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Nanodancing with Moisture: Humidity-Sensitive Bilayer Actuator Derived from Cellulose Nanofibrils and Reduced Graphene Oxide
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3334-9076
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3582-6075
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 62022 (English)In: Advanced Intelligent Systems, E-ISSN 2640-4567, Vol. 4, no 1, article id 2100084Article in journal (Refereed) Published
Abstract [en]

Bilayer actuators, traditionally consisting of two laminated materials, are the most common types of soft or hybrid actuators. Herein, a nanomaterial-based organic–inorganic humidity-sensitive bilayer actuator composed of TEMPO-oxidized cellulose nanofibrils (TCNF-Na+) and reduced graphene oxide (rGO) sheets is presented. The hybrid actuator displays a large humidity-driven locomotion with an atypical fast unbending. Cationic exchange of the anionically charged TCNF-Na+ and control of the layer thickness is used to tune and dictate the locomotion and actuator's response to humidity variations. Assembly of a self-oscillating electrical circuit, that includes a conductive rGO layer, displays autonomous on-and-off lighting in response to actuation-driven alternating electrical heating.

Place, publisher, year, edition, pages
2022. Vol. 4, no 1, article id 2100084
Keywords [en]
bilayer actuators, cellulose nanofibrils, humidity sensors, reduced graphene oxide, smart materials
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-198677DOI: 10.1002/aisy.202100084ISI: 000700058800001OAI: oai:DiVA.org:su-198677DiVA, id: diva2:1611563
Available from: 2021-11-15 Created: 2021-11-15 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)
Opponent
Supervisors
Available from: 2024-01-24 Created: 2023-12-17 Last updated: 2024-01-16Bibliographically approved

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Héraly, FrédéricZhang, MiaoÅhl, AgnesCao, WeiBergström, LennartYuan, Jiayin

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