Nanoscale analysis of degradation processes of cellulose fibers

Teodonio, Lorenzo; Missori, Mauro; Pawcenis, Dominika; Łojewska, Joanna; Valle, Francesco

doi:10.1016/j.micron.2016.07.013

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…This It also suggests that some THz vibrational modes can be modified as degradation-induced structural modifications take place. Since degradation primarily happens in the amorphous regions [24], the observed THz spectral changes could be associated to the modification of vibrational modes in the recrystallized amorphous regions but also to the progressive degradation of the external surfaces of the crystalline domains, with a consequent enhancements of finite size effects in the phononic modes.…”

Section: Resultsmentioning

confidence: 99%

“…Modern paper samples, obtained from the Netherlands Organization for Applied Scientific Research (TNO), are made of unbleached cotton linters, containing very low inorganic ingredients (ash content <0.005% in weight) and no additives or lignin [24]. They were artificially aged up to 47 days in closed vials (in air) at a relative humidity RH= 59 % and a temperature T = 90…”

Section: Methodsmentioning

confidence: 99%

“…Such process swallows up the amorphous regions where both reactions proceed. In fact, at a macroscopic scale, degradation appears as a weakening of the mechanical properties of cellulose artifacts [24].…”

Section: Introductionmentioning

confidence: 99%

“…Further, THz spectroscopy is an alternative method to X-ray diffraction to assess sample crystallinity [22]. Specifically, this is crucial for ancient paper artifacts where crystallinity strongly influences mechanical properties and durability [24].…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Absorption by Cellulose: Application to Ancient Paper Artifacts

et al. 2017

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Artifacts made of cellulose, such as ancient documents, pose a significant experimental challenge in the THz transmission spectra interpretation due to their small optical thickness. In this Letter we describe a method to recover the complex refractive index of cellulose fibers from the THz transmission data obtained on single freely standing paper sheets in the 0.2-3.5 THz range. By using our technique, we were able to eliminate Fabry-Perot effects and recover the absorption coefficient of the cellulose fibers. The obtained THz absorption spectra are explained in terms of absorption peaks of the cellulose crystalline phase superimposed to a background contribution due to a disordered hydrogen bonds network. The comparison between the experimental spectra with THz vibrational properties simulated by density functional theory calculations confirms this interpretation. In addition, evident changes in the THz absorption spectra are produced by natural and artificial aging on paper samples, whose final stage is characterized by a spectral profile with only two peaks at about 2.1 THz and 3.1 THz. These results could be used to provide a quantitative assessment of the state of preservation of cellulose artifacts.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terahertz Absorption by Cellulose: Application to Ancient Paper Artifacts

et al. 2017

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“…On another hand, acetic acid is an important compound for the monitoring of cellulose acetate films [3]. A huge percentage of the recent cultural heritage can be found in movies, photographs, posters and slides produced between 1895 and 1970 were made using cellulose derivate [4,5]. More than 75 years of visual and audio memories are in serious danger to be lost due to the natural instability of cellulose acetate.…”

Section: Introductionmentioning

confidence: 99%

ZnO/polyaniline composite based photoluminescence sensor for the determination of acetic acid vapor

Turemis

Zappi

Giardi

et al. 2020

Talanta

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In this study, we report a novel ZnO/polyaniline (PANI) nanocomposite optical gas sensor for the determination of acetic acid at room temperatures. ZnO nanorods, synthesized in powder form were coated by PANI (ZnO/ PANI) by chemical polymerization method. The obtained nanocomposites were deposited on glass substrate and dried overnight at room temperature. Structure and optical properties of ZnO/PANI nanocomposite have been studied by using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, diffuse reflectance and photoluminescence spectroscopy. Tests towards acetic acids were performed in the range of concentrations 1-13 ppm. The adsorption of acetic acid on the sensor's surface resulted in the decrease of ZnO/ PANI photoluminescence. The response and recovery time of the sensor were in the range of 30-50 s and 5 min, respectively. The developed sensors showed sensitivity towards acetic acid in a range of 1-10 ppm with the limit of detection of 1.2 ppm. Specially designed miniaturized sensing system based on integrated sensing layer, light emission diode as excitation source and optical fiber spectrometer was developed for the measurement of the sensor signal. The developed sensing system was applied for the investigation of some real sample assessment including the evaluation of storage conditions of ancient cellulose acetate films, which during the degradation are releasing acetic acid. The obtained results suggest that the developed novel optical ZnO/PANI nanocompsite based sensor shows great potential for acetic acid determination in various samples.

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