Restrictions on the Production of Multi-Wall Carbon Nanotubes and Nanofibers by <i>Gallionella sp</i>.

Lv, Kongpeng; Norman, Lucy; Li, Yiliang

doi:10.1080/01490451.2015.1083061

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…The significant positive Eu anomalies are a common feature of Proterozoic distal hydrothermally sourced sedimentary rocks (Cox et al., 2013). Differently, the absence of a significant Eu anomaly in the Yunmengshan IF is consistent with the FeOB mat (Table ), which is clearly sourced from the seeping of Fe(II)‐fluids percolated through the terrestrial rocks nearby (Lv et al., 2016).…”

Section: Discussionsupporting

confidence: 69%

“…It is widely shown that in modern terrestrial iron‐rich seeps or streams, the thriving of FeOB, such as Gallionella , makes iron oxide mats (Chan et al., 2016). The microbial oxidation of Fe(II) by FeOB produces amorphous ferrihydrite predominated ferric iron oxides (Lv et al., 2016). Finally, amorphous ferrihydrite could be dehydrated to a more crystalline form on a geological time scale (Y. L. Li et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…For comparison, five ferric iron oxide (ferrihydrite) mat samples produced by FeOB, were collected at the bottom of the dam of the Low Pond reservoir (N22°15′12.0″, E114°09′37.93″) in Aberdeen Country Park, Hong Kong, which was previously reported in Lv et al (2016). Samples were freeze-dried and stripped of impurities, such as leaves, clasts, etc, under an optic microscope for further chemical analyses.…”

Section: Sampling and Methodsmentioning

confidence: 99%

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Early Prosperity of Iron Bacteria at the End of the Paleoproterozoic Era

Qiu

Qin

Huang

et al. 2022

Geophysical Research Letters

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Various iron formation (IFs) document the interplay between the geosphere and the early biosphere during their co‐evolution. At the transition between the Paleo‐ and Mesoproterozoic eras, the oxidation of the atmosphere and ocean resulted in the waning of the typical marine deposited banded IFs. Here, we report the ∼1.7 Ga Yunmengshan IF at the southern margin of the North China Craton deposited in the intertidal to upper subtidal zone belonging to river delta of coastal environments. The combined REE + Y patterns and negative δ56Fe with positive δ53Cr values reveal terrestrial precipitation of iron oxide and an enhanced continental oxidative weathering at the end of Paleoproterozoic era due to increased atmospheric oxygen level. The oxygen level happened to have facilitated the early prosperity of microaerophilic Fe(II)‐oxidation bacteria on Earth's terrestrial surface, which is recorded by the coastal shallow water iron deposits globally characterized by their small scale and subaerial features.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Sampling and Methodsmentioning

confidence: 99%

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Early Prosperity of Iron Bacteria at the End of the Paleoproterozoic Era

Qiu

Qin

Huang

et al. 2022

Geophysical Research Letters

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“…For observation via transmission electron microscopy, due to low contrast between carbonized polymer dots and carbon-coated copper grids, bright-field images of carbonized polymer dots are seldom sufficiently distinct. There are also concerns about graphitic artifacts in the observed images, which reportedly stem from graphitic contaminants in carbon-coated grids 49 and structural ordering due to electron irradiation during observation. 50 It is essential to resolve the aforementioned points as well as to determine the internal structures of the dots via both spectroscopic and microscopic methods.…”

Section: ■ Introductionmentioning

confidence: 99%

New Insight into Fluorescent Polymeric Carbon Dots for Solid-State Laser Device

Barman

Hernández‐Pinilla

Cretu

et al. 2023

ACS Sustainable Chem. Eng.

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Polymeric carbon dots (PCDs) are an astonishing class of fluorescent materials with distinctive structures, properties, and applications. However, the internal structures of PCDs are still unclear and are the subject of considerable debate due to their complexity. Herein, a new type of pure blue light-emitting PCDs was synthesized hydrothermally from ε-poly-L-lysine and citric acid. PCDs were observed by using scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) on an atomically thin graphene surface to determine the internal structure and compositional gradients combined with other spectroscopic analyses. These methods revealed that PCDs have a spongy, porous structure with uniform element distribution, reflecting organic polymeric frameworks that embrace fluorescent aromatic moieties devoid of graphitic, inorganic carbon. The polymeric framework acts as a transparent matrix and effectively resists self-quenching of photoluminescence (PL) in the solid state. Exploiting their excellent fluorescence properties, PCDs were embedded in a planar microcavity composed of two distributed Bragg reflectors (DBR), which was demonstrated as a single longitudinal solid-state blue laser. The results will facilitate a detailed understanding of internal structures of PCDs and their efficient, solid-state emission toward the development of rare-earth-free lighting devices.

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The Yunmengshan iron formation at the end of the Paleoproterozoic era

Qiu

Zhao

2020

Applied Clay Science

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Restrictions on the Production of Multi-Wall Carbon Nanotubes and Nanofibers by Gallionella sp.

Cited by 4 publications

References 41 publications

Early Prosperity of Iron Bacteria at the End of the Paleoproterozoic Era

Early Prosperity of Iron Bacteria at the End of the Paleoproterozoic Era

New Insight into Fluorescent Polymeric Carbon Dots for Solid-State Laser Device

The Yunmengshan iron formation at the end of the Paleoproterozoic era

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