Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Kirsi Leppänen"'
Autor:
Pekka Saranpää, Ari Salmi, Ritva Serimaa, Antti Meriläinen, Kirsi Leppänen, Marko Peura, Kari Pirkkalainen
Publikováno v:
Wood Science and Technology. 46:1113-1125
Secondary xylem of Norway spruce was studied by X-ray microanalysis. Average dimensions of cellulose crystallites, fraction of oriented cellulose, mean microfibril angle, and nutrient element concentrations of K, Ca, Mn, and Zn were simultaneously de
Autor:
Jonathan Love, Jussi-Petteri Suuronen, Aki Kallonen, Paavo A. Penttilä, Ingela Bjurhager, Kirsi Leppänen, Ritva Serimaa, Kurt V. Fagerstedt, Marko Peura
Publikováno v:
hfsg. 65:865-873
The impact of drying on the structure of the never-dried hardwood cell wall was studied at nanometer level by means of wide- and small-angle X-ray scattering (WAXS, SAXS), and at micrometer level by X-ray microtomography (μCT). Never-dried silver bi
Publikováno v:
Wood Science and Technology. 46:317-332
The relationship between the nanostructure of Moso bamboo (Phyllostachys edulis (Carr.) H. De Lehaie) and the radial distance from the lacuna and the age of the culm was studied using X-ray scattering and electron microscopy. The size of cellulose cr
Autor:
Matti Knaapila, N. E. Kotelnikova, Kirsi Leppänen, Seppo Andersson, Mika Torkkeli, Ritva Serimaa
Publikováno v:
Cellulose. 16:999-1015
The structure of microcrystalline cellulose (MCC) made by mild acid hydrolysis from cotton linter, flax fibres and sulphite or kraft cooked wood pulp was studied and compared with the structure of the starting materials. Crystallinities and the lengt
Publikováno v:
Tetrahedron. 64:10381-10387
Intermolecular additive free microwave (MW) promoted and cobalt octacarbonyl mediated Pauson–Khand reaction (PKR) performance was improved for estrone ring extension. The reaction development with norbornene and cyclopentene produced cyclopentenone
Autor:
N. E. Kotelnikova, Tiiu Elbra, Kari Pirkkalainen, Antti Nykänen, Ulla Vainio, Janne Ruokolainen, Ritva Serimaa, Tomas Kohout, M Webb, Kirsi Leppänen
Publikováno v:
The European physical journal / D 49, 333-342 (2008). doi:10.1140/epjd/e2008-00180-5
Polymeric matrices with stabilized metallic nanoparticles constitute an important class of nanostructured materials, because polymer technology allows fabrication of components with various electronic, magnetic and mechanical properties. The porous c
Autor:
Ari Laiho, Jun Shan, Kirsi Leppänen, Heikki Tenhu, Petri Pulkkinen, Mikael Järn, Ari Känsäkoski
Publikováno v:
ACS applied materialsinterfaces. 1(2)
The aim of this research was to explore the use of amine-containing polymeric and low-molar-mass organic protecting agents in the preparation of copper nanoparticles. Particles were synthesized using poly(ethylene imine) (PEI) or tetraethylenepentami
Autor:
Pentti Jääskeläinen, Matti Siika-aho, Anikó Várnai, Marko Peura, Kirsi Leppänen, Janne Ruokolainen, Liisa Viikari, Jessica Lucenius, Aki Kallonen, Ritva Serimaa, Paavo A. Penttilä
Publikováno v:
Penttilä, P A, Varnai, A, Leppänen, K, Peura, M, Kallonen, A, Jääskeläinen, P, Lucenius, J, Ruokolainen, J, Siika-aho, M, Viikari, L & Serimaa, R 2010, ' Changes in submicrometer structure of enzymatically hydrolyzed microcrystalline cellulose ', Biomacromolecules, vol. 11, no. 4, pp. 1111-1117 . https://doi.org/10.1021/bm1001119
To understand the limitations occurring during enzymatic hydrolysis of cellulosic materials in renewable energy production, we used wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), X-ray microtomography, and transmission elect
Autor:
Paavo A. Penttilä, Jenni Sievänen, Kari Pirkkalainen, N. E. Kotelnikova, Ritva Serimaa, Kirsi Leppänen
Publikováno v:
Leppänen, K, Pirkkalainen, K, Penttilä, P, Sievänen, J, Kotelnikova, N & Serimaa, R 2010, ' Small-angle X-ray scattering study on the structure of microcrystalline and nanofibrillated cellulose ', Journal of Physics: Conference Series, vol. 247, no. 1, 012030 . https://doi.org/10.1088/1742-6596/247/1/012030
The effects of different solvents on the structure of microcrystalline and nanofibrillated cellulose (MCC, NFC) were studied using small-angle x-ray scattering (SAXS). MCC was immersed in water, ethanol, and acetone, and NFC was immersed only in wate