A5101972927- Advancements in Battery Materials
- Graphene research and applications
- Advanced Battery Materials and Technologies
- Carbon Nanotubes in Composites
- Semiconductor materials and interfaces
- Cellular Mechanics and Interactions
- Semiconductor materials and devices
- Lipid Membrane Structure and Behavior
- Force Microscopy Techniques and Applications
- Advanced Battery Technologies Research
- Nanopore and Nanochannel Transport Studies
- Supercapacitor Materials and Fabrication
- 3D Printing in Biomedical Research
- Advanced Sensor and Energy Harvesting Materials
- Micro and Nano Robotics
- Nanoparticle-Based Drug Delivery
- Dielectric materials and actuators
- Boron and Carbon Nanomaterials Research
- Diamond and Carbon-based Materials Research
- Blood properties and coagulation
- Ion-surface interactions and analysis
- Innovative Energy Harvesting Technologies
- 2D Materials and Applications
- Advanced Cellulose Research Studies
- Polysaccharides Composition and Applications
Pennsylvania State University
2015-2024
China Automotive Technology and Research Center
2021-2022
Park University
2014-2019
Fudan University
2018
Georgia Institute of Technology
2014
South China University of Technology
2014
Tianjin University
2013
University of Arkansas at Fayetteville
2006-2008
Northwestern University
2003-2007
University of Illinois Urbana-Champaign
2002-2003
The cellular uptake of nanoparticles by living cells is predicted to be strongly size-dependent, according the thermodynamic analysis, and an optimal particle radius ∼ 25–30 nm at which reaches a maximum several thousand shown exist. theoretical prediction provides valuable guidance for rational design nanoparticle-based drug-delivery systems.
We report direct observation of an unexpected anisotropic swelling Si nanowires during lithiation against either a solid electrolyte with lithium counter-electrode or liquid LiCoO2 counter-electrode. Such expansion is attributed to the interfacial processes accommodating large volumetric strains at reaction front that depend sensitively on crystallographic orientation. This results in lithiated remarkable dumbbell-shaped cross section, which develops due plastic flow and ensuing necking...
Abstract Understanding the microscopic mechanisms of electrochemical reaction and material degradation is crucial for rational design high‐performance lithium ion batteries (LIBs). A novel nanobattery assembly testing platform inside a transmission electron microscope (TEM) has been designed, which allows direct study structural evolution individual nanowire or nanoparticle electrodes with near‐atomic resolution in real time. In this review, recent progresses several important anode...
Coupled quantum mechanical/molecular mechanical (QM/MM) calculations were used to study the effects of large defects and cracks on properties carbon nanotubes graphene sheets. The semi-empirical method PM3 was treat QM subdomains a Tersoff-Brenner potential for molecular mechanics; some also done using density functional theory (DFT). Scaling so that modulus overall stress-strain behavior MM models matched quite closely essential obtaining meaningful coupled properties. numerical results...
Polymer composites with electrically conductive fillers have been developed as mechanically flexible, easily processable electromagnetic interference (EMI) shielding materials. Although there are a few elastomeric nanostructured silvers and carbon nanotubes showing moderate stretchability, their EMI effectiveness (SE) deteriorates consistently stretching. Here, highly stretchable polymer composite embedded three-dimensional (3D) liquid-metal (LM) network exhibiting substantial increases of...
Electrochemically driven functioning of a battery inevitably induces thermal and mechanical effects, which in turn couple with the electrochemical effect collectively govern performance battery. However, such coupling effect, whether favorable or detrimental, has never been explicitly elucidated. Here we use situ transmission electron microscopy to demonstrate effect. We discover that thermally perturbating delithiated LiNi0.6Mn0.2Co0.2O2 will trigger explosive nucleation propagation...
Abstract Silicon has been identified as a highly promising anode for next-generation lithium-ion batteries (LIBs). The key challenge Si anodes is large volume change during the lithiation/delithiation cycle that results in chemomechanical degradation and subsequent rapid capacity fading. Here we report novel fabrication method hierarchically porous nanospheres (hp-SiNSs), which consist of shell hollow core. On charge/discharge cycling, hp-SiNSs accommodate through reversible inward Li...
Nanoparticles (NPs) hold great promises for targeted disease diagnosis and therapy. Despite considerable progress in biomimetic design of NP-bioconjugates, the roles NP size shape endocytosis are still not fully understood. Using an efficient coarse-grained molecular dynamics (CGMD) model, we simulate receptor-mediated NPs various sizes shapes. Our simulations demonstrate that both modulate kinetics endocytosis. For spherical NPs, there exists optimal at which takes shortest time. a...
The rates of charging and discharging in lithium-ion batteries (LIBs) are critically controlled by the kinetics Li insertion extraction solid-state electrodes. Silicon is being intensively studied as a high-capacity anode material for LIBs. However, reaction diffusion Si remain unclear. Here we report combined experimental theoretical study lithiation individual nanowires. By using situ transmission electron microscopy, measure rate growth surface layer amorphous Li(x)Si crystalline...
Recent independent experiments demonstrated that the lithiation-induced volume expansion in silicon nanowires, nanopillars, and microslabs is highly anisotropic, with predominant along ⟨110⟩ direction but negligibly small ⟨111⟩ direction. The origin of such anisotropic behavior remains elusive. Here, we develop a chemomechanical model to study phase evolution morphological changes lithiated nanowires. couples diffusive reaction lithium elasto-plastic deformation. We show apparent swelling...
Exceptionally high piezoelectric and pyroelectric performances have been demonstrated in the three-dimensional interconnected microfoam based polymer nanocomposites.
Plants have evolved complex nanofibril-based cell walls to meet diverse biological and physical constraints. How strength extensibility emerge from the nanoscale-to-mesoscale organization of growing has long been unresolved. We sought clarify mechanical roles cellulose matrix polysaccharides by developing a coarse-grained model based on polymer physics that recapitulates aspects assembly tensile mechanics epidermal walls. Simple noncovalent binding interactions in generate bundled networks...
An individual carbon nanocoil was clamped between two AFM cantilevers and loaded in tension to a maximum relative elongation of ∼42%. The deformation the agrees well with an analytical model spring constant that accounts for geometric nonlinearity. behaves like elastic K 0.12 N/m low strain region. No plastic detected. High-resolution microscopy images electron energy loss spectrum (EELS) indicate nanocoils are amorphous sp2/sp3 bonded-carbon ratio ∼4:1.
Molecular mechanics (MM) calculations together with coupling methods bridging MM and finite crystal elasticity are employed to simulate the fracture of defected carbon nanotubes (CNTs) compare available experimental results. The modified second generation Brenner potential (MTB-G2) is adopted in calculations. Our show fair agreement quantum mechanical (QM) benchmarks, indicate that one- two-atom vacancies reduce strength CNTs by $20%--33%$ (whereas QM predict $14%--27%$), but these strengths...
Mechanical degradation of the electrode materials during electrochemical cycling remains a serious issue that critically limits capacity retention and cyclability rechargeable lithium-ion batteries. Here we report highly reversible expansion contraction germanium nanoparticles under lithiation-delithiation with in situ transmission electron microscopy (TEM). During multiple cycles to full capacity, remained robust without any visible cracking despite ∼260% volume changes, contrast...
In receptor-mediated endocytosis, cells exercise biochemical control over the mechanics of adhesion to engulf foreign particles, featuring a variable strength. Here we present thermodynamic model with which elucidate that strength critically governs cellular uptake, yielding an uptake phase diagram in space ligand density and particle size. We identify from endocytosed markedly high encompassed by lower upper boundary are set, respectively, enthalpic entropic limits The may provide useful...
Abstract Efficient mechanical energy harvesters enable various wearable devices and auxiliary supply. Here we report a novel class of via stress–voltage coupling in electrochemically alloyed electrodes. The device consists two identical Li-alloyed Si as electrodes, separated by electrolyte-soaked polymer membranes. Bending-induced asymmetric stresses generate chemical potential difference, driving lithium ion flux from the compressed to tensed electrode electrical current. Removing bending...
Two-dimensional layers of molybdenum disulfide, MoS2, have been recognized as promising materials for nanoelectronics due to their exceptional electronic and optical properties. Here we develop a new ReaxFF reactive potential that can accurately describe the thermodynamic structural properties MoS2 sheets, guided by extensive density functional theory simulations. This is then applied formation energies five different types vacancies, various vacancy migration barriers, transition barrier...