Search results for: Nina Orlovskaya

Items from 1 to 20 out of 49 results

article

Dual‐Doping and Synergism toward High‐Performance Seawater Electrolysis

Jinfa Chang, Guanzhi Wang, Zhenzhong Yang, Boyang Li, more

Advanced Materials > 33 > 33 > n/a - n/a

Hydrogen (H₂) production from direct seawater electrolysis is an economically appealing yet fundamentally and technically challenging approach to harvest clean energy. The current seawater electrolysis technology is significantly hindered by the poor stability and low selectivity of the oxygen evolution reaction (OER) due to the competition with chlorine evolution reaction in practical application...

article

LaCoO3 catalytically enhanced MgO partially stabilized ZrO2 in heterogeneous methane combustion

Anthony C. Terracciano, Samuel T. De Oliveira, Subith S. Vasu, Nina Orlovskaya

Experimental Thermal and Fluid Science > 2018 > 90 > C > 330-335

Heterogeneous combustion is an advanced combustion technique in which a porous ceramic support is immersed into a combustion chamber to provide heat redistribution through the chemical reaction wave. Within this work a support made of magnesia partially stabilized zirconia (MgO-ZrO₂), a fast O^2- ionic conductor, is used to evaluate gadolinia doped ceria (Ce_0.8Gd_0.2O_1.9), and lanthanum cobaltite (LaCoO...

article

Effect of catalytically active Ce0.8Gd0.2O1.9 coating on the heterogeneous combustion of methane within MgO stabilized ZrO2 porous ceramics

Anthony C. Terracciano, Samuel De Oliveira, Demetrius Vazquez-Molina, Fernando J. Uribe-Romo, more

Combustion and Flame > 2017 > 180 > C > 32-39

Within this work, a MgO stabilized ZrO₂ (MSZ) porous media with and without a gadolinia doped ceria (Ce_0.8Gd_0.2O_1.9, GDC) catalyst coating has been evaluated in heterogeneous combustion of mixtures of methane and air at different equivalence ratios inside of a porous combustor. The temperature distribution within the combustion chamber along with optical and acoustic emissions profiles from the exhaust...

article

Flow stabilized porous heterogeneous combustor. Part II: Operational parameters and the acoustic emission

Anthony Carmine Terracciano, Samuel De Oliveira, Subith S. Vasu, Nina Orlovskaya

Fuel Processing Technology > 2017 > 159 > C > 412-420

Heterogeneous combustion is an advanced combustion technique, which incorporates a highly porous ceramic media into the combustion chamber, and enables the flame to propagate within the pores of the ceramic media. Heat exchange between the solid and gas phases within the combustion chamber can enable a flame to exist that is highly resilient to momentary disruptions in reactant flow rates while also...

article

Flow stabilized porous heterogeneous combustor. Part I: Design and development

Anthony Carmine Terracciano, Samuel De Oliveira, Manuel Robayo, Subith S. Vasu, more

Fuel Processing Technology > 2017 > 159 > C > 353-362

A heterogeneous combustor was developed where the flame position within the ceramic porous media, contained within the combustor, could be controlled using the reactant flow rate. The porous media within the combustor can be coated with a catalyst to further promote combustion; this apparatus was designed to enable the investigation of various catalysts to be evaluated for their effectiveness as promoters...

article

Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites

Amjad Aman, Ryan Jordan, Yan Chen, Richard Stadelmann, more

Journal of the European Ceramic Society > 2017 > 37 > 4 > 1563-1576

This paper presents the mechanical behavior of LaCoO₃ and La_0.8Ca_0.2CoO₃ ceramics under four-point bending in which the two cobaltites are subjected to a low stress of ∼8MPa at temperatures ranging from room temperature to 1000°C. Unexpected stiffening is observed in pure LaCoO₃ in the 700–900°C temperature range, leading to a significant increase in the measured Young’s modulus, whereas La_0.8Ca_0.2...

article

Pd enhanced WC catalyst to promote heterogeneous methane combustion

Anthony Carmine Terracciano, Samuel De Oliveira, Deepti Siddhanti, Richard Blair, more

Applied Thermal Engineering > 2017 > 114 > C > 663-672

The efficiency of combustion for low cost heat production could be greatly enhanced if an active and low cost catalyst would be used to facilitate the chemical reactions occurring during combustor operation. Within this work an experimental study of palladium (Pd) enhanced tungsten carbide (WC) catalyst, synthesized via high energy ball milling and deposited by dip coating onto a magnesia partially...

article

Thermal expansion and elastic moduli of electrolyte materials for high and intermediate temperature solid oxide fuel cell

Peipei Gao, Amy Bolon, Manisha Taneja, Zhilin Xie, more

Solid State Ionics > 2017 > 300 > C > 1-9

The development of thermal stresses in solid oxide fuel cells (SOFCs), and thus their structural stability and reliability, depends directly on the thermal expansion and elastic moduli of the constituent materials. Therefore, it is important to study these properties of SOFC materials. In this study, the thermal expansion and elastic properties of common electrolyte materials, namely yttria stabilized...

article

Oxygen Interaction with Hexagonal OsB₂ at High Temperature

Zhilin Xie, Richard G. Blair, Nina Orlovskaya, David A. Cullen, more

Journal of the American Ceramic Society > 99 > 12 > 4057 - 4065

The stability of ReB₂‐type hexagonal OsB₂ powder at high temperature with oxygen presence has been studied by thermogravimetric analysis, differential scanning calorimetry, SEM, EDS, and high‐temperature scanning transmission electron microscopy and XRD. Results of the study revealed that OsB₂ ceramics interact readily with oxygen present in reducing atmosphere, especially at high temperature and...

article

Design and development of a porous heterogeneous combustor for efficient heat production by combustion of liquid and gaseous fuels

Anthony Carmine Terracciano, Subith S. Vasu, Nina Orlovskaya

Applied Energy > 2016 > 179 > C > 228-236

This work focuses on the design and operation of a heterogeneous combustor capable of operating on both gaseous and liquid fuels, featuring a highly porous (up to 90% porosity) silicon carbide ceramic media within the combustion chamber where the combustion reactions take place. Four interlinked devices – a heat exchanger, a vaporization chamber where liquid fuel may be injected, a mixing chamber,...

chapter

Boron Carbide/Boron Carbide-Carbon Nanofibers Laminates with Weak Interfaces

Nina Orlovskaya, Mykola Lugovy, Viktor Slyunyayev, Vladimir Subbotin, more

NATO Science for Peace and Security Series B: Physics and Biophysics > Boron Rich Solids > 1-11

Three layered B₄C/B₄C-C_nanofibers laminates have been produced using a hot pressing technique. The laminates were designed with thick (~2.6 mm) outer layers of B₄C and a thin (~90 µm) center layer of B₄C-70 wt% C_nanofibers. It was found that low tensile thermal residual stress develops in the thick B₄C outer layers. The compressive thermal residual stresses exist in the thin central layer. The magnitude...

chapter

LaFeO₃ and LaCoO₃ Based Perovskites: Preparation and Properties of Dense Oxygen Permeable Membranes

Kjell Wiik, Anita Fossdal, Lise Sagdahl, Hilde L. Lein, more

NATO Science Series II: Mathematics, Physics and Chemistry > Mixed Ionic Electronic Conducting Perovskites for Advanced Energy Systems > 75-85

LaCoO₃ and LaFeO₃ based perovskites have been studied as model materials for oxygen permeable membranes. To avoid gas leakages it is of crucial importance to obtain dense membranes, hence the densification behavior in terms of temperature, stoichiometry (AB-ratio), presence of secondary phases and substituents (Ca and Sr) have been investigated. Only a narrow temperature window for the sintering is...

book

Boron Rich Solids

Nina Orlovskaya, Mykola Lugovy

NATO Science for Peace and Security Series B: Physics and Biophysics

The objective of this book is to discuss the current status of research and development of boron-rich solids as sensors, ultra-high temperature ceramics, thermoelectrics, and armor. Novel biological and chemical sensors made of stiff and light-weight boron-rich solids are very exciting and efficient for applications in medical diagnoses, environmental surveillance and the detection of pathogen and...

book

Mixed Ionic Electronic Conducting Perovskites for Advanced Energy Systems

Nina Orlovskaya, Nigel Browning

NATO Science Series II: Mathematics, Physics and Chemistry

Advanced mixed ionic electronic conducting (MIEC) perovskites play an important role in many electrochemical systems for advanced energy technologies. They are major components in such devices as solid oxide fuel cells (SOFCs), oxygen separation membranes, chemical sensors and catalysts. In addition to energy technology, the development of these multifunctional materials is of crucial importance...

article

In search of the elusive IrB2: Can mechanochemistry help?

Zhilin Xie, Richard G. Blair, Nina Orlovskaya, David A. Cullen, more

Journal of Solid State Chemistry > 2016 > 233 > C > 108-119

The previously unknown hexagonal ReB₂-type IrB₂ diboride and orthorhombic IrB monoboride phases were produced by mechanochemical syntheses. High energy ball milling of elemental Ir and B powder for 30h, followed by annealing of the powder at 1050°C for 48h, resulted in the formation of the desired phases. Both traditional laboratory and high resolution synchrotron X-ray diffraction (XRD) analyses...

article

Hexagonal OsB2: Sintering, microstructure and mechanical properties

Zhilin Xie, Mykola Lugovy, Nina Orlovskaya, Thomas Graule, more

Journal of Alloys and Compounds > 2015 > 634 > C > 168-178

The metastable high pressure ReB₂-type hexagonal OsB₂ bulk ceramics was produced by spark plasma sintering. The phase composition, microstructure, and mechanical behavior of the sintered OsB₂ were studied by X-ray diffraction, optical microscopy, TEM, SEM, EDS, and nanoindentation. The produced ceramics was rather porous and contained a mixture of hexagonal (∼80wt.%) and orthorhombic (∼20wt.%) phases...

article

A search for temperature induced time-dependent structural transitions in 10mol%Sc2O3–1mol%CeO2–ZrO2 and 8mol%Y2O3–ZrO2 electrolyte ceramics

Yan Chen, Nina Orlovskaya, E. Andrew Payzant, Thomas Graule, more

Journal of the European Ceramic Society > 2015 > 35 > 3 > 951-958

Both Sc₂O₃–CeO₂-stabilized-ZrO₂ (SCSZ) and Y₂O₃-stabilized-ZrO₂ (YSZ) show similar Young's modulus damping at 175–400°C and 200–400°C, respectively, by impulse excitation acoustic technique. The phase transition in SCSZ is considered responsible for the damping; however for YSZ, such a phase transition has never been reported. To clarify the relation of damping and structural transition in these two...

article

Thermal stability of hexagonal OsB2

Zhilin Xie, Richard G. Blair, Nina Orlovskaya, David A. Cullen, more

Journal of Solid State Chemistry > 2014 > 219 > C > 210-219

The synthesis of novel hexagonal ReB₂-type OsB₂ ceramic powder was performed by high energy ball milling of elemental Os and B powders. Two different sources of B powder have been used for this mechanochemical synthesis. One B powder consisted of a mixture of amorphous and crystalline phases and a mixture of ¹⁰B and ¹¹B isotopes with a fine particle size, while another B powder was a purely crystalline...

article

Perovskite catalysts enhanced combustion on porous media

Manuel D. Robayo, Ben Beaman, Billy Hughes, Brittany Delose, more

Energy > 2014 > 76 > C > 477-486

The effects of La–Sr–Fe–Cr–Ru based perovskite catalysts, on matrix stabilized combustion in a porous ceramic media are explored. Highly porous silicon carbide ceramics are used as a porous media for a catalytically enhanced superadiabatic combustion of a lean mixture of methane and air. The direct observation of the flame during the combustion becomes possible due to a specially designed stainless...

article

Novel high pressure hexagonal OsB2 by mechanochemistry

Zhilin Xie, Moritz Graule, Nina Orlovskaya, E. Andrew Payzant, more

Journal of Solid State Chemistry > 2014 > 215 > Complete > 16-21

Hexagonal OsB ₂ , a theoretically predicted high-pressure phase, has been synthesized for the first time by a mechanochemical method, i.e., high energy ball milling. X-ray diffraction indicated that formation of hexagonal OsB ₂ begins after 2.5h of milling, and the reaction reaches equilibrium after 18h of milling. Rietveld refinement of the powder data indicated that hexagonal OsB...

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INFONA - science communication portal

Search results for: Nina Orlovskaya

Dual‐Doping and Synergism toward High‐Performance Seawater Electrolysis

LaCoO3 catalytically enhanced MgO partially stabilized ZrO2 in heterogeneous methane combustion

Effect of catalytically active Ce0.8Gd0.2O1.9 coating on the heterogeneous combustion of methane within MgO stabilized ZrO2 porous ceramics

Flow stabilized porous heterogeneous combustor. Part II: Operational parameters and the acoustic emission

Flow stabilized porous heterogeneous combustor. Part I: Design and development

Non-congruence of high-temperature mechanical and structural behaviors of LaCoO3 based perovskites

Pd enhanced WC catalyst to promote heterogeneous methane combustion

Thermal expansion and elastic moduli of electrolyte materials for high and intermediate temperature solid oxide fuel cell

Oxygen Interaction with Hexagonal OsB₂ at High Temperature

Design and development of a porous heterogeneous combustor for efficient heat production by combustion of liquid and gaseous fuels

Boron Carbide/Boron Carbide-Carbon Nanofibers Laminates with Weak Interfaces

LaFeO₃ and LaCoO₃ Based Perovskites: Preparation and Properties of Dense Oxygen Permeable Membranes

Boron Rich Solids

Mixed Ionic Electronic Conducting Perovskites for Advanced Energy Systems

In search of the elusive IrB2: Can mechanochemistry help?

Hexagonal OsB2: Sintering, microstructure and mechanical properties

A search for temperature induced time-dependent structural transitions in 10mol%Sc2O3–1mol%CeO2–ZrO2 and 8mol%Y2O3–ZrO2 electrolyte ceramics

Thermal stability of hexagonal OsB2

Perovskite catalysts enhanced combustion on porous media

Novel high pressure hexagonal OsB2 by mechanochemistry

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