatalysis

Paul Bowen, Sami Rtimi

Fluorinated-titanium dioxide (TiO2-F) nanoparticles in a pure anatase polymorph was precipitated from solution by hydrolysis of titanium oxychloride, using urea and ammonia as precipitation agents and potassium fluoride as a source of fluorine anion. A fur ...

2018

Thermal stability of nanometric TiC-carbon composites: effects of carbon allotropes and Zr milling impurities

Paul Bowen

In the ISOL (Isotope Separator OnLine) method a target at high temperatures (up to 2300 degrees C), is bombarded with high energy protons in order to produce isotopes through nuclear reactions which are simultaneously extracted from the target, ionized and ...

2018

Nanoparticles and method for producing uniform silicate-based nanoparticles

Paul Bowen, Abhishek Kumar

Nanoparticles and method for producing uniform silicate-based nanoparticles are disclosed. The method comprises a step of injecting into tubular branched elements comprising static mixers a first aqueous solution comprising a water-soluble silicate compoun ...

2018

Interaction of biologically relevant ions and organic molecules with titanium oxide (rutile) surfaces: A review on molecular dynamics studies

Paul Bowen, Ulrich Aschauer, Azade Yazdan Yar

The surface of a biomaterial can play a major role in its biological fate since the surface is the primary pathway for its interaction with the body. As the natural response of the body to a foreign material is to encapsulate it with a fibrous material, th ...

2018

Adsorption Free Energy of Single Amino Acids at the Rutile (110)/ Water Interface Studied by Well-Tempered Metadynamics

Paul Bowen, Ulrich Aschauer, Azade Yazdan Yar

Single amino acids are present in blood plasma and are the building blocks of larger organic residues. Their interaction with surfaces is therefore crucial for biomedical applications in contact with blood. In this work, we use well-tempered metadynamics t ...

2018

Hardening acceleration/hardening retardation composition for building materials

Paul Bowen, Abhishek Kumar

Provided herein is a composition for use as a hardening regulator, e.g. hardening accelerator or hardening retarder, for building materials, as well as methods for producing thereof. The composition is characterized by a biphasic nature in which solid calc ...

2018

Non-invasive continuous monitoring of pro-oxidant effects of engineered nanoparticles on aquatic microorganisms

Paul Bowen, Christian Santschi, Olivier Martin, Volodymyr Koman, Nadia Rachel Von Moos

Engineered nanomaterials (ENMs) are key drivers for the development of highly sophisticated new technologies. As all new attainments, the rapidly increasing used of ENMs raise concerns about their safety for the environment and humans. There is growing evi ...

2017

The Atomic-Level Structure of Cementitious Calcium Silicate Hydrate

Paul Bowen, Karen Scrivener, Aslam Kunhi Mohamed, Abhishek Kumar, David Lyndon Emsley, Aaron James Rossini, Albert Hofstetter, Bhuvanesh Srinivasan, Brennan James Walder

Efforts to tune the bulk physical properties of concrete are hindered by a lack of knowledge related to the atomic-level structure and growth of calcium silicate hydrate phases, which form about 50-60% by volume of cement paste. Here we describe the first ...

2017

A comparative study of simulated body fluids in the presence of proteins

Paul Bowen, Jacques Lemaître, Weitian Zhao

Simulated body fluid (SBF) is widely used as part of an in vitro method to evaluate implant materials such as their apatite forming ability (AFA), a typical indication of potential bone-bonding ability in vivo. We report the use of carbonate-buffered SBFs ...

2017

Development of a processing route for carbon allotrope-based TiC porous nanocomposites

Paul Bowen

Ti-foils are currently used as a spallation target material to produce radioisotopes for physics research at the ISOLDE facility at CERN. However, radioisotope production rates often decrease over time due to material degradation from high operation temper ...

2017

Synergistic Effect of Fluorinated and N Doped TiO2 Nanoparticles Leading to Different Microstructure and Enhanced Photocatalytic Bacterial Inactivation

Paul Bowen, Brigitte Greenwood, Sami Rtimi, Amarnath Jayaprakash

This work focuses on the development of a facile and scalable wet milling method followed by heat treatment to prepare fluorinated and/or N-doped TiO2 nanopowders with improved photocatalytic properties under visible light. The structural and electronic pr ...

2017

Synthesis and Sintering of ZnO Nanopowders

Paul Bowen, Michael Stuer, Zhe Zhao

Nanopowders are continuously under investigation as they open new perspectives in numerous fields. There are two main challenges to stimulating their development: sufficient low-cost, high throughput synthesis methods which lead to a production with well-d ...

Mdpi Ag2017

Plasma blob studies using a fluorescent probe

Paul Bowen, Ambrogio Fasoli, Ivo Furno, Carlos Morais, Paolo Ricci, Oulfa Chellaï, Weitian Zhao, Marcelo Baquero Ruiz, Fabian Manke

2017

A discussion on the paper "Role of porosity on the stiffness and stability of (001) surface of the nanogranular C-S-H gel"

Paul Bowen, Aslam Kunhi Mohamed

This paper is a discussion of a recent publication by Sekkal and coworkers, which investigated the elasticity, cohesion, and stability of the C-S-H (001) surface as a function of porosity using molecular dynamics simulations. In our discussion, we highligh ...

Pergamon-Elsevier Science Ltd2017

Thermodynamic-Kinetic Precipitation Modeling. A Case Study: The Amorphous Calcium Carbonate (ACC) Precipitation Pathway Unravelled

Paul Bowen, Andrea Testino, Christian Ludwig, Frank Pilger, Agnese Carino, Mohammad Reza Andalibi

Nine accurate experimental data sets on amorphous calcium carbonate (ACC) formation in dilute solution were collected varying temperature and pH. The entire precipitation process is described using a complete thermodynamic-kinetic model. The thermodynamic ...

American Chemical Society2017

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