Raman spectroscopy provides insight into carbonate rock fabric based on calcite and dolomite crystal orientation

2021 ◽  
Author(s):  
Ashley E. Murphy ◽  
Ryan S. Jakubek ◽  
Andrew Steele ◽  
Marc D. Fries ◽  
Mihaela Glamoclija
Keyword(s):  
Raman Spectroscopy ◽  
Crystal Orientation ◽  
Carbonate Rock ◽  
Rock Fabric ◽  
Dolomite Crystal ◽  
Insight Into

In situ loading of well-dispersed silver nanoparticles on nanocrystalline magnesium oxide for real-time monitoring of catalytic reactions by surface enhanced Raman spectroscopy

Nanoscale ◽  
2015 ◽  
Vol 7 (40) ◽  
pp. 16952-16959 ◽  
Author(s):  
Kaige Zhang ◽  
Gongke Li ◽  
Yuling Hu
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Catalytic Reactions ◽  
Reaction Intermediates ◽  
Reaction Conditions ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanocrystalline Magnesium Oxide ◽  
Insight Into

The surface-enhanced Raman spectroscopy (SERS) technique is of great importance for insight into the transient reaction intermediates and mechanistic pathways involved in heterogeneously catalyzed chemical reactions under actual reaction conditions, especially in water.

Shining light on low-temperature methanol aqueous-phase reforming using homogeneous Ru-pincer complexes – operando Raman-GC studies

2017 ◽  
Vol 2 (3) ◽  
pp. 390-396 ◽  
Author(s):  
Vinzent Strobel ◽  
Julian Jonathan Schuster ◽  
Andreas Siegfried Braeuer ◽  
Lydia Katharina Vogt ◽  
Henrik Junge ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Aqueous Phase ◽  
Volume Flow ◽  
Pincer Complexes ◽  
Methanol Reforming ◽  
Aqueous Phase Reforming ◽  
Flow Monitoring ◽  
Insight Into

A combination of operando Raman spectroscopy with online GC and volume-flow monitoring allows rapid insight into low-temperature methanol reforming.

Optical Diagnostics of Microstructures Fabricated Using Quantum Well Intermixing

1999 ◽  
Vol 607 ◽  
Author(s):  
A. Saher Helmy ◽  
A.C. Bryce ◽  
C.N. Ironside ◽  
J.S. Aitchison ◽  
J.H. Marsh ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Quantum Well ◽  
Spatial Resolution ◽  
Optical Diagnostics ◽  
Complete Suppression ◽  
Quantum Well Intermixing ◽  
Spatially Resolved ◽  
Non Destructive ◽  
Insight Into ◽  
Free Vacancy

AbstractIn this paper we shall discuss techniques for accurate, non-destructive, optical characterisation of structures fabricated using quantum well intermixing (QWI). Spatially resolved photoluminescence and Raman spectroscopy were used to characterise the lateral bandgap profiles produced by impurity free vacancy disordering (IFVD) technology. Different features were used to examine the spatial resolution of the intermixing process. Features include 1:1 gratings as well as isolated stripes. From the measurements, the spatial selectivity of IFVD could be identified, and was found to be ∼4.5 μm, in contrast with the spatial resolution of the process of sputtering induced intermixing, which was found to be ∼2.5 μm. In addition, PL measurements on 1:1 gratings fabricated using IFVD show almost complete suppression of intermixing dielectric cap gratings with periods less than 10 microns. Finally, some insight into the limitations and merits of PL and Raman for the precision characterisation of QWI will be presented.

scholarly journals Effect of Ionic Liquids on the Physical Properties of the Newly Synthesized Conducting Polymer

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Dong Uk Lee ◽  
Jin Yeong Jeong ◽  
Ji Woong Han ◽  
Gi-Chung Kwon ◽  
Pankaj Attri ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ionic Liquids ◽  
Conducting Polymer ◽  
Optical Devices ◽  
Polymer Mixtures ◽  
Confocal Raman Spectroscopy ◽  
Vis Spectroscopy ◽  
Film Roughness ◽  
Confocal Raman ◽  
Insight Into

Conducting polymer has many applications in electronics, optical devices, sensors, and so on; however, there is still a massive scope of improvement in this area. Therefore, towards this aim, in this study, we synthesized a new thiophene-based conducting polymer, 2-heptadecyl-5-hexyl-6-(5-methylthiophen-2-yl)-4-(5-((E)-prop-1-enyl)thiophen-2-yl)-5H-pyrrolo[3,4-d]thiazole (HHMPT). Further, to increase its application, the interactions between the conducting polymer (HHMPT) and ionic liquids (ILs) were investigated by UV-Vis spectroscopy, FTIR spectroscopy, and confocal Raman spectroscopy techniques. Moreover, film roughness and conductivity of the polymer film with or without ILs were also studied. The imidazolium- and ammonium family ILs with the potential to interact with the newly synthesized conducting polymer were used. The results of the interaction studies revealed that the imidazolium family IL-polymer mixtures and ammonium family IL-polymer mixtures have almost similar conductivity at low concentration of ILs. This study provides an insight into the combined effect of a polymer and ILs and may generate many theoretical and experimental opportunities.

Combined synchrotron x-ray diffraction and micro-Raman for following in situ the growth of solution-deposited YBa2Cu3O7 thin films

2005 ◽  
Vol 20 (12) ◽  
pp. 3270-3273 ◽  
Author(s):  
F. Berberich ◽  
H. Graafsma ◽  
B. Rousseau ◽  
A. Canizares ◽  
R. Ramy Ratiarison ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Additional Information ◽  
Micro Raman Spectroscopy ◽  
High Temperature Process ◽  
Structural Growth ◽  
Metal Organic ◽  
Insight Into

A unique combination of in situ synchrotron x-ray diffraction and in situ micro-Raman spectroscopy was used to study the growth process of YBa2Cu3O6+x films obtained by metal organic decomposition using trifluoroacetate precursor on LaAlO3 substrates. The techniques give complementary information: x-ray diffraction gives insight into the structural growth, whereas micro-Raman spectroscopy gives information of the chemical composition with additional information on the texture. To perform both experiments in situ, a special high-temperature process chamber was designed.

scholarly journals Electrochemistry and surface-enhanced Raman spectroscopy of CTAB modulated interactions of magnetic nanoparticles with biomolecules

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 3628-3634 ◽  
Author(s):  
Delina Joseph ◽  
Raul D. Rodriguez ◽  
Akash Verma ◽  
Elaheh Pousaneh ◽  
Dietrich R. T. Zahn ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cyclic Voltammetry ◽  
Magnetic Nanoparticles ◽  
Electrochemical Behavior ◽  
Surface Enhanced Raman Spectroscopy ◽  
Molecular Associations ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Insight Into

In this study, cyclic voltammetry was used to unearth the electrochemical behavior of MNPs/CTAB and their interaction with biomolecules whereas SERS provided an insight into the mode of interaction in these molecular associations.

scholarly journals Ancient origins and multiple appearances of carotenoid-pigmented feathers in birds

2014 ◽  
Vol 281 (1788) ◽  
pp. 20140806 ◽  
Author(s):  
Daniel B. Thomas ◽  
Kevin J. McGraw ◽  
Michael W. Butler ◽  
Matthew T. Carrano ◽  
Odile Madden ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Performance ◽  
Evolutionary History ◽  
Carotenoid Pigments ◽  
Biological Functions ◽  
The Family ◽  
Family Level ◽  
History Of ◽  
Living Species ◽  
Insight Into

The broad palette of feather colours displayed by birds serves diverse biological functions, including communication and camouflage. Fossil feathers provide evidence that some avian colours, like black and brown melanins, have existed for at least 160 million years (Myr), but no traces of bright carotenoid pigments in ancient feathers have been reported. Insight into the evolutionary history of plumage carotenoids may instead be gained from living species. We visually surveyed modern birds for carotenoid-consistent plumage colours (present in 2956 of 9993 species). We then used high-performance liquid chromatography and Raman spectroscopy to chemically assess the family-level distribution of plumage carotenoids, confirming their presence in 95 of 236 extant bird families (only 36 family-level occurrences had been confirmed previously). Using our data for all modern birds, we modelled the evolutionary history of carotenoid-consistent plumage colours on recent supertrees. Results support multiple independent origins of carotenoid plumage pigmentation in 13 orders, including six orders without previous reports of plumage carotenoids. Based on time calibrations from the supertree, the number of avian families displaying plumage carotenoids increased throughout the Cenozoic, and most plumage carotenoid originations occurred after the Miocene Epoch (23 Myr). The earliest origination of plumage carotenoids was reconstructed within Passeriformes, during the Palaeocene Epoch (66–56 Myr), and not at the base of crown-lineage birds.

scholarly journals Observing the emergence of phase biaxiality in a polar smectic A system via polarised Raman spectroscopy

2017 ◽  
Vol 5 (5) ◽  
pp. 1195-1205 ◽  
Author(s):  
Z. Zhang ◽  
S. Kaur ◽  
B. Kundu ◽  
B. K. Sadashiva ◽  
H. F. Gleeson
Keyword(s):  
Raman Spectroscopy ◽  
Dielectric Properties ◽  
Smectic A ◽  
Smectic Phases ◽  
Insight Into

We report polarised Raman spectroscopy, and optical and dielectric properties of an asymmetric bent-core compound offering a new insight into the emergence of phase biaxiality in polar smectic phases.

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