A5047138363- Fluid Dynamics and Turbulent Flows
- Particle Dynamics in Fluid Flows
- Advancements in Battery Materials
- Electrohydrodynamics and Fluid Dynamics
- Combustion and flame dynamics
- Advanced Battery Technologies Research
- Computational Fluid Dynamics and Aerodynamics
- Advanced Battery Materials and Technologies
- Fluid Dynamics and Heat Transfer
- Surface Modification and Superhydrophobicity
- Electrowetting and Microfluidic Technologies
- Wind and Air Flow Studies
- Dust and Plasma Wave Phenomena
- Granular flow and fluidized beds
- Gas Dynamics and Kinetic Theory
- Aerodynamics and Acoustics in Jet Flows
- Dental Research and COVID-19
- Plant Surface Properties and Treatments
- COVID-19 diagnosis using AI
- Power Transformer Diagnostics and Insulation
- Cyclone Separators and Fluid Dynamics
- Semiconductor materials and interfaces
- Advanced Combustion Engine Technologies
- Lattice Boltzmann Simulation Studies
- Hydrology and Sediment Transport Processes
University of Arizona
2022-2024
University of Illinois Chicago
2013-2022
Bioengineering Center
2002-2018
University of Illinois Urbana-Champaign
2005-2010
University of Hawaiʻi at Mānoa
1998-2001
Honolulu University
1999-2000
University of Hawaii System
1999
University at Buffalo, State University of New York
1993-1997
The composition, structure, and the formation mechanism of solid–electrolyte interphase (SEI) in lithium-based (e.g., Li-ion Li metal) batteries have been widely explored literature. However, very little is known about ion transport through SEI. Understanding underlying diffusion processes across SEI could lead to a significant progress, enabling performance increase improving safety aspects batteries. Herein, we report results first-principles density functional theory calculations on...
Rechargeable zinc (Zn) batteries suffer from poor cycling performance that can be attributed to dendrite growth and surface-originated side reactions. Herein, we report of Zn metal anode improved significantly by utilizing monolayer graphene (Gr) as the electrodeposition substrate. Utilizing microscopy X-ray diffraction techniques, demonstrate electrodeposited on Gr substrate has a compact, uniform, nondendritic character. The layer, due its high lattice compatibility with Zn, provides low...
In the present work, taking advantage of aberration-corrected scanning transmission electron microscopy, we show that dynamic lithiation process anode materials can be revealed in an unprecedented resolution. Atomically resolved imaging SnO2 nanowires illustrated movement, reaction, and generation b = [1[overline]1[overline]1] mixed dislocations leading lithiated stripes effectively facilitated lithium-ion insertion into crystalline interior. The geometric phase analysis density functional...
In lithium-oxygen batteries, the solubility of LiO2 intermediates in electrolyte regulates formation routes Li2O2 discharge product. High-donor-number electrolytes with a high tend to promote large particles following solution route, which eventually benefits cell capacity and cycle life. Here, we propose that facet engineering cathode catalysts could be another direction tuning Li2O2. this work, β-MnO2 crystals occupancies {111} or {100} facets were adopted as Li-O2 batteries...
Thermal runaways triggered by the oxygen release from oxide cathode materials pose a major safety concern for widespread application of lithium ion batteries. Utilizing in situ aberration-corrected scanning transmission electron microscopy (STEM) and energy loss spectroscopy (EELS) at high temperatures, we show that LixCoO2 crystals is occurring surface particles. We correlated this local evolution structure with phase transitions spanning layered to spinel then rock salt upon exposure...
Abstract Dendritic growth of lithium (Li) has severely impeded the practical application Li‐metal batteries. Herein, a 3D conformal graphene oxide nanosheet (GOn) coating, confined into woven structure glass fiber separator, is reported, which permits facile transport Li‐ions thought its structure, meanwhile regulating Li deposition. Electrochemical measurements illustrate remarkably enhanced cycle life and stability anode, explained by various microscopy modeling results. Utilizing scanning...
Abstract Despite significant interest toward solid‐state electrolytes owing to their superior safety in comparison liquid‐based electrolytes, sluggish ion diffusion and high interfacial resistance limit application durable high‐power density batteries. Here, a novel quasi‐solid Li + conductive nanocomposite polymer electrolyte containing black phosphorous (BP) nanosheets is reported. The developed successfully cycled against metal (over 550 h cycling) at 1 mA cm −2 room temperature. cycling...
Despite many theoretical predictions indicating exceptionally low energy barriers of ionic transport in phosphorene, the pathways this two-dimensional (2D) material has not been experimentally demonstrated. Here, using situ aberration-corrected transmission electron microscopy (TEM) and density functional theory, we studied sodium ion phosphorene. Our high-resolution TEM imaging complemented by loss spectroscopy demonstrates a precise description anisotropic ions migration along [100]...
Abstract Proper distribution of thermally conductive nanomaterials in polymer batteries offers new opportunities to mitigate performance degradations associated with local hot spots and safety concerns batteries. Herein, a direct ink writing (DIW) method is utilized fabricate polyethylene oxide (PEO) composite polymers electrolytes (CPE) embedded silane‐treated hexagonal boron nitride (S‐hBN) platelets free any volatile organic solvents. It observed that the S‐hBN are well aligned printed...
Despite their high energy densities, Li- and Mn-rich, layered-layered, xLi2MnO3·(1 - x)LiTMO2 (TM = Ni, Mn, Co) (LMR-NMC) cathodes require further development in order to overcome issues related bulk surface instabilities such as Mn dissolution, impedance rise, voltage fade. One promising strategy modify LMR-NMC properties has been the incorporation of spinel-type, local domains create "layered-layered-spinel" cathodes. However, precise control structure composition, well subsequent...
COVID-19, caused by the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) virus, has been rapidly spreading worldwide since December 2019, causing a public health crisis. Recent studies showed SARS-CoV-2's ability to infect humans via airborne routes. These motivated study of aerosol and droplet transmission in variety settings. This performs large-scale numerical simulation real-world dentistry clinic that contains aerosol-generating procedures. The tracks dispersion evaporating...
The temporal instability of a cylindrical capillary jet is analysed numerically for different liquid Reynolds numbers Re , disturbance wavenumbers k and amplitudes ε 0 . breakup mechanism viscous jets the formation satellite drops are described. results show that size decreases with decreasing increasing Marginal below which no formed obtained large range wavenumbers. growth rates disturbances calculated compared those from linear theory. These match low- jets, however as increased theory...
With the increased need for high-rate Li-ion batteries, it has become apparent that new electrode materials with enhanced transport should be designed. Interfaces, such as twin boundaries (TBs), offer opportunities to navigate ionic within nanoscale materials. Here, we demonstrate effects of TBs on properties in single crystalline SnO2 nanowires. It is shown TB-assisted lithiation pathways are remarkably different from previously reported behavior nanowires without TBs. Our situ transmission...
The progress on sodium‐ion battery technology faces many grand challenges, one of which is the considerably lower rate sodium insertion/deinsertion in electrode materials due to larger size (Na) ions and complicated redox reactions compared lithium‐ion systems. Here, it demonstrated that can be reversibly stored Zn‐Sb intermetallic nanowires at speeds exceed 295 nm s −1 . Remarkably, these values are three orders magnitude higher than sodiation other electrochemically tested with situ...
In this paper, we report the first direct chemical and imaging evidence of lithium-induced atomic ordering in amorphous TiO2 nanomaterials propose new reaction mechanisms that contradict many works published literature on lithiation behavior these materials. The process was conducted situ inside an resolution transmission electron microscope. Our results indicate started with valence reduction Ti4+ to Ti3+ leading a LixTiO2 intercalation compound. continued Li ions nanotubes triggered...
While theoretical simulations predict contradictory results about how the intercalation of foreign metal atoms affects order atomic layers in black phosphorus (BP), no direct experimental visualization work has yet clarified this ambiguity. By situ electrochemical sodiation BP inside a high-resolution transmission electron microscope and first-principles calculations, we found that sodium induces relative glide 1/2 ⟨010⟩ {001}, resulting reordering stacks from AB to AC BP. The observed local...
The aerosol transmissibility of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has impacted the delivery health care and essentially stopped provision medical dental therapies. Dentistry uses rotary, ultrasonic, laser-based instruments that produce water-based aerosols in daily, routine treatment patients. Abundant are generated, which reach workers other Viruses, including SARS-CoV-2 virus related disease (COVID-19) pandemic, continued expansion throughout USA world. is spread...