Quantitative diagnostics of ancient paper using THz time-domain spectroscopy

Missori, Mauro; Pawcenis, Dominika; Bagniuk, J.; Conte, Adriano Mosca; Violante, C.; Maggio, Mary S.; Peccianti, Marco; Pulci, Olivia; Łojewska, Joanna

doi:10.1016/j.microc.2018.06.010

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…In the region around 3 THz, another not intense peak can be appreciated, barely distinguishable from the noise. As reported in [53], the spectroscopic features of CEL around 3 THz depend on the cellulose water content. The CEL, equilibrated at a relative humidity RH = 47.7% , presents well-defined bands at approximately 2.6 and 3 THz.…”

Section: βLa Cbs and Celmentioning

confidence: 58%

Low-Frequency Vibrations of Saccharides Using Terahertz Time-Domain Spectroscopy and Ab-Initio Simulations

Paraipan,

Luchetti,

Mosca Conte

et al. 2023

Applied Sciences

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The vibrational properties of molecular crystals in the terahertz range are controlled by the interplay of intermolecular and intramolecular interactions. The resulting delocalized normal modes span a substantial number of atoms within the unit cell of the molecular crystals and cannot be easily attributed to a specific stretching or bending mode. Several compounds were studied to understand the nature of normal modes. However, a systematic analysis of saccharides is still missing. This study investigates the terahertz vibrational properties of various saccharides, including glucose, galactose, lactose, cellobiose, and cellulose. The terahertz spectra were measured using terahertz time-domain spectroscopy. The samples were carefully characterized, and the residual Fabry–Perot oscillations were removed to obtain the absorption coefficient and refractive index of the saccharides. Density functional theory simulations were used to obtain theoretical terahertz spectra, considering hydrogen bonding interactions with an enhanced version of the van der Waals non-local density functional. The results revealed differences in low-energy vibrational modes frequencies, influenced by molecular structure properties, hydrogen bonding networks, and water content. Librations and internal vibrations were identified as dominant dynamics in the saccharides, with significant mixing between intermolecular and intramolecular vibrations. This comprehensive analysis sheds light on the vibrational behavior of saccharides in the terahertz range.

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Section: βLa Cbs and Celmentioning

confidence: 58%

Low-Frequency Vibrations of Saccharides Using Terahertz Time-Domain Spectroscopy and Ab-Initio Simulations

Paraipan,

Luchetti,

Mosca Conte

et al. 2023

Applied Sciences

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“…For optically inhomogeneous media such as parchment, which is made of a collection of non-uniformly sized rough-surfaced collagen fibers, S varies smoothly with the wavelength and can be considered constant within the studied UV-Vis-NIR spectral range [45]. In addition, c is proportional to the volume fraction of collagen fibers within the samples and, therefore, to the density of the samples [47].…”

Section: Uv-vis-nir Reflectance Spectroscopymentioning

confidence: 99%

Effect of X-ray and artificial aging on parchment

et al. 2021

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In this study, the employment of the X-ray irradiation as bioremediation method to treat parchment has been deeply investigated. In particular, the effect of the irradiation doses on the structural stability of collagen, the main constituent of parchment, has been evaluated on a series of modern parchment samples by means of different opto-thermal and spectroscopic techniques in order to obtain the dose-dependent effect of irradiation on collagen. Moreover, the long-term behavior of the irradiated parchment has been considered by analyzing the same series of samples after being hygrothermally artificially aged. Characterizations by light transmission analysis, Fourier transform infrared spectroscopy and the ultraviolet–visible–near infrared (UV–Vis–NIR) reflectance one have been performed for the identification of the radio-induced effect on the parchment structure even in a dose range much wider than the need for sterilization. The obtained results have proved the safeness of the method in the short and long term confirming the applicability of this emerging procedure.

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“…In 2017, a correlation was found between the THz absorption peaks of fibers and the variation of H-bond network and crystalline regions and applying this feature to detect the aged condition of ancient paper and fiber products was proposed. In 2018 [ 35 ], Italian scholar M. Missouri also conducted a study on the polymerization degree and THz spectral absorption coefficients of ancient paper and quantified the relationship [ 36 ]. Therefore, the advantages of THz waves including a unique response to molecular low-energy vibrations and good penetrability to weakly polar substances [ 37 ], make THz-TDS promising for overcoming the limitations of conventional spectroscopic methods and pave the way for rapid, non-destructive detection of the DP.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Measurements of DP in Cellulose Paper Based on Terahertz Spectroscopy

Chen¹,

Yang²,

et al. 2023

Polymers

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The power transformer is vital to the reliability of the power grid which is most commonly insulated with Kraft paper and immersed in mineral oil, among which the aged state of the paper is mainly correlated to the operating life of the transformer. Degree of polymerization (DP) is a direct parameter to assess the aged condition of insulating paper, but existing DP measurement by viscosity methods are destructive and complicated. In this paper, terahertz time-domain spectroscopy (THz-TDS) was introduced to reach rapid, non-destructive detection of the DP of insulating paper. The absorption spectra of insulating paper show that characteristic peak regions at 1.8 and 2.23 THz both exhibit a log-linear quantitative relationship with DP, and their universalities are confirmed by conducting the above relationship on different types of insulating paper. Fourier transform infrared spectroscopy (FTIR) analysis and molecular dynamics modeling further revealed that 1.8 and 2.23 THz were favorably associated with the growth of water–cellulose hydrogen bond strength and amorphous cellulose, respectively. This paper demonstrates the viability of applying THz-TDS to the non-destructive detection of DP in insulating paper and assigned the vibration modes of the characteristic absorption peaks.

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Quantitative diagnostics of ancient paper using THz time-domain spectroscopy

Cited by 10 publications

References 38 publications

Low-Frequency Vibrations of Saccharides Using Terahertz Time-Domain Spectroscopy and Ab-Initio Simulations

Low-Frequency Vibrations of Saccharides Using Terahertz Time-Domain Spectroscopy and Ab-Initio Simulations

Effect of X-ray and artificial aging on parchment

Quantitative Measurements of DP in Cellulose Paper Based on Terahertz Spectroscopy

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