scholarly journals Raman Spectroscopy of Isotactic Polypropylene-Halloysite Nanocomposites

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Elamin E. Ibrahim ◽  
Dorina Magdalena Chipara ◽  
Ram Thapa ◽  
Karen Lozano ◽  
Mircea Chipara
Keyword(s):  
Raman Spectroscopy ◽  
Detailed Analysis ◽  
Isotactic Polypropylene ◽  
Thermal Processing ◽  
Polymeric Matrix

Raman spectroscopy investigations on nanocomposites obtained by dispersing halloysite within isotactic polypropylene are reported. A detailed analysis of the modifications of the regularity band associated to the polymeric matrix is presented. The Raman lines assigned to the polymeric matrix are broadened and weakened as the loading with halloysite is increased. The analysis of Raman lines indicates that the polymeric matrix becomes less crystalline upon the loading with halloysite and that the nanofiller is experiencing a weak dehydration upon dispersion within the polymeric matrix, probably due to the related thermal processing used to achieve the dispersion of halloysite.

Applications in: Environmental Analytics (fine particles)

2019 ◽  
Vol 4 (6) ◽  
Author(s):  
Markus Lankers
Keyword(s):  
Raman Spectroscopy ◽  
Detailed Analysis ◽  
Fine Particles ◽  
Raman Microscopy ◽  
New Developments ◽  
Micro Raman Spectroscopy ◽  
Environmental Analytics

Abstract Micro Raman spectroscopy has been applied very early in environmental analytics. However, until now the field of application is quite limited. The main reasons for the low acceptance are high cost of the method and the low throughput. New developments in technology lead to cheaper instrumentation. Automation of Raman microscopy of particles might be a solution for a higher throughput and a broader application in environmental analytics. A more detailed analysis of aerosols and microplastic is good examples that could benefit from this development.

Factors affecting Ge nanocrystal size in co-sputtered Ge+SiO2films

2000 ◽  
Vol 638 ◽  
Author(s):  
WK Choi ◽  
V Ng ◽  
YW Ho ◽  
TB Chen ◽  
V Ho
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Thermal Processing ◽  
Rapid Thermal Processing ◽  
Annealing Duration ◽  
Factors Affecting ◽  
Transmission Electron ◽  
Germanium Nanocrystals ◽  
Ge Nanocrystals

AbstractThe high resolution transmission electron microscopy and Raman spectroscopy results of germanium nanocrystals embedded in SiO2 synthesized by rapid thermal processing (RTA) have been presented. From the results of samples with different Ge concentrations, it was concluded that there is a narrow window in the Ge concentration that can produce nanocrystals. We also showed that it is possible to vary RTA duration or temperature to produce Ge nanocrystals with varying sizes. Our results therefore suggest that it is possible to utilize (i) annealing duration and; (ii) temperature to tune crystal sizes for optoelectronic applications.

PRELIMINARY INVESTIGATION BY RAMAN SPECTROSCOPY OF SOME POLYMERIC MATRIX WITH PHARMACEUTICAL APPLICATIONS

2007 ◽  
Vol 21 (16) ◽  
pp. 987-995 ◽  
Author(s):  
M. TODICA ◽  
C. V. POP ◽  
E. DINTE ◽  
C. FARCAU ◽  
S. ASTILEAN
Keyword(s):  
Raman Spectroscopy ◽  
Ethylene Oxide ◽  
Preliminary Investigation ◽  
Pharmaceutical Products ◽  
Pharmaceutical Product ◽  
Polymeric Matrix ◽  
Reversible Process ◽  
Pharmaceutical Applications ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The possibility to use poly(ethylene oxide) as a polymeric matrix for some pharmaceutical products was analyzed. The behavior of the polymer in the aqueous solutions and the possible interactions between the polymer and the clotrimazole were investigated by Raman spectroscopy. Repeated action of the water on the polymeric conformation is a reversible process and the introduction of the clotrimazole in the polymeric gel do not modify the properties of the active substance of the pharmaceutical product.

The β-Spherulite Morphology of Isotactic Polypropylene Investigated by Raman Spectroscopy

2009 ◽  
Vol 63 (12) ◽  
pp. 1377-1381 ◽  
Author(s):  
J. Martin ◽  
P. Bourson ◽  
A. Dahoun ◽  
J. M. Hiver
Keyword(s):  
Raman Spectroscopy ◽  
Isotactic Polypropylene ◽  
Spherulite Morphology

Effect of thermal processing on strain relaxation and interdiffusion in Si/SiGe heterostructures studied using Raman spectroscopy

2001 ◽  
Vol 79 (14) ◽  
pp. 2148-2150 ◽  
Author(s):  
S. J. Koester ◽  
K. Rim ◽  
J. O. Chu ◽  
P. M. Mooney ◽  
J. A. Ott ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Thermal Processing ◽  
Strain Relaxation

Stress distribution in polycrystalline silicon thin film solar cells on glass measured by micro-Raman spectroscopy

2007 ◽  
Vol 1024 ◽  
Author(s):  
George Sarau ◽  
Michael Becker ◽  
Andreas Berger ◽  
Jens Schneider ◽  
Silke Christiansen
Keyword(s):  
Thin Film ◽  
Raman Spectroscopy ◽  
Solar Cells ◽  
Thermal Processing ◽  
Glass Substrate ◽  
Polycrystalline Silicon ◽  
Thin Film Solar Cells ◽  
Internal Stresses ◽  
Silicon Thin Film ◽  
Micro Raman Spectroscopy

AbstractMicro-Raman spectroscopy is used to measure stress distributions in 1.5 µm thick polycrystalline silicon thin film solar cells on glass. These measurements are combined with transmission electron microscopy and atomic force microscopy to assign the measured local stresses to the sample's microstructure. Expansion and contraction of the silicon lattice in the layer and the borosilicate glass substrate during the thermal processing of the solar cell as well as quartz beads of µm size that reside on the glass substrate for light-trapping purposes induce internal stresses that locally vary with structural features. While the thermal processing induces an average tensile stress in the silicon layer originating from the thermal mismatch between glass and silicon, the latter results in lateral stress gradients up to 208 ± 12 MPa in the mapped area.

Sign in / Sign up

Export Citation Format

Share Document