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1. The formation mechanism of reverted austenite in Mn-based maraging steels

Author:
Qian, Feng; Rainforth, W. Mark
Source:
Journal of materials science 2019 v.54 no.8 pp. 6624-6631
ISSN:
0022-2461
Subject:
manganese,   etc   ; diffusivity; microstructure; steel;     Show all 4 Subjects
Abstract:
... Based on the microstructural evolution in Mn-based maraging steels aged at 460–540 °C, the formation mechanism of reverted austenite is proposed. Reverted austenite formed at grain boundaries at the onset of aging. During further aging, the accumulated Mn enrichment at newly formed [Formula: see text] interfaces led to thin austenite layers growing into lath-like austenite grains. The lateral grow ...
DOI:
10.1007/s10853-019-03319-9

2. Facile and reversible double dearomatization of pyridines in non-phosphine Mnᴵ complexes with N,S-donor pyridinophane ligand

Author:
SarbajnaThese authors made equal contributions., Abir; Patil, Pradnya H.; Dinh, Minh Hoan; Gladkovskaya, Olga; Fayzullin, Robert R.; Lapointe, Sébastien; Khaskin, Eugene; Khusnutdinova, Julia R.
Source:
Chemical communications 2019 v.55 no.22 pp. 3282-3285
ISSN:
1364-548X
Subject:
manganese,   etc   ; deprotonation; ligands; pyridines;     Show all 4 Subjects
Abstract:
... Single and double dearomatization of pyridine rings was observed in Mnᴵ complexes with an N2S2 pyridinophane ligand via deprotonation of one or two CH₂ arms, respectively. In contrast to other N,S-donor pincer-like systems, the dearomatized (N2S2)Mn species were found to be stable, with the dearomatization being reversible. ...
DOI:
10.1039/c9cc00424f

3. RETRACTION: Synthesis and characterization of Mn/Co/Ti LDH and its utilization as a photocatalyst in visible light assisted degradation of aqueous Rhodamine B

Author:
Shore, Andrew
Source:
RSC advances 2019 v.9 no.10 pp. 5557
ISSN:
2046-2069
Subject:
manganese,   etc   ; cobalt; photocatalysts; rhodamines;     Show all 4 Subjects
Abstract:
... Retraction of ‘Synthesis and characterization of Mn/Co/Ti LDH and its utilization as a photocatalyst in visible light assisted degradation of aqueous Rhodamine B’ by Priyadarshi Roy Chowdhury and Krishna G. Bhattacharyya, RSC Adv., 2016, 6, 112016–112034. ...
DOI:
10.1039/c9ra90011j

4. Switchable Aromaticity in an Isostructural Mn Phthalocyanine Series Isolated in Five Separate Redox States

Author:
Hunt, Camden; Peterson, Madeline; Anderson, Cassidy; Chang, Tieyan; Wu, Guang; Scheiner, Steve; Ménard, Gabriel
Source:
Journal of the American Chemical Society 2019 v.141 no.6 pp. 2604-2613
ISSN:
1520-5126
Subject:
manganese,   etc   ; models; oxidation; spectroscopy;     Show all 4 Subjects
Abstract:
... The synthesis and characterization of a new phthalocyanine (Pc) Mn-nitride complex, (ᴼᴱᵗPc)MnN (2; ᴼᴱᵗPc = 1,4,8,11,15,18,22,25-octaethoxy-Pc), as well as its stable, readily accessible oxidized (2⁺ and 2²⁺) and reduced (2–, 2²–) congeners is reported. This unique isostructural series displays switchable aromatic character spanning the aromatic (2), nonaromatic (2²⁺), and antiaromatic (2²–) triad, ...
DOI:
10.1021/jacs.8b12899

5. Concurrent Removal of Mn(II) and Cr(VI) by Achromobacter sp. TY3-4

Author:
Yin, Yajie; Li, Dou; Wang, Yangqing; Xu, Zhonghui; Xu, Guojing; Zhao, Ziqiang; Li, Shan; Song, Liyan
Source:
Geomicrobiology journal 2019 v.36 no.4 pp. 317-325
ISSN:
1521-0529
Subject:
manganese; manganese oxides,   etc   ; Achromobacter; aerobic conditions; bacteria; chromium;     Show all 6 Subjects
Abstract:
... In this study, we report a bacterium, Achromobacter sp. TY3-4, capable of concurrently removing Mn (II) and Cr (VI) under oxic condition. TY3-4 reduced as much as 2.31 mM of Cr (VI) to Cr (III) in 70 h, and oxidized as much as 20 mM of Mn(II) to Mn oxides in 80 h. When 0.58 mM Cr (VI) and 10 mM Mn(II) were present together, both Cr(VI) and Mn(II) were completely removed by TY3-4 and the generated ...
DOI:
10.1080/01490451.2018.1544324

6. New Insights into the Combination of Permanganate and Bisulfite as a Novel Advanced Oxidation Process: Importance of High Valent Manganese-Oxo Species and Sulfate Radical

Author:
Gao, Yuan; Zhou, Yang; Pang, Su-Yan; Jiang, Jin; Yang, Zhifeng; Shen, Yongming; Wang, Zhen; Wang, Pan-Xin; Wang, Li-Hong
Source:
Environmental science & technology 2019 v.53 no.7 pp. 3689-3696
ISSN:
1520-5851
Subject:
manganese; manganese dioxide,   etc   ; bisulfites; decontamination; hydroxylation; oxidation; pH; polymers; sulfates;     Show all 9 Subjects
Abstract:
... Recently, it has been reported that the combination of permanganate (Mn(VII)) and bisulfite can lead to a rapid degradation of organic contaminants, where soluble Mn(III) is proposed to be responsible. Interestingly, in this work, we demonstrated the involvement of high-valent Mn-oxo species (possibly Mn(V)) as well as sulfate radical in the Mn(VII)/bisulfite system, by using methyl phenyl sulfoxi ...
DOI:
10.1021/acs.est.8b05306

7. Performance of colorimetric methods for the analysis of low levels of manganese in water

Author:
Hatat-Fraile, M.M.; Barbeau, B.
Source:
Talanta 2019 v.194 pp. 786-794
ISSN:
0039-9140
Subject:
manganese; manganese dioxide,   etc   ; calcium; cations; colorimetry; ligands; porphyrins; spectroscopy;     Show all 8 Subjects
Abstract:
... The present paper describes a laboratory investigation conducted with the main aim to compare two colorimetric methods (1-(2-pyridylazo)-2-naphthol (PAN) from HACH® and porphyrin ligand (T-(4CP)P)) with ICP analyses for the evaluation of low concentrations of manganese in water. The colorimetric porphyrin method was found to provide reliable results compared to those obtained by inductively couple ...
DOI:
10.1016/j.talanta.2018.11.003

8. Anomalous Chromophore Disruption Enables an Eight-Step Synthesis and Stereochemical Reassignment of (+)-Marineosin A

Author:
Feng, Zhengao; Allred, Tyler K.; Hurlow, Evan E.; Harran, Patrick G.
Source:
Journal of the American Chemical Society 2019 v.141 no.6 pp. 2274-2278
ISSN:
1520-5126
Subject:
manganese,   etc   ; constitutional isomers; diastereomers; stereochemistry;     Show all 4 Subjects
Abstract:
... An eight-step asymmetric synthesis of (+)-marineosin A is described. The route proceeds by condensing fragments of reversed polarity relative to conventional prodiginine constructions. The resultant unstable chromophore is disrupted by a unique cycloisomerization promoted at a tailored manganese surface. This provides a premarineosin and subsequently marineosin A in a particularly concise manner. ...
DOI:
10.1021/jacs.9b00396

9. Upscale and characterization of lignin-modifying enzymes from Marasmiellus palmivorus VE111 in a bioreactor under parameter optimization and the effect of inducers

Author:
Schneider, William Daniel Hahn; Costa, Paula Cavion; Fontana, Roselei Claudete; de Siqueira, Félix Gonçalves; Pinheiro Dillon, Aldo José; Camassola, Marli
Source:
Journal of biotechnology 2019 v.295 pp. 1-8
ISSN:
0168-1656
Subject:
manganese; manganese peroxidase; manganese sulfate,   etc   ; Marasmiellus; bioreactors; copper; copper sulfate; enzyme activity; laccase; oxygen; pH; temperature;     Show all 12 Subjects
Abstract:
... Testing different pHs, dissolved oxygen concentrations and temperatures, plus the addition of inducers, to optimize ligninolytic enzyme activity, resulted in increased production of laccases, total peroxidases and manganese peroxidases on the order of 2.1-fold, 4.6-fold and 10-fold, respectively; laccases reached 6588 U/mL, total peroxidases reached 3533 U/mL and manganese peroxidase achieved 60 U ...
DOI:
10.1016/j.jbiotec.2019.03.002

10. Manganese doped CdS sensitized graphene/Cu2MoS4 composite for the photoelectrochemical immunoassay of cardiac troponin I

Author:
Chi, Huitong; Han, Qingzhi; Chi, Tianhe; Xing, Bin; Ma, Ning; Wu, Dan; Wei, Qin
Source:
Biosensors & bioelectronics 2019 v.132 pp. 1-7
ISSN:
0956-5663
Subject:
manganese,   etc   ; graphene; immunoassays; immunosensors; nanoparticles; troponin I;     Show all 6 Subjects
Abstract:
... As a newly emerged photoactive material, Cu2MoS4 has motivated wide research interests in the field of photoelectrochemistry. Based on manganese doped CdS (CdS:Mn) sensitized graphene (G)/Cu2MoS4 composite, we developed a label-free photoelectrochemical (PEC) immunosensor for the detection of cardiac troponin I (cTnI). G as an excellent 2D conductive material, combined with Cu2MoS4 could improve i ...
DOI:
10.1016/j.bios.2019.02.048

11. Effect of Sb content on anisotropic magnetoresistance in a (Ga, Mn)(As, Sb) ferromagnetic semiconductor thin film

Author:
Wang, Wenjie; Chen, Jing; Deng, Jiajun; Che, Jiantao; Hu, Bing; Cheng, Xin
Source:
RSC advances 2019 v.9 no.19 pp. 10776-10780
ISSN:
2046-2069
Subject:
manganese,   etc   ; anisotropy; antimony; arsenic; gallium; semiconductors;     Show all 6 Subjects
Abstract:
... The effect of Sb content on the in-plane anisotropic magnetoresistance (AMR) of the quaternary ferromagnetic semiconductor (Ga, Mn)(As, Sb) was investigated. The results showed that the strain increased with Sb content, but the hole density was found to fluctuate. Dominant cubic and uniaxial symmetries were observed for the current along the [110] crystalline direction. The dependence of the symme ...
DOI:
10.1039/c8ra10256b

12. Mn(III)-promoted synthesis of spiroannular tricyclic scaffolds via sulfonylation/dearomatization of biaryl ynones

Author:
Zhou, Li; Xia, Yu; Wang, Yu-Zhao; Fang, Jun-Dan; Liu, Xue-Yuan
Source:
Tetrahedron 2019 v.75 no.9 pp. 1267-1274
ISSN:
0040-4020
Subject:
manganese,   etc   ; moieties; organic compounds; protocols; sodium; sulfonylation;     Show all 6 Subjects
Abstract:
... A Mn(III)-promoted radical oxidative ipso-annulation reaction of biaryl ynones with sodium sulfinates to construct various substituted spiro[5.5]trienones has been explored in this study. This protocol is characterized by mild reaction conditions, good substrates functional group compatibility, cheap and easily prepared Mn(OAc)3·2H2O, and it demonstrates a simple operation. ...
DOI:
10.1016/j.tet.2019.01.041

13. Novel red-emitting phosphor Li₂MgZrO₄:Mn⁴⁺,Ga³⁺ for warm white LEDs based on blue-emitting chip

Author:
Yan, Wen; Xiao, Siguo; Yang, Xiaoliang
Source:
RSC advances 2019 v.9 no.10 pp. 5354-5361
ISSN:
2046-2069
Subject:
manganese,   etc   ; gallium; ions; luminescence; thermal stability;     Show all 5 Subjects
Abstract:
... Li₂MgZrO₄:Mn⁴⁺,Ga³⁺ phosphors are synthesized via a conventional high-temperature solid-state reaction. The red emission of Mn⁴⁺ is enhanced 6.68 times and 13.0 times under 352 nm and 468 nm excitation when Ga³⁺ ions with a concentration of 40% are introduced into the phosphor. The thermal stability of the phosphor is also slightly improved by Ga³⁺ doping. It is believed that the GaZᵣ dopants in t ...
DOI:
10.1039/c8ra09933b

14. Mn-Mediated Electrochemical Trifluoromethylation/C(sp²)–H Functionalization Cascade for the Synthesis of Azaheterocycles

Author:
Zhang, Zhenxing; Zhang, Lei; Cao, Yang; Li, Feng; Bai, Guangcan; Liu, Guoquan; Yang, Yang; Mo, Fanyang
Source:
Organic letters 2019 v.21 no.3 pp. 762-766
ISSN:
1523-7052
Subject:
manganese,   etc   ; electrochemistry; moieties; organic compounds; oxidation; salts;     Show all 6 Subjects
Abstract:
... A general electrohemical strategy for the combined trifluoromethylation/C(sp²)–H functionalization using Langlois’ reagent as the CF₃ source under oxidant-free conditions was developed. Using Mn salts as the redox mediator, this method provides an efficient and sustainable means to access a variety of functionalized heterocycles bearing a CF₃ moiety. Detailed mechanistic studies are consistent wit ...
DOI:
10.1021/acs.orglett.8b04010

15. Manganese catalyzed α-methylation of ketones with methanol as a C1 source

Author:
Bruneau-Voisine, Antoine; Pallova, Lenka; Bastin, Stéphanie; César, Vincent; Sortais, Jean-Baptiste
Source:
Chemical communications 2019 v.55 no.3 pp. 314-317
ISSN:
1364-548X
Subject:
manganese,   etc   ; chemical reactions; esters; hydrogen; ketones; methanol;     Show all 6 Subjects
Abstract:
... The direct α-methylation of ketones with methanol under hydrogen borrowing conditions using a well-defined manganese PN³P complex as a pre-catalyst was, for the first time, achieved. The reactions typically proceed at 120 °C for 20 h with 3 mol% pre-catalyst loading and in the presence of NaOtBu (50 mol%) as base. The scope of the reaction was extended to the α-methylation of esters. ...
DOI:
10.1039/c8cc08064j

16. Microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and manganese ore

Author:
Li, Kangqiang; Chen, Jin; Chen, Guo; Peng, Jinhui; Ruan, Roger; Srinivasakannan, C.
Source:
Bioresource technology 2019 v.286 pp. 121381
ISSN:
0960-8524
Subject:
manganese; manganese dioxide,   etc   ; biomass; dielectric properties; microwave treatment; mixing ratio; pyrolysis; temperature; walnut hulls;     Show all 9 Subjects
Abstract:
... In this work, dielectric properties and thermochemical characteristics of mixtures of walnut shell and manganese ore were systematically investigated. Results indicated that reducing manganese ore by walnut shell was divided into four stages identified by temperatures: <150 °C, 150 °C–300 °C, 300 °C–480 °C, greater than 480 °C. Higher than 200 °C, the dielectric constants (εr′), dielectric loss fa ...
DOI:
10.1016/j.biortech.2019.121381

17. Colonization, penetration and transformation of manganese oxide nodules by Aspergillus niger

Author:
Ferrier, John; Yang, Yuyi; Csetenyi, Laszlo; Gadd, Geoffrey Michael
Source:
Environmental microbiology 2019 v.21 no.5 pp. 1821-1832
ISSN:
1462-2912
Subject:
manganese; manganese oxides,   etc   ; Aspergillus niger; bioprocessing; calcium oxalate; fungi; liquids; mycelium; pellets;     Show all 9 Subjects
Abstract:
... In this study, the ability of the geoactive fungus Aspergillus niger to colonize and transform manganese nodules from the Clarion‐Clipperton Zone in both solid and liquid media was investigated. Aspergillus niger was able to colonize and penetrate manganese nodules embedded in solid medium and effect extensive transformation of the mineral in both fragmented and powder forms, precipitating mangane ...
DOI:
10.1111/1462-2920.14591

18. Elemental mercury removal over a novel starch-modified MnOx/bentonite composite

Author:
Zhou, Zijian; Liu, Xiaowei; Xu, Jie; Cao, Xiangkun Elvis; Zhu, Xinbo
Source:
Fuel processing technology 2019 v.187 pp. 16-20
ISSN:
0378-3820
Subject:
manganese; manganese oxides,   etc   ; adsorption; bentonite; mercury; moieties; oxidation; oxygen; potassium permanganate; sorbents; starch; surface area;     Show all 12 Subjects
Abstract:
... To improve the activity of elemental mercury (Hg0) removal over the bentonite supported MnOx material (MnOx/bentonite), a novel starch-modified MnOx/bentonite composite (MnOx/starch-bentonite) was synthesized for Hg0 capture. The Hg0 removal activity tested under the atmosphere of pure N2 and in the presence of O2 showed that the MnOx/starch-bentonite exhibited better activity and stability than M ...
DOI:
10.1016/j.fuproc.2019.01.006

19. Activated carbon supported MnO2 for catalytic degradation of reactive black 5

Author:
Saroyan, Hayarpi S.; Arampatzidou, Anastasia; Voutsa, Dimitra; Lazaridis, Nikolaos K.; Deliyanni, Eleni A.
Source:
Colloids and surfaces 2019 v.566 pp. 166-175
ISSN:
0927-7757
Subject:
manganese; manganese dioxide,   etc   ; activated carbon; catalysts; catalytic activity; colloids; hydrogen peroxide; nanoparticles; surface area; synthesis;     Show all 10 Subjects
Abstract:
... In the present work, a commercial activated carbon was impregnated with MnO2 through a facile and efficient one-pot synthesis method. The impregnated carbon was characterized for the Mn content, the textural characteristics, the surface chemistry and the efficiency for removal and degradation of RB5. The MnO2 nanoparticles with an average size of 35 nm, were homogeneously dispersed in the carbon m ...
DOI:
10.1016/j.colsurfa.2019.01.025

20. A novel manganese oxidizing bacterium-Aeromonas hydrophila strain DS02: Mn(II) oxidization and biogenic Mn oxides generation

Author:
Zhang, Yue; Tang, Yankui; Qin, Zhiyi; Luo, Penghong; Ma, Zhou; Tan, Mengying; Kang, Houyao; Huang, Zhining
Source:
Journal of hazardous materials 2019 v.367 pp. 539-545
ISSN:
0304-3894
Subject:
manganese; manganese oxides,   etc   ; Aeromonas hydrophila; X-ray photoelectron spectroscopy; bacteria; oxidation; sediments;     Show all 7 Subjects
Abstract:
... The extensive applications of biogenic manganese oxides (BioMnOx) generated by manganese oxidizing bacteria (MOB) have attracted considerable attentions. In this study, we report on a novel MOB that has been isolated from sediments and identified as Aeromonas hydrophila strain DS02. The Mn(II) oxidation activity of strain DS02 under Mn(II) stress and the application of the associated BioMnOx produ ...
DOI:
10.1016/j.jhazmat.2019.01.012