A5014242696- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- Advanced machining processes and optimization
- Thin-Film Transistor Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced materials and composites
- Advanced Surface Polishing Techniques
- Aluminum Alloys Composites Properties
- International Maritime Law Issues
- Metallic Glasses and Amorphous Alloys
- Iron-based superconductors research
- Rare-earth and actinide compounds
- Advanced Machining and Optimization Techniques
- Intermetallics and Advanced Alloy Properties
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Silicon and Solar Cell Technologies
- Boron and Carbon Nanomaterials Research
- Superconductivity in MgB2 and Alloys
- High-Temperature Coating Behaviors
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Bone Tissue Engineering Materials
- Silicon Nanostructures and Photoluminescence
University of Connecticut
2015-2024
Inha University
2013-2024
Tulane University
2022-2023
Kangwon National University
2023
Korea Institute of Industrial Technology
2010-2022
LG (South Korea)
2003-2022
California Institute of Technology
2012-2015
Yonsei University
2015
Stanford University
2007-2012
Philips (Finland)
2005-2008
More than 32.5 million American adults suffer from osteoarthritis, and current treatments including pain medicines anti-inflammatory drugs only alleviate symptoms but do not cure the disease. Here, we have demonstrated that a biodegradable piezoelectric poly(L-lactic acid) (PLLA) nanofiber scaffold under applied force or joint load could act as battery-less electrical stimulator to promote chondrogenesis cartilage regeneration. The PLLA generated controllable charge, which promoted...
Osteoarthritis affects millions of people worldwide but current treatments using analgesics or anti-inflammatory drugs only alleviate symptoms this disease. Here, we present an injectable, biodegradable piezoelectric hydrogel, made short electrospun poly-L-lactic acid nanofibers embedded inside a collagen matrix, which can be injected into the joints and self-produce localized electrical cues under ultrasound activation to drive cartilage healing. In vitro, data shows that hydrogel with...
We report that defect-free Au nanowires show superplasticity on tensile deformation. Evidences from high-resolution electron microscopes indicated the plastic deformation proceeds layer-by-layer in an atomically coherent fashion to a long distance. Furthermore, stress-strain curve provides full interpretation of After initial superelastic deformation, nanowire shows superplastic induced by twin propagation, completely reorientating crystal <110> <100>. Uniquely well-disciplined and...
This study evaluates the quantitative biodistribution of commercially available CdSe quantum dots (QD) in mice. <b>Methods:</b><sup>64</sup>Cu-Labeled 800- or 525-nm emission wavelength QD (21- 12-nm diameter), with without 2,000 MW (molecular weight) polyethylene glycol (PEG), were injected intravenously into mice (5.55 MBq/25 pmol QD) and studied using well counting by serial microPET region-of-interest analysis. <b>Results:</b> Both methods show rapid uptake liver (27.4–38.9 %ID/g) (%ID/g...
Abstract Recent micropillar compression tests of fcc and bcc single crystals have shown that ‘Smaller is Stronger’ even in the absence significant strain gradients, an effect empirically characterised by a power-law relation. When contains dislocation network, this relation has been explained terms size-dependent operation stress weakest arm sources. This source model successfully captured for strength few micropillars, but physical interpretation not made comparing different materials. We...
To harness "smaller is more ductile" behavior emergent at nanoscale and to proliferate it onto materials with macroscale dimensions, we produced hollow-tube Cu60Zr40 metallic glass nanolattices the layer thicknesses of 120, 60, 20 nm. They exhibit unique transitions in deformation mode tube-wall thickness temperature. Molecular dynamics simulations analytical models were used interpret these terms size effects on plasticity glasses elastic instability.
A model of micro-pillar plasticity controlled by the nucleation dislocations at free surfaces was developed using methods dislocation dynamics innovated Johnston and Gilman 50 years ago. It is shown that stress dependence rate can be related to flow strength on diameter pillar. The steady state in this depends only kinetics nucleation, whereas transient deformation behavior initial density mobility, as well nucleation. describe not pillar diameter, but also recent experiments fcc gold...
Copper(I) oxide (Cu2O), which is obtained from copper(II) (CuO) through a reduction process, p-type material with band gap of 2.1-2.4 eV. However, the switching performance typical Cu2O thin-film transistors (TFTs) poor because process increases concentration oxygen vacancies (VO), interfere conduction hole carriers. Ga high affinity was doped in thin films to decrease VO during process. As result, 1.56 at % for Ga-doped (Ga:Cu2O) decreased 20.2 7.5% compared pristine films. Accordingly,...
Continuous nanolattices are an emerging class of mechanical metamaterials that highly attractive due to their superior strength-to-weight ratios, which originate from spatial architectures and nanoscale-sized elements possessing near-theoretical strength. Rational design frameworks remains challenging below 50 nm because limited methods arrange small into complex architectures. Here, we fabricate silica with ∼4- 20-nm-thick using self-assembly templating DNA origami perform in situ...
We compared genetic diversity estimated from allozymes and random amplified polymorphic DNA (RAPDs) in a sample of 210 Great Basin bristlecone pines (Pinus longaeva Bailey) three groves the White Mountains, California, USA. The Mountains are most westerly extension pine home to oldest known living trees. assayed two forks each tree determine whether they originated multiple seed caches Clark's nutcracker. Despite limited fragmented distribution pine, its level was comparable that other...
We present a set of efficient numerical algorithms to accurately compute the forces on dislocations in free-standing thin films. first spectral method for computing image stress field an isotropic elastic half space and film. The traction force free surface is decomposed into Fourier modes by discrete transform resulting obtained superimposing analytic solutions space. Dislocations intersecting surfaces are discussed, including use virtual segments associated uniqueness their solutions....