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Modification and Future Potential of Never-Dried Microcrystalline Cellulose (MCC)

Thesis defender: Anniina Lähdeniemi 
Opponent: Prof. Akira Isogai, The University of Tokyo, Japan 
Custos: Prof. Olli Dahl Aalto University School of Chemical Engineering

Doctoral Dissertation: Modification and Future Potential of Never-Dried Microcrystalline Cellulose (MCC) 
 

The commercialization of wood-based nanomaterials has been slower than anticipated, and traditional microcrystalline cellulose does not always meet the requirements of specialized industries—such as pharmaceuticals or food—regarding geometry or surface area. The aim of this research was to investigate how the modification of "never-dried" MCC using new techniques affects the properties of the final product and the energy efficiency of the process.

The study is positioned at the interface of the pulp and paper industry and new bio-based materials, aiming to replace, for example, oil-based components with more sustainable alternatives. The results demonstrated that the drying method (cyclone, spray, or fluidized bed drying) determines the morphology of the MCC. As a key finding, it was observed that using never-dried MCC as a raw material leads to stronger and structurally superior MFC gels with lower energy consumption compared to pre-dried MCC raw material.

The research provides new insights into the effects of dewatering mechanisms on the aggregation of cellulose particles and shows that mechanical energy is transferred more efficiently into the never-dried MCC structure. This information can be utilized in the food, cosmetics, and pharmaceutical industries, as well as in materials science as a reinforcement agent for biocomposites. The study concludes that the original state of the raw material and the processing method are critical factors for the quality of the end product and the economic viability of the manufacturing process. Utilizing never-dried MCC offers an energy-efficient pathway for the production of high-quality micro- and nanocellulose products.
 

microcrystalline cellulose, microfibrillated cellulose, cellulose drying, cellulose mechanical treatment, mild acid cellulose hydrolysis

Thesis available for public display 7 days prior to the defence at .

Contact information: annina.lahdeniemi@gmail.com