Photoacoustic spectroscopy: A promising technique to investigate magnetic fluids

2003 ◽  
Vol 39 (5) ◽  
pp. 2654-2656 ◽  
Author(s):  
P.C. Morais ◽  
A.C. Oliveira ◽  
A.L. Tronconi ◽  
T. Goetze ◽  
N. Buske
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Magnetic Fluids ◽  
Promising Technique

Use of the photoacoustic spectroscopy in the investigation of biocompatible magnetic fluids

2005 ◽  
Vol 125 ◽  
pp. 27-30 ◽  
Author(s):  
J. G. Santos ◽  
L. B. Silveira ◽  
A. C. Oliveira ◽  
P. C. Morais
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Magnetic Fluids

Photoacoustic spectroscopy of cobalt ferrite-based magnetic fluids

2004 ◽  
Vol 272-276 ◽  
pp. 2335-2336 ◽  
Author(s):  
A.L. Tronconi ◽  
A.C. Oliveira ◽  
E.C.D. Lima ◽  
P.C. Morais
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Cobalt Ferrite ◽  
Magnetic Fluids

Photoacoustic spectroscopy of magnetic fluids

2002 ◽  
Vol 252 ◽  
pp. 56-58 ◽  
Author(s):  
A.C Oliveira ◽  
A.L Tronconi ◽  
N Buske ◽  
P.C Morais
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Magnetic Fluids

EXELFS Studies of Carbon Fibers

1990 ◽  
Vol 48 (2) ◽  
pp. 72-73
Author(s):  
V. Serin ◽  
K. Hssein ◽  
G. Zanchi ◽  
J. Sévely
Keyword(s):  
Carbon Fibers ◽  
Energy Analysis ◽  
Electron Excitation ◽  
Complex Structures ◽  
High Modulus ◽  
Promising Technique ◽  
X Ray ◽  
Fine Structures ◽  
X Ray Absorption

The present developments of electron energy analysis in the microscopes by E.E.L.S. allow an accurate recording of the spectra and of their different complex structures associated with the inner shell electron excitation by the incident electrons (1). Among these structures, the Extended Energy Loss Fine Structures (EXELFS) are of particular interest. They are equivalent to the well known EXAFS oscillations in X-ray absorption spectroscopy. Due to the EELS characteristic, the Fourier analysis of EXELFS oscillations appears as a promising technique for the characterization of composite materials, the major constituents of which are low Z elements. Using EXELFS, we have developed a microstructural study of carbon fibers. This analysis concerns the carbon K edge, which appears in the spectra at 285 eV. The purpose of the paper is to compare the local short range order, determined by this way in the case of Courtauld HTS and P100 ex-polyacrylonitrile carbon fibers, which are high tensile strength (HTS) and high modulus (HM) fibers respectively.

CBED analysis of impurity distributions in AlN

1990 ◽  
Vol 48 (4) ◽  
pp. 214-215
Author(s):  
Daniel Callahan ◽  
G. Thomas
Keyword(s):  
Aluminum Nitride ◽  
Bulk Material ◽  
Strong Dependence ◽  
Lattice Parameter ◽  
Promising Technique ◽  
Nitride Ceramics ◽  
Surface Phases ◽  
Convergent Beam ◽  
Oxygen Impurities

Oxygen impurities may significantly influence the properties of nitride ceramics with a strong dependence on the microstructural distribution of the impurity. For example, amorphous oxygen-rich grain boundary phases are well-known to cause high-temperature mechanical strength degradation in silicon nitride whereas solutionized oxygen is known to decrease the thermal conductivity of aluminum nitride. Microanalytical characterization of these impurities by spectral methods in the AEM is complicated by reactions which form oxygen-rich surface phases not representative of the bulk material. Furthermore, the impurity concentrations found in higher quality ceramics may be too low to measure by EDS or PEELS. Consequently an alternate method for the characterization of impurities in these ceramics has been investigated.Convergent beam electron diffraction (CBED) is a promising technique for the study of impurity distributions in aluminum nitride ceramics. Oxygen is known to enter into stoichiometric solutions with AIN with a consequent decrease in lattice parameter.

IN VIVO PHOTOACOUSTIC SPECTROSCOPY OF THE SKIN

1983 ◽  
Vol 44 (C6) ◽  
pp. C6-413-C6-418 ◽  
Author(s):  
P. Poulet ◽  
J. Chambron
Keyword(s):  
Photoacoustic Spectroscopy
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