Improving methods in X-ray nanotomography of fibre bonds
X-ray nanotomography has proven to be a useful yet challenging method in the study of cellulose fibre bonds. The challenges encountered in previous researches are related to lengthy imaging times and low success rate per sample. To counter these obstacles, fibre staining in order to enhance contrast in radiographic images and an alternative method for marker particle placement were examined in this study. Cesium iodide proved to be a suitable staining material, and the alternative method for particle placement may increase success rate by reducing microfibril structure fracturing during the marker placement process.
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Sormunen, Tuomas (2018)Paperi on stokastinen verkosto toisiinsa eri vuorovaikutusten, tärkeimpänä vetysidosten, avulla sitoutuneita sellukuituja. Paperin lujuus riippuu yksittäisten kuitusidosten lujuudesta ja sidospinta-alasta. Todellista ...
Willberg-Keyriläinen, Pia; Ropponen, Jarmo; Lahtinen, Manu; Pere, Jaakko (North Carolina State University, 2019)
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Cellulose nanofibrils prepared by gentle drying methods reveal the limits of helium ion microscopy imaging Ketola, Annika E.; Leppänen, Miika; Turpeinen, Tuomas; Papponen, Petri; Strand, Anders; Sundberg, Anna; Arstila, Kai; Retulainen, Elias (Royal Society of Chemistry, 2019)TEMPO-oxidized cellulose nanofibrils (TCNFs) have unique properties, which can be utilised in many application fields from printed electronics to packaging. Visual characterisation of TCNFs has been commonly performed using ...
Hernberg, Tero (2019)In hydrometallurgical processes, the separation of nickel and cobalt is challenging. Cyanex272 dialkyl phosphinic acid is generally used to separatet hese elements. The most eﬀective separation requires that the reaction ...