Circulation des connaissances : modèle et stratégies

This article presents a knowledge circulation model developed by Groupe de recherche Médias et santé (GRMS) of Université du Québec à Montréal (UQAM), through various strategies of knowledge mobilization. Beyond its mission of research, the GRMS aims to create bridges between researchers and stakeholders interested in health communication and coming from various domains (health, media and research) to encourage knowledge utilization

Circulation des connaissances : modèle et stratégies

Cet article présente le modèle de circulation des connaissances développé par le Groupe de recherche Médias et santé (GRMS) de l’Université du Québec à Montréal (UQAM), à travers différentes stratégies de mobilisation des connaissances. Au-delà de sa mission première de recherche, le groupe s’est donné comme objectif de faire se rencontrer différents intervenants (issus du monde de la santé, des médias et de la recherche) intéressés par les communications médiatiques en matière de santé. Cet article expose le modèle, les stratégies et moyens mis en œuvre pour encourager l’utilisation des connaissances dans les différents milieux.This article presents a knowledge circulation model developed by Groupe de recherche Médias et santé (GRMS) of Université du Québec à Montréal (UQAM), through various strategies of knowledge mobilization. Beyond its mission of research, the GRMS aims to create bridges between researchers and stakeholders interested in health communication and coming from various domains (health, media and research) to encourage knowledge utilization

Synthesis of dense arrays of multiferroic CoFe2O4–PbZr0.52Ti0.48O3 core/shell nanocables

A major challenge in the development of efficient magnetoelectric nanocomposites is the adequate control of the interfaces, in order to avoid the formation of undesirable interphases and to ensure an optimal strain mediated coupling. In this work we used a combination of low-cost impregnation and electrodeposition processes within the ordered nanochannels of a porous anodic alumina template, to elaborate CoFe2O4–PbZr0.52Ti0.48O3 core/shell nanocable arrays with high interfacial areas between the ferroelectric and the magnetic phases. We have shown in this way that the thermal annealing steps required for phase's crystallization and oxidation of metallic CoFe2 into spinel CoFe2O4 are critical with respect to interdiffusion phenomena through the interfaces. The impact of the processing temperature on the morphological and structural features of the nanocables was then discussed. We demonstrated that an optimization of process variables in the synthesis of CoFe2O4–PbZr0.52Ti0.48O3 nanocables allows a significant improvement in their microstructure and ensures the chemical integrity of the two-phase materials, an important concern when seeking for enhanced multiferroic properties

Some strategies to (co)-sinter refractory functional oxides at low temperature by Spark Plasma Sintering

International audienc

Some strategies to (co)-sinter refractory functional oxides at low temperature by Spark Plasma Sintering

International audienc

Interface investigation in nanostructured BaTiO3/Silica composite ceramics

Silica-coated ferroelectric particles are promising building blocks for functional bulk composites such as dielectric resonators, supercapacitors, or multiferroics. The ferroelectric/silica interface was fully investigated by means of high-temperature in situ X-ray diffraction, high-resolution scanning electron microscopy, and X-ray photoelectron spectroscopy. Mechanisms occurring at the interface were visualized using high-resolution postmortem and in situ transmission electron microscopy performed at different temperatures. On the light of this interface investigation, we have used advanced sintering processes such as spark plasma sintering and microwave sintering to obtain nanostructured composite ceramics and to evaluate their dielectric properties

Synthesis and magnetic properties of Ni–BaTiO3 nanocable arrays within ordered anodic alumina templates

A reliable and flexible synthesis route was used for processing high density Ni–BaTiO3 nanocable arrays based on wet chemical impregnation and subsequent electrodeposition within a highly ordered unidirectional porous alumina membrane. The core–shell structure was carefully investigated by bright field scanning transmission electronic microscopy coupled with energy dispersive X-ray spectroscopy. The strength of the dipolar interaction arising from the packing density of the magnetic nanowires was correlated with the BaTiO3 wall thickness through magnetometry and ferromagnetic resonance measurements. Our approach opens a pathway to obtain optimized nanostructured multiferroic composites exhibiting tunable magnetic properties

Interface investigation in nanostructured BaTiO₃/silica composite ceramics

International audienceSilica-coated ferroelectric particles are promising building blocks for functional bulk composites such as dielectric resonators, supercapacitors, or multiferroics. The ferroelectric/silica interface was fully investigated by means of high-temperature in situ X-ray diffraction, high-resolution scanning electron microscopy, and X-ray photoelectron spectroscopy. Mechanisms occurring at the interface were visualized using high-resolution postmortem and in situ transmission electron microscopy performed at different temperatures. On the light of this interface investigation, we have used advanced sintering processes such as spark plasma sintering and microwave sintering to obtain nanostructured composite ceramics and to evaluate their dielectric properties