Browsing Faculté des arts et des sciences – Département de chimie by Author "Pellerin, Christian"
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Azobenzene molecular glasses with tuned glass transition temperatures : from optimal light‐induced motion to self‐erasable gratings
Diggins, Austin; Dawson, Eoin; Kamaliardakani, Mahnaz; Pellerin, Christian; Sabat, Ribal Georges; Lebel, Olivier (Royal Society of Chemistry, 2020-04-01)The rate of photomechanical formation of surface relief gratings (SRG) in thin films of azobenzene materials depends on their glass transition temperature (Tg), with an optimal Tg around 50–60 °C yielding the fastest SRG growth. Herein, the SRG growth ... -
Bridging the gap between the mesoscopic 2D order–order transition and molecular-level reorganization in dot-patterned block copolymer monolayers
Richard-Lacroix, Marie; Borozenko, Kateryna; Pellerin, Christian; Bazuin, Geraldine (American Chemical Society, 2016-11-21)Langmuir–Blodgett (LB) films of amphiphilic block copolymers (BCs) form well-defined nanostructures with long-range order useful, for instance, for nanolithography applications. Nanostructures with a 2D circular micelle (“dot”) morphology are known to ... -
Covalently crosslinked mussel byssus protein-based materials with tunable properties
Byette, Frédéric; Marcotte, Isabelle; Pellerin, Christian (Wiley, 2018-03-01)Mussels’ anchoring threads, named byssus, are collagen-rich fibers with outstanding mechanical properties. Our previous work has shown the possibility of producing a byssus protein hydrolyzate with good film-forming ability, providing a promising new ... -
Effect of hydrogen-bond strength on photoresponsive properties of polymer-azobenzene complexes
Vapaavuori, Jaana; Koskela, Jenni E.; Wang, Xiaoxiao; Ras, Robin H.A.; Priimagi, Arri; Bazuin, Geraldine; Pellerin, Christian (NRC Research Press & Canadian Society for Chemistry, 2020-04-16)Supramolecular complexation between photoresponsive azobenzene chromophores and a photopassive polymer host offers synthetic and design advantages compared with conventional covalent azo-containing polymers. In this context, it is important to understand ... -
Electrospinning of highly crystalline polymers for strongly oriented fibers
Laramée, Arnaud; Lanthier, Catherine; Pellerin, Christian (American Chemical Society, 2020-09-23)Electrospun nanofibers (NFs) often demonstrate an exponential increase in mechanical and other properties at reduced diameters. Molecular orientation emerges as a key parameter for the performance of amorphous and low crystallinity polymers, but ... -
Electrospun materials with high reflectance and polarization contrast for sensing applications in the mid-infrared atmospheric window
Laramée, Arnaud; Roy, Olivier; Pellerin, Christian (American Chemical Society, 2024-06-06)Several applications in remote sensing and thermal management require materials with high reflectivity and polarization contrast in the mid-infrared (MIR) spectral range. However, the existing options often fall short in terms of mechanical properties ... -
Engineered robust hydrophobic/hydrophilic nanofibrous scaffolds with drug-eluting, antioxidant, and antimicrobial capacity
Soleimani, Foad; Pellerin, Christian; Omidfar, Kobra; Bagheri, Reza (American Chemical Society, 2024-05-22)Multifunctional nanofibrous architectures have attracted extensive attention for biomedical applications due to their adjustable and versatile properties. Electrospun fabrics stand out as key building blocks for these structures, yet improving their ... -
Eumelanin : from molecular state to film
Reali, Manuel; Camus, Anthony; Beaulieu, Guillaume; De Angelis, Jordan; Pellerin, Christian; Pezzella, Alessandro; Santato, Clara (American Chemical Society, 2021-02-02)Eumelanin, a macromolecular biopigment, is an attractive candidate for sustainable (green) organic electronics. Establishing structure–property relationships in eumelanin films is an essential step to exploit its technological potential. We report on ... -
Eumelanin for nature-inspired UV-absorption enhancement of plastics
Di Mauro, Eduardo; Camaggi, Matteo; Vandooren, Nils; Bayard, Caleb; De Angelis, Jordan; Pezzella, Alessandro; Baloukas, Bill; Silverwood, Richard; Ajj, Abdellah; Pellerin, Christian; Santato, Clara (Wiley, 2019-02-06)In the human body, the black-brown biopigment eumelanin blocks the harmful ultraviolet (UV) radiation. In the plastics industry, additives are often added to polymers to increase their UV-absorption properties. We herein report an assessment of the ... -
Glass engineering of aminotriazine-based materials with sub-ambient Tg and high kinetic stability
Ali Abbas, Zeinab; Iankovitch, Anna; Jokar, Mahboubeh; Maris, Thierry; Lebel, Olivier; Pellerin, Christian (Royal Society of Chemistry, 2020-06-08)A challenge in glass engineering is the design of molecular glasses combining a high glass kinetic stability (GS) of the amorphous phase with a low (sub‐ambient) glass transition temperature (Tg). Triazine derivatives ... -
Glass versus crystal : a balancing act between competing intermolecular interactions
Laventure, Audrey; Maris, Thierry; Pellerin, Christian; Lebel, Olivier (American Chemical Society, 2017-04-14)Hydrogen (H) bonds can be used either for crystal engineering or for designing compounds capable of forming very stable glassy phases. Herein, a second type of directional noncovalent interaction, π–π stacking, is introduced to establish the interplay ... -
In situ photocontrol of block copolymer morphology during dip-coating of thin films
Vapaavuori, Jaana; Grosrenaud, Josué; Pellerin, Christian; Bazuin, Geraldine (American Chemical Society, 2015-09-28)We demonstrate a unique combination of simultaneous top-down and bottom-up control of the morphology of block copolymer films by application of in situ optical irradiation during dip-coating. A light-addressable and block-selective small molecule, ... -
Influence of supramolecular interaction type on photoresponsive azopolymer complexes : a surface relief grating formation study
Wang, Xin; Vapaavuori, Jaana; Wang, Xiaoxiao; Saba, Ribal Georges; Pellerin, Christian; Bazuin, Geraldine (American Chemical Society, 2016-06-24)The influence of the supramolecular interaction type—hydrogen bonding, proton transfer, and pure ionic bonding—on photoresponsive behavior, particularly surface relief grating (SRG) inscription, has been investigated using a homopolymer with an ambient ... -
Metal–ligand interactions and salt bridges as sacrificial bonds in mussel byssus-derived materials
Byette, Frédéric; Laventure, Audrey; Marcotte, Isabelle; Pellerin, Christian (American Chemical Society, 2016-09-02)The byssus that anchors mussels to solid surfaces is a protein-based material combining strength and toughness as well as a self-healing ability. These exceptional mechanical properties are explained in part by the presence of metal ions forming ... -
Molecular origin of the odd–even effect of macroscopic properties of n-Alkanethiolate self-assembled monolayers : bulk or interface?
Amara, Fadwa Ben; Dionne, Éric R.; Kassir, Sahar; Pellerin, Christian; Badia, Antonella (American Chemical Society, 2020-06-29)Elucidating the influence of the monolayer interface versus bulk on the macroscopic properties (e.g., surface hydrophobicity, charge transport, and electron transfer) of organic self-assembled monolayers (SAMs) chemically anchored to metal surfaces is ... -
Molecular-level photo-orientation insights into macroscopic photo-induced motion in azobenzene-containing polymer complexes
Kamaliardakani, Mahnaz; Vapaavuori, Jaana; Xiaoxiao, Wang; Sabat, Ribal Georges; Bazuin, C. Geraldine; Pellerin, Christian (American Chemical Society, 2021-07-13)As part of continuing efforts to deepen the understanding of photo-induced mass transport in azo-containing polymers, we compared the diffraction efficiency (DE) during surface-relief grating (SRG) inscription, photo-induced molecular orientation (<P2>), ... -
Molecular-level study of photoorientation in hydrogen-bonded azopolymer complexes
Wang, Xiaoxiao; Vapaavuori, Jaana; Bazuin, Geraldine; Pellerin, Christian (American Chemical Society, 2018-01-25)To optimize azobenzene-containing materials for applications such as rewritable waveguides and holographic data storage, it is imperative to understand the effect of the azobenzene structure on the photoresponse of the material. Supramolecular ... -
On the importance of noncrystalline phases in semicrystalline electrospun nanofibers
Soleimani, Foad; Mazaheri, Mozhdeh; Pellerin, Christian; Bagheri, Reza (American Chemical Society, 2021-11-18)Tailoring the properties of electrospun fibers requires a detailed understanding and control of their microstructure. We investigate the structure/property relationships in fabrics of randomly aligned fibers of polylactide, a prevalent biopolymer, ... -
Orientation and partial disentanglement in individual electrospun fibers : diameter dependence and correlation with mechanical properties
Richard-Lacroix, Marie; Pellerin, Christian (American Chemical Society, 2015-06-29)Electrospun fibers are versatile materials that exhibit unusual and tunable properties when studied at the single fiber level, including an exponential increase in modulus with a decreasing diameter toward the nanoscale. Understanding the detailed ... -
Photoactive/passive molecular glass blends : an efficient strategy to optimize azomaterials for surface relief grating inscription
Laventure, Audrey; Bourotte, Jérémie; Vapaavuori, Jaana; Karperien, Lucas; Sabat, Ribal Georges; Lebel, Olivier; Pellerin, Christian (American Chemical Society, 2016-12-15): Irradiation of azomaterials causes various photophysical and photomechanical effects that can be exploited for the preparation of functional materials such as surface relief gratings (SRGs). Herein, we develop and apply an efficient strategy to ...