Low temperature sputtered TiO2 nano sheaths on electrospun PES fibers as high porosity photoactive material

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 73444-73450 ◽  
Author(s):  
A. Alberti ◽  
C. Bongiorno ◽  
G. Pellegrino ◽  
S. Sanzaro ◽  
E. Smecca ◽  
...  
Keyword(s):  
Low Temperature ◽  
Reactive Sputtering ◽  
High Porosity ◽  
Uv Illumination

Low temperature approach based on combining electrospinning and reactive sputtering processes to realise a porous mesh of PES fibers wrapped by TiO2 nano-sheaths, active under UV illumination.

Energy saving technology for sintering of black bricks from high-siliceous clay

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3123-3131
Author(s):  
Mario Flores Nicolas ◽  
Marina Vlasova ◽  
Pedro Antonio Márquez Aguilar ◽  
Mykola Kakazey ◽  
Marcos Mauricio Chávez Cano ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Deficiency ◽  
Glass Ceramics ◽  
Total Content ◽  
Ceramic Materials ◽  
Ternary Mixtures ◽  
High Porosity ◽  
Reducing Conditions ◽  
Binary And Ternary Mixtures ◽  
Dark Color

AbstractThe low-temperature synthesis of bricks prepared from high-siliceous clays by the method of plastic molding of blanks was used. For the preparation of brick blanks, binary and ternary mixtures of high-siliceous clays, black sand, and bottle glass cullet were used. Gray-black low-porosity and high-porosity ceramics was obtained by sintering under conditions of oxygen deficiency. It has been established that to initiate plastic in mixtures containing high-siliceous clay, it is necessary to add montmorillonite/bentonite additives, carry out low-temperature sintering, and introduce low-melting glass additives with a melting point ranging from 750 to 800 °C. The performed investigations have shown that the sintering of mixtures with a total content of iron oxide of about 5 wt% under reducing conditions at Tsint. = 800°C for 8 h leads to the formation of glass ceramics consisting of quartz, feldspars, and a phase. The main sources of the appearance of a dark color is the formation of [Fe3+O4]4- and [Fe3+O6]9- anions in the composition of the glass phase and feldspars. By changing the contents of clay, sand, and glass in sintering, it is possible to obtain two types of ceramic materials: (a) in the form of building bricks and (b) in the form of porous fillers.

scholarly journals Low Temperature Reactive Sputtering of Thin Aluminum Nitride Films on Metallic Nanocomposites

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0133479 ◽  
Author(s):  
Khaled Sayed Elbadawi Ramadan ◽  
Stephane Evoy
Keyword(s):  
Low Temperature ◽  
Aluminum Nitride ◽  
Reactive Sputtering ◽  
Thin Aluminum

Target for a Pb(Zr,Ti)O3Thin Film Deposited at a Low Temperature Using a Quasi-Metallic Mode of Reactive Sputtering

1999 ◽  
Vol 38 (Part 1, No. 12A) ◽  
pp. 6882-6886 ◽  
Author(s):  
Je-Deok Kim ◽  
Shinya Kawagoe ◽  
Kimihiro Sasaki ◽  
Tomonobu Hata
Keyword(s):  
Low Temperature ◽  
Reactive Sputtering

Pore-lining sudoite in Rotliegend sandstones from the eastern part of the Southern Permian Basin

Clay Minerals ◽  
2014 ◽  
Vol 49 (5) ◽  
pp. 635-655 ◽  
Author(s):  
J . Biernacka
Keyword(s):  
Low Temperature ◽  
Intermediate Phase ◽  
High Porosity ◽  
Deep Part ◽  
Rare Occurrence ◽  
Permian Basin ◽  
Dune Field ◽  
Dioctahedral Smectite ◽  
Sw Poland ◽  
Pore Lining

AbstractSudoite, an aluminium-rich di-trioctahedral chlorite, is known primarily from highgrade diagenetic/ low-temperature metamorphic Al-rich rocks and from hydrothermal deposits in Alrich terrains. This contribution reports a rare occurrence of pore-lining sudoite in Permian red beds from the eastern part of the Southern Permian Basin. Sudoite is a ubiquitous mineral in aeolian sandstones of the Eastern Erg, a large dune field buried in the subsurface of the Fore-Sudetic Monocline, SW Poland. Sudoite crystals are arranged in a honeycomb texture and often associated with high-porosity intervals. It is concluded that sudoite crystallized at the expense of early diagenetic dioctahedral smectite at a temperature lower than 180°C under the influence of hot, Mgrich and K-poor fluids, which migrated from a basement and/or deep part of the basin upward through permeable aeolian sandstones and mixed with colder pore solutions. Tosudite was a likely intermediate phase in the smectite to sudoite conversion.

Excitons bound to surface defects in GaN

2002 ◽  
Vol 743 ◽  
Author(s):  
M. A. Reshchikov ◽  
D. Huang ◽  
H. Morkoç
Keyword(s):  
Low Temperature ◽  
Surface Defects ◽  
Acceptor Pair ◽  
Force Microscopy ◽  
Uv Illumination ◽  
Atomic Force ◽  
Subsequent Exposure ◽  
Donor Acceptor ◽  
And Inversion ◽  
Microscopy Images

ABSTRACTSharp intense peaks are sometimes detected in the low-temperature photoluminescence (PL) spectrum of undoped GaN samples in the photon energy range of 3.0 – 3.46 eV. Some of these peaks can be attributed to excitons bound to dislocations and inversion domains, whereas some others originate from the GaN surface because they can be affected essentially by surface treatment. In our samples, grown by molecular beam epitaxy on sapphire substrate, the 3.42 eV peak always disappeared after removing the surface layer by etching for a few seconds in hot phosphoric acid. Atomic force microscopy images confirmed that such light etching modifies the surface morphology, although the etched depth is negligibly small. Moreover, intensities of two other peaks (at 3.32 and 3.35 eV) were observed to depend on sample etching, as well as on the length of subsequent exposure to air. The 3.32 and 3.35 eV peaks evolved with time of UV illumination, increasing by several times and demonstrating memory effect at low temperature. We attribute the 3.42 and 3.35 eV peaks to bound excitons, whereas the 3.32 eV peak is tentatively attributed to a surface donor-acceptor pair transition.

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