Agnes Åhl

I stared my academic journey at Umeå university in 2015, after 5 years I graduated with a MSc in Chemistry and a MSc in Bioresource Engineering. With a close collaboration with Umeå Plant Science Centre and the industry, a foundation consisting on fundamental plant biotechnology and green chemistry was built.

In my SwedNess PhD project, I will study nanocellulose based materials and its properties such as strength and thermal conductivity at different conditions. As a hygroscopic material, nanocellulose is highly sensitive to moisture and when exposed, it will start to swell which will weaken the interfibrillar bonding, allowing for easier debonding and a significant decrease in mechanical properties. It is known that the mechanical strength of nanocellulose-based materials can lose up to 90% of its strength at wet conditions, compared to dry. It has also been shown that the thermal conductivity of nanocellulose-based materials is moisture dependent as the swelling affects the interfibrillar distance. To gain a better understanding of the properties of nanocellulose at different conditions, I plan to use primarily SANS and INS in my project.

Publications

Multimodal Structural Humidity-Response of Cellulose Nanofibril Foams Derived from Wood and Upcycled Cotton Textiles. A. Åhl, MX. Ruiz-Caldas, E. Nocerino, A.L.C. Conceição, K. Nygård, S. McDonald, M. Viljanen, A.P. Mathew, L. Bergström. Carbohydrate Polymers (2025) https://doi.org/10.1016/j.carbpol.2025.123485

Moisture-Dependent Vibrational Dynamics and Phonon Transport in Nanocellulose Materials A. Åhl, E. Nocerino, U. Thalakkale Veettil, K. Uetani, S. Yu, J. Armstrong, F. Juranyi, L. Bergström Advanced Materials, 2415725 (2024).
https://doi.org/10.1002/adma.202415725

Hierarchical Incorporation of Reduced Graphene Oxide into Anisotropic Cellulose Nanofiber Foams Improves Their Thermal Insulation. S. Ehsan Hadi, E. Möller, S. Nolte, A. Åhl, O. Donzel-Gargand, L. Bergström, A. Holm. ACS Applied Materials & Interfaces, 16, 34, 45337-45346 (2024). https://doi.org/10.1021/acsami.4c09654

The influence of drying routes on the properties of anisotropic all-cellulose composite foams from post-consumer cotton clothing. C. Schiele, MX. Ruiz-Caldas, T. Wu, E. Nocerino, A. Åhl, A.P. Mathew, G. Nyström, L. Bergström, V. Apostolopoulou-Kalkavoura. Nanoscale, 14, 14275-14286 (2024). https://doi.org/10.1039/D4NR01720J 

Highly magnetic hybrid foams based on aligned tannic acid-coated iron oxide nanoparticles and TEMPO-oxidized cellulose nanofibers. S. E. Hadi, H. A. Yeprem, A. Åhl, M. Morsali, M. Kapuscinski, K. Kriechbaum, M. H. Sipponen, L. Bergström. RSC Adv. vol 20, 13919-13927 (2023) https://doi.org/10.1039/D3RA01896B

Nanodancing with moisture: humidity-sensitive bilayer actuator derived from cellulose nanofibrils and reduced graphene oxide. F. Heraly, M. Zhang, A. Åhl, W. Cao, L. Bergström, J. Yuan, Adv. Intelligent Systems 2100084 (2021), https://doi.org/10.1002/aisy.202100084