Mechanical properties of nanomaterials can be altered due to the application of voltage, University of Wyoming researchers have discovered.
The researchers, led by TeYu Chien, a UW assistant professor in the Department of Physics and Astronomy, determined that the electric field is responsible for altering the fracture toughness of nanomaterials, which are used in state-of-the-art electronic devices. It is the first observed evidence that the electric field changes the fracture toughness at a nanometer scale.
This finding opens the way for further investigation of nanomaterials regarding electric field-mechanical property interactions, which is extremely important for applications and fundamental research.
Chien is the lead author of a paper, titled “Built-in Electric Field Induced Mechanical Property Change at the Lanthanum Nickelate/Nb-doped Strontium Titanate Interfaces,” that was recently published in Scientific Reports. Scientific Reports is an online, open-access journal from the publishers of Nature. The journal publishes scientifically valid primary research from all areas of the natural and clinical sciences.
Other researchers who contributed to the paper are from the University of Arkansas, University of Tennessee and Argonne National Laboratory in Argonne, Ill.
Chien and his research team studied the surfaces of the fractured interfaces of ceramic materials, including lanthanum nickelate and strontium titanate with a small amount of niobium. The researchers revealed that strontium titanate, within a few nanometers of the interfaces, fractured differently from the strontium titanate away from the interfaces.
The two ceramic materials were chosen because one is a metallic oxide while the other is a semiconductor. When the two types of materials come into contact with each other, an intrinsic electric field will automatically be formed in a region, known as the Schottky barrier, near the interface, Chien explains. The Schottky barrier refers to the region where an intrinsic electric field is formed at metal/semiconductor interfaces.
The intrinsic electric field at interfaces is an inevitable phenomenon whenever one material is in contact with another. The electric field effects on the mechanical properties of materials are rarely studied, especially for nanomaterials. Understanding electric field effects is extremely important for applications of nanoelectromechanical system (NEMS), which are devices, such as actuators, integrating electrical and mechanical functionalities on the nanoscale.
For NEMS materials made in nanoscale, understanding the mechanical properties affected by electric fields is crucial for full control of device performance. The observations in this study pave the way to better understand the mechanical properties of nanomaterials.
“The electric field changes the inter-atomic bond length in the crystal by pushing positively and negatively charged ions in opposite directions,” Chien says. “Altering bond length changes bond strength. Hence, the mechanical properties, such as fracture toughness.”
“The whole picture is this: The intrinsic electric field in the Schottky barrier was created at the interfaces. This then polarized the materials near the interfaces by changing the atomic positions in the crystal. The changed atomic positions altered the inter-atomic bond length inside the materials to change the mechanical properties near the interfaces,” Chien summarizes.
The Latest on: Mechanical properties of nanomaterials
via Google News
The Latest on: Mechanical properties of nanomaterials
- Picoscience and a plethora of new materialson October 7, 2019 at 6:03 am
The revolutionary tech discoveries of the next few decades, the ones that will change daily life, may come from new materials so small they make nanomaterials look like lumpy behemoths ... and ...
- Carbon-based polymer nanocomposite membranes for oily wastewater treatmenton October 4, 2019 at 2:26 am
Carbon-based nanomaterials, including graphene and graphene-oxide (GO), carbon nanotubes (CNTs), and carbon nanofibers (CNFs), have gained tremendous attention due to their unique physicochemical ...
- Emerging uses of DNA mechanical deviceson September 12, 2019 at 10:51 am
Mechanical forces on this scale ... shifting nanomachines that can precisely reposition nanomaterials (1). DNA mechanotechnology tools have played important roles in studies of the fundamental ...
- Mechanical properties of nanomaterials are altered due to electric field, researchers findon January 8, 2019 at 4:00 pm
The electric field effects on the mechanical properties of materials are rarely studied, especially for nanomaterials. Understanding electric field effects is extremely important for applications of ...
- Thermal Analysis of Nanomaterialson June 26, 2018 at 5:00 pm
Nanomaterials have very diverse properties ... is usually increased with nanoparticles because of their greatly increased surface area. Mechanical properties can also be changed using nanoparticles.
- Chapter 7: Effect of the Grain Size and Interfaces on the Properties of Bulk Nanomaterialson February 21, 2018 at 2:09 am
For this reason, the level of understanding of the structure and properties of the bulk nanocrystalline materials is considerably lower in comparison with isolated nanoparticles. The properties of ...
- 8.4: Physical Properties of Nanomaterialson February 18, 2018 at 12:50 am
Some such peculiar properties are known, but there may be a lot more to be discovered. Some known physical properties of nanomaterials are related ... atoms in the total amount of atoms. Mechanical ...
- Mechanical Properties of Nanomaterials Are Altered Due to Electric Field, UW Researchers Findon January 8, 2016 at 9:59 am
His research determined that the electric field is responsible for the alteration of the fracture toughness of nanomaterials, which are used in state-of-the-art electronic devices. (UW Photo) ...
- Mechanical properties of nanomaterials are altered due to electric field, researchers findon January 7, 2016 at 4:00 pm
Mechanical properties of nanomaterials can be altered due to the application of voltage, University of Wyoming researchers have discovered. The researchers, led by TeYu Chien, a UW assistant professor ...
- Mechanical properties of nanomaterials are altered due to electric fieldon January 7, 2016 at 4:00 pm
Researchers for the first time have found that the electric field changes the fracture toughness of nanomaterials. The researchers, led by TeYu Chien, a UW assistant professor in the Department of ...
via Bing News