Lignin Content in Paper Fibers Assessed Using IR Reflectance Spectroscopy

AbstractThe mineral conichalcite from the western part of Bagdad mine, Bagdad, Eureka District, Yavapai County, Arizona, USA has been characterized by electronic, near-infrared (NIR), Raman and infrared (IR) spectroscopy. Scanning electron microscopy (SEM) images show that the mineral consists of bundles of fibres. Calculations based on the results of the energy dispersive X-ray analyses on a stoichiometric basis show the substitution of arsenate by 12 wt.% of phosphate in the mineral. Raman and IR bands are assigned in terms of the fundamental modes of AsO43− and PO43− molecules and are related to the mineral structure. Near-IR reflectance spectroscopy shows the presence of adsorbed water and hydroxyl units in the mineral. The Cu(II) coordination polyhedron in conichalcite can have at best pseudo-tetragonal geometry. The crystal field and tetragonal field parameters of the Cu(II) complex were calculated and found to agree well with the values reported for known tetragonal distortion octahedral complexes.

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Silica structural changes induced by thermal treatment or ionic implantation as probed by IR reflectance spectroscopy

Journal of Applied Physics ◽

10.1063/1.3223326 ◽

2009 ◽

Vol 106 (6) ◽

pp. 063512 ◽

Cited By ~ 7

Author(s):

N. Bibent ◽

A. Faivre ◽

G. Ferru ◽

J.-L. Bantignies ◽

S. Peuget

Keyword(s):

Thermal Treatment ◽

Structural Changes ◽

Reflectance Spectroscopy ◽

Ir Reflectance ◽

Ionic Implantation

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Cross-linked Chitosan and Poly(allyl amine) Thin Films

MRS Proceedings ◽

10.1557/proc-750-y9.5 ◽

2002 ◽

Vol 750 ◽

Cited By ~ 1

Author(s):

Caroline L. Schauer ◽

Paul E. Schoen ◽

Frances S. Ligler

Keyword(s):

Thin Films ◽

Layered Materials ◽

Reflectance Spectroscopy ◽

Medical Diagnostics ◽

Index Of Refraction ◽

Soluble Form ◽

Software Modeling ◽

Light Refraction ◽

Ir Reflectance ◽

Allyl Amine

ABSTRACTThe alternation of chitin layers with various compounds allows nature to create novel materials with selective refractive properties. Various organisms employ layered materials for survival; for example, in butterflies such materials cause the apparent disappearance and reappearance during flight to evade predators. The selective light refraction is achieved through control of the thickness and index of refraction of the multiple layers. With the ultimate goal of reproducing these layers, thin single films of chitosan, the soluble form of chitin, and poly(allyl amine) have been prepared and their optical properties analyzed. Ellipsometry, reflectance IR, reflectance spectroscopy, SEM and software modeling were used to characterize these films. Possible applications for optical layered materials range from medical diagnostics to environmental monitoring.

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On the mechanism of ethanol electro-oxidation on Pt and PtSn catalysts: electrochemical and in situ IR reflectance spectroscopy studies

Journal of Electroanalytical Chemistry ◽

10.1016/j.jelechem.2003.08.019 ◽

2004 ◽

Vol 563 (1) ◽

pp. 81-89 ◽

Cited By ~ 410

Author(s):

F. Vigier ◽

C. Coutanceau ◽

F. Hahn ◽

E.M. Belgsir ◽

C. Lamy

Keyword(s):

Reflectance Spectroscopy ◽

In Situ Ir ◽

Ir Reflectance ◽

Electro Oxidation ◽

Spectroscopy Studies ◽

Ptsn Catalysts

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Near-IR Reflectance Spectroscopy for the Determination of Motor Oil Contamination in Sandy Loam

Applied Spectroscopy ◽

10.1366/0003702963906221 ◽

1996 ◽

Vol 50 (3) ◽

pp. 334-338 ◽

Cited By ~ 26

Author(s):

Brian R. Stallard ◽

Manuel J. Garcia ◽

Sumanth Kaushik

Keyword(s):

Organic Contaminants ◽

Sandy Loam ◽

Sampling Error ◽

Reflectance Spectroscopy ◽

Oil Contamination ◽

Motor Oil ◽

Near Ir ◽

Ir Reflectance ◽

The One

We have investigated the application of near-IR reflectance spectroscopy to the determination of motor oil contamination in sandy loam. Although the present work is concerned with a specific case of contamination, we discuss the possibility of applying the method to other organic contaminants and other types of soil. The spectral region considered was 1600–1900 nm, which contains the first overtone of the CH stretch. Using a commercial Fourier transform spectrometer together with cross-validated partial least-squares data analysis, the one-sigma precision for the determination of motor oil in sandy loam was 0.17 wt % (0.13 to 0.26 wt % at the 95% confidence level). The largest contribution to the precision of the determination was sampling error, or inhomogeneity in each sample. Given the precision limit imposed by the sampling error, we found that the performance of the spectrometer could be lowered without affecting the overall precision. In a modeling exercise, adequate performance was obtained with a spectrometer having only seven spectral channels with a spectral resolution of 10 nm and a spectral noise level of 10−3 absorbance units. A design for an inexpensive miniature instrument is presented.

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