scholarly journals Insight into the Degradation Mechanisms of Atomic Layer Deposited TiO2 as Photoanode Protective Layer

2019 ◽  
Vol 11 (33) ◽  
pp. 29725-29735 ◽  
Author(s):  
Carles Ros ◽  
Nina M. Carretero ◽  
Jeremy David ◽  
Jordi Arbiol ◽  
Teresa Andreu ◽  
...  
Keyword(s):  
Protective Layer ◽  
Atomic Layer ◽  
Degradation Mechanisms ◽  
Insight Into

Atomic Layer Deposition of a Nanometer-Thick Li3PO4 Protective Layer on LiNi0.5Mn1.5O4 Films: Dream or Reality for Long-Term Cycling?

2021 ◽  
Vol 13 (13) ◽  
pp. 15761-15773
Author(s):  
Maxime Hallot ◽  
Borja Caja-Munoz ◽  
Clement Leviel ◽  
Oleg I. Lebedev ◽  
Richard Retoux ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Protective Layer ◽  
Atomic Layer ◽  
Layer Deposition

Atomic layer deposition and electrospinning as membrane surface engineering methods for water treatment: a short review

2020 ◽  
Vol 6 (7) ◽  
pp. 1765-1785
Author(s):  
Jieun Lee ◽  
In S. Kim ◽  
Moon-Hyun Hwang ◽  
Kyu-Jung Chae
Keyword(s):  
Water Treatment ◽  
Atomic Layer Deposition ◽  
Surface Engineering ◽  
Membrane Surface ◽  
Atomic Layer ◽  
Short Review ◽  
Review Article ◽  
Future Perspectives ◽  
Layer Deposition ◽  
Insight Into

This review article provides a summary of the application of ALD and electrospinning in membrane processes for water treatment and insight into the technological challenges and future perspectives for their wider application in the membrane industry.

scholarly journals Tuneable Functionalization of Glass Fibre Membranes with ZnO/SnO2 Heterostructures for Photocatalytic Water Treatment: Effect of SnO2 Coverage Rate on the Photocatalytic Degradation of Organics

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 733
Author(s):  
Vincent Rogé ◽  
Joffrey Didierjean ◽  
Jonathan Crêpellière ◽  
Didier Arl ◽  
Marc Michel ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Zno Nanorods ◽  
Protective Layer ◽  
Atomic Layer ◽  
Coverage Rate ◽  
Photocatalytic Properties ◽  
Tight Control ◽  
Electron Hole ◽  
Layer Deposition ◽  
Macroporous Glass

The construction of a ZnO/SnO2 heterostructure is considered in the literature as an efficient strategy to improve photocatalytic properties of ZnO due to an electron/hole delocalisation process. This study is dedicated to an investigation of the photocatalytic performance of ZnO/SnO2 heterostructures directly synthesized in macroporous glass fibres membranes. Hydrothermal ZnO nanorods have been functionalized with SnO2 using an atomic layer deposition (ALD) process. The coverage rate of SnO2 on ZnO nanorods was precisely tailored by controlling the number of ALD cycles. We highlight here the tight control of the photocatalytic properties of the ZnO/SnO2 structure according to the coverage rate of SnO2 on the ZnO nanorods. We show that the highest degradation of methylene blue is obtained when a 40% coverage rate of SnO2 is reached. Interestingly, we also demonstrate that a higher coverage rate leads to a full passivation of the photocatalyst. In addition, we highlight that 40% coverage rate of SnO2 onto ZnO is sufficient for getting a protective layer, leading to a more stable photocatalyst in reuse.

Investigating the effect of salicylate salt in enhancing the corrosion resistance of AZ91 magnesium alloy for biomedical applications

2016 ◽  
Vol 17 (3-4) ◽  
Author(s):  
Adel Francis ◽  
Sannakaisa Virtanen ◽  
Metehan C. Turhan ◽  
Aldo R. Boccaccini
Keyword(s):  
Magnesium Alloy ◽  
Biomedical Applications ◽  
Protective Layer ◽  
Silicate Solution ◽  
Vital Role ◽  
Az91 Magnesium Alloy ◽  
Alloy Az91 ◽  
Magnesium Alloy Az91 ◽  
Az91 Magnesium ◽  
Insight Into

AbstractThe pretreatment process plays a vital role in the development of a robust protective layer on magnesium alloys. This work presents a novel insight into the pretreatment of magnesium alloy AZ91 in alkaline silicate solution by anodic oxidation in the presence of C

scholarly journals The Design of the Emission Layer for Electron Multipliers

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yuman Wang ◽  
Baojun Yan ◽  
Kaile Wen ◽  
Shulin Liu ◽  
Ming Qi ◽  
...  
Keyword(s):  
Secondary Electron Emission ◽  
Protective Layer ◽  
Atomic Layer ◽  
Low Energy ◽  
Main Body ◽  
Empirical Formulas ◽  
Emission Layer ◽  
Spherical System ◽  
Electron Multiplier ◽  
Separate Electron

AbstractThe electron multipliers gain is closely related to the secondary electron emission coefficient (SEE) of the emission layer materials. The SEE is closely related to the thickness of the emission layer. If the emission layer is thin, the low SEE causes the low gain of electron multipliers. If the emission layer is thick, the conductive layer can't timely supplement charge to the emission layer, the electronic amplifier gain is low too. The electron multipliers usually choose Al2O3 and MgO film as the emission layer because of the high SEE level. MgO easy deliquescence into Mg(OH)2 Mg2(OH)2CO3 and MgCO3 resulting in the lower SEE level. The SEE level of Al2O3 is lower than MgO, but Al2O3 is stable. We designed a spherical system for testing the SEE level of materials, and proposed to use low-energy secondary electrons instead of low-energy electron beam for neutralization to measuring the SEE level of Al2O3, MgO, MgO/Al2O3, Al2O3/MgO, and precisely control the film thickness by using atomic layer deposition. We propose to compare the SEE under the adjacent incident electrons energy to partition the SEE value of the material, and obtain four empirical formulas for the relationship between SEE and thickness. Since the main materials that cause the decrease in SEE are Mg2(OH)2CO3 and MgCO3, we use the C element atomic concentration measured by XPS to study the deliquescent depth of the material. We propose to use the concept of transition layer for SEE interpretation of multilayer materials. Through experiments and calculations, we put forward a new emission layer for electron multipliers, including 2–3 nm Al2O3 buffer layer, 5–9 nm MgO main-body layer, 1 nm Al2O3 protective layer or 0.3 nm Al2O3 enhancement layer. We prepared this emission layer to microchannel plate (MCP), which significantly improved the gain of MCP. We can also apply this new emission layer to channel electron multiplier and separate electron multiplier.

Al2O3 and SiO2 Atomic Layer Deposition Layers on ZnO Photoanodes and Degradation Mechanisms

2017 ◽  
Vol 9 (19) ◽  
pp. 16138-16147 ◽  
Author(s):  
Qian Cheng ◽  
Manpuneet K. Benipal ◽  
Qianlang Liu ◽  
Xingye Wang ◽  
Peter A. Crozier ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Degradation Mechanisms ◽  
Layer Deposition

Nano-laminating of SiO2 and TiO2: Atomic layer deposition as a tool to gain new insight into interfaces

2015 ◽  
Vol 1805 ◽  
Author(s):  
Nicolas Sobel ◽  
Christian Hess
Keyword(s):  
Atomic Layer Deposition ◽  
Photoelectron Spectroscopy ◽  
Atomic Layer ◽  
Laminate Structure ◽  
X Ray ◽  
Layer Deposition ◽  
Insight Into ◽  
Good Agreement ◽  
Si Wafer

ABSTRACTAtomic layer deposition (ALD) was used to deposit a laminate structure of alternating SiO2 and TiO2 monolayers onto a Si wafer. The resulting samples were analyzed in detail by X-ray photoelectron spectroscopy (XPS) revealing a distinct O 1s signature due to the presence of Si-O-Ti species. These findings are in good agreement with those reported for thin ALD films of TiO2 grown on SiO2.

scholarly journals Catalytic/Protective Properties of Martian Minerals and Implications for Possible Origin of Life on Mars

Life ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 56 ◽  
Author(s):  
Teresa Fornaro ◽  
Andrew Steele ◽  
John Brucato
Keyword(s):  
Organic Compounds ◽  
Building Blocks ◽  
Life Forms ◽  
Degradation Mechanisms ◽  
Protective Properties ◽  
Origin And Evolution ◽  
Life On Mars ◽  
Insight Into ◽  
Shed Light

Minerals might have played critical roles for the origin and evolution of possible life forms on Mars. The study of the interactions between the “building blocks of life” and minerals relevant to Mars mineralogy under conditions mimicking the harsh Martian environment may provide key insight into possible prebiotic processes. Therefore, this contribution aims at reviewing the most important investigations carried out so far about the catalytic/protective properties of Martian minerals toward molecular biosignatures under Martian-like conditions. Overall, it turns out that the fate of molecular biosignatures on Mars depends on a delicate balance between multiple preservation and degradation mechanisms, often regulated by minerals, which may take place simultaneously. Such a complexity requires more efforts in simulating realistically the Martian environment in order to better inspect plausible prebiotic pathways and shed light on the nature of the organic compounds detected both in meteorites and on the surface of Mars through in situ analysis.

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