A system that uses a laser and electrical current to precisely position and align carbon nanotubes represents a potential new tool for creating electronic devices out of the tiny fibers.
Because carbon nanotubes have unique thermal and electrical properties, they may have future applications in electronic cooling and as devices in microchips, sensors and circuits. Being able to orient the carbon nanotubes in the same direction and precisely position them could allow these nanostructures to be used in such applications.
However, it is difficult to manipulate something so small that thousands of them would fit within the diameter of a single strand of hair, said Steven T. Wereley, a professor of mechanical engineering at Purdue University.
“One of the things we can do with this technique is assemble carbon nanotubes, put them where we want and make them into complicated structures,” he said.
New findings from research led by Purdue doctoral student Avanish Mishra are detailed in a paper that has appeared online March 24 in the journal Microsystems and Nanoengineering, published by the Nature Publishing Group.
The technique, called rapid electrokinetic patterning (REP), uses two parallel electrodes made of indium tin oxide, a transparent and electrically conductive material. The nanotubes are arranged randomly while suspended in deionized water. Applying an electric field causes them to orient vertically. Then an infrared laser heats the fluid, producing a doughnut-shaped vortex of circulating liquid between the two electrodes. This vortex enables the researchers to move the nanotubes and reposition them.
“When we apply the electric field, they are immediately oriented vertically, and then when we apply the laser, it starts a vortex, that sweeps them into little nanotube forests,” Wereley said.
The research paper was authored by Mishra; Purdue graduate student Katherine Clayton; University of Louisville student Vanessa Velasco; Stuart J. Williams, an assistant professor of mechanical engineering at the University of Louisville and director of the Integrated Microfluidic Systems Laboratory; and Wereley. Williams is a former doctoral student at Purdue.
The technique overcomes limitations of other methods for manipulating particles measured on the scale of nanometers, or billionths of a meter. In this study, the procedure was used for multiwalled carbon nanotubes, which are rolled-up ultrathin sheets of carbon called graphene. However, according to the researchers, using this technique other nanoparticles such as nanowires and nanorods can be similarly positioned and fixed in vertical orientation.
The researchers have received a U.S. patent on the system.
The Latest on: Carbon nanotubes
No news articles
via Google News
The Latest on: Carbon nanotubes
- DNA helps scientists engineer structures at the molecular levelon August 7, 2022 at 7:34 pm
The new research could open the door to revolutionary breakthroughs in faster and more energy efficient technologies.
- Electronic tattoos could monitor vital signs like heart rate and analyze sweaton August 6, 2022 at 7:35 am
Researchers say this experimental e tattoo can monitor vital signs like heart rate and analyze sweat. It could even act as *** heater for physical therapy. Plus there are no needles needed when apply ...
- The Coming Copper Shortage: Aluminium Or Carbon Nanotubes To The Rescue?on August 2, 2022 at 5:00 pm
Carbon-based structures, such as carbon nanotubes (CNTs) have much higher electrical conductivity than copper, as does graphene. The main issue is that making wires out of them is not exactly ...
- Carbon Nanotubes and Related Structureson August 2, 2022 at 4:22 pm
Carbon nanotubes are molecular-scale carbon fibres with structures related to those of the fullerenes. Since their discovery in 1991, they have captured the imagination of physicists, chemists and ...
- Carbon Nanotubes Market Review | Emerging Trends of CNTs Application Driving the Growth - MDC Researchon August 1, 2022 at 5:16 pm
Pune, July 25, 2022 (GLOBE NEWSWIRE) -- Carbon Nanotubes Market by Vendor Assessment, Technology Assessment, Partner & Customer Ecosystem, type/solution, service, organization size, end-use vertic ...
- Carbon Nanotubes Market Trends Evaluation, Segmentation, Challenges, And Opportunities Analysis Till 2030on August 1, 2022 at 1:04 am
The world carbon nanotubes market was $1,033 million in 2015 and is expected to reach $3,812 million by 2022, registering a CAGR of 20.6% from 2016 to 2022. Report Ocean recently added a research ...
- Twisted CNT Yarn with Great Potential for Smart Textile Applicationson July 29, 2022 at 7:24 pm
Carbon nanotube (CNT) yarn is highly coveted in the smart textiles industry and multifunctional composites because of its light weight and versatility. However, its production is quite challenging due ...
- N-doped Carbon Nanotubes Optimized for Electromagnetic Wave Absorptionon July 29, 2022 at 7:24 pm
N-doped carbon nanotubes offer exceptional electromagnetic wave absorption due to their remarkable structural advantages. In an article published in the journal Carbon, Mn sites with atomic dispersion ...
- Twin physically unclonable functions (PUFs) based on carbon nanotube arrays to enhance the security of communicationson July 28, 2022 at 8:30 am
As the amount of data stored in devices and shared over the internet continuously increases, computer scientists worldwide are trying to devise new approaches to secure communications and protect ...
via Bing News