Parcourir Faculté des arts et des sciences – Département de chimie par auteur·e "Vapaavuori, Jaana"
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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 ... -
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 ... -
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 ... -
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 ... -
Photocontrol of supramolecular azo-containing block copolymer thin films during dip-coating : toward nanoscale patterned coatings
Vapaavuori, Jaana; Grosrenaud, Josué; Siiskonen, Antti; Pellerin, Christian; Bazuin, Geraldine (American Chemical Society, 2019-05-07)Dip-coating allows nanostructured block copolymer (BCP) thin film fabrication in a fast and facile one-step process. It can also be coupled with external controls, such as illumination. Herein, we expose several design principles that enable photocontrol ... -
Probing interfacial interactions and dynamics of polymers enclosed in boron nitride nanotubes
Niskanen, Jukka; Xue, Yanming; Golberg, Dmitri; Winnik, Françoise M.; Pellerin, Christian; Vapaavuori, Jaana (Wiley, 2021-11-23)Understanding interfacial interactions in polymer systems is crucial for their applicability for instance in adhesives and coatings. Enclosing polymers in a cylindrical volume provides a system for studying interactions dictated by a continuous ... -
Taming macromolecules with light : lessons learned from vibrational spectroscopy
Vapaavuori, Jaana; Bazuin, Geraldine; Pellerin, Christian (Wiley, 2017-09-12)Exciting new applications, from large-area nanopatterning and templating to soft light-powered robotics, are emerging from the fundamental research on light-triggered changes in macromolecular systems upon photoisomeriza-tion of azobenzene-based molecular ...