The hidden impact of structural water – how interlayer water largely controls the Raman spectroscopic response of birnessite-type manganese oxide

2021 ◽  
Author(s):  
Philipp Scheitenberger ◽  
Holger Euchner ◽  
Mika Linden
Keyword(s):  
Raman Spectroscopy ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Manganese Oxides ◽  
Structural Complexity ◽  
Interlayer Water ◽  
Structural Water ◽  
Raman Spectroscopic ◽  
Electrochemical Applications ◽  
Charge Balancing

Birnessite-type manganese oxides, consisting of stacked MnOx sheets, separated by charge-balancing metal ions and structural water are potential candidates for electrochemical applications. Due to their structural complexity, Raman spectroscopy is...

scholarly journals Biohybrid nanofibers containing manganese oxide–forming fungi for heavy metal removal from water

2020 ◽  
Vol 15 ◽  
pp. 155892501989895
Author(s):  
Yaewon Park ◽  
Shuang Liu ◽  
Terrence Gardner ◽  
Drake Johnson ◽  
Aaron Keeler ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Heavy Metal Ions ◽  
Manganese Oxides ◽  
Metal Removal ◽  
Strong Association ◽  
Heavy Metal Removal ◽  
Fungal Hyphae ◽  
Farm Unit

Manganese-oxidizing fungi support bioremediation through the conversion of manganese ions into manganese oxide deposits that in turn adsorb manganese and other heavy metal ions from the environment. Manganese-oxidizing fungi were immobilized onto nanofiber surfaces to assist remediation of heavy metal–contaminated water. Two fungal isolates, Coniothyrium sp. and Coprinellus sp., from a Superfund site (Lot 86, Farm Unit #1) water treatment system were incubated in the presence of nanofibers. Fungal hyphae had strong association with nanofiber surfaces. Upon fungal attachment to manganese chloride–seeded nanofibers, Coniothyrium sp. catalyzed the conformal deposition of manganese oxide along hyphae and nanofibers, but Coprinellus sp. catalyzed manganese oxide only along its hyphae. Fungi–nanofiber hybrids removed various heavy metals from the water. Heavy metal ions were adsorbed into manganese oxide crystalline structure, possibly by ion exchange with manganese within the manganese oxide. Hybrid materials of fungal hyphae and manganese oxides confined to nanofiber-adsorbed heavy metal ions from water.

Effect of Doping Metal Ions on the Structure Transformation of Octahedral Layer Structure Manganese Oxide

2015 ◽  
Vol 723 ◽  
pp. 670-673
Author(s):  
Chen Liang Zhou ◽  
Bin Zheng Fang ◽  
Jian Wei Cao ◽  
Na Zhang ◽  
Jia Li Han ◽  
...  
Keyword(s):  
Metal Ions ◽  
Manganese Oxide ◽  
Powder Diffraction ◽  
Redox Reactions ◽  
Manganese Oxides ◽  
Layer Structure ◽  
Structure Transformation ◽  
Octahedral Layer ◽  
X Ray ◽  
Before And After

The Octahedral layer structure manganese oxides (Buserite and Birnessite) have been synthesized and modified by aging a MnOx gel which was produced from the redox reactions between Mn2+ and MnO4- in the presence of other metal cations (Mg2+, Ni2+, Co2+ or Cu2+). The present study investigates the structure transformation between Buserite and Birnessite using X-ray powder diffraction conducted on cation doped manganese oxides at different stages of before and after hydration. The results indicate that introduction of Mg2+ into the interlayer can completely achieve the structure transformation between Birnessite and Buserite after hydrated at 24h, and Ni2+ can partially reverse.

scholarly journals Structural complexity of(Na0.5Bi0.5)TiO3-BaTiO3as revealed by Raman spectroscopy

2010 ◽  
Vol 82 (10) ◽  
Author(s):  
Ben Wylie-van Eerd ◽  
Dragan Damjanovic ◽  
Naama Klein ◽  
Nava Setter ◽  
Joe Trodahl
Keyword(s):  
Raman Spectroscopy ◽  
Structural Complexity

Mapping gold nanoparticles on and in edible leaves in situ using surface enhanced Raman spectroscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60152-60159 ◽  
Author(s):  
Zhiyun Zhang ◽  
Huiyuan Guo ◽  
Yingqing Deng ◽  
Baoshan Xing ◽  
Lili He
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Mapping Technique ◽  
Raman Spectroscopic ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Spinach Leaves

A surface enhanced Raman spectroscopic (SERS) mapping technique was applied to qualitatively detect and characterize gold nanoparticles on and in spinach leaves in situ.

A Furnace for Molten Salt Raman Spectroscopy to 800°C

1971 ◽  
Vol 25 (1) ◽  
pp. 82-84 ◽  
Author(s):  
Arvin S. Quist
Keyword(s):  
Raman Spectroscopy ◽  
Laser Beam ◽  
Molten Salts ◽  
Spectroscopic Studies ◽  
Sample Container ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Different Types ◽  
Sample Chamber ◽  
Metal Block

A vacuum tight furnace has been constructed and used for laser-Raman spectroscopic studies of molten salts to 800°C. The sample container is positioned within the furnace by a removable metal block, several designs of which have been used with different types of sample containers. The sample under investigation is easily and rapidly aligned in the laser beam by means of micrometer screws located on the positioning table which supports the furnace. The compactness of the entire unit allows it to be readily moved into and out of the sample chamber of the spectrometer.

Lichen biomarkers upon heating: a Raman spectroscopic study with implications for extra-terrestrial exploration

2016 ◽  
Vol 16 (1) ◽  
pp. 74-81 ◽  
Author(s):  
I. Miralles ◽  
C. Capel Ferrón ◽  
V. Hernández ◽  
J. T. López-Navarrete ◽  
S. E. Jorge-Villar
Keyword(s):  
Raman Spectroscopy ◽  
Inorganic Compounds ◽  
Outer Space ◽  
European Space Agency ◽  
Usnic Acid ◽  
Spectral Signature ◽  
Raman Spectroscopic ◽  
Space Agency ◽  
Calcium Oxalates ◽  
Short Time

AbstractLithopanspermia Theory has suggested that life was transferred among planets by meteorites and other rocky bodies. If the planet had an atmosphere, this transfer of life had to survive drastic temperature changes in a very short time in its entry or exit. Only organisms able to endure such a temperature range could colonize a planet from outer space. Many experiments are being carried out by NASA and European Space Agency to understand which organisms were able to survive and how. Among the suite of instruments designed for extraplanetary exploration, particularly for Mars surface exploration, a Raman spectrometer was selected with the main objective of looking for life signals. Among all attributes, Raman spectroscopy is able to identify organic and inorganic compounds, either pure or in admixture, without requiring sample manipulation. In this study, we used Raman spectroscopy to examine the lichen Squamarina lentigera biomarkers. We analyse spectral signature changes after sample heating under different experimental situations, such as (a) laser, (b) analysis accumulations over the same spot and (c) environmental temperature increase. Our goal is to evaluate the capability of Raman spectroscopy to identify unambiguously life markers even if heating has induced spectral changes, reflecting biomolecular transformations. Usnic acid, chlorophyll, carotene and calcium oxalates were identified by the Raman spectra. From our experiments, we have seen that usnic acid, carotene and calcium oxalates (the last two have been suggested to be good biomarkers) respond in a different way to environmental heating. Our main conclusion is that despite their abundance in nature or their inorganic composition the resistance to heat makes some molecules more suitable than others as biomarkers.

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