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Borate Phosphor
Published in S. K. Omanwar, R. P. Sonekar, N. S. Bajaj, Borate Phosphors, 2022
Raman spectroscopy is an analytical technique, in which scattered light is used to measure the vibrational energy modes of a sample. This phenomenon was first observed by K. S. Krishnan in 1928. After that, Indian scientist C. V. Raman worked with K. S. Krishnan [121]. Raman spectroscopy provides chemical and structural information of material, in addition to the identification of substances through their characteristic Raman ‘fingerprint’ [122].
The Emerging Role of Exosome Nanoparticles in Regenerative Medicine
Published in Harishkumar Madhyastha, Durgesh Nandini Chauhan, Nanopharmaceuticals in Regenerative Medicine, 2022
Zahra Sadat Hashemi, Mahlegha Ghavami, Saeed Khalili, Seyed Morteza Naghib
Raman spectroscopy is a spectroscopy light scattering technique and identifies the vibrational states of sample particles. The laser light interacts with particles and results in a shift in the energy of the laser photons. Finally, it gives molecular fingerprints and bond structures of the sample. According to this approach, the chemical composition of EV will be achieved (for example human urinary exosomes were reported (Tatischeff et al. 2012)).
Real-time Analysis for Pollution Prevention
Published in Aidé Sáenz-Galindo, Adali Oliva Castañeda-Facio, Raúl Rodríguez-Herrera, Green Chemistry and Applications, 2020
Maria Isabel Martinez Espinoza
Raman Spectroscopy. Raman spectroscopy is a rapid, non-destructive, noninvasive method which does not require sample preparation and measurements can be done in aqueous environments and provides a molecular footprint of each sample. This technique is used as a technique of analysis applied inside and outside the laboratories, and is considered an analytical research tool very efficient in the analysis of different samples of different natures such as liquids, cells, materials, pharmaceuticals and bioprocesses. Current pharmaceutical applications include identifying polymorphs, monitoring real-time processes, detection of counterfeit and adulterated pharmaceutical products (Davis et al., 2007).
A double perovskite BiLaCoMnO6: synthesis, microstructural, dielectric and optical properties
Published in Phase Transitions, 2023
S. K. Parida, Tanushree Satapathy, S. Mishra, R. N. P. Choudhary
Raman spectroscopy is a very important tool; where the scattered light is used to measure the vibrational energy modes of the material under study. It gives detailed information on molecular composition and structure. Figure 3 shows the Raman spectrum of the BiLaCoMnO6 ceramic. In this present study, the active Raman modes are observed at 201, 263, 382, 498, 636, 746, 850, and 946 cm−1 respectively. The assignment of the strongest Raman peak in the double perovskite is observed at 636 cm−1 corresponding to Ag while the peak at 498 cm−1 corresponds to T2g Raman active mode [35]. The strongest peak at 636 cm−1 is the frequency range of anti-stretching and bending vibrations of (Mn/Co) octahedra and also Raman active in #P4bm structure [36–38]. Again, the presence of weak Raman lines corresponding to modes at respective frequency bands supports the monoclinic crystal symmetry (#C/2c). Therefore, the presence of all Raman line corresponding to modes confirms the presence of all atomic vibration of constituent elements and support the tetragonal crystal symmetry in the prepared stable double perovskite.
Nickel oxide nanoparticles: biosynthesized, characterization and photocatalytic application in degradation of methylene blue dye
Published in Inorganic and Nano-Metal Chemistry, 2022
Abdolhossein Miri, Fatemah Mahabbati, Ahmad Najafidoust, Mohammad Javad Miri, Mina Sarani
Raman spectroscopy is a molecular spectroscopy technique that is based on the interaction between light and matter. In this method, each material contains its own peak that is called the fingerprint of that certain material. In regards to the excited states of pure NiO, Raman scattering has exhibited one phonon (TO and LO) and two phonons (2TO, TO + LO and 2LO), as well as one, two, and four excited states of magnon (Figure 6). The Raman spectra of single-crystal NiO has displayed several bands above the point of 400 cm−1. It should be noted that the origin of first four bands was the vibrational origin including TO and LO modes of one-phonon (1 P) (within the range of 561 cm−1), 2TO modes of two-phonon (2 P) (in range of 710 cm−1), and TO + LO (855 cm−1) and 2LO (1009 cm−1) modes. Meanwhile, the last strong band observed at 1392 cm−1 has been apparently caused by two-magnon (2 M) scattering. This mode can be clearly perceived at room temperature due to the available high Nile temperatures. However, the 1 P band has been more evident owing to the defect or surface effect of powders, while the three bands of 2 P had appeared to be more extended and the 855 cm−1 band has virtually disappeared.[61] According to the peak location comparison between bulk nickel oxide and NiO NPs, the occurrence of a reduction in the size of nanoparticles can affect their magnetic behaviors and alter their peak location.
Review of Candidate Techniques for Material Accountancy Measurements in Electrochemical Separations Facilities
Published in Nuclear Technology, 2020
Jamie B. Coble, Steven E. Skutnik, S. Nathan Gilliam, Michael P. Cooper
Raman spectroscopy uses light of various wavelengths (including UV, infrared, and visible) to project a laser onto a substance and then measure the energy shift of the scattered light.85 Raman spectroscopy is similar to UV-Vis and Near-IR in that the measurement involves a comparison of before and after incidence, although energy shifts are measured instead of intensity. The energy shift results from vibrational shifts from the molecules of the material. Each element will give a different corresponding shift and thus leads to elemental identification over the lanthanide and actinide groups. Thus, it is also similar to LIBS except Raman spectroscopy uses a low-energy pulse where LIBS requires a high enough energy to exceed the ablation threshold. Therefore, it is possible to use a single instrument setup to combine Raman and LIBS if a short time delay is between the successive pulses.92 Raman spectroscopy is of particular interest within the salt of the electrorefiner, which holds multiple elements, to account for its complex composition. One advantage Raman spectroscopy has over UV-Vis and Near-IR is its ability to measure from a stand-off distance; that is, direct contact is not necessary. A result of this is the uncertainty is often much higher, typically 10% to 15% (Ref. 84).