scholarly journals Enhanced Reactivity toward Oxidation by Water Vapor: Interactions of Toluene and NO2 on Hydrated Magnetite Nanoparticles

2014 ◽  
Vol 118 (41) ◽  
pp. 23654-23663 ◽  
Author(s):  
Nermin Eltouny ◽  
Parisa A. Ariya
Keyword(s):  
Water Vapor ◽  
Magnetite Nanoparticles ◽  
Oxidation By Water

Kinetic model of Al oxidation by water vapor in heterogeneous plasma: Heterophase kinetics

2015 ◽  
Vol 53 (1) ◽  
pp. 21-26 ◽  
Author(s):  
V. A. Bityurin ◽  
A. I. Klimov ◽  
O. V. Korshunov ◽  
V. F. Chinnov
Keyword(s):  
Water Vapor ◽  
Kinetic Model ◽  
Oxidation By Water

Kinetic model of aluminum oxidation by water vapor in heterogeneous plasma: Gas-phase kinetics

2014 ◽  
Vol 52 (5) ◽  
pp. 621-626 ◽  
Author(s):  
V. A. Bityurin ◽  
A. I. Klimov ◽  
O. V. Korshunov ◽  
V. F. Chinnov
Keyword(s):  
Water Vapor ◽  
Kinetic Model ◽  
Gas Phase ◽  
Aluminum Oxidation ◽  
Gas Phase Kinetics ◽  
Oxidation By Water

Nanocomposite hollow fiber membranes with recyclable β-cyclodextrin encapsulated magnetite nanoparticles for water vapor separation

2018 ◽  
Vol 6 (47) ◽  
pp. 24569-24579 ◽  
Author(s):  
Ali M. Abou-Elanwar ◽  
Yogita M. Shirke ◽  
Pravin G. Ingole ◽  
Won-Kil Choi ◽  
Hyojin Lee ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Vapor ◽  
Magnetite Nanoparticles ◽  
Hollow Fiber ◽  
Interfacial Polymerization ◽  
Hollow Fibers ◽  
Polymerization Reaction ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
Co Precipitation

Recyclable βCD-Fe3O4nanoparticles are successfully synthesized by the co-precipitation and incorporated into thin-film polyamide membranes by interfacial polymerization reaction between DETA and TMC on the surface of PSf hollow fibers.

Experimental Studies on Water Vapor Plasma Oxidation and Thermal Oxidation of 4H-SiC (0001) for Clarification of the Atomic-Scale Flattening Mechanism in Plasma Assisted Polishing

2014 ◽  
Vol 778-780 ◽  
pp. 587-590
Author(s):  
Hui Deng ◽  
Katsuyoshi Endo ◽  
Kazuya Yamamura
Keyword(s):  
Water Vapor ◽  
Thermal Oxidation ◽  
Oxide Layer ◽  
Removal Rate ◽  
Experimental Studies ◽  
High Hardness ◽  
Atomic Scale ◽  
Plasma Oxidation ◽  
Initial Oxidation ◽  
Oxidation By Water

4H-SiC is difficult to be polishing due to its high hardness and chemical inertness. We proposed a novel polishing technique named plasma assisted polishing (PAP), in which oxidation by water plasma and polishing soft abrasive were combined. In order to increase the material removal rate of PAP and clarify the atomic-scale flattening mechanism, experimental studies on water vapor plasma oxidation and thermal oxidation of 4H-SiC (0001) were conducted. Experimental results indicated that the initial oxidation rate of water vapor plasma oxidation (185 nm/h) was much higher than that of thermal oxidation (29nm/h). In the case of water vapor plasma oxidation, the oxide/SiC interface was rough when the oxide layer was thin and it became flatter along with the increase of the thickness of the oxide layer. In contrast, the oxide/SiC interface was atomically flat regardless of the thickness of the oxide layer in the case of thermal oxidation. CeO2 abrasive polishing was conducted on the oxidized SiC surfaces, well-ordered step/terrace structures were obtained in both cases. The step height was about 0.25 nm, which corresponds to a one-bilayer structure of 4H-SiC.

New Design for a Differentially Pumped Hydration Chamber for a Siemens IA

1971 ◽  
Vol 29 ◽  
pp. 44-45
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Electron Microscopy ◽  
Water Vapor ◽  
Electron Diffraction ◽  
Water Vapor Pressure ◽  
Biological Materials ◽  
Thin Membrane ◽  
Reliable System ◽  
System A ◽  
Water Films ◽  
Aperture Opening

Electron microscopy and diffraction of biological materials in the hydrated state requires the construction of a chamber in which the water vapor pressure can be maintained at saturation for a given specimen temperature, while minimally affecting the normal vacuum of the remainder of the microscope column. Initial studies with chambers closed by thin membrane windows showed that at the film thicknesses required for electron diffraction at 100 KV the window failure rate was too high to give a reliable system. A single stage, differentially pumped specimen hydration chamber was constructed, consisting of two apertures (70-100μ), which eliminated the necessity of thin membrane windows. This system was used to obtain electron diffraction and electron microscopy of water droplets and thin water films. However, a period of dehydration occurred during initial pumping of the microscope column. Although rehydration occurred within five minutes, biological materials were irreversibly damaged. Another limitation of this system was that the specimen grid was clamped between the apertures, thus limiting the yield of view to the aperture opening.

Hydration Chamber for Jeolco 200 Kv Microscope

1970 ◽  
Vol 28 ◽  
pp. 542-543
Author(s):  
V. R. Matricardi ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Electron Microscope ◽  
Water Vapor ◽  
Vapor Pressure ◽  
Pressure Gradient ◽  
Room Temperature ◽  
List Type ◽  
Type Number ◽  
Equilibrium Vapor Pressure

In order to observe room temperature hydrated specimens in an electron microscope, the following conditions should be satisfied: The specimen should be surrounded by water vapor as close as possible to the equilibrium vapor pressure corresponding to the temperature of the specimen.The specimen grid should be inserted, focused and photo graphed in the shortest possible time in order to minimize dehydration.The full area of the specimen grid should be visible in order to minimize the number of changes of specimen required.There should be no pressure gradient across the grid so that specimens can be straddled across holes.Leakage of water vapor to the column should be minimized.

Warm and freeze-fracture of cotton seed radicles

1987 ◽  
Vol 45 ◽  
pp. 984-985
Author(s):  
E. L. Vigil ◽  
E. F. Erbe
Keyword(s):  
Thin Film ◽  
Water Vapor ◽  
Fracture Surface ◽  
Membrane Structure ◽  
Room Temperature ◽  
Freeze Fracture ◽  
Longitudinal Axis ◽  
Fracture Plane ◽  
Cotton Seeds ◽  
Condensed Water

In cotton seeds the radicle has 12% moisture content which makes it possible to prepare freeze-fracture replicas without fixation or cryoprotection. For this study we have examined replicas of unfixed radicle tissue fractured at room temperature to obtain data on organelle and membrane structure.Excised radicles from seeds of cotton (Gossyplum hirsutum L. M-8) were fractured at room temperature along the longitudinal axis. The fracture was initiated by spliting the basal end of the excised radicle with a razor. This procedure produced a fracture through the tissue along an unknown fracture plane. The warm fractured radicle halves were placed on a thin film of 100% glycerol on a flat brass cap with fracture surface up. The cap was rapidly plunged into liquid nitrogen and transferred to a freeze- etch unit. The sample was etched for 3 min at -95°C to remove any condensed water vapor and then cooled to -150°C for platinum/carbon evaporation.

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