- Great Dunmow, Essex
This High Voltage Engineer will provide design leadership for high voltage cable assemblies up to one megavolt.
- Recruiter: Essex X-Ray & Medical Equipment
- London (Greater)
- £25,000 - £30,000 starting salary, inclusive of on-target commissions.
Precision Microdrives (PMD) is a fast growing technology company that designs, produces and trades miniature electro-mechanical mechanisms
- Recruiter: Precision Microdrives
- Letchworth Garden City, Hertfordshire
We are innovative, robust and fast growing business, whose main focus is to deliver continues improvement to existing products and offer new soluti...
- Recruiter: Helmet Integrated Systems / Gentex Corporation
- Uppsala (Stad) (SE)
The Swedish Institute of Space Institute (IRF) in Uppsala search for an analogue electronics engineer.
- Recruiter: Swedish Institute of Space Physics (IRF)
- Southampton, Hampshire
- £45,271 to £49,207 per annum
Responsible for technical oversight and project management of internally and externally funded innovation centre projects.
- Recruiter: National Oceanographic Centre
- Cumbernauld, Glasgow
- Grade: 6/7* £26,537 - £37,768*
Work as part of a growing dynamic team on a wide range of technical projects with particular emphasis on experimental validation and testing
- Recruiter: University of Strathclyde
- Peterborough, Cambridgeshire
Mott MacDonald's highly successful Water and Environment Unit is recruiting an electrical engineer....
- Recruiter: Mott MacDonald
- Cambridge, Cambridgeshire
Mott MacDonald's highly successful water business continues to win and deliver a fantastic amount of work....
- Recruiter: Mott MacDonald
- Scotland, Glasgow
Technical Design Authority - Marine Systems (Mechanical) Would you like to play an exciting and varied role working with the River Class Batch 2 (RCB2) vessels for the Royal Navy? We currently have a vacancy for a Technical Design Authority - Marine Syste
- Recruiter: BAE Systems
- York, North Yorkshire
Senior electronics engineer to work as part of a team developing an MEG imaging system; working with the engineering team and external contractors.
- Recruiter: York Instruments
Graphene performance improved by crumpling and creasing
Crinkling graphene makes its wonder properties even better [Credit: Brown University]
Crumpling and creasing graphene makes some of the wonder material's properties even better, researchers have found.
Although crumpling the one-dimensional layer of carbon atoms is not as easy as crumpling a sheet of paper, a team from Brown University found that mastering this process could pave the way for creating better self-cleaning surfaces. The reason is that crumpled graphene appears much more water repellent than the smooth variety. Creased graphene also seems to have better electrochemical properties, opening new possibilities for its use in battery electrodes and fuel cells.
In an article published in the latest issue of the journal Advanced Materials, the team led by post-doctoral fellow Po-Yen Chen, describes the method for creating crinkled graphene. They relied on a type of polymer membrane that shrinks when heated. As the films shrink, the graphene on top compresses and crumples.
The method could be used repeatedly for multiple wrinkling: after the first application, the shrinking substrate is dissolved and the wrinkled graphene layer placed on a new substrate to shrink again.
The team experimented with various ways of crumpling and studied how it affects the properties of the wonder material. Over three generations of crumpling, they were able to reduce the graphene sheet to one fortieth of its original size.
"As you go deeper into the generations you tend to get larger wavelength structures with the original, smaller wavelength structure from earlier generations built into them," said Robert Hurt, a professor of engineering at Brown and one of the paper's corresponding authors.
When experimenting with the highly crumpled sheet of graphene, the researchers found that it has become extremely hydrophobic - virtually impossible to wet with water. As soon as a drop of water touched the surface, it immediately rolled off.
The crumpled graphene was also found to provide 400 per cent higher electrochemical current density over flat graphene sheets, paving the way for much more efficient batteries.
"You don't need a new material to do it," Chen said. "You just need to crumple the graphene."
The team believes that compressed graphene could also open new possibilities for manufacturing of stretchable electronics and wearable sensors.
The team now plans to experiment with crumpling other two-dimensional materials, hoping to see the same effect in the materials’ properties.
"There are many new two-dimensional nanomaterials that have interesting properties, not just graphene," Wong said. "So other materials or combinations of materials may also organise into interesting structures with unexpected functionalities."
"We visit Barcelona, one of the smartest cities in the world, to find out what makes it so special. What does it look like and what is the future?"