The effects of deuteration-levels in solution and temperature on the segregation coefficient of the deuterium content in rapid-grown K(DxH1−x)2PO4 crystals via Raman spectroscopy

CrystEngComm ◽  
2020 ◽  
Vol 22 (21) ◽  
pp. 3664-3669
Author(s):  
Jinxin Huang ◽  
Zongqi Wang ◽  
Bing Teng ◽  
Hong Liu ◽  
Xixi Zheng ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Deuterium Content ◽  
Segregation Coefficient ◽  
First Time

The correlation between the deuterium segregation coefficient and temperature, and the deuterium content in a solution was studied for the first time.

S-Edge-rich MoxSy arrays vertically grown on carbon aerogels as superior bifunctional HER/OER electrocatalysts

Nanoscale ◽  
2019 ◽  
Vol 11 (42) ◽  
pp. 20284-20294 ◽  
Author(s):  
Yu Cheng ◽  
Pengfei Yuan ◽  
Xiaohui Xu ◽  
Sijie Guo ◽  
Kanglei Pang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Active Sites ◽  
Structural Changes ◽  
Carbon Aerogels ◽  
Clear Identification ◽  
First Time

Operando Raman spectroscopy is used for the first time for clear identification of the intrinsic active sites, intermediates and structural changes in Mo4S16@GCA.

scholarly journals Nanoscale mapping of newly-synthesised phospholipid molecules in a biological cell using tip-enhanced Raman spectroscopy

2017 ◽  
Vol 53 (16) ◽  
pp. 2451-2454 ◽  
Author(s):  
Naresh Kumar ◽  
Marek M. Drozdz ◽  
Haibo Jiang ◽  
Daniela M. Santos ◽  
David J. Vaux
Keyword(s):  
Raman Spectroscopy ◽  
Biological Cell ◽  
Label Free ◽  
Tip Enhanced Raman Spectroscopy ◽  
First Time ◽  
Non Destructive

Non-destructive & label-free nanoscale mapping of newly-synthesised phospholipid molecules inside a biological cell is demonstrated using tip-enhanced Raman spectroscopy for the first time.

Refinement of the layered titanosilicate AM-1 from single-crystal X-ray diffraction data

2007 ◽  
Vol 63 (11) ◽  
pp. i186-i186 ◽  
Author(s):  
Stanislav Ferdov ◽  
Uwe Kolitsch ◽  
Christian Lengauer ◽  
Ekkehart Tillmanns ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Single Crystal ◽  
Single Crystals ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Ir And Raman ◽  
Bonding Scheme

The structure of the layered noncentrosymmetric titanosilicate AM-1 (also known as JDF-L1, disodium titanium tetrasilicate dihydrate), Na4Ti2Si8O22·4H2O, grown as small single crystals without the use of organics, has been refined from single-crystal X-ray diffraction data. The H atom has been located for the first time, and the hydrogen-bonding scheme is also characterized by IR and Raman spectroscopy. All atoms are in general positions except for the Na, the Ti, one Ti-bound O, one Si-bound O and the water O atoms (site symmetries 2, 4, 4, 2 and 2, respectively).

Synthesis, single-crystal structure determination and Raman spectrum of Cu[C(CN)3]2·2 NH3

2015 ◽  
Vol 70 (3) ◽  
pp. 177-181
Author(s):  
Olaf Reckeweg ◽  
Armin Schulz ◽  
Francis J. DiSalvo
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Single Crystals ◽  
Structure Determination ◽  
Aqueous Ammonia ◽  
Ambient Conditions ◽  
Light Blue ◽  
Cell Parameters ◽  
First Time

AbstractTransparent, light blue crystals of Cu[C(CN)3]2·2 NH3 were obtained by dissolving Cu[C(CN)3]2 in aqueous ammonia and subsequent evaporation of the solvent under ambient conditions. Cu[C(CN)3]2·2 NH3 crystallizes in the space group C2/c (no. 15, Z = 4) with the cell parameters a = 1291.9(3), b = 753.18(15) and c = 1200.8(2) pm, and β = 92.68(3)°. The nature of the tricyanomethanide anion and the ammonia molecules were verified by Raman spectroscopy. Single crystals of Ag[C(CN)3] and Cu[C(CN)3]2 were synthesized, the known structures were confirmed and their Raman spectra were recorded for the first time for comparison.

X-Ray and Raman Investigations on Cyanides ofMono- and DivalentMetals and Synthesis, Crystal Structure and Raman Spectrum of Tl5(CO3)2(CN)

2002 ◽  
Vol 57 (8) ◽  
pp. 895-900 ◽  
Author(s):  
Olaf Reckeweg ◽  
Arndt Simon
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Single Crystal ◽  
Aqueous Ammonia ◽  
Ammonia Solution ◽  
Aqueous Ammonia Solution ◽  
Divalent Metals ◽  
X Ray ◽  
First Time

Pseudobinary cyanides of monovalent and divalent metals were synthesized, and X-ray and Raman data of the cyanides were measured. Single crystal X-ray structure analyses were performed on Zn(CN)2 (Pn3̄m (No. 224), a = 591.32(7) pm), Hg(CN)2 (I4̄2d (No. 122), a = 969.22(14) and c = 890,15(18) pm) and for the first time on AgCN (I4̄2d (No. 166), a = 600.58(8) and c = 526.28(11) pm). The data are compared with literature data. The reaction of TlF and NaCN in 25% aqueous ammonia solution in air led to Tl5(CO3)2(CN) which was characterized by X-ray (Cmca (No. 64), 1468.1(3), 1171.6(2) and 1266.0(3) pm) and Raman spectroscopy.

Raman Spectra of Human Dental Calculus

1993 ◽  
Vol 72 (12) ◽  
pp. 1609-1613 ◽  
Author(s):  
H. Tsuda ◽  
J. Arends
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Octacalcium Phosphate ◽  
Spot Size ◽  
Spectral Features ◽  
Dental Calculus ◽  
Micro Raman Spectroscopy ◽  
Vibrational Bands ◽  
First Time ◽  
Mineral Constituents

Raman spectra of human dental calculus have been observed for the first time by use of micro-Raman spectroscopy. The spectral features of calculus were influenced easily by heating caused by laser irradiation. Therefore, the measurements were carried out at relatively low power (5 mW, 1-μm spot size). The spectra could be characterized as phosphate vibrational bands due to the v1, v2, v 3, and v4 modes. The overall spectral features did not resemble those of pure minerals such as brushite, octacalcium phosphate, and hydroxyapatite. There were spectral differences among mixed calculus particles obtained from 18 adults, probably due to variations in local mineral composition and differences among patients. However, the averaged spectral features did not vary significantly with formation period from 1 to 6 months. Freshly removed and stored (5-11 months) calculus also gave comparable Raman spectra. Measurements on a fractured sample indicated that Raman spectra at saliva and dentin interfaces are nearly identical, and major mineral constituents may not vary significantly along the growth axis of calculus.

Nachweis der isotopomeren closo-Hydrohexaborate 11Bn10B6-nH62- , n = 0—6, durch Tieftemperatur-Raman-Spektroskopie / Detection of the Isotopomeric closo-Hydrohexaborates 11Bn10B6-nH62- , n = 0—6, by Low Temperature Raman Spectroscopy

1989 ◽  
Vol 44 (2) ◽  
pp. 121-126 ◽  
Author(s):  
W. Preetz ◽  
J. Thesing
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Raman Spectra ◽  
Abundance Ratio ◽  
Geometric Isomers ◽  
First Time

Abstract The low temperature Raman spectra (10 K) of Cs2B6H6 and its 11B and 10B enriched derivatives prepared for the first time show well resolved signals o f the B6-cage vibrations υ1 (A1g), υ3(Eg) and υ9(T2g) for all isotopomers 11B10B6-nH62 -, n = 0-6. The intensities o f the sharp peaks correlate exactly with the statistical abundance ratio. W hereas the frequency decreases by nearly equidistant steps of 7 cm-1 with increasing n values, the geometric isomers for n = 2, 3 and 4 are separated by only about 2 cm-1. The band assignments are verified by Teller-Redlich calculations.

3D-reconstruction of chemical state distributions in stratified samples by spatially resolved micro-X-ray resonant Raman spectroscopy

2017 ◽  
Vol 32 (2) ◽  
pp. 402-407 ◽  
Author(s):  
J. J. Leani ◽  
R. D. Pérez ◽  
J. I. Robledo ◽  
H. J. Sánchez
Keyword(s):  
Raman Spectroscopy ◽  
Raman Scattering ◽  
3D Reconstruction ◽  
Chemical State ◽  
X Ray ◽  
Multilayer Sample ◽  
Spatially Resolved ◽  
Resonant Raman ◽  
Resonant Raman Scattering ◽  
First Time

X-ray resonant Raman scattering was used, for the first time, in a confocal setup with the aim of determining different compounds of the same element in a copper-multilayer sample.

Heating Effects of Desi Ghee Using Raman Spectroscopy

2018 ◽  
Vol 72 (6) ◽  
pp. 833-846 ◽  
Author(s):  
Naveed Ahmad ◽  
Muhammad Saleem ◽  
Mushtaq Ahmed ◽  
Shaukat Mahmood
Keyword(s):  
Principal Component Analysis ◽  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Principal Component ◽  
Nondestructive Technique ◽  
Molecular Changes ◽  
Spectral Bands ◽  
Heating Effects ◽  
Excitation Laser ◽  
First Time

Raman spectroscopy as a fast and nondestructive technique has been used to investigate heating effects on Desi ghee during frying/cooking of food for the first time. A temperature in the range of 140–180℃ has been investigated within which Desi ghee can be used safely for cooking/frying without much alteration of its natural molecular composition. In addition, heating effects in case of reuse, heating for different times, and cooking inside pressure cookers are also presented. An excitation laser at 785 nm has been used to obtain Raman spectra and the range of 540–1800 cm−1 is found to contain prominent spectral bands. Prominent variations have been observed in the Raman bands of 560–770 cm−1, 790–1160 cm−1, and 1180–1285 cm−1 with the rise in temperature. The spectral variations have been verified using classifier principal component analysis. It has been found that Desi ghee can be reused if heated below 180℃ and it can be heated up to 30 min without any appreciable molecular changes if a controlled heating can be managed.

scholarly journals Palladium tellurides and bismuthtellurides in sulfide copper-nickel ores of the Savabeisky ore occurrence (Nenets Autonomous District, Russsia)

LITOSFERA ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 574-594
Author(s):  
R. I. Shaybekov ◽  
B. A. Makeev ◽  
N. N. Kononkova ◽  
S. I. Isaenko ◽  
E. M. Tropnikov
Keyword(s):  
Raman Spectroscopy ◽  
Noble Metals ◽  
Electron Backscatter Diffraction ◽  
Integrated Approach ◽  
Analysis Data ◽  
X Ray ◽  
Copper Nickel ◽  
North East ◽  
Nickel Ores ◽  
First Time

Research subject. The Savabeisky sulfide copper-nickel ore occurrence, located in the central part of the Khengur (Central Pay-Khoy) gabbro-dolerite complex of the Pay-Khoy, within the Yugorsky Peninsula, located in the Far North-East of the European part of Russia, in the Arkhangelsk region, between the Barents and Kara Seas.Materials and methods. Samples of copper-nickel ores with noble metal mineralization were studied. Palladium tellurides and bismuthtellurides were characterized using optical and scanning electron microscopy, electron backscatter diffraction (EBSD), X-ray structural analysis and Raman spectroscopy.Results. Bismuthtellurides in the Paykhoysko-Vaigach-Yuzhnonovozemelskiy region – michenerite, merenskyite and unidentified palladium telluride of the kotulskite–merenskyite series with crystal formula Pd2(TeSbBi)3 – were found for the first time. The unit cell parameter of Pay-Khoy michenerite was calculated using X-ray diffraction analysis data: a = 6.638(2) Å. According to Raman spectroscopy, the palladium tellurides and bismuthtellurides of the Savabeisky ore occurrence were distinguished into 4 groups: Sb-kotulskite (does not contain Raman-active modes), unnamed PGM Pd2(TeSbBi)3 (bands in the range 95–103, 121–126 cm–1, obtained for the first time), Sb-merenskyite (band 126–135 cm–1), michenerite (bands with maxima 100 and 116 cm–1, obtained for the first time). The Kikuchi lines for michenerite and the mineral of the kotulskite–merenskyite series were obtained by the EBSD method.Conclusions. The diagnosis of palladium tellurides and bismuthtellurides is a rather complicated problem (wide variations in compositions, low hardness, small size, thin intergrowths of several individuals, the presence of impurities, etc.) affecting the determination of their mineral form and requiring an integrated approach. The Raman spectra of michenerite and unnamed PGM can be used as standards for the rapid identification of their natural forms, in contrast to EBSD, which requires improved sample preparation. The relatively high content of antimony in the ore minerals and noble metals minerals at the Savabeisky ore occurrence is the antimony metallogenic specificity characteristic of the entire Uralsko-Novozemelskiy province.

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