PUBLICATIONS

M. Viljanen, Ahvenainen, P., Pentilä, P., Help, H. & Svedström, K. (2020). "Ultrastructural X-ray scattering studies of tropical and temperate hardwoods used as tonewoods" IAWA Journal doi:10.1163/22941932-bja10010

Open access, also available at Brill Online via doi:10.1163/22941932-bja10010.

(Contribution: Collection and partial preparation of samples, assistance of WAXS measurements and data analysis; Assistance on WAXS data analysis, tonewood classification of samples)

Ahvenainen, P. (2019). "Anatomy and mechanical properties of woods used in electric guitars" IAWA Journal (Online)doi:10.1163/22941932-40190218

Copyright 2018 Brill. The final publication is available at Brill Online via doi:10.1163/22941932-40190218.

(Contribution: Collection and statistical analysis of wood anatomical and elastomechanical data and combining this with woods used in electric guitars; first author, data collection, principal component analysis on R, other statistical analysis)

Nishiyama, Y., Asaadi, S. Ahvenainen, P. & Sixta., H (2018). "Water-induced crystallization and nano-scale spinodal decomposition of cellulose in NMMO and ionic liquid dope." Cellulose (Online), doi:10.1007/s10570-018-2148-x

(Contribution: participation in sample preparation and simultaneous synchrotron SAXS/WAXS measurements at ESRF BM02)

Buffiere, J., Abad, N., Ahvenainen, P,  Dou, J., Cocero, M. J., & Sixta, H. (2018). "Tailoring the structure and morphology of low-molecular-weight cellulose produced during supercritical water hydrolysis." ACS Sustainable Chemistry & Engineering. 6, pp. 16959–16967, doi:10.1021/acssuschemeng.8b04296

(Contribution: powder X-ray scattering measurements and related data analysis; determination of cellulose II content and qualitative assessment of  different cellulose polymorph contents (with JB))

Borrega, M.,  Ahvenainen, P. & Kontturi, E. (2018). "Impact of hydrothermal and alkaline treatments of birch kraft pulp on the levelling-off degree of polymerization (LODP) of cellulose microfibrils" Cellulose. 25, pp. 6811–6818, doi:10.1007/s10570-018-2017-7

(Contribution: X-ray scattering measurements and related data analysis; determination of average crystallite sizes from several cellulose reflections, estimation of cellulose II content and determination of sample crystallinity)

Borrega, M., Larsson, P. T., Ahvenainen, P., Ceccherini, S., Maloney, T., Rautkari, L., & Sixta, H. (2018). "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:10.1016/j.carbpol.2018.02.064

(Contribution: X-ray scattering measurements and related data analysis; determination of average crystallite sizes from several cellulose I reflections and determination of sample crystallinity)

Asaadi, S., Hummel, M., Ahvenainen, P., Gubitosi, M., Olsson, U. & Sixta, H. (2018). "Structural analysis of Ioncell-F fibres from birch wood." Carbohydrate Polymers, 181, pp. 893-901. doi:10.1016/j.carbpol.2017-11-062

(Contribution: participation in the small-angle and wide-angle X-ray scattering data analysis; determination of relative specific surface and orientation from SAXS data, and average crystallite size estimate from WAXS data)

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., Jönssön, L. J. & Mellerowicz, E. J. (2017). "In muro deacetylation of xylan affects lignin properties and improves saccharification of aspen wood." Biotechnology for Biofuels, 10:98. doi:10.1186/s13068-017-0782-4

(Contribution: X-ray scattering measurements and related data analysis; determination of sample crystallinity)

Ahvenainen, P, Dixon, P. G., Kallonen, A., Suhonen, H., Gibson, L. J. & Svedström, K. (2017). "Spatially-localized bench-top X-ray scattering reveals tissue-specific microfibril orientation in Moso bamboo." Plant Methods, 13:5. doi:10.1186/s13007-016-0155-1

Copyright 2017 the Authors. Open access, available online at doi:10.1186/s13007-016-0155-1. Supporting data set is available at doi:10.5281/zenodo.60046. The article and the supporting data set are both published under Creative Commons Attribution 4.0.

(Contribution: Localized X-ray scattering, X-ray microtomography and X-ray diffraction tomography measurements (with AK and HS) and wide-angle X-ray scattering measurements, all data analysis, first author; determination of microfibril orientation distribution in different bamboo tissues)

Kontro, I., Svedström, K., Duša, F., Ahvenainen, P.,  Ruokonen, S.-K., Witos, J., Wiedmer, S. K. (2016). "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:10.1016/j.chemphyslip.2016.11.003

(Contribution: Participation in synchrotron small-angle X-ray scattering measurements)

Buffiere, J.,  Ahvenainen, P,  Borrega, M.,  Svedström, K. & Sixta, H. (2016). "Supercritical water hydrolysis: a green pathway for producing low-molecular-weight cellulose." Green Chemistry, 18, pp. 6516-6525,  doi:10.1039/C6GC02544G

(Contribution: powder X-ray scattering measurements and related data analysis; determination of sample crystallinity, cellulose II content and crystallite sizes from several reflections (cellulose I and cellulose II))

Palomäki, E., Ahvenainen, P., Ehlers, H., Svedström, K., Huotari, S., & Yliruusi, J. (2016). "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:10.1016/j.ijpharm.2016.04.074

(Contribution: Time-resolved X-ray scattering measurements and related data analysis; determination of sample crystallinity)

Ahvenainen, P., Kontro, I., & Svedström, K. (2016). "Comparison of sample crystallinity determination methods by X-ray diffraction for challenging cellulose I materials." Cellulose, 23(2), pp. 1073-1086. doi:10.1007/s10570-016-0881-6

Copyright 2016 Springer Science+Business Media Dordrecht. The final publication is available at Springer via doi:10.1007/s10570-016-0881-6.

(Contribution: X-ray scattering measurements, data collecting, scripting and all data analysis, first author; determination of sample crystallinity using six different methods)

Ma, Y., Asaadi, S., Johansson, L.-S., Ahvenainen, P., Reza, M., Alekhina, M., Michud, A., Hauru, L., Hummel, M. & Sixta, H. (2015). "High-Strength Composite Fibers from Cellulose-Lignin Blends Regenerated from Ionic Liquid Solution". ChemSusChem, 8(23), pp. 4030–4039. doi:10.1002/cssc.201501094

 

(Contribution: X-ray scattering measurements and related data analysis; determination of sample crystallinity)

The following article appeared in  

Josefsson, G., Ahvenainen, P., Mushic, N. E., & Gamstedt, E. K. (2015). "Fibril orientation redistribution induced by stretching of cellulose nanofibril hydrogels." Journal of Applied Physics, 117, 214311. doi:10.1063/1.4922038

and may be found at http://dx.doi.org/10.1063/1.4922038.

Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

(Contribution: X-ray scattering measurements (together with GJ), initial related data analysis; determination of fibril orientation distribution)

 

The following article appeared in  

Dixon, P. G., Ahvenainen, P., Aijazi, A. N., Chen, S. H., Lin, S., Augusciak, P. K., Borrega, M., Svedström, K., Gibson, L. J. (2015). "Comparison of the structure and flexural properties of Moso, Guadua and Tre Gai bamboo." Construction and Building Materials, 90, pp. 11–17. doi:10.1016/j.conbuildmat.2015.04.042.

and may be found at http://dx.doi.org/10.1016/j.conbuildmat.2015.04.042.

Copyright 2015 Elsevier. 

(Contribution: X-ray scattering measurements and related data analysis; determination of sample crystallinity and crystallite orientation)

 

Borrega, M., Ahvenainen, P., Serimaa, R., Gibson, L. (2015) "Composition and structure of balsa (Ochroma pyramidale) wood." Wood Science and Technology, 49, pp. 403-420, doi: 10.1007/s00226-015-0700-5.

 

(Contribution: X-ray scattering measurements and related data analysis using three different measurement geometries; determination of crystallite width and length, crystallite orientation, and sample crystallinity)

 

Parviainen, H., Parviainen, A., Virtanen, T., Kilpeläinen, I., Ahvenainen, P., Serimaa, R., Grönqvist, S., Maloney, T., Maunu, S. L. (2014). "Dissolution enthalpies of cellulose in ionic liquids." Carbohydrate Polymers, 113, pp. 67–76. doi:10.1016/j.carbpol.2014.07.001

 

(Contribution: X-ray scattering measurements and related data analysis; Scattering intensity curves and crystallite size determinations available in the supplementary material) 

Doctoral Thesis

X-ray scattering studies on crystallinity and the hierarchical structure of plants

University of Helsinki, November 26, 2016
Supervisors: Ritva Serimaa, Simo Huotari and Kirsi Svedström

 

Master's Thesis

Nanoscale Structural Study of Genetically Modified Arabidopsis Thaliana by X-Ray Radiation

University of Helsinki, January 30, 2012
Supervisor: Ritva Serimaa

 

Other work

 

The following article appeared in P. Ahvenainen et al., AIP Conf. Proc. 1211, 2084 (2010), and may be found at http://link.aip.org/link/?APCPCS/1211/2084/1

 

CSI HELSINKI: SWLI IN FORENSIC SCIENCE: COMPARING TOOLMARKS OF DIAGONAL CUTTING PLIERS

P. Ahvenainen, I. Kassamakov, K. Hanhijärvi, J. Aaltonen, S. Lehto, T. Reinikainen, and E. Hæggström, AIP Conf. Proc. 1211, 2084 (2010), DOI:10.1063/1.3362387,

Presented by Prof. Edward Hæggström at the 2009 Quantitative Nondestructive Evaluation Conference held 26-31 July in Kingston, Rhode Island

 

PDF (299 kB)

 

Copyright 2010 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.