Publications

Peer-reviewed articles

2026

Ahvenainen, P., Noriega Benitez, E., Jyske, T., Viljanen, M., Suhonen, H., Penttilä, P. “Tissue-specific variation of softwood nanostructure revealed by scanning wide-angle X-ray scattering and clustering analysis.” Cellulose, 33(5), pp. 2653–2675. DOI
Zhou, C., Jia, Y., Ahvenainen, P., Penttilä, P., Kobayashi, K., Wada, M. “Mechanical properties of cellulose hydrogels prepared by dissolution/gelation in molten lithium salt hydrates.” Cellulose, pp. 1–14. DOI
Ahvenainen, P., Bertella, S., Kellock, M., Berg, J., Mota-Santiago, P., Wikberg, H., Fearon, O., Hänninen, R., Penttilä, P. “In Situ Characterization of Lignin Precipitation by Synchrotron Small-Angle X-Ray Scattering.” Chemistry-Methods, 6(7), e70135. DOI

2025

Noriega Benitez, E., Ahvenainen, P., Mäkelä, M., Penttilä, P. “Clustering of spatially-resolved scattering and spectroscopy data for characterizing local variations in spruce wood.” Next Materials, 9, 101350. DOI
Ahvenainen, P., Zitting, A., Noriega Benitez, E., Liljeström, V., Trevorah, R.M., Penttilä, P. “Effects of moisture imbibition on cellulose microfibril structures in paper and wood observed by in situ X-ray scattering.” Carbohydrate Polymers, 370, 124362. DOI (Open Access)
Makkonen, J., Ahvenainen, P., Bertella, S., Kellock, M., Saha, S., Huber, K., Farooq, M., Österberg, M., Penttilä, P. “Static Light Scattering for Lignin Particle Size Characterization.” Particle & Particle Systems Characterization, 43(1), e00085. DOI (Open Access)

2020

Viljanen, M., Ahvenainen, P., Penttilä, P., Help, H., Svedström, K. “Ultrastructural X-ray scattering studies of tropical and temperate hardwoods used as tonewoods.” IAWA Journal, 41(3), pp. 301–319. DOI (Open Access)
Pere, J., Tammelin, T., Niemi, P., Lille, M., Virtanen, T., Penttilä, P.A., Ahvenainen, P., Grönqvist, S. “Production of High Solid Nanocellulose by Enzyme-Aided Fibrillation Coupled with Mild Mechanical Treatment.” ACS Sustainable Chemistry & Engineering, 8(51), pp. 18853–18863. DOI

2019

Ahvenainen, P. “Anatomy and mechanical properties of woods used in electric guitars.” IAWA Journal, 40(1), pp. 106–S6. DOI · PDF

2018

Nishiyama, Y., Asaadi, S., Ahvenainen, P., Sixta, H. “Water-induced crystallization and nano-scale spinodal decomposition of cellulose in NMMO and ionic liquid dope.” Cellulose, 26(1), pp. 281–289. DOI
Buffiere, J., Abad, N., Ahvenainen, P., Dou, J., Cocero, M.J., Sixta, H. “Tailoring the structure and morphology of low-molecular-weight cellulose produced during supercritical water hydrolysis.” ACS Sustainable Chemistry & Engineering, 6(12), pp. 16959–16967. DOI
Borrega, M., Ahvenainen, P., Kontturi, E. “Impact of hydrothermal and alkaline treatments of birch kraft pulp on the levelling-off degree of polymerization (LODP) of cellulose microfibrils.” Cellulose, 25(11), pp. 6811–6818. DOI
Borrega, M., Larsson, P.T., Ahvenainen, P., Ceccherini, S., Maloney, T., Rautkari, L., Sixta, H. “Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application.” Carbohydrate Polymers, 190, pp. 212-221. DOI
Asaadi, S., Hummel, M., Ahvenainen, P., Gubitosi, M., Olsson, U., Sixta, H. “Structural analysis of Ioncell-F fibres from birch wood.” Carbohydrate Polymers, 181, pp. 893-901. DOI

2017

Pawar, P.M.-A., Derba-Maceluch, M., Chong, S.-L., Gandla, M.L., Bashar, S.S., Sparrman, T., Ahvenainen, P., Hedenström, M., Özparpucu, M., Rüggeberg, M., Serimaa, R., Lawoko, M., Tenkanen, M., Jönssn, L.J., Mellerowicz, E.J. “In muro deacetylation of xylan affects lignin properties and improves saccharification of aspen wood.” Biotechnology for Biofuels, 10:98. DOI
Ahvenainen, P., Dixon, P.G., Kallonen, A., Suhonen, H., Gibson, L.J., Svedström, K. “Spatially-localized bench-top X-ray scattering reveals tissue-specific microfibril orientation in Moso bamboo.” Plant Methods, 13:5. DOI (Open Access)

2016

Kontro, I., Svedström, K., Duša, F., Ahvenainen, P., Ruokonen, S.-K., Witos, J., Wiedmer, S.K. “Effects of phosphonium-based ionic liquids on phospholipid membranes studied by small-angle X-ray scattering.” Chemistry and Physics of Lipids, 201, pp. 59-66. DOI
Buffiere, J., Ahvenainen, P., Borrega, M., Svedström, K., Sixta, H. “Supercritical water hydrolysis: a green pathway for producing low-molecular-weight cellulose.” Green Chemistry, 18(24), pp. 6516-6525. DOI
Palomäki, E., Ahvenainen, P., Ehlers, H., Svedström, K., Huotari, S., Yliruusi, J. “Monitoring the recrystallisation of amorphous xylitol using Raman spectroscopy and wide-angle X-ray scattering.” International Journal of Pharmaceutics, 508(1-2), pp. 71-82. DOI
Ahvenainen, P., Kontro, I., Svedström, K. “Comparison of sample crystallinity determination methods by X-ray diffraction for challenging cellulose I materials.” Cellulose, 23(2), pp. 1073-1086. DOI · PDF

2015

Ma, Y., Asaadi, S., Johansson, L.-S., Ahvenainen, P., Reza, M., Alekhina, M., Michud, A., Hauru, L., Hummel, M., Sixta, H. “High-Strength Composite Fibers from Cellulose-Lignin Blends Regenerated from Ionic Liquid Solution.” ChemSusChem, 8(23), pp. 4030–4039. DOI
Josefsson, G., Ahvenainen, P., Mushic, N.E., Gamstedt, E.K. “Fibril orientation redistribution induced by stretching of cellulose nanofibril hydrogels.” Journal of Applied Physics, 117(21), 214311. DOI · PDF
Dixon, P.G., Ahvenainen, P., Aijazi, A.N., Chen, S.H., Lin, S., Augusciak, P.K., Borrega, M., Svedström, K., Gibson, L.J. “Comparison of the structure and flexural properties of Moso, Guadua and Tre Gai bamboo.” Construction and Building Materials, 90, pp. 11–17. DOI · PDF
Borrega, M., Ahvenainen, P., Serimaa, R., Gibson, L. “Composition and structure of balsa (Ochroma pyramidale) wood.” Wood Science and Technology, 49(2), pp. 403-420. DOI
Parviainen, H., Parviainen, A., Virtanen, T., Kilpeläinen, I., Ahvenainen, P., Serimaa, R., Grönqvist, S., Maloney, T., Maunu, S.L. “Dissolution enthalpies of cellulose in ionic liquids.” Carbohydrate Polymers, 113, pp. 67–76. Link

2010

Ahvenainen, P., Kassamakov, I., Hanhijärvi, K., Aaltonen, J., Lehto, S., Reinikainen, T., Hæggström, E. “CSI Helsinki: SWLI in Forensic Science: Comparing Toolmarks of Diagonal Cutting Pliers.” AIP Conference Proceedings, 1211, 2084. DOI · PDF
Kassamakov, I., Barbeau, C., Lehto, S., Ahvenainen, P., Reinikainen, T., Hæggström, E. “CSI Helsinki: Comparing three-dimensional imaging of diagonal cutter toolmarks using confocal microscopy and SWLI.” Proc. SPIE 7690, Three-Dimensional Imaging, Visualization, and Display 2010, pp. 269–277. DOI

Doctoral Thesis (2016) — “X-ray scattering studies on crystallinity and the hierarchical structure of plants.” University of Helsinki. ISBN:978-951-51-2229-2. Supervisors: Ritva Serimaa, Simo Huotari, Kirsi Svedström.
Master’s Thesis (2012) — “Nanoscale Structural Study of Genetically Modified Arabidopsis Thaliana by X-Ray Radiation.” University of Helsinki. URN:NBN:fi-fe201205155552. Supervisor: Ritva Serimaa.