Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

'By far the greatest danger of Artificial Intelligence is that people conclude too early that they understand it'

 

Eliezer Yudkowsky

Selective nanopores in graphene dramatically improve desalination and purification

RATE THIS! +34
Posted in Science on 2nd Mar, 2014 01:16 AM by AlexMuller

A team of researchers at MIT, Oak Ridge National Laboratory, and in Saudi Arabia succeeded in creating subnanoscale pores in a sheet of graphene, a development that could lead to ultrathin filters for improved desalination or water purification. 

 

The new work, led by graduate student Sean O’Hern and associate professor of mechanical engineering Rohit Karnik, is the first step toward actual production of such a graphene filter.
 
Making these minuscule holes in graphene, a hexagonal array of carbon atoms, like atomic-scale chicken wire, occurs in a two-stage process. First, the graphene is bombarded with gallium ions, which disrupt the carbon bonds.
 
Then, the graphene is etched with an oxidizing solution that reacts strongly with the disrupted bonds, producing a hole at each spot where the gallium ions struck. By controlling how long the graphene sheet is left in the oxidizing solution, the MIT researchers can control the average size of the pores.
 
A big limitation in existing nanofiltration and reverse-osmosis desalination plants, which use filters to separate salt from seawater, is their low permeability: Water flows very slowly through them. The graphene filters, being much thinner, yet very strong, can sustain a much higher flow.
 
“We’ve developed the first membrane that consists of a high density of subnanometer-scale pores in an atomically thin, single sheet of graphene,” O’Hern says.

Tags: waterwater purificationdesalinationgraphenenanotechnologysea

Read original article » Back to category

Comments

Author: Guest
Posted: 2014-03-02
+1
Good progress, having pure water is an essential requirement and this new technology using graphene will be useful- providing, of course, that is cost effective
2 Replies
Author: Guest
Posted: 2014-03-02
+2
Yes, both the required membrane size and costs for the application of producing pure water may be a limitation at present. Reply
Author: Guest
Posted: 2014-03-02
+1
For some other applications, such as for biofiltration, size or cost are not as critical. They suggest the use for removal of unreacted reagents from DNA - helpful Reply
Reply
Author: Guest
Posted: 2014-03-02
+2
Graphene is a promising material and there is a lot interest in graphene, graphene oxide, and other materials for possible use in solar cells, thermoelectric devices, and water filtration, among a number of other applications
4 Replies
Author: Guest
Posted: 2014-03-02
+1
They say that the treatment greatly enhances graphene oxide’s ability to absorb visible light and this is a significant improvement that could be important for its use, for example, as solar cells. Could be an important energy source for the future! Reply
Author: Guest
Posted: 2014-03-02
+0
This will make graphene as a material of huge potential for use in solar cells, thermoelectric devices, solar thermal fuels, and desalination filters.....and more...
Great prospect
Reply
Reply
Author: Guest
Posted: 2014-03-02
+0
It is interesting that researchers are thinking about exploring biological applications of improved graphene, such as sensors for disease agents in the bloodstream, or delivery systems for targeting insoluble drugs to specific areas of the body. This could be very exciting and useful Reply
Author: Guest
Posted: 2014-03-02
+0
Good progress, having pure water is an essential requirement and this new technology using graphene will be useful- providing, of course, that is cost effective Reply
Author: Guest
Posted: 2016-05-06
+0
This forum needed shkaing up and you've just done that. Great post! Reply


 

Recent headlines

  • Posted in Hardware on 2017-03-29 09:24:33
    ExoMars: Mars Rover scientists to study Mawrth Vallis.....read more
    Posted in Software on 2017-03-29 09:20:25
    AI to dominate banking, says report..read more
    Posted in Business on 2017-03-29 09:15:30
    Trump signs order undoing Obama climate change policies..read more
    Posted in Hardware on 2017-03-29 09:08:41
    SpaceX launch of private citizens on a lunar orbiting.....read more
    Posted in Business on 2017-03-28 14:55:07
    Bots shift towards AI and garner $24 billion of investment..read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Intensive medical treatment can reverse type 2 diabetes..read more
    Posted by AlexMuller
    Daily consumption of tea protects the elderly from cognitive.....read more
    Posted by AlexMuller
    New analysis method of metabolites accurately predicts whether.....read more
    Posted by AlexMuller
    Unproven stem cell 'therapy' blinds three patients at Florida.....read more
    Posted by AlexMuller
    Indigenous South American group has healthiest arteries of all.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me