M
Mari Nuopponen
Researcher at Helsinki University of Technology
Publications - 12
Citations - 788
Mari Nuopponen is an academic researcher from Helsinki University of Technology. The author has contributed to research in topics: Raman spectroscopy & Resin acid. The author has an hindex of 10, co-authored 12 publications receiving 738 citations.
Papers
More filters
Journal ArticleDOI
Thermal Modifications in Softwood Studied by FT‐IR and UV Resonance Raman Spectroscopies
TL;DR: In this article, the UVRR and FT-IR spectra of acetone extracts showed that lignin became partly acetone soluble after a heat treatment of 180°C or greater.
Journal ArticleDOI
The effects of a heat treatment on the behaviour of extractives in softwood studied by FTIR spectroscopic methods
TL;DR: In this article, a typical absorption band of fats and waxes at 1740 cm-1 was detected on the sapwood edges in the temperature range of 100-160o C.
Journal ArticleDOI
Heat‐treated softwood exposed to weathering
Mari Nuopponen,Hanne Wikberg,Tapani Vuorinen,Sirkka Liisa Maunu,Saila Jämsä,Pertti Viitaniemi +5 more
TL;DR: In this article, weathered and unweathered samples were examined with FTIR, UV resonance Raman, and 13C CPMAS NMR spectroscopies and the results indicated that heat-treated wood is more resistant to natural weathering than untreated wood.
Journal ArticleDOI
Ultra Violet Resonance Raman Spectroscopy in Lignin Analysis: Determination of Characteristic Vibrations of p-Hydroxyphenyl, Guaiacyl, and Syringyl Lignin Structures
TL;DR: The characteristic bands of the three structural units were also found from the compression wood, softwood, and hardwood samples, indicating that UVRR spectroscopy can be applied for the determination of chemical structures of lignin.
Journal ArticleDOI
A UV resonance Raman (UVRR) spectroscopic study on the extractable compounds of Scots pine (Pinus sylvestris) wood Part I: Lipophilic compounds
TL;DR: The characteristic band of pinosylvin (996 cm(-1)) was detected in the UVRR spectrum of the resin rich knotwood, which indicated that the wood resin in the knotwood was resonance enhanced even more than lignin.