INFRARED SPECTRA OF CALCIUM PHOSPHATE GLASSES

2010 ◽  
Vol 24 (03) ◽  
pp. 351-358 ◽  
Author(s):  
D. TOLOMAN ◽  
D. A. MAGDAS ◽  
I. BRATU ◽  
L. M. GIURGIU ◽  
I. ARDELEAN
Keyword(s):  
Calcium Phosphate ◽  
Ir Spectroscopy ◽  
Experimental Spectrum ◽  
Phosphate Glasses ◽  
Structural Units ◽  
Bending Vibrations ◽  
Ft Ir ◽  
Infrared Absorption Spectra ◽  
Gaussian Type Function ◽  
Ft Ir Spectroscopy

Infrared absorption spectra of calcium phosphate glasses, x CaO ·(100-x) P 2 O 5 have been investigated by FT-IR spectroscopy. By increasing CaO content, the characteristic bands due to the stretching and bending vibrations were identified and analyzed. The deconvolution of each experimental spectrum was made using a Gaussian-type function. Based on this, the specific structural units of these glasses were identified.

FT-IR AND RAMAN SPECTROSCOPIC STUDIES OF xAg2O · (100 - x)[B2O3 · As2O3] GLASS SYSTEM

2010 ◽  
Vol 24 (01) ◽  
pp. 51-58 ◽  
Author(s):  
S. C. BAIDOC ◽  
I. ARDELEAN
Keyword(s):  
Ir Spectroscopy ◽  
Structural Changes ◽  
Spectroscopic Studies ◽  
Glass System ◽  
Structural Units ◽  
Raman Spectroscopic ◽  
Ir And Raman Spectroscopies ◽  
Ft Ir ◽  
Ir And Raman ◽  
Ft Ir Spectroscopy

Structural analysis of x Ag 2 O · (100-x)[ B 2 O 3 · As 2 O 3] glass system, with 0 ≤ x ≤ 10 mol%, was performed by means of FT-IR and Raman spectroscopies. The purpose of this work is to investigate the structural changes that appear in the B 2 O 3 · As 2 O 3 glass matrix with the addition and increase of silver ion content. Boroxol rings, pyro-, ortho-, di-, tri-, tetra- and penta-borate groups, structural units characteristic to As 2 O 3 were found in the structure of the studied glasses. FT-IR spectroscopy measurements show that BO 3 units are the main structural units of the glass system. The presence of structural units characteristic to Ag 2 O were not directly evidenced by FT-IR spectroscopy. The Raman analysis leads to similar conclusions as the FT-IR measurements.

STRUCTURAL STUDY OF Fe2O3–B2O3–CaO GLASSES BY IR SPECTROSCOPY

2002 ◽  
Vol 16 (21) ◽  
pp. 815-819
Author(s):  
I. ARDELEAN ◽  
P. PĂŞCUŢĂ
Keyword(s):  
Ir Spectroscopy ◽  
Structural Study ◽  
Gradual Increase ◽  
Glass Structure ◽  
Structural Units ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

lasses belonging to the x Fe 2 O 3·(100–x)[ 3B 2 O 3· CaO ] system (with 0 ≤ x ≤ 50 mol %) have been investigated by IR spectroscopy. The influence of the gradual increase of Fe 2 O 3 content on the glass structure is revealed. Using FT-IR spectroscopy, the local structural units in glasses studied were found to have been modified by the presence of and the dependence on the Fe 2 O 3 content.

Multiscale exploration of hydrocarbons adsorption and hopping through the ZSM-5 channels - from Monte Carlo modelling to experiment

2021 ◽  
Author(s):  
Maciej Strzempek ◽  
Karolina A. Tarach ◽  
Kinga Góra-Marek ◽  
Fernando Rey ◽  
Miguel Palomino ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ir Spectroscopy ◽  
Aliphatic Hydrocarbons ◽  
Adsorption Studies ◽  
Ft Ir ◽  
Gravimetric Adsorption ◽  
Hydrocarbons Adsorption ◽  
Ft Ir Spectroscopy

Abstract In this article the results of the statistical MC modelling corroborated by the FT-IR spectroscopy and gravimetric adsorption studies of the low aliphatic hydrocarbons in ZSM-5 (Si/Al =28 or...

scholarly journals Vibrational Spectroscopic Investigation of Blood Plasma and Serum by Drop Coating Deposition for Clinical Application

2021 ◽  
Vol 22 (4) ◽  
pp. 2191
Author(s):  
Jing Huang ◽  
Nairveen Ali ◽  
Elsie Quansah ◽  
Shuxia Guo ◽  
Michel Noutsias ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Outer Ring ◽  
Imaging Method ◽  
Fluorescence Lifetime Imaging ◽  
Drying Process ◽  
Vibrational Signal ◽  
Coating Deposition ◽  
Ft Ir ◽  
Sample Droplet ◽  
Ft Ir Spectroscopy

In recent decades, vibrational spectroscopic methods such as Raman and FT-IR spectroscopy are widely applied to investigate plasma and serum samples. These methods are combined with drop coating deposition techniques to pre-concentrate the biomolecules in the dried droplet to improve the detected vibrational signal. However, most often encountered challenge is the inhomogeneous redistribution of biomolecules due to the coffee-ring effect. In this study, the variation in biomolecule distribution within the dried-sample droplet has been investigated using Raman and FT-IR spectroscopy and fluorescence lifetime imaging method. The plasma-sample from healthy donors were investigated to show the spectral differences between the inner and outer-ring region of the dried-sample droplet. Further, the preferred location of deposition of the most abundant protein albumin in the blood during the drying process of the plasma has been illustrated by using deuterated albumin. Subsequently, two patients with different cardiac-related diseases were investigated exemplarily to illustrate the variation in the pattern of plasma and serum biomolecule distribution during the drying process and its impact on patient-stratification. The study shows that a uniform sampling position of the droplet, both at the inner and the outer ring, is necessary for thorough clinical characterization of the patient’s plasma and serum sample using vibrational spectroscopy.

FT-IR Spectroscopy As A Tool For The Study Of Metal Ions/D- Galactose Complexes

1989 ◽  
Author(s):  
Ning Xi ◽  
Shifu Weng ◽  
Jinguang Wu ◽  
Guangxian Xu
Keyword(s):  
Ir Spectroscopy ◽  
Metal Ions ◽  
Ft Ir ◽  
Ft Ir Spectroscopy
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