Paul Roumeliotis

Powder Aging Effects on Mechanical and Fire Properties of a Flame Retardant PA12 in Laser Powder Bed Fusion

Paul Roumeliotis, Samuel Schlicht, Rainer Detsch, Qaisar Nawaz et autres

Flame retardant polymer based powders for laser based powder bed fusion (PBF-LB/P) are currently not reusable. This leads to crucial economic and environmental disadvantages of the process, when using flame retardant powder. In this study, we demonstrate the processability and emerging part …

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Silane-based particle-matrix coupling in intumescent flame retardant systems for PBF-LB/P

Paul Roumeliotis, Samuel Schlicht, Rainer Detsch, Qaisar Nawaz et autres

Flame retardancy for samples manufactured in laser-based powder bed fusion (PBF-LB/P) is one of the major concerns to overcome for the application of the materials in environments with high safety standards. However, the trade-off between flame retardant and mechanical properties remains challenging. …

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Unravelling the Impact of the Ionomer on the Degradation Mechanisms in Carbon-Supported Platinum Electrocatalysts: On the Path Toward Durable Proton Exchange Membrane Fuel Cells

Timo Imhof, Roberta Karla Francesca Della Bella, Paul Paciok, Pascal Lauf et autres

The performance and durability of carbon-supported platinum (Pt/C) electrocatalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFC) are strongly influenced by the characteristics of the carbon support, resulting in different ionomer-catalyst interactions. Our study examines how the …

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Ammonium polyphosphate and pentaerythritol as a flame-retardant system for polyamide 12 in selective laser sintering

Paul Roumeliotis, Dietmar Drummer

Abstract This study investigates the incorporation of an intumescent flame-retardant system, based on a intumescent combination of ammonium polyphosphate (APP) and pentaerythritol (PER), into polyamide 12 (PA12) for selective laser sintering (SLS). The influence of processing parameters and filler content on the …

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Intumescent, catalyzed flame retardant systems for polyamide‐based powder bed fusion

Paul Roumeliotis, Samuel Schlicht, Dietmar Drummer

Abstract Flame‐retardant properties of polymer components are essential to a broad variety of applications. However, the processing of flame‐retardant thermoplastics in laser‐based powder bed fusion remains challenging. To overcome prevailing limitations, a new polyphosphate‐based intumescent flame‐retardant system for polyamide 12 (PA12) based …

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Silane-Based Particle-Matrix Coupling in Intumescent Flame Retardant Systems for Pbf-Lb/P

Paul Roumeliotis, Samuel Schlicht, Rainer Detsch, Qaisar Nawaz et autres

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Controlled Dripping Behavior of Polymer Samples: Anti Dripping Agents in Powder Bed Fusion

Paul Roumeliotis, Dietmar Drummer

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A future-forward influenza immunization model of care for high-risk patients in pharmacies: A Canadian consensus

Aaron Sihota, Cameron Bonell, Brittany Buffone, Sherilyn K. D. Houle et autres

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Co-Administration of Influenza and COVID-19 Vaccines: A Cross-Sectional Survey of Canadian Adults’ Knowledge, Attitudes, and Beliefs

Sherilyn K. D. Houle, Ajit Johal, Paul Roumeliotis, Bertrand Le Roy et autres

Vaccination rates against both influenza and COVID-19 fall short of targets, especially among persons at risk of influenza complications. To gain insights into strategies to boost influenza vaccine coverage, we surveyed 3000 Canadian residents aged ≥ 18 years and examined their knowledge …

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Influenza vaccination in community pharmacy: A cross-sectional survey of Canadian adults’ knowledge, attitude and beliefs

Sherilyn K. D. Houle, Ajit Johal, Paul Roumeliotis, Bertrand Le Roy et autres

Background: In Canada, influenza vaccination rates are below recommended targets, with pharmacies the leading setting for vaccine administration. This work aimed to determine the Canadian public's current knowledge, attitudes and practices related to pharmacy-based influenza vaccination services. Methods: We surveyed 3000 Canadian …

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Knowledge, Perceptions, and Self-Reported Rates of Influenza Immunization among Canadians at High Risk from Influenza: A Cross-Sectional Survey

Paul Roumeliotis, Sherilyn K. D. Houle, Ajit Johal, Bertrand Le Roy et autres

The Public Health Agency of Canada recommends that 80% of high-risk persons, including adults aged ≥65 years and 18-64 years with certain comorbidities, be vaccinated against influenza. During the 2022-2023 influenza season, we conducted an online survey of 3000 Canadian residents aged …

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Controlled doping of carbon catalyst supports by atomic replacement via gasification-assisted heteroatom doping

Felix Herold, Timo Imhof, Paul Roumeliotis, Patrick Schühle et autres

Due to a set of unique properties, carbon materials are applied as supports for metal-based catalysts in a wide variety of established and emerging (electro-)catalytical transformations. By introducing heteroatoms such as N, S and P into carbon supports, metal-support interactions can be …

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