scholarly journals Molecular Microspectroscopy: Where are we and where are we going

1996 ◽  
Vol 4 (10) ◽  
pp. 12-13
Author(s):  
John A. Reffner
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Analysis ◽  
Light Microscopy ◽  
Molecular Orientation ◽  
Crystalline State ◽  
Microscopic Scale ◽  
Commercial Success ◽  
Infrared Microspectroscopy ◽  
Micro Raman Spectroscopy ◽  
History Of

Molecular microspectroscopy is the application of infrared or Raman spectrascopy, combined with light microscopy, for chemical analysis on the microscopic scale. For over a decade infrared microspectroscopy (ISM) has been an expanding technology both scientifically and commercially. Micro- Raman spectroscopy has a long history of scientific accomplishments with limited commercial success. Both of these techniques give spectral data that can be related to the bonding, crystalline state, isotopic content and molecular orientation of a material, but not its elemental composition.

scholarly journals Orientation Mapping of Extruded Polymeric Composites by Polarized Micro-Raman Spectroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoyun Chen ◽  
M. Anne Leugers ◽  
Tim Kirch ◽  
Jamie Stanley
Keyword(s):  
Raman Spectroscopy ◽  
Molecular Orientation ◽  
Polymeric Composite ◽  
Surface Region ◽  
Process Conditions ◽  
Entire Cross Section ◽  
Micro Raman Spectroscopy ◽  
Orientation Mapping ◽  
Degree Of Orientation ◽  
High Degree

Molecular orientation has a strong influence on polymeric composite materials’ mechanical properties. In this paper we describe the use of polarized micro-Raman spectroscopy as a powerful tool to map out the molecular orientation of a uniaxially oriented polypropylene- (PP-) based composite material. Initial samples exhibited a high degree of surface fibrillation upon cutting. Raman spectroscopy was used to characterize the degree of orientation in the skin and guide the development of the posttreatment process to optimize the skin relaxation while maintaining the high degree of orientation in the rest of the board. The PP oriented polymer composite (OPC) was oriented through an extrusion process and its surface was then treated to achieve relaxation. Micro-Raman analysis at the surface region demonstrated the surface orientation relaxation, and the results provide an effective way to correlate the extent of relaxation and process conditions. Larger scale orientation mapping was also carried out over the entire cross-section (12.7 cm × 2.54 cm). The results agree well with prior expectation of the molecular orientation based on the extrusion and subsequent quenching process. The methodologies described here can be readily applied to other polymeric systems.

scholarly journals Meridianiite detected in ice

2009 ◽  
Vol 55 (189) ◽  
pp. 117-122 ◽  
Author(s):  
F. Elif Genceli ◽  
Shinichirou Horikawa ◽  
Yoshinori Iizuka ◽  
Toshimitsu Sakurai ◽  
Takeo Hondoh ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Sea Ice ◽  
Magnesium Sulfate ◽  
Raman Spectra ◽  
Sulfate Salt ◽  
Micro Raman Spectroscopy ◽  
Naturally Occurring ◽  
Formation History ◽  
History Of

AbstractInclusions affect the behavior of ice, and their characteristics help us understand the formation history of the ice. Recently, a low-temperature magnesium sulfate salt was discovered. This paper describes this naturally occurring MgSO4·11H2O mineral, meridianiite, derived from salt inclusions in sea ice of Lake Saroma, Japan and in Antarctic continental core ice. Its occurrence is confirmed by using micro-Raman spectroscopy to compare Raman spectra of synthetic MgSO4·11H2O with those of the inclusions.

Chemical analysis of graphene oxide films after heat and chemical treatments by X-ray photoelectron and Micro-Raman spectroscopy

Carbon ◽  
2009 ◽  
Vol 47 (1) ◽  
pp. 145-152 ◽  
Author(s):  
Dongxing Yang ◽  
Aruna Velamakanni ◽  
Gülay Bozoklu ◽  
Sungjin Park ◽  
Meryl Stoller ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Chemical Analysis ◽  
Oxide Films ◽  
X Ray ◽  
Chemical Treatments ◽  
Micro Raman Spectroscopy

Molecular and Lamellar Orientation of α- and β-Transcrystalline Layers in Polypropylene Composites by Polarized Confocal Micro-Raman Spectroscopy: Raman Imaging by Static Point Illumination

2000 ◽  
Vol 54 (8) ◽  
pp. 1105-1113 ◽  
Author(s):  
M. R. Fernández ◽  
J. C. Merino ◽  
M. I. Gobernado-Mitre ◽  
J. M. Pastor
Keyword(s):  
Raman Spectroscopy ◽  
Molecular Orientation ◽  
Nucleating Agent ◽  
Polypropylene Composites ◽  
Micro Raman Spectroscopy ◽  
Beta Form ◽  
Lamellar Orientation ◽  
Pet Fibers ◽  
Preferential Nucleation ◽  
Static Point

Crystallization of isotactic polypropylene (iPP) from the melt in the presence of poly(ethyleneterephthalate) (PET) fibers has been shown to produce preferential nucleation at the fiber surfaces leading to formation of columnar or transcrystalline growth. The crystalline development of PP has been examined by using optical microscopy. Polarized confocal micro-Raman spectroscopy was carried out to investigate the qualitative molecular orientation of alpha and beta transcrystalline regions around PET fibers embedded in a PP matrix. Uncoated PET fibers generate alpha transcrystallinity (α-TC) due to its strong α-nucleation ability. By coating the reinforcing PET fibers with the appropriate nucleating agent, one induces beta transcrystallinity (β-TC) in the PET fiber-reinforced iPP composites. α-TC layers have been also observed with the use of PET sheets as nucleating substrates. The spectroscopic results reveal that lamellar orientation in alpha transcrystalline structures differs significantly from the beta form. Furthermore, two different molecular orientations in the α-TC have been detected.

Molecular Microspectroscopy: Where are we and where are we going ?

1996 ◽  
Vol 54 ◽  
pp. 250-251
Author(s):  
John A. Reffner
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Optical Design ◽  
Molecular Chemistry ◽  
X Ray ◽  
Infrared Microspectroscopy ◽  
Elemental Analyses ◽  
History Of ◽  
Electron Microscopes ◽  
High Rejection

Molecular microspectroscopy is the application of infrared or Raman spectroscopy, combined with light microscopy, for chemical analysis on the microscopic scale. For over a decade infrared microspectroscopy (IMS) has been an expanding technology both scientifically and commercially. Micro-Raman spectroscopy has a long history of scientific accomplishments with limited commercial success. Both of these techniques give spectral data that can be related to the bonding, crystalline state, isotopic content and molecular orientation of a material, but not its elemental composition. In this regards, molecular microspectroscopy compliments the elemental analyses performed with electron microscopes using x-ray emission spectroscopy. Resolving molecular chemistry of microscopic domains is the essence of molecular microspectroscopy.Raman spectroscopy is experiencing renewed interest because of several advances in optics and photonics. Near-infrared lasers combined with Fourier transform spectrometers greatly reduced fluorescence interference, making Raman spectroscopy practical for many samples. The development of filters with high rejection of the Rayleigh scattered radiation simplifies the optical design of Raman systems. These filters are playing an important role in micro-Raman. CCD and CID detector technology, lasers, acusto-optical tuned filters (AOTF), liquid-crystal tuned filters (LCTF) and imaging spectrometers are contributing to a proliferation of new micro-Raman systems.

scholarly journals Graphite-Based Geothermometry on Almahata Sitta Ureilitic Meteorites

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1005
Author(s):  
Anna Barbaro ◽  
M. Domeneghetti ◽  
Cyrena Goodrich ◽  
Moreno Meneghetti ◽  
Lucio Litti ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Grain Size ◽  
Domain Size ◽  
Parent Body ◽  
Impact Event ◽  
Full Width ◽  
Half Maximum ◽  
Micro Raman Spectroscopy ◽  
History Of ◽  
The University

The thermal history of carbon phases, including graphite and diamond, in the ureilite meteorites has implications for the formation, igneous evolution, and impact disruption of their parent body early in the history of the Solar System. Geothermometry data were obtained by micro-Raman spectroscopy on graphite in Almahata Sitta (AhS) ureilites AhS 72, AhS 209b and AhS A135A from the University of Khartoum collection. In these samples, graphite shows G-band peak centers between 1578 and 1585 cm−1 and the full width at half maximum values correspond to a crystallization temperature of 1266 °C for graphite for AhS 209b, 1242 °C for AhS 72, and 1332 °C for AhS A135A. Recent work on AhS 72 and AhS 209b has shown graphite associated with nanodiamonds and argued that this assemblage formed due to an impact-event. Our samples show disordered graphite with a crystalline domain size ranging between about 70 and 140 nm. The nanometric grain-size of the recrystallized graphite indicates that it records a shock event and thus argues that the temperatures we obtained are related to such an event, rather than the primary igneous processing of the ureilite parent body.

Micro-Raman Spectroscopy Evaluation of the Local Mechanical Stress in Shallow Trench Isolation CMOS Structures: Correlation with Defect Generation and Diode Leakage

1998 ◽  
Author(s):  
I. De Wolf ◽  
G. Groeseneken ◽  
H.E. Maes ◽  
M. Bolt ◽  
K. Barla ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Mechanical Stress ◽  
Defect Formation ◽  
Active Area ◽  
Wet Oxidation ◽  
Leakage Currents ◽  
Shallow Trench Isolation ◽  
Micro Raman Spectroscopy ◽  
Silicon Devices ◽  
Trench Isolation

Abstract It is shown, using micro-Raman spectroscopy, that Shallow Trench Isolation introduces high stresses in the active area of silicon devices when wet oxidation steps are used. These stresses result in defect formation in the active area, leading to high diode leakage currents. The stress levels are highest near the outer edges of line structures and at square structures. They also increase with decreasing active area dimensions.

Submicron Simultaneous IR and Raman Spectroscopy (IR+Raman): Breakthrough Developments in Optical Photothermal IR (O-PTIR) Combined for Enhanced Failure Analysis

2019 ◽  
Author(s):  
Jay Anderson ◽  
Mustafa Kansiz ◽  
Michael Lo ◽  
Curtis Marcott
Keyword(s):  
Raman Spectroscopy ◽  
Failure Analysis ◽  
Data Quality ◽  
Raman Spectra ◽  
Spatial Resolution ◽  
Far Field ◽  
Field Mode ◽  
Microscopic Scale ◽  
Analytical Tools ◽  
Ir And Raman

Abstract Failure analysis of organics at the microscopic scale is an increasingly important requirement, with traditional analytical tools such as FTIR and Raman microscopy, having significant limitations in either spatial resolution or data quality. We introduce here a new method of obtaining Infrared microspectroscopic information, at the submicron level in reflection (far-field) mode, called Optical-Photothermal Infrared (O-PTIR) spectroscopy, that can also generate simultaneous Raman spectra, from the same spot, at the same time and with the same spatial resolution. This novel combination of these two correlative techniques can be considered to be complimentary and confirmatory, in which the IR confirms the Raman result and vice-versa, to yield more accurate and therefore more confident organic unknowns analysis.

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