Combining confocal Raman spectroscopy and atomic force microscopy to study wood extractives on cellulose surfaces

Österberg, Monika; Schmidt, Ute; Jääskeläinen, Anna Stiina

doi:10.1016/j.colsurfa.2006.06.039

Cited by 30 publications

(14 citation statements)

References 17 publications

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“…The AFM phase contrast images of cellulose I were similar to earlier results on Whatman cellulose filter paper (Ö sterberg et al 2006;Piantanida et al 2005). No previous AFM measurements on mercerized cellulose II fibres were found.…”

Section: Afm Imagingsupporting

confidence: 84%

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Eronen¹,

Österberg²,

Jääskeläinen³

2008

Cellulose

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The aim of this work was to investigate the morphological and structural changes associated with mercerization of cellulose fibres with combined confocal Raman and atomic force microscopy (AFM). During mercerization the alkali induces a change in polymorphic lattice from cellulose I to II. This was observed by confocal Raman spectroscopy from cellulose samples treated with 10, 15 and 25% aqueous sodium hydroxide solution. AFM images from the same samples illustrated that microfibrils were swollen and more granular in cellulose II than in cellulose I. Raman spectral images in plane and depth directions showed that the polymorphous cellulose structure was uniform throughout the cell wall, whereas the microfibril orientation varied between fibre cell wall layers. The changes in microfibril orientation on the sample surfaces were confirmed by AFM images measured from the same sample position.

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Section: Afm Imagingsupporting

confidence: 84%

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Eronen¹,

Österberg²,

Jääskeläinen³

2008

Cellulose

Self Cite

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“…No seasonal pattern in the concentration was found, indicating that heartwood formation was not linked to a specific time of the year. In another study by Osterberg et al (2006), precipitated wood extractives were detected on cellulose fibres using a combined atomic force microscope (AFM) and confocal Raman microscope, which made it possible to obtain morphological and chemical information from the same location within the sample.…”

Section: Uv-vis Spectra Of Lignin and Other Ring Structuresmentioning

confidence: 99%

“…The fluorescence problem can also be circumvented by probing well below the fluorescence emission in the ultraviolet (UV) (Halttunen et al 2001), an approach that offers also the benefit of a higher signal strength compared to NIR excitation. The UV resonance Raman (UVRR) technique was successfully applied to pulp and paper samples (Halttunen et al 2001;Jääskeläinen et al 2006;Saariaho et al 2003Saariaho et al , 2004Saariaho et al , 2005, heat treated wood (Nuopponen et al 2004) and for investigations on the photodegradation of lignin (Pandey and Vuorinen 2008).…”

Section: Principles Of Infrared Raman and Uv Microspectroscopy With mentioning

confidence: 99%

Microspectroscopy as applied to the study of wood molecular structure

Fackler

Thygesen

2012

Wood Sci Technol

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Microspectroscopy gives access to spatially resolved information on the molecular structure and chemical composition of a material. For a highly heterogeneous and anisotropic material like wood, such information is essential when assessing structure/property relationships such as moisture-induced dimensional changes, decay resistance or mechanical properties. It is, however, important to choose the right technique for the purpose at hand and to apply it in a suitable way if any new insights are to be gained. This review presents and compares three different microspectroscopic techniques: infrared, Raman and ultraviolet. Issues such as sample preparation, spatial resolution, data acquisition and extraction of knowledge from the spectral data are discussed. Additionally, an overview of applications in wood science is given for each method. Lastly, current trends and challenges within microspectroscopy of wood are discussed.

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“…[25] The sensitive regions for PEG lie at 848 cm À1 (COC symmetric stretching) and 1067 and 1144 cm À1 (COC asymmetric stretching). [26] The asymmetric stretching of COC in PEG200 is located at 1133 cm…”

mentioning

confidence: 99%

High‐Strength Cellulose/Poly(ethylene glycol) Gels

Liang

Tian

et al. 2008

ChemSusChem

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Cellulose gel membranes have been prepared by a pre-gelation method employing cellulose solutions in aqueous NaOH-thiourea obtained at low temperature. The cellulose gels were then swollen by low-molecular-weight polyethylene glycol (PEG; MW<1000 g mol(-1)), and the morphology, structure and mechanical properties of the cellulose/PEG gels were studied by various techniques. The gels exhibit high mechanical performance, and the tensile strength of the gel membranes increases sharply with an increase in the molecular weight of PEG from 200 to 800 g mol(-1). Moreover, their elongation at break remains stable at 100 %. PEG800 efficiently improves the optical transmittance of the gel membranes at ambient temperature, which is about five times greater than that of a normal cellulose hydrogel membrane. A strong hydrogen-bonding interaction occurs between PEG and cellulose leading to a homogeneous structure, high mechanical strength and good transparency of the gel membranes.

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Combining confocal Raman spectroscopy and atomic force microscopy to study wood extractives on cellulose surfaces

Cited by 30 publications

References 17 publications

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy

Microspectroscopy as applied to the study of wood molecular structure

High‐Strength Cellulose/Poly(ethylene glycol) Gels

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