Comprehensive analysis of cellulose content, crystallinity, and lateral packing in Gossypium hirsutum and Gossypium barbadense cotton fibers using sum frequency generation, infrared and Raman spectroscopy, and X-ray diffraction

Cellulose ◽  
2015 ◽  
Vol 22 (2) ◽  
pp. 971-989 ◽  
Author(s):  
Christopher M. Lee ◽  
Kabindra Kafle ◽  
David W. Belias ◽  
Yong Bum Park ◽  
Richard E. Glick ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Gossypium Hirsutum ◽  
Comprehensive Analysis ◽  
Sum Frequency Generation ◽  
Cotton Fibers ◽  
Cellulose Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sum Frequency ◽  
Infrared And Raman Spectroscopy

scholarly journals Biogenic Orthorhombic α-Calcium Formate from Sediments of Alkali Lake, Oregon, USA

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 448
Author(s):  
Nikita V. Chukanov ◽  
Cesar Menor-Salvan ◽  
Vladislav V. Gurzhiy ◽  
Alina R. Izatulina ◽  
Igor V. Pekov ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Diffraction Analysis ◽  
Anthropogenic Pollution ◽  
Agent Orange ◽  
Low Density ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared And Raman Spectroscopy ◽  
Two Factors ◽  
Calcium Formate

Centimeter-sized crystals of orthorhombic calcium formate, α-Ca(HCO2)2 from Alkali Lake, Oregon, USA have been studied by means of powder and single-crystal X-ray diffraction analysis, infrared, and Raman spectroscopy. Based on the data on carbon isotope abundance in calcium formate and associated minerals, it was concluded that the formation of α-Ca(HCO2)2 may be a result of a combination of two factors: lake microbial metabolism and anthropogenic pollution with Agent Orange. Possible causes of stability of the low-density tetragonal β-Ca(HCO2)2 polymorph (formicaite) in boron ores are discussed.

Étude comparative dans la série des dibenzamido-alcanes, composés modèles des poly(oligométhylènes téréphtalamides)

1985 ◽  
Vol 63 (12) ◽  
pp. 3390-3397 ◽  
Author(s):  
Josée Brisson ◽  
François Brisse
Keyword(s):  
Raman Spectroscopy ◽  
Aromatic Ring ◽  
Torsion Angle ◽  
Amide Group ◽  
Aliphatic Chain ◽  
X Ray Diffraction ◽  
X Ray ◽  
V Band ◽  
Infrared And Raman Spectroscopy ◽  
Ir And Raman

The dibenzamido alcanes, nDBN, for n = 2–10, have been synthesized and characterized by X-ray diffraction and infrared and Raman spectroscopy. From X-ray diffraction it was observed than the dihedral angle ε between the aromatic ring and the amido group averaged 28.3° and did not vary significantly with n. The torsion angle τ between the amide group and the aliphatic chain was found to be near 180° for n = 4, 6, 8, and 10. However, for n = 2, 3, 5, and 7, τ averaged 98°. In this last case the plane of the aliphatic chain is nearly perpendicular to the plane of the amide group. The study of ir and Raman spectra in relation to conformation revealed that the position of the amide V band depends on the value of the τ angle and could be used to infer if the latter is close to 180° or not.

Synthesis, structure, and vibrational spectrum of poly-μ-pyrazine(pyrazine)(trifluoromethanesulfonato-O)copper(I)

1989 ◽  
Vol 67 (11) ◽  
pp. 1964-1969 ◽  
Author(s):  
T. Otieno ◽  
S. J. Rettig ◽  
R. C. Thompson ◽  
J. Trotter
Keyword(s):  
Crystal Structure ◽  
Raman Spectroscopy ◽  
Copper Ions ◽  
Heavy Atom ◽  
X Ray Diffraction ◽  
Full Matrix ◽  
X Ray ◽  
Methanol Solutions ◽  
Infrared And Raman Spectroscopy ◽  
Spectroscopy Studies

Orange–brown crystals of composition Cu(pyz)2(CF3SO3) (pyz = pyrazine, 1,4-diazine) were obtained from methanol solutions containing Cu(CF3SO3)2 and pyrazine in approximate 1:2 mole ratio. Single crystal X-ray diffraction and infrared and Raman spectroscopy studies are reported. Crystals of the title compound are triclinic, a = 8.312(2), b = 10.903(3), c = 8.201(2) Å, α = 92.53(2), β = 113.77(2), γ = 91.40(2)°, Z = 2, space group [Formula: see text] The structure was solved by heavy atom methods and was refined by full-matrix least-squares to R = 0.035 and Rw = 0.044 for 2458 reflections with 1 ≥ 3σ(I). The compound contains chains of copper ions linked by bidentate bridging pyrazine ligands. The coordination around each copper is completed by monodentate pyrazine and trifluoromethanesulfonato groups to produce a distorted tetrahedral CuN3O chromophore. Keywords: crystal structure, μ-pyrazine copper(I) triflate polymer, vibrational spectra.

X-ray diffraction and FTIR investigations of cellulose deposition during cotton fiber development

2017 ◽  
Vol 88 (7) ◽  
pp. 719-730 ◽  
Author(s):  
Noureddine Abidi ◽  
Maheshika Manike
Keyword(s):  
Cell Wall ◽  
Developmental Stages ◽  
Fiber Development ◽  
Primary Cell Wall ◽  
Cotton Fibers ◽  
Cellulose Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cellulose Deposition ◽  
Integrated Intensities

The structure and organization of cellulose in developing cotton fibers harvested from two cultivars of Gossypium hirsutum L. (Texas Marker-1 and TX55) at varying developmental stages from 10 to 56 days post anthesis (dpa) were investigated using wide-angle X-ray diffraction (WAXD) and Fourier transform infrared (FTIR) spectroscopy. During fiber development, the percentage crystallinity and crystallite size normal to the 200 plane increased while the full width at half maximum (FWHM) decreased. This indicates an increased alignment and decreased molecular disorder along the 200 plane as cellulose biogenesis progresses. The evolution of the WAXD parameters as a function of developmental stages provided information on the transition from the primary cell wall to the secondary cell wall and, thus, could indicate the rate of cellulose macromolecules deposition and organization during cellulose biosynthesis. These results were further confirmed by FTIR and cellulose content data. Indeed, IR ratios, cellulose content, and the integrated intensities of the vibrations 667 and 897 cm−1 showed good correlation with the percentage crystallinity. These parameters could be used as good indirect estimators of the percentage crystallinity in developing cotton fibers.

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300○-4.80pt○C

2005 ◽  
Vol 126 ◽  
pp. 101-105 ◽  
Author(s):  
B. Moulin ◽  
L. Hennet ◽  
D. Thiaudière ◽  
P. Melin ◽  
P. Simon
Keyword(s):  
Raman Spectroscopy ◽  
Lithium Niobate ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Quartz Crystallite Size and Moganite Content as Indicators of the Mineralogical Maturity of the Carboniferous Chert: The Case of Cherts from Eastern Asturias (Spain)

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 611
Author(s):  
Celia Marcos ◽  
María de Uribe-Zorita ◽  
Pedro Álvarez-Lloret ◽  
Alaa Adawy ◽  
Patricia Fernández ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallite Size ◽  
Archaeological Sites ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Infrared And Raman Spectroscopy ◽  
First Time ◽  
Geological Formations

Chert samples from different coastal and inland outcrops in the Eastern Asturias (Spain) were mineralogically investigated for the first time for archaeological purposes. X-ray diffraction, X-ray fluorescence, transmission electron microscopy, infrared and Raman spectroscopy and total organic carbon techniques were used. The low content of moganite, since its detection by X-ray diffraction is practically imperceptible, and the crystallite size (over 1000 Å) of the quartz in these cherts would be indicative of its maturity and could potentially be used for dating chert-tools recovered from archaeological sites. Also, this information can constitute essential data to differentiate the cherts and compare them with those used in archaeological tools. However, neither composition nor crystallite size would allow distinguishing between coastal and inland chert outcrops belonging to the same geological formations.

scholarly journals Structural and Raman Vibrational Studies ofCeO2-Bi2O3Oxide System

2009 ◽  
Vol 2009 ◽  
pp. 1-4 ◽  
Author(s):  
L. Bourja ◽  
B. Bakiz ◽  
A. Benlhachemi ◽  
M. Ezahri ◽  
J. C. Valmalette ◽  
...  
Keyword(s):  
Solid Solution ◽  
Raman Spectroscopy ◽  
Phase Changes ◽  
Phase System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vibrational Studies ◽  
Coprecipitation Route

A series of ceramics samples belonging to theCeO2-Bi2O3phase system have been prepared via a coprecipitation route. The crystallized phases were obtained by heating the solid precursors at600∘Cfor 6 hours, then quenching the samples. X-ray diffraction analyses show that forx<0.20a solid solutionCe1−xBixO2−x/2with fluorine structure is formed. For x ranging between 0.25 and 0.7, a tetragonalβ′phase coexisting with the FCC solid solution is observed. For x ranging between 0.8 and 0.9, a new tetragonalβphase appears. Theβ′phase is postulated to be a superstructure of theβphase. Finally, close tox=1, the classical monoclinicα Bi2O3structure is observed. Raman spectroscopy confirms the existence of the phase changes as x varies between 0 and 1.

Sign in / Sign up

Export Citation Format

Share Document