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Search Publications

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Displaying 51 - 75 of 564

Dynamic structural and microstructural responses of a metal organic framework type material to carbon dioxide under dual gas flow and supercritical conditions

February 1, 2023
Author(s)
Andrew J. Allen, Eric J. Cockayne, Winnie Wong-Ng, Jeffrey Culp, Ivan Kuzmenko
The structural and microstructural responses of a model metal-organic framework (MOF) material, Ni(3-Methy-4,4'-bipyridine)[Ni(CN)4] (Ni-BpyMe or PICNIC 21), to CO2 adsorption and desorption are reported for in situ small-angle X-ray scattering (SAXS) and

Entering New Era of Thermoelectric Oxide Ceramics with High Power Factor through Designing Grain Boundaries

January 12, 2023
Author(s)
Cesar-Octavio Romo-De-La-Cruz, Yun Chen, Liang Liang, Sergio Paredes-Navia, Winnie Wong-Ng, Mark Williams, Xueyan Song
Thermoelectric (TE) oxide ceramics could play a significant role in waste heat recovery using TE generators, accelerating clean energy generation and achieving net-zero emissions. In 2003, the TE performance of single-crystal Ca3Co4O9+δ was evaluated with

Validation of and Optimization with a Vapor Compression Cycle Model Accounting for Refrigerant Thermodynamic and Transport Properties: With Focus on Low GWP Refrigerants for Air-Conditioning

November 26, 2022
Author(s)
Harrison M. Skye, Piotr A. Domanski, Riccardo Brignoli, SANGHUN LEE, Heunghee Bae
CYCLE_D-HX is a semi-theoretical model that simulates the performance of a vapor-compression cycle with forced-convection heat exchangers for specified temperature profiles of the heat source and heat sink. In this study, we validated CYCLE_D-HX using

Hyperspectral Imaging of Localized, Optically-Active Defects in GaAs Solar Cells

November 14, 2022
Author(s)
Behrang Hamadani, Margaret Stevens, Brianna Conrad, Matthew Lumb, Eric Armour, Kenneth Schmieder
A novel hyperspectral imaging instrument with dual electroluminescence and photoluminescence capability was used to image and analyze localized radiative defects in rear-junction GaAs solar cells grown at 1 µm/min. The absolute photon emission rates were

High-Throughput Nanopore Fabrication and Classification Using Xe-Ion Irradiation and Automated Pore-Edge Analysis

September 26, 2022
Author(s)
Michal Macha, Sanjin Marion, Mukesh Tripathi, Martina Lihter, Alex Smolyanitsky, Andras Kis, Aleksandra Radenovic
Large-area nanopore drilling is a major bottleneck in state-of-the-art nanoporous 2D membrane fabrication protocols. In addition, high-quality structural and statistical descriptions of as-fabricated porous membranes are key to predicting the corresponding

Structural and electronic properties of Cu3InSe4

September 11, 2022
Author(s)
Oluwagbemiga Ojo, Winnie Wong-Ng, Teiyan Chang, Yu-Sheng Chen, George S. Nolas
Single crystals of the previously unascertained ternary chalcogenide Cu3InSe4 were obtained by induction melting, allowing for a complete investigation of the crystal structure by employing high-resolution single-crystal synchrotron X-ray diffraction

Energy Broadening of Neutron Depth Profiles by Thin Polyamide Films

September 7, 2022
Author(s)
Jamie Weaver, Anna Job, Kedar Manandhar, Ichiro Takeuchi, Robert Gregory Downing
A protective covering is often required for neutron depth profiling (NDP) measurements of sensitive materials (e.g., Li-ion batteries). Addition of this layer can increase NDP profile energy broadening and depth assignment uncertainty. This study evaluates

Visualizing Localized, Radiative Defects in GaAs Solar Cells

September 1, 2022
Author(s)
Behrang Hamadani, Margaret Stevens, Brianna Conrad, Matthew Lumb, Kenneth Schmieder
We have used a calibrated, wide-field hyperspectral imaging instrument to obtain absolute spectrally and spatially resolved photoluminescence images in high growth-rate, rear-junction GaAs solar cells from 300 K to 77 K. At the site of some localized

Atomically Dispersed CuNx Sites from Thermal Activation of Boron Imidazolate Cages for Electrocatalytic Methane Generation

August 12, 2022
Author(s)
Soumyodip Banerjee, Justin Gorham, Maxime Siegler, Natalia Drichko, Joshua Wright, Nicholas Bedford, Sara Thoi
Atomically dispersed heteroatom coordinated metal sites (ADMS) have been recognized as promising candidates for electrochemical conversion. Among a diverse range of molecular precursors for ADMS synthesis, framework materials are particularly interesting

Equations of State for n-Hexadecane and n-Docosane

August 5, 2022
Author(s)
Raffaela Romeo, Eric W. Lemmon
Equations of state for n-hexadecane (C16H34) and n-docosane (C22H46) have been developed as functions of the Helmholtz energy with independent variables of temperature and density. The equations were developed based on experimental values of density, speed

Microstructure changes during failure of PVDF-based photovoltaic backsheets

July 21, 2022
Author(s)
Stephanie Moffitt, Po-Chang Pan, Lakesha Perry, Michael Kempe, Jared Tracy, Kaushik Choudhury, Xiaohong Gu
The backsheet layer of a solar module provides a safety and environmental barrier to the high voltages running through the photovoltaic (PV) cells and electrical contacts within the core of the module. However, in the past decade, backsheet cracking has

Unraveling the Stable Cathode Electrolyte Interface in all Solid-State Thin-Film Battery Operating at 5 V

July 4, 2022
Author(s)
Ryosuke Shimizu, Diyi Cheng, Jamie Weaver, Minghao Zhang, Bingyu Lu, Thomas Wynn, Randall Burger, Min-cheol Kim, Guomin Zhu, Ying Shirley Meng
Spinel-type LiNi0.5Mn1.5O4 (LNMO) is one of the most promising 5 V-class cathode materials for Li-ion batteries that can achieve high energy density and low production costs. However, in liquid electrolyte cells, the high voltage causes continuous cell

Thermal and mechanical properties of clathrate-II Na24Si136

June 30, 2022
Author(s)
Matthew Beekman, Antti Karttunen, Winnie Wong-Ng, Mingjian Zhang, Yu-Sheng Chen, Christian Posadas, Andrew Jarymowycz, Ethan Cruise, Wanyue Peng, Alexandra Zevalkink, James A. Kaduk, George S. Nolas
Thermal expansion, lattice dynamics, heat capacity, compressibility, and pressure stability of the intermetallic clathrate Na24Si136 have been investigated by a combination of first principles calculations and experiment. Direct comparison of the
Displaying 51 - 75 of 564