Drying process of microcrystalline cellulose studied by attenuated total reflection IR spectroscopy with two-dimensional correlation spectroscopy and principal component analysis

Watanabe, Akihiko; Morita, Shigeaki; Kokot, Serge; Matsubara, Mika; Fukai, Katsuhiko; Ozaki, Yukihiro

doi:10.1016/j.molstruc.2006.03.018

Cited by 81 publications

(79 citation statements)

References 36 publications

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“…From vibrational spectroscopic studies, it can be seen that wood-water interactions are dominated by interactions with O-H groups (hydroxyls), since deuteration only affects O-H vibrations, while C-H stretching vibrations remain unchanged and no C-D stretching vibrations are observed (Hofstetter et al 2006;Mann and Marrinan 1956a;Schmidt et al 2006;Taniguchi et al 1966;Watanabe et al 2006). After deuteration and drying, the relative accessibility of hydroxyls to water can be determined as the ratio of integrated areas of O-D to the sum of O-H and O-D vibrations (Suchy et al 2010b;Taniguchi et al 1966) or alternatively as the ratio of weighted intensities of O-D to the sum of O-H and O-D vibrations (Mann and Marrinan 1956b;Sepall and Mason 1961).…”

Section: Vibrational Spectroscopymentioning

confidence: 99%

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

2017

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Water plays a central role in wood research, since it affects all material properties relevant to the performance of wood materials. Therefore, experimental techniques for characterising water within wood are an essential part of nearly all scientific investigations of wood materials. This review focuses on selected experimental techniques that can give deeper insights into various aspects of water in wood in the entire moisture domain from dry to fully water-saturated. These techniques fall into three broad categories: (1) gravimetric techniques that determine how much water is absorbed, (2) fibre saturation techniques that determine the amount of water within cell walls, and (3) spectroscopic techniques that provide insights into chemical wood-water interactions as well as yield information on water distribution in the macro-void wood structure. For all techniques, the general measurement concept is explained, its history in wood science as well as advantages and limitations.

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Section: Vibrational Spectroscopymentioning

confidence: 99%

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

2017

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“…Marked changes in the bands at 3386,2963,2935,2874,1732,1457, and 1134 cm -1 were observed. The broad peak centered at 3386 cm -1 representing O-H stretching vibration, and the intensity of this band decreased in spectrum 2c; in addition, the peak position showed a blue shift, which is likely because the hydrogen bonds between the hydroxyl groups of the LS molecule were destroyed when O-H groups were substituted to form butyryl groups (Watanabe et al 2006). The increased intensity of C-H stretching peaks at 2963, 2935, 2874, and 1457 cm -1 indicate that new C-H bonds were introduced into the LS.…”

Section: Analysesmentioning

confidence: 99%

Butyration of Lignosulfonate with Butyric Anhydride in the Presence of Choline Chloride

Cheng

2015

BioResources

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A novel process was developed for the butyration of lignosulfonate (LS) with butyric anhydride in the presence of choline chloride at elevated temperatures. The degree of substitution (DS) was qualitatively and quantitatively determined by Fourier transform infrared spectroscopy using the baseline method. It was found that the DS of butyrated LS products increased from 0 to the range of 0.41 to 2.14 with the addition of choline chloride, indicating that butyric anhydride-choline chloride is a novel and highly effective solvent for the butyration of LS. The DS of butyrated LS was dependent on choline chloride dosage, reaction temperature, reaction time, and the mass ratio of butyric anhydride to LS. Characterization results by proton nuclear magnetic resonance spectroscopy further demonstrated the occurrence of the butyration reaction. The results of thermogravimetric analysis showed that the thermal stability of the butyrated LS decreased with increasing degree of substitution.

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“…In particular, absorbance due to C-O stretching, C-O-C asymmetric stretching, COH and CCH deformation vibrations, and CH 2 wagging are observed at 1,000-1,300 cm -1 as well as O-H stretching at 2,600-3,500 cm -1 (Proniewicz et al 2001;Watanabe et al 2006;Zhang et al 2009). Similar to previous studies, curve e shows that characteristic cellulose I peaks at these regions lose definition and broaden as crystallinity is lost when cellulose I is converted to cellulose II (Proniewicz et al 2001;Watanabe et al 2006;Zhang et al 2009). Fiber welded samples (curves b, c, d) show a progression of increased cellulose II character with additional treatment time.…”

Section: Chemical Propertiesmentioning

confidence: 99%

Process variables that control natural fiber welding: time, temperature, and amount of ionic liquid

et al. 2011

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A systematic study of variables that affect the fiber welding process is presented. Cotton cloth samples are treated with controlled amounts of 1-ethyl-3-methylimidazolium acetate for a series of times and temperatures. Diluting the ionic liquid with a volatile molecular co-solvent allows temporal and spatial control of the welding process not possible with neat ionic liquids. Materials are characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, and mechanical (tensile) testing. Results suggest careful management of process variables permits controlled, reproducible manipulation of chemical and physical properties.

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Drying process of microcrystalline cellulose studied by attenuated total reflection IR spectroscopy with two-dimensional correlation spectroscopy and principal component analysis

Cited by 81 publications

References 36 publications

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

Butyration of Lignosulfonate with Butyric Anhydride in the Presence of Choline Chloride

Process variables that control natural fiber welding: time, temperature, and amount of ionic liquid

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