A5056086369- Metal and Thin Film Mechanics
- Additive Manufacturing and 3D Printing Technologies
- Additive Manufacturing Materials and Processes
- Microstructure and mechanical properties
- Electronic Packaging and Soldering Technologies
- High Entropy Alloys Studies
- Nonlocal and gradient elasticity in micro/nano structures
- Boron and Carbon Nanomaterials Research
- Advanced Sensor and Energy Harvesting Materials
- Advanced ceramic materials synthesis
- Adhesion, Friction, and Surface Interactions
- MXene and MAX Phase Materials
- Composite Structure Analysis and Optimization
- Aluminum Alloys Composites Properties
- Nanomaterials and Printing Technologies
- Shape Memory Alloy Transformations
- Force Microscopy Techniques and Applications
- Advanced materials and composites
- Copper Interconnects and Reliability
- Advanced Measurement and Metrology Techniques
- Intermetallics and Advanced Alloy Properties
- Semiconductor materials and interfaces
- Mechanical Behavior of Composites
- Magnesium Alloys: Properties and Applications
- Ferroelectric and Piezoelectric Materials
Korea Advanced Institute of Science and Technology
2012-2025
Johns Hopkins University
2016-2021
Harvard University
2011-2019
Seoul National University
2013
The theoretical strength of a material is the minimum stress to deform or fracture perfect single crystal that has no defects. This considered as an upper bound on attainable for real crystal. In contradiction this expectation, we use quantum mechanics (QM) simulations show boron carbide (B4C) hard ceramic, shear can be exceeded by 11% imposing nanoscale twins. We also predict from QM indentation nanotwinned B4C 12% higher than Further, validate effect experimentally, showing samples are...
Higher-order deformation theories, such as the couple stress and strain gradient theory, have been widely used to predict mechanical behavior of micro/nano-scale structures. In this paper, additional length scale parameter introduced in theory is measured by performing bulk-scale tensile micro-scale cantilever bending experiments. Bulk-scale characterization provided microstructural information polycrystalline copper plate along with macroscopic properties. Micro-scale cantilevers...
Metal nanoparticle solutions are widely used for the fabrication of printed electronic devices. The mechanical properties solution-processed metal thin films very important robust and reliable operation In this paper, we report tensile characteristics silver (Ag NP) on flexible polymer substrates by observing microstructures measuring electrical resistance under strain. effects annealing temperatures periods Ag NP their failure strains explained with a microstructural investigation. maximum...
We demonstrate a route to synthesize ultra-high-temperature ceramic coatings of ZrB2 at temperatures below 1300 K using Zr/B reactive multilayers. Highly textured crystalline is formed modest because the absence any oxide interface between Zr and B very short diffusion distance that inherent multilayer geometry. The kinetics formation reaction analyzed high-temperature scanning nanocalorimetry, microstructural evolution revealed transmission electron microscopy. show proceeds in two stages:...
In this paper, we report that silver films evaporated on poly-ethylene-terephthalate (PET) substrates coated with an acrylic primer can be stretched beyond 70% without fracture. As-deposited show a larger failure strain than annealed coatings. These observations are rationalized in light of ductile fracture mechanism where debonding from the substrate coevolves localization. The results study indicate PET layer may suitable for stretchable electronics.
Flexible electronics using nanoparticle (NP) printing has been highlighted as a key technology enabling eco-friendly, low-cost, and large-area fabrication. For NP-based to be used successive alternative photolithography vacuum deposition, stretchability long term reliability must considered. This paper reports the fatigue behavior of 100 nm thick silver thin films printed on polyethylene-terephthalate substrate compares it deposited by electron-beam evaporation. show life comparable...