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2017-03-16

Ujwal K Thakur; Abdelrahman M. Askar; Ryan Kisslinger; Benjamin D. Wiltshire; Piyush Kar; Karthik Shankar

This is the first report of a 17.6 % champion efficiency solar cell architecture comprising monocrystalline TiO2 nanorods (TNRs) coupled with perovskite, and formed using facile solution processing without non-routine surface conditioning. Vertically oriented TNR ensembles are desirable as...

2018-07-22

Kar, Piyush;, Zeng, Sheng;, Zhang, Yun; Vahidzadeh, Ehsan;, Manuel, Ajay P.;, Kisslinger, Ryan;, Alam, Kazi M,;, Thakur, Ujwal K.,, Mahdi, Najia;, Kumar, Pawan;, Shankar, Karthik

The photocatalytic reduction of CO2 into light hydrocarbons using sunlight and water is a challenging reaction involving eight electron transfer steps; nevertheless, it has great potential to address the problem of rising anthropogenic carbon emissions and enable the use of fossil fuels in a...

2018-01-01

Bhagavathula, Kapil Bharadwaj, Azar, Austin, Ouellet, Simon, Satapathy, Sikhanda, Dennison, Christopher R., Hogan, James D.

Polymeric foams are an essential part of personal protection equipment, such as helmets and body armor. In this work, the authors study the strain-rate dependent behavior of a dilatant polymeric foam, focusing on developing characterization and testing methodologies needed to better understand...

2021-06-01

Shao, Chenwei, Lo, Calvin, Bhagavathula, Kapil, McDonald, André, Hogan, James D.

Aluminum-alumina (Al–Al2O3) composites with ultrahigh strength were designed by combining dispersion strengthening via the addition of Al2O3 particles and matrix strengthening via in situ strain hardening. Cold spraying additive manufacturing technology was applied to fabricate the composites....

2017-05-04

Ha, M and Michaelis, V.K.

Dynamic nuclear polarization (DNP) NMR spectroscopy, a high-polarization method, is rapidly changing the landscape of what is possible in solid-state nuclear magnetic resonance spectroscopy. To date, there have been over 200 publications discussing high-frequency DNP NMR of solids with more than...

2017-01-01

Ha, M. and Michaelis, V.K.

High-frequency dynamic nuclear polarization nuclear magnetic resonance (DNP NMR) spectroscopy is having a major impact on the far-reaching abilities of solid-state NMR. This high-sensitivity technique made possible by transferring high polarization from an unpaired electron source to an...

2023-01-01

Mao, Kyle, Toussaint, Geneviève, Komrakova, Alexandra, Hogan, James D.

As an advanced fracture model, the Generalized Incremental Stress State dependent damage MOdel (GISSMO) provides non-linear damage accumulation formulation to better predict ductile fracture initiation associated with a wider range of material stress states. In this study, we simulate the...

2023-04-01

Yang, Alex, Romanyk, Dan, Hogan, James D.

A numerical approach combining finite element modeling and machine learning is used to inform the material performance of an alumina ceramic tile undergoing high-velocity impact. In this study, the alumina ceramic tile is simulated by incorporating a user-defined Johnson–Holmquist–Beissel (JHB)...

2015-01-01

Qihua Huang, Mark A. Lewis

Short-term and long-term population growth rates can differ considerably. While changes in growth rates can be driven by external factors, we consider another source for changes in growth rate. That is, changes are generated internally by gradual modification of population structure. Such...

2020-10-27

Li, Qing, Gänzle, Michael G.

Back-slopping of fermentation cultures in food fermentations can ensure stability of fermentation microbiota at the species or even at the strain level over extended periods of time. In contrast to the fermentation organisms in spontaneous food fermentations, which are derived from...