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Polypeptide-based vapor-responsive porous poly(ionic liquid) actuators: From reversible to unexpectedly irreversible actuation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3334-9076
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Number of Authors: 82023 (English)In: Materials Today Communications, ISSN 2352-4928, Vol. 35, article id 105878Article in journal (Refereed) Published
Abstract [en]

Soft actuators capable of large and swift locomotion in combination with biocompatibility hold great potential in medicine and healthcare applications. In this contribution, a polypeptide-type poly(ionic liquid) (termed “PLL-PMIM-Tf2N”) was designed and synthesized by post-polymerization modification of poly-L-lysine; Next, via controlled electrostatic complexation with poly(acrylic acid) (PAA) or poly(L-glutamic acid) (PLG), porous membrane actuators termed PLL-PMIM-Tf2N/PAA or PLL-PMIM-Tf2N/PLG, respectively, were tailor-made. Hemolytic tests support excellent blood cell compatibility of the fully polypeptide-based PLL-PMIM-Tf2N/PLG actuator. The as-made soft actuators could bend significantly up to 500°with a maximum curvature of 7 cm−1 in response to solvent vapor in a fast actuation process within 2 s. Their high sensitivity towards solvent molecules equips them with skills to distinguish solvent isomers, as exemplified by butanol isomers, in terms of bending curvature due to varied molecular interactions between the actuator and the isomer. To be highlighted is an unusual irreversible actuated tubular state of the fully polypeptide-based PLL-PMIM-Tf2N/PLG actuator that is stable in shape and resembles bionic blood vessels. Such polypeptide-type poly(ionic liquid) actuators are of significant value in future development of biocompatible devices for medical and healthcare applications.

Place, publisher, year, edition, pages
2023. Vol. 35, article id 105878
Keywords [en]
Soft actuators, Polypeptide, Solvent vapor, Bionic blood vessel, Poly(ionic liquid)
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:su:diva-219279DOI: 10.1016/j.mtcomm.2023.105878Scopus ID: 2-s2.0-85151471603OAI: oai:DiVA.org:su-219279DiVA, id: diva2:1783461
Funder
EU, European Research Council, PARIS-101043485Stockholm UniversityAvailable from: 2023-07-21 Created: 2023-07-21 Last updated: 2023-12-17Bibliographically approved
In thesis
1. Stimuli-Responsive Materials Derived from Cellulose Nanofibrils: Synthesis, characterization, and performance evaluation
Open this publication in new window or tab >>Stimuli-Responsive Materials Derived from Cellulose Nanofibrils: Synthesis, characterization, and performance evaluation
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents a comprehensive study on stimuli-responsive materials derived from cellulose nanofibrils (CNFs), focusing on their synthesis, characterization, and performance evaluation in various applications. Renowned for their biodegradability, renewability, and robust mechanical properties, CNFs are explored in three primary contexts: moisture-responsive actuators, voltage-responsive actuators, and CO2-responsive sensors.

The unique properties of CNFs, such as high tensile strength and surface area, are leveraged to achieve effective motion in response to moisture exposure. Specifically, CNFs are utilized to create bilayer, torsional, and tensile actuators. These actuators exhibit controllable and dynamic responses, making them suitable for applications in soft robotics and wearable technology.

In the realm of voltage-responsive actuators, this study investigates the impact of various electrolytes and counteranions on positively charged CNFs. It uncovers the critical role of electrolyte choice, ion migration and the plasticization effect within the CNFs matrix, resulting in volumetric expansion, which is pivotal to the actuation mechanism. These insights pave the way for CNFs applications requiring precise control of motion and flexibility in shape, such as in soft robotics.

The third area of application involves the development of a capacitive CO2 sensor using CNFs-based foams functionalized with primary amines to enhance CO2 capture through chemisorption. This functionalization turns the CNFs-based foam into an efficient dielectric layer (DE) for sensor applications. The addition of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) to the DE further expands the scope of sensor's capacitance change in response to CO2 exposure, underscoring its potential in environmental monitoring and CO2 detection.

Overall, this thesis emphasizes the versatility and adaptability of CNFs as a sustainable biomaterial for developing stimuli-responsive devices. The insights gained from studying CNFs in these varied applications contribute significantly to materials science and open new avenues for research in sustainable, bio-based materials.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry, Stockholm University, 2024. p. 45
Keywords
bio-based materials, cellulose nanofibrils, CO2 sorption, soft actuators, stimuli-responsive materials
National Category
Materials Chemistry Biomaterials Science
Research subject
Materials Chemistry
Identifiers
urn:nbn:se:su:diva-224538 (URN)978-91-8014-627-2 (ISBN)978-91-8014-628-9 (ISBN)
Public defence
2024-02-16, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (English)
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Supervisors
Available from: 2024-01-24 Created: 2023-12-17 Last updated: 2024-01-16Bibliographically approved

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Héraly, FrédéricYuan, Jiayin

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