A porous ceramic separator prepared from natural minerals: Research on the mechanism of high liquid absorption and electrochemical properties of mineral material separator

ABSTRACTAt present, crystalline ceramic based on titanate pyrochlore, (Ca,Gd,Hf,Pu,U)2Ti2O7, is considered as the US candidate waste form for the immobilization of weapons grade plutonium. Naturally occuring U-bearing minerals with pyrochlore-type structure: hatchettolite, betafite, and ellsworthite, were studied in orders to understand long-term radiation damage effects in Pu ceramic waste forms. Chemical shifts (δ) of U(Lδ1)– and U(Lβ1) – X-ray emission lines were measured by X-ray spectrometry. Calculations were performed on the basis of a two-dimensional δLá1- and δLδ1- correlation diagram. It was shown that 100% of uranium in hatchettolite and, probably, 95-100% of uranium in betafite are in the form of (UO2)2+. formal calculation shows that in ellsworthite only 20% of uranium is in the form of U4+ and 80% of the rest is in the forms of U5+ and U6+. The conversion of the initial U4+ ion originally occurring in the pyrochlore structure of natural minerals to (UO2)2+ due to metamict decay causes a significant increase in uranium mobility.

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MECHANICAL AND ELECTROCHEMICAL PROPERTIES OF TANTALUM IMPLANTED BY NITROGEN IONS

High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes) ◽

10.1615/hightempmatproc.2015015478 ◽

2014 ◽

Vol 18 (1-2) ◽

pp. 143-153 ◽

Cited By ~ 1

Author(s):

A. H. Ramezani ◽

M. R. Hantehzadeh ◽

Mahmoud Ghoranneviss ◽

E. Darabi

Keyword(s):

Electrochemical Properties ◽

Nitrogen Ions

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DEVELOPMENT OF A POROUS CERAMIC-BASED AIR FLOAT PLATFORM FOR LARGE GLASS SUBSTRATES

Special Topics & Reviews in Porous Media An International Journal ◽

10.1615/specialtopicsrevporousmedia.v2.i4.60 ◽

2011 ◽

Vol 2 (4) ◽

pp. 313-321 ◽

Cited By ~ 1

Author(s):

Yeeu-Chang Lee ◽

Chin-Chang Yu ◽

Ruey-Yih Tsai ◽

Jen-Chung Hsiao ◽

Ching-Hao Chen ◽

...

Keyword(s):

Porous Ceramic ◽

Glass Substrates ◽

Large Glass

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Metals Related to Radionuclides and Heavy Metals Removal Using Photosynthetic Bacteria Immobilized Recovery Type Porous Ceramic

Japanese Journal of Water Treatment Biology ◽

10.2521/jswtb.46.119 ◽

2010 ◽

Vol 46 (3) ◽

pp. 119-127 ◽

Cited By ~ 1

Author(s):

KEN SASAKI ◽

CHIHIRO HARA ◽

KENJI TAKENO ◽

HIROSHI OKUHATA ◽

HITOSHI MIYASAKA

Keyword(s):

Heavy Metals ◽

Photosynthetic Bacteria ◽

Porous Ceramic ◽

Heavy Metals Removal ◽

Metals Removal

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Highly Luminescent 4-Pyridyl-Extended Dithieno[3,2-b:2′,3′-d]phospholes

10.26434/chemrxiv.12455357.v1 ◽

2020 ◽

Author(s):

Thomas Baumgartner ◽

Paul Demay-Drouhard

Keyword(s):

Electrochemical Properties ◽

Quantum Yields

The unexpectedly challenging synthesis of 4-pyridyl-extended dithienophospholes is reported. The optical and electrochemical properties of the phosphoryl-bridged species were studied experimentally and computationally, and their properties compared to their non-P-bridged congeners. The 4-pyridyl-extended dithieno-phospholes display quantitative luminescence quantum yields in solution.

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Highly Luminescent 4-Pyridyl-Extended Dithieno[3,2-b:2′,3′-d]phospholes

10.26434/chemrxiv.12455357 ◽

2020 ◽

Author(s):

Thomas Baumgartner ◽

Paul Demay-Drouhard

Keyword(s):

Electrochemical Properties ◽

Quantum Yields

The unexpectedly challenging synthesis of 4-pyridyl-extended dithienophospholes is reported. The optical and electrochemical properties of the phosphoryl-bridged species were studied experimentally and computationally, and their properties compared to their non-P-bridged congeners. The 4-pyridyl-extended dithieno-phospholes display quantitative luminescence quantum yields in solution.

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