https://www.omicsonline.org/open-access/stimulated-brillouin-scattering-in-highpower-photonic-crystal-fiber-lasers-in-different-pump-schemes-2469-410X-1000170-96476.html

T, Ravindra Reddy; Kasahara, Shoji; Endo, Tamio; S, Lakshmi Reddy

doi:10.4172/2469-410x.1000171

Cited by 23 publications

(7 citation statements)

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“…However, two pecks appearing at 3383 and 3320 cm -1 in the PtoB spectrum can be assigned to the N-H stretching vibration, which then disappeared in the PtoNB spectrum due to formation of CH=N group. The low frequency region, on the other hand, shows some bands which are characteristic for the prepared composites such as the sharp band appears at 1004 cm -1 which is the characteristic band of silicate layer of montmorillonite mineral representing the triplet degenerate stretching (in-plane) vibration (v3) of Si-O bond [14], while 792 cm -1 band corresponds to v1 mode of vibration which indicates a partial removal of the degeneracy [15]. However, the band at 905 cm -1 is assigned to hydroxyl deformation mode of Al-Al-OH or Al-OH-Al.…”

Section: Resultsmentioning

confidence: 99%

Untitled

2022

J. Med. Chem. Sci.

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4-methylaniline and its Schiff base derivative were intercalated into the Bentonite clay interlayers in a solid state reaction followed by a condensation reaction to produce two organo-clay composites. X-ray diffraction was used to identify the changes in basal spacing of montmorillonite layers which exhibited noticeable alteration before and after the formation of the composites. FT-IR spectra, on the other hand, were utilized for identifying the structural compositions of the prepared materials as well as the formation of the intercalated Schiff base derivative. The surface morphology of the composites was examined by Scanning Electron Microscopy SEM and Atomic Force Microscope AFM, which reflected some differences in the surface of prepared composites as the particle size decreased with the Schiff base formation.

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Section: Resultsmentioning

confidence: 99%

Untitled

2022

J. Med. Chem. Sci.

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“…The broad composite bands at 1634, 1633 and 1632 cm −1 are attributed to -OH bending. For all samples, the bands from 1634 to 1632 cm −1 are related to the asymmetric OH bending of water and is a structural part of the mineral [44]. The bands around 1638 cm −1 correspond to the deformation vibrations of water in the bentonite structure [47].…”

Section: Mineralogical Effects Of Calcinationsmentioning

confidence: 94%

“…The bands around 1638 cm −1 correspond to the deformation vibrations of water in the bentonite structure [47]. The absorption bands at 1032-1010 cm −1 are a characteristic for montmorillonite and are assigned to the vibration of Si-O stretching [44]. The FTIR spectra of the unheated CaB 1 , CaB 2 and CaB 3 revealed that bands at 1005-1010 cm −1 correspond to montmorillonite mineral.…”

Section: Mineralogical Effects Of Calcinationsmentioning

confidence: 97%

“…FTIR spectra of the unheated samples show vibrations in the region between 3623 cm −1 and 1632 cm −1 due to the vibrations of OH groups. All Cabentonite samples show absorption bands at 3623 cm −1 and 3620 cm −1 which are assigned to OH stretching of structural hydroxyl groups and water present in the composition [41][42][43][44]. The bands at 3620-3628 cm −1 are typical and characteristic vibrations for smectites [45] with high amount of Al in the octahedra [46].…”

Section: Mineralogical Effects Of Calcinationsmentioning

confidence: 99%

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Effects of short-term high-temperature calcinations on the physico-chemical and mineralogical properties of Ca-bentonites from Ünye (Ordu, NE Turkey)

Ataytür

Küçükuysal

Güngör³

et al. 2021

J Therm Anal Calorim

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Three Ca-bentonite samples from Ünye (NE Turkey) were calcined up to 1000 °C with 200 °C increments at 25 min. The physico-chemical and mineralogical effects of high-temperature loadings were evaluated by X-ray diffraction (XRD), Fouriertransform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) and loss on ignition (LOI) analysis. The results of the experiments show that the dehydration up to 400 °C does not alter the properties of Ca-bentonites significantly; however, the endothermic reactions due to dehydroxylation between 400 and 800 °C cause the deformation in the Ca-smectite crystal structure revealed by the collapse of the basal reflection from 1.4 to 1.0 nm and the gradual disappearance of OH stretching of structural hydroxyl groups and decrease in specific surface area and the closure of micropores. By calcination at 1000 °C, the specific surface area reaches the minima of 1.33-2.05 m 2 g −1 for all the samples, and the structure of Ca-smectite is almost completely decomposed for CaB 2 and CaB 3 , however, partially decomposed for CaB 1 due to incomplete dehydroxylation stage. The crystallinity of opal-CT intensifies, and the formation of amorphous silica phases is promoted for all samples at 1000 °C; however, the formation of mullite is enhanced only for CaB 2 and CaB 3. The sintering effect is revealed as much larger aggregates with more rounded morphologies. It is also determined that the calcination up to 1000 °C does not affect the mesoporous characteristics of Ca-bentonite samples.

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“…In the spectrum of MT, bands derived from MT or adsorbed H 2 O were observed at 3620 cm À 1 (AlÀ OH), 3443 cm À 1 (OH or H 2 O), 1636 cm À 1 (H 2 O), 1053 cm À 1 (SiÀ O), 935 cm À 1 (OH), 797 cm À 1 (SiÀ O stretching of quartz and silica), and 537 cm À 1 (AlÀ OÀ Si deformation). [38][39][40] In addition to these bands, a CÀ H band attributable to acetic acid appeared at around 2900 cm À 1 in the spectrum of MT/Cu (Figure S2). [41] Meanwhile, the spectrum of MT/PEI500-Cu showed a band due to NÀ H or À CH 2 À at 1462 cm À 1 , which was not detected in the spectra of MT and MT/Cu, suggesting that PEI was successfully intercalated.…”

Section: Synthesis and Characterization Of Cuo X /Clay Nanocompositesmentioning

confidence: 99%

Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation

Takeuchi,

Ohkubo

2023

ChemistrySelect

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Metal oxides have the excellent functions including high thermal stability, electrical properties, catalytic performance, and adsorption properties of acid gases such as CO2 via the acid‐base interactions. However, they suffer from low reserves, porosity control, and low adsorption efficiency per weight compared with lightweight materials including carbon and silica. To solve these issues, various methods for supporting metal oxides on porous carriers, such as decomposition‐precipitation and impregnation, have been investigated, but controlling the formation of metal oxide on clay nanosheets remains as a challenge. Herein, we developed a soft‐template method for supporting metal oxide (CuOx) nanoparticles on activated clay nanosheets. The intercalation of polyethyleneimine (PEI)−Cu2+ complexes between the layers of clay nanosheets followed by calcination to construct CuOx and remove the PEI templates afforded CuOx/clay nanocomposites. The constructed CuOx/clay nanocomposites had the close porosity to that of clay. Tuning the Cu2+/PEI ratio in PEI−Cu2+ complex allowed to control CuOx states (loadings, particle sizes, etc.). Tuning of the supporting conditions allowed constructing a structure suitable for CO2 uptake. These findings will contribute to the development of the material science of metal oxide nanoparticles and their hybrid materials in diverse fields including CO2 adsorbents, energy devices, and catalysts.

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https://www.omicsonline.org/open-access/stimulated-brillouin-scattering-in-highpower-photonic-crystal-fiber-lasers-in-different-pump-schemes-2469-410X-1000170-96476.html

Cited by 23 publications

References 0 publications

Untitled

Untitled

Effects of short-term high-temperature calcinations on the physico-chemical and mineralogical properties of Ca-bentonites from Ünye (Ordu, NE Turkey)

Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation

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https://www.omicsonline.org/open-access/stimulated-brillouin-scattering-in-highpower-photonic-crystal-fiber-lasers-in-different-pump-schemes-2469-410X-1000170-96476.html

Cited by 23 publications

References 0 publications

Untitled

Untitled

Effects of short-term high-temperature calcinations on the physico-chemical and mineralogical properties of Ca-bentonites from Ünye (Ordu, NE Turkey)

Polymer Template Synthesis of CuOx/Clay Nanocomposites with Controllable CuOx Formation

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Polymer Template Synthesis of CuO_x/Clay Nanocomposites with Controllable CuO_x Formation