Vibrational Spectra of Copper Sulfate Hydrates Investigated with Low-Temperature Raman Spectroscopy and Terahertz Time Domain Spectroscopy

Fu, Xiaojian; Yang, Guang; Sun, Jingbo; Zhou, Ji

doi:10.1021/jp302997h

Cited by 50 publications

(38 citation statements)

References 20 publications

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“…As a matter of fact, the amplitude of the transmission terahertz time-domain signal is proportional to the water content. In CuSO 4 ·5H 2 O, crystal water molecules either coordinate with copper ions or form hydrogen bonds 30 . The variances of terahertz absorptions are mainly caused by two contributions.…”

Section: Resultsmentioning

confidence: 99%

Insights into the water status in hydrous minerals using terahertz time-domain spectroscopy

Huang

Hao

et al. 2019

Sci Rep

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The determinations of water status incorporated in hydrous minerals are of considerable significances in geoscience fields. Coincidentally, the aqueous sensitivity of terahertz radiation has motivated numerous explorations in several cross-domain applications. Terahertz time-domain spectroscopy is employed as a major probing technique coupling of traditional detecting methods to uncover the mask of water status in copper sulfate pentahydrate as well as mineral quartz in this article. Based on the quantitative identification of water status in copper sulfate pentahydrate, the water incorporated in mineral quartz is verified qualitatively. Notable differences of optical constants originating from the water content are obtained for copper sulfate pentahydrate and mineral quartz. These present works indicate that terahertz technology can be considered as a promising method to satisfy the ever-increasing requirements in hydrous mineral analyses.

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Section: Resultsmentioning

confidence: 99%

Insights into the water status in hydrous minerals using terahertz time-domain spectroscopy

Huang

Hao

et al. 2019

Sci Rep

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“…Here, a carbon atom existing in a benzene ring is referred to as C α . If this is the case, the absorption at around 3.2 THz (= 107 cm −1 ) could be attributed to such intramolecular vibrations, although THz absorption peaks are very often assigned to weak intermolecular vibrations such as lattice vibrations …”

Section: Discussionmentioning

confidence: 99%

“…57 If this is the case, the absorption at around 3.2 THz (5 107 cm 21 ) could be attributed to such intramolecular vibrations, although THz absorption peaks are very often assigned to weak intermolecular vibrations such as lattice vibrations. [58][59][60] As were employed in this research, there are several methods that can estimate the crystallinity of a polymer such as density measurement, XRD, FTIR, and thermal analyses like DSC. Each method has its pros and cons.…”

Section: Discussionmentioning

confidence: 99%

Terahertz spectroscopic estimation of crystallinity of poly(phenylene sulfide)

Azeyanagi

Ohki

2018

J of Applied Polymer Sci

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As a crystalline polymer, various properties of poly(phenylene sulfide) (PPS) depend on its crystallinity. Evaluation of crystallinity of PPS is examined by terahertz (THz) absorption spectroscopy in this research. For sheets of PPS thermally annealed differently, sharp absorption peaks appearing at 3.2 and 4.2 THz are well proportional to the crystallinity estimated by X‐ray diffraction, differential scanning calorimetry, and Fourier transform infrared (FTIR) absorption spectroscopy. Therefore, THz absorption spectroscopy can be a good tool for estimating the crystallinity of PPS. Especially, it is useful for thick PPS sheets, for which FTIR spectroscopy in transmission mode is difficult to apply due to the saturation of absorbance. Since THz spectroscopy and FTIR spectroscopy are complementary in the vibrations that the two methods can detect, using the two methods should be effective to improve the accuracy of estimation of crystallinity. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46427.

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“…Soil element markers such as Si, Mg, Ca, Al, and Fe are also common in archaeological silver artefacts since these elements usually interact with corrosion products of the buried artefacts29. Nevertheless, the presence of Cl and S in silver joints often provides a hint as to the type of compound that was used during the joining process4950.…”

Section: Discussionmentioning

confidence: 99%

“…In antiquity it was possible to produce silver-silver joints by adding a copper compound plus organic slurry-glue to the joining zone, followed by the heat reduction to a copper interlayer, forming dedicated joints, depending on the process conditions43. Different copper compounds could have been used to create metallic copper layers on the silver surface: (1) powdered Malachite mineral, Cu 2 (OH) 2 CO 3 , was used according to Pliny the elder3239444546; (2) cupric oxide (CuO) black powder, produced by grinding the oxide formed on the copper surface after annealing464748; (3) copper chloride dehydrate, CuCl 2 (H 2 O) 2 , obtained by annealing a copper sheet painted with salt4849; and (4) Chalcanthite mineral (CuSO 4 ·5H 2 O)4850.…”

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confidence: 99%

Metallurgical investigation on fourth century BCE silver jewellery of two hoards from Samaria

Ashkenazi

Gitler²,

Stern

et al. 2017

Sci Rep

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A fourth century BCE silver jewellery collection, which is part of two hoards of Samarian coins (the Samaria and Nablus Hoards), was studied by non-destructive analyses. The collection, which consists of pendants, rings, beads and earrings, had been examined by visual testing, multi-focal microscopy and SEM-EDS analysis. In order to enhance our knowledge of past technologies of silver jewellery production, we developed a metallurgical methodology based on the chemical composition of the joints and bulk. The results show that all artefacts are made of silver containing a small percentage of copper. Higher copper concentrations were measured in the joining regions. Our research indicates that the manufacturing of the jewellery from both hoards involved similar techniques, including casting, cutting, hammering, bending, granulating and joining methods, indicating that the artefacts were made by trained silversmiths. Although the burial date of the Samaria Hoard – 352 BCE – is some 21 years earlier than that of the Nablus Hoard – circa 331 BCE, a noted continuity in the local production technology is apparent in the analysed items. This information provides better understanding of the technological abilities in the late Persian-period province of Samaria and bears implications on the local silver coins produced in the region.

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Vibrational Spectra of Copper Sulfate Hydrates Investigated with Low-Temperature Raman Spectroscopy and Terahertz Time Domain Spectroscopy

Cited by 50 publications

References 20 publications

Insights into the water status in hydrous minerals using terahertz time-domain spectroscopy

Insights into the water status in hydrous minerals using terahertz time-domain spectroscopy

Terahertz spectroscopic estimation of crystallinity of poly(phenylene sulfide)

Metallurgical investigation on fourth century BCE silver jewellery of two hoards from Samaria

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