Structural physico-chemistry of cellulose macromolecules. Vibrational spectra and structure of cellulose

Zhbankov, R. G.; Firsov, S. P.; Buslov, D. K.; Nikonenko, N. A.; Marchewka, M.K.; Ratajczak, H.

doi:10.1016/s0022-2860(02)00252-1

Cited by 87 publications

(51 citation statements)

References 7 publications

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“…Spectra for microcrystalline cellulose, cellobiose, and glucose are shown for reference. Typical spectral features of cellulose are the broad bands due to O -H stretching vibration in the 3200 -3400 cm )1 region, the C -H stretch at 2900 cm )1 , and the deformation vibrations of the HC 6 H and COH groups in the 1400 -1500 cm )1 region (Zhbankov et al 2002). Spectra for the lowest densities were difficult to obtain because the sample residue so small.…”

Section: Discussionmentioning

confidence: 99%

Direct observation of cellulose dissolution in subcritical and supercritical water over a wide range of water densities (550–1000 kg/m3)

et al. 2005

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Direct observations of the heating of microcrystalline cellulose (230 DP) in water at temperatures up to 410°C and at pressures up to 700 MPa were made with a batch-type microreactor. Cellulose particles were found to dissolve with water over temperatures ranging from 315 to 355°C at high pressures. Dissolution temperatures depended on water density and decreased from about 350°C at a water density of 560 kg/m 3 to a minimum of around 320°C at a water density of 850 kg/m 3 . At densities greater than 850 kg/m 3 , the dissolution temperatures increased and reached a value of about 347°C at 980 kg/m 3 . The cellulose dissolution temperatures were independent of heating rates for values ranging from 10 to 17°C/s. The low dependence of dissolution temperatures on the heating rates is strong evidence for simultaneous dissolution and reaction of the cellulose. Different phenomena occurred depending on water density. At low densities, particles turned transparent and seemed to dissolve into the aqueous phase from the surface. From 670 to 850 kg/m 3 , the cellulose particles visibly swelled just before completely collapsing and dissolving into the aqueous phase. The swelling probably increased water accessibility and particle surface area and thus lead to the lower dissolution temperatures observed. From 850 to 1000 kg/m 3 , the particles required longer times to dissolve and many fine brown-like particles were generated as the particles dissolved. FT-IR spectra of the residues were analyzed. Residues formed from heating cellulose at high densities still retained some cellulose character whereas those as low densities had little cellulose character, especially in the O -H stretching vibration region.

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Section: Discussionmentioning

confidence: 99%

Direct observation of cellulose dissolution in subcritical and supercritical water over a wide range of water densities (550–1000 kg/m3)

et al. 2005

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“…The first method is based on FT-IR ATR spectra. According to the degradation results reported in the literature [4,[8][9][10][11][12], many intensity ratios have been examined in order to obtain a correlation of band integrated intensities versus age. The band integrals more sensible to age proved to be those in the range 2600-3080 cm -1 and 3070-3600 cm -1 , whereas those in the 800-1180 cm -1 and in the 1500-1760 cm -1 ranges did not change.…”

Section: Spectroscopic Datingmentioning

confidence: 99%

Molecular Spectroscopy as an alternative for dating Textiles

Baraldi

Tinti

2015

MATEC Web of Conferences

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Abstract. Ancient linen textiles undergo with time a slow change reflected in their Infrared and Raman spectra. The recording of FT-IR and FT-Raman spectra, that reveals a disappearance of some bands and appearance of other ones during the centuries, enables a kinetics of degradation to be followed. Here we discuss the results obtained by using dating methods based on two molecular spectroscopy techniques, that is FT-IR and FT-Raman. A set of samples dating from about 3500 B.C. until present has been examined in order to have an adequate set of reference samples. An accurate analysis of the spectra recorded shows that some differences can be attributed to the evolution of some chemical compounds present in the fibers. A linear correlation between a spectral property and time can be obtained. As an example the date of the Shroud of Turin has been evaluated.

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“…In order to study the interaction between the MWCNTs and the cellulose fiber surface, Raman spectra of the pristine MWCNTs, cellulose fibers and MWCNT-coated cellulose fibers were recorded. Figure 2 shows the bands at about 900 cm −1 and 1093 cm −1 from the spectrum of cellulose fiber that are characteristic bands from cellulose I [21], which do not show an obvious change after MWCNT coating on the surface of the fiber. The Raman spectra of MWCNTs in the range of 800-2000 cm −1 are dominated by two peaks, D-band (at 1337 cm −1 , attributed to disorder induced by defects and curvature in the nanotube lattice) and G-band (at 1577 cm −1 , due to the in-plane vibration of the C-C bonds) [20,22].…”

Section: The Formation Of Electrically Conducting Mwcnt Network On Cmentioning

confidence: 99%

Smart Cellulose Fibers Coated with Carbon Nanotube Networks

Liu

Mäder

2014

Fibers

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Smart multi-walled carbon nanotube (MWCNT)-coated cellulose fibers with a unique sensing ability were manufactured by a simple dip coating process. The formation of electrically-conducting MWCNT networks on cellulose mono-and multi-filament fiber surfaces was confirmed by electrical resistance measurements and visualized by scanning electron microscopy. The interaction between MWCNT networks and cellulose fiber was investigated by Raman spectroscopy. The piezoresistivity of these fibers for strain sensing was investigated. The MWCNT-coated cellulose fibers exhibited a unique linear strain-dependent electrical resistance change up to 18% strain, with good reversibility and repeatability. In addition, the sensing behavior of these fibers to volatile molecules (including vapors of methanol, ethanol, acetone, chloroform and tetrahydrofuran) was investigated. The results revealed a rapid response, high sensitivity and good reproducibility for these chemical vapors. Besides, they showed good selectivity to different vapors. It is suggested that the intrinsic physical and chemical features of cellulose fiber, well-formed MWCNT networks and favorable MWCNT-cellulose interaction caused the unique and excellent sensing ability of the MWCNT-coated cellulose fibers, which have the potential to be used as smart materials.

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Structural physico-chemistry of cellulose macromolecules. Vibrational spectra and structure of cellulose

Cited by 87 publications

References 7 publications

Direct observation of cellulose dissolution in subcritical and supercritical water over a wide range of water densities (550–1000 kg/m3)

Direct observation of cellulose dissolution in subcritical and supercritical water over a wide range of water densities (550–1000 kg/m3)

Molecular Spectroscopy as an alternative for dating Textiles

Smart Cellulose Fibers Coated with Carbon Nanotube Networks

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