Pack Aluminization Assisted Enhancement of Thermo-mechanical Properties in Nickel Inverse Opal Structures

Shetty, Pralav P.; Zhang, Runyu; Angle, Jesse P.; Krogstad, Jessica A.

doi:10.1021/acs.chemmater.7b04988

Cited by 11 publications

(10 citation statements)

References 37 publications

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“…As outlined in Figure a–d, polystyrene spheres were self-assembled on a gold coated sapphire substrate, followed by electrodeposition of Ni to half the sphere diameter, and dissolution of the polystyrene. More details about the electrodeposition conditions of the IOs can be found in a previous study . The average roughness of the IOs was selected to be 250, 500, and 800 nm by varying the polystyrene sphere diameter.…”

Section: Methodsmentioning

confidence: 99%

“…More details about the electrodeposition conditions of the IOs can be found in a previous study. 35 The average roughness of the IOs was selected to be 250 nm, 500 nm, and 800 nm by varying the polystyrene sphere diameter. The surfaces of certain X65 coupons and the IOs were passivated using atomic layer deposition (ALD) alumina [Savannah S100, Cambridge Nanotech].…”

Section: B Metallographic Surface Preparation and Alumina Passivationmentioning

confidence: 99%

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Effect of Surface Chemistry and Roughness on the High-Temperature Deposition of a Model Asphaltene

et al. 2019

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Fouling of processing units because of asphaltene deposition is a common phenomenon that interrupts the operation of oil refineries. In this study, the deposition behavior of a model archipelago asphaltene was investigated in the temperature range of 150 o C to 350 o C. For a fixed surface chemistry, the differences in deposit chemistry with fouling temperature is a function of the thermochemical properties of the model asphaltene. Under static high pressure and high temperature fouling conditions, both surface roughness and chemistry play an important role in asphaltene deposition. Rough surfaces are shown to develop larger deposits because of less restrictive physical barriers to inhibit deposit growth. Passivating the surface with an alumina chemistry significantly reduces the impact of surface roughness, as well as the total amount of deposition. This beneficial effect of using a protective alumina chemistry is attributed to its high thermal stability and low diffusivity that inhibit the uncontrolled formation of thiolate and sulfide deposits that are found on unpassivated steels. Instead, alumina modifies the surface reaction to a self-limiting chemisorption and oxidation process that produces thin sulfate deposits at the surface. With further consideration to the reactive species present in solution, the findings of this study may be extended to determine suitable surface conditions that mitigate asphaltene fouling.

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Section: Methodsmentioning

confidence: 99%

Section: B Metallographic Surface Preparation and Alumina Passivationmentioning

confidence: 99%

Effect of Surface Chemistry and Roughness on the High-Temperature Deposition of a Model Asphaltene

et al. 2019

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“…The final structure is a highly ordered array of sharp Ni tips with height h , determined by the PS radius, and radius of curvature ρ of 5–10 nm. Based on prior work, the fabricated nickel tip array features very little contamination . This work demonstrates a solution‐based processing approach to create uniform, metallic, sharp tips with an unprecendented level of geometric control via an inverse opal template.…”

Section: Inverse Opal Field Emission Device Fabricationmentioning

confidence: 96%

Field Emitters Using Inverse Opal Structures

Jones

Zhang

Murty

et al. 2019

Adv Funct Materials

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Electronics to be used in space must often perform in high temperature or radiation hard environments that render conventional solid-state technologies unable to meet mission requirements. As a result, microscale and nanoscale field emission devices are being explored as fundamental components of electronics capable of operating in these harsh environments. Wide scale implementation of these devices is hindered by the difficulty of fabricating large, mechanically stable, uniform arrays of sharp emitting tips. This work presents a scalable method to produce uniform arrays of field emitting tips. Polystyrene spheres are applied as a template for electrochemical deposition. An electrochemical etching process is developed to sharpen tips to a radius of curvature of 5-10 nm, optimizing them for field emission applications. The flexibility of the fabrication process allows for device optimization in terms of tip geometry, density, and constituent material to achieve high field enhancement factors, exceeding 100. Miniaturized field emitting diode and gated triode devices are fabricated. Finally, the electrochemically deposited material is used as a scaffold for the deposition of a refractory, low work function emitting layer, and the hybrid cathode is characterized as a field emitter at temperatures up to 300 ºC.

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“…Therefore, they have attracted considerable attention for applications in catalysis [3][4][5]. To date, several types of ordered macroporous materials including silica [6], metals [7], metal oxides [8], polymers [9][10][11], and carbon [12] have been reported. Nevertheless, being thermodynamically unstable as well as sintering-or surface-inert, these materials are not suit-able as active catalysts for high-temperature oxidative reactions.…”

Section: Introductionmentioning

confidence: 99%

Ordered macroporous boron phosphate crystals as metal-free catalysts for the oxidative dehydrogenation of propane

Gao

Wang

et al. 2020

Chinese Journal of Catalysis

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Ordered macroporous materials with rapid mass transport and enhanced active site accessibility are essential for achieving improved catalytic activity. In this study, boron phosphate crystals with a three-dimensionally interconnected ordered macroporous structure and a robust framework were fabricated and used as stable and selective catalysts in the oxidative dehydrogenation (ODH) of propane. Due to the improved mass diffusion and higher number of exposed active sites in the ordered macroporous structure, the catalyst exhibited a remarkable olefin productivity of ~16 golefin gcat-1 h-1 , which is up to 2-100 times higher than that of ODH catalysts reported to date. The selectivity for olefins was 91.5% (propene: 82.5%, ethene: 9.0%) at 515 °C, with a propane conversion of 14.3%. At the same time, the selectivity for the unwanted deep-oxidized CO2 product remained less than 1.0%. The tri-coordinated surface boron species were identified as the active catalytic sites for the ODH of propane. This study provides a route for preparing a new type of metal-free catalyst with stable structure against oxidation and remarkable catalytic activity, which may represent a potential candidate to promote the industrialization of the ODH process.

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Pack Aluminization Assisted Enhancement of Thermo-mechanical Properties in Nickel Inverse Opal Structures

Cited by 11 publications

References 37 publications

Effect of Surface Chemistry and Roughness on the High-Temperature Deposition of a Model Asphaltene

Effect of Surface Chemistry and Roughness on the High-Temperature Deposition of a Model Asphaltene

Field Emitters Using Inverse Opal Structures

Ordered macroporous boron phosphate crystals as metal-free catalysts for the oxidative dehydrogenation of propane

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