Terahertz time-domain and Fourier-transform infrared spectroscopy of traditional Korean pigments

Hong, Taeyoon; Choi, Kyujin; Ha, Taewoo; Park, Byung Cheol; Sim, Kyung Ik; Kim, Jong Hyeon; Kim, Jae-Hoon; Kwon, Jy Eun; Lee, Sang‐Hyun; Kang, Dai Ill; Lee, Han Hyoung

doi:10.3938/jkps.64.727

Cited by 27 publications

(15 citation statements)

References 17 publications

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“…The analysis of the properties of additive-treated and surfacemodified fillers is an important factor during the synthesis and in their final use. Since the THz spectral pattern depends on the crystal structure and the presence of impurities or additives it is expected that small spectral features may occur in the THz spectrum of additive-treated and surface-modified calcite samples [35]. The particles of C-SA powder are in a form of rhombohedra what was also confirmed by SEM (Fig.…”

Section: Analysis Of Treated and Untreated Calcium Carbonate Microfilmentioning

confidence: 72%

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Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Abina

Puc

Jeglic

et al. 2015

Talanta

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Section: Analysis Of Treated and Untreated Calcium Carbonate Microfilmentioning

confidence: 72%

“…4a and b. The particle scattering becomes significant with increasing frequency due to the particle size that becomes comparable to the wavelength of THz radiation [35].…”

Section: Influence Of Microfiller Granulation On Terahertz Spectrummentioning

confidence: 99%

Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Abina

Puc

Jeglic

et al. 2015

Talanta

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“…The refractive indices of various lead carbonates and oxides at THz frequencies have not yet been reported. A value for the refractive index of ground massicot pigment in an animal-glue binder is 1.50 29 . This is an effective value for the dried paint, and the actual value for massicot is likely substantially larger.…”

Section: Resultsmentioning

confidence: 99%

Revealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging

Ribeiro¹,

Vacheret²,

Locquet

et al. 2022

Sci Rep

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The presence of a corrosion layer on lead art and archæological objects can severely impede the interpretation of inscriptions, thus hampering our overall understanding of the object and its context. While the oxidation of lead that dominates corrosion may be chemically reversible via reduction, potentially providing some access to inscriptions otherwise obscured by time, corrosion damage is overall neither entirely reversible nor is the reduction process in all cases easy or feasible to carry out. In this study, by taking advantage of the unique penetration ability of terahertz radiation and the abundant frequency bands covered by a single-cycle terahertz pulse, we perform nondestructive terahertz multispectral imaging to look under the corrosion on a sixteenth century lead funerary cross (croix d’absolution) from Remiremont in Lorraine, France. The multispectral images obtained from various terahertz frequency bands are fed into a judiciously designed post-processing chain for image restoration and enhancement, thus allowing us for the first time to read obscured inscriptions that might have otherwise been lost. Our approach, which brings together in a new way the THz properties of the constituent materials and advanced signal- and image-processing techniques, opens up new perspectives for multi-resolution analysis at terahertz frequencies as a technique in archæometry and will ultimately provide unprecedented information for digital acquisition and documentation, character extraction, classification, and recognition in archæological studies.

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“…The spectroscopic examination of pigments and their specific fingerprints in the THz region will help researchers understand the source of contrast in the THz frequency parametric images obtained with THz imaging systems, which have been exploited for analysis of artwork. ,− Clarification of the spectral features for individual pigments is an essential component in identification of pigment mixtures used by artists or the degradation of pigments over time. To aid in this understanding, experimental mid-FTIR, Raman, and THz spectral databases of artists’ materials have been constructed − and further spectroscopic examinations of pigments followed. ,− These works demonstrate that individual pigments have unique spectral fingerprints, but accurate interpretation of spectra can be difficult given their complexities. Solid-state density functional theory (ss-DFT) simulations are beneficial in elucidating these measured spectra that are comprised of pure or mixed pigments and indistinguishable by visual inspection .…”

Section: Introductionmentioning

confidence: 99%

“…The visual appearance and crystal structures of these historical pigments are shown in Figure . Previous studies have reported the THz vibrational spectra of these pigments, but no terahertz-focused computational work has appeared for copper carbonate and acetate complexes, though other frequency ranges have been considered. ,− Related computational analyses of the THz spectra of similar copper sulfate compounds and other dyes have been published.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Spectroscopy and Quantum Mechanical Simulations of Crystalline Copper-Containing Historical Pigments

et al. 2019

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Terahertz spectroscopy, a noninvasive and nondestructive analytical technique used in art conservation and restoration, can provide compelling data concerning the composition and condition of culturally valuable and historical objects. Terahertz spectral databases of modern and ancient artists' pigments exist but lack explanations for the origins of the unique spectral features. Solid-state density functional theory simulations can provide insight into the molecular and intermolecular forces that dominate the observed absorption features as well as reveal deviations from simple harmonic vibrational behavior that can complicate these spectra. The characteristic terahertz spectra of solid azurite, malachite, and verdigris are presented here, along with simulations of their crystalline structures and sub-3.0 THz lattice vibrations. The powerful combination of theory and experiment enables unambiguous spectral assignment of these complex materials and highlights the challenges that anharmonic peak broadening in organic-containing materials may present in the construction of reference pigment databases.

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Terahertz time-domain and Fourier-transform infrared spectroscopy of traditional Korean pigments

Cited by 27 publications

References 17 publications

Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Qualitative and quantitative analysis of calcium-based microfillers using terahertz spectroscopy and imaging

Revealing inscriptions obscured by time on an early-modern lead funerary cross using terahertz multispectral imaging

Terahertz Spectroscopy and Quantum Mechanical Simulations of Crystalline Copper-Containing Historical Pigments

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