Related Experiment Video
Updated: Jan 12, 2026
Highly Stable, Functional Hairy Nanoparticles and Biopolymers from Wood Fibers: Towards Sustainable Nanotechnology
Published on: July 20, 2016
Cellulose nanopaper with polymeric nanoparticle additives - what is the role of nanoparticle surface functionality?
Åsa Jerlhagen1,2,3, Korneliya Gordeyeva1,2,3, Vishnu Arumughan4
1KTH Royal Institute of Technology, Department of Fiber and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Teknikringen 56, SE-100 44 Stockholm, Sweden. mavem@kth.se.
Polymeric nanoparticles with tunable surface functionalities were synthesized via polymerization-induced self-assembly (PISA). Hydroxyl-functional nanoparticles showed enhanced adsorption onto cellulose nanofibrils (CNFs) in the wet state, but shell functionality had minor impact on dry state properties.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Polymer nanoparticles offer tunable surface properties for advanced material applications.
- Cellulose nanofibrils (CNFs) are sustainable nanomaterials with diverse applications.
- Understanding nanoparticle-CNF interactions is crucial for developing composite materials.
Purpose of the Study:
- To synthesize polymeric nanoparticles with varied surface functionalities using polymerization-induced self-assembly (PISA).
- To investigate the interactions between these functionalized nanoparticles and TEMPO-oxidized cellulose nanofibrils (TO-CNFs) in both wet and dry states.
- To determine the influence of nanoparticle shell functionality on adsorption and bulk mechanical properties.
Main Methods:
- Synthesis of polymeric nanoparticles with anionic, polyethylene glycol (PEG)-like, and hydroxyl-rich functionalities via PISA.
- Characterization of nanoparticle properties including hydrogen bonding, water binding, and glass transition temperatures.
- Adsorption studies of nanoparticles onto TO-CNFs in wet conditions and evaluation of bulk mechanical properties in dry states.
Main Results:
- Hydroxyl-functional nanoparticles demonstrated significantly enhanced and irreversible adsorption onto TO-CNFs in the wet state compared to anionic and PEG-like functionalized nanoparticles.
- Nanoparticle shell functionality played a minor role in the bulk mechanical properties of the dry composites; properties were primarily dependent on the amount of nanoparticles added.
- Additive interactions observed in the wet state (colloidal dispersion) did not directly translate to interactions or properties in the dry composite state.
Conclusions:
- Nanoparticle shell functionality critically impacts adsorption behavior and interactions with cellulose nanofibrils in aqueous environments.
- The influence of nanoparticle surface chemistry on bulk material properties diminishes in the dry state, with filler content becoming the dominant factor.
- This study highlights the importance of considering the state (wet vs. dry) when designing and predicting the performance of nanoparticle-CNF composites.
