| News Nation | - |
NASA
is planning to establish a deep space gateway in the orbit of the Moon
within the first few missions. The spaceport will be a gateway to deep
space and lunar surface.
|
| NDTV | - |
Graphene sieve turns seawater into drinking water
| The Hindu | - |
(From
left) Vasu Siddeswara Kalangi, Jijo Abraham and Rahul Nair developed
graphene oxide membranes that do not swell when immersed in water.Science
(From left) Vasu Siddeswara Kalangi, Jijo Abraham and Rahul Nair
developed graphene oxide membranes that do not swell when immersed in
water. This allowed the graphene oxide sheets to sieve common salts
present in seawater.
| Photo Credit: Special Arrangement
Graphene sieve turns seawater into drinking water
(From left) Vasu Siddeswara Kalangi, Jijo Abraham and Rahul Nair
developed graphene oxide membranes that do not swell when immersed in
water. This allowed the graphene oxide sheets to sieve common salts
present in seawater.
| Photo Credit: Special Arrangement The pore size in the membrane can be precisely controlled, which can sieve common salts out of salty water and make it safe to drink, researchers say
Researchers, including one of Indian origin, have developed a
graphene-based sieve capable of removing salt from seawater, an advance
that may provide clean drinking water for millions of people.
When immersed in water, graphene-oxide membranes become slightly swollen and smaller salts flow through the membrane along with water, while larger ions or molecules are blocked.
Researchers from University of Manchester in the U.K. have now successfully developed graphene membranes and found a strategy to avoid the swelling of the membrane when exposed to water.
The pore size in the membrane can be precisely controlled, which can sieve common salts out of salty water and make it safe to drink, they said.
When the common salts are dissolved in water, they always form a ‘shell’ of water molecules around the salt molecules.
This allows the tiny capillaries of the graphene-oxide membranes to block the salt from flowing along with the water.
Water molecules are able to pass through the membrane barrier and flow anomalously fast which is ideal for application of these membranes for desalination, researchers said.
“Realisation of scalable membranes with uniform pore size down to atomic scale is a significant step forward and will open new possibilities for improving the efficiency of desalination technology,” said Rahul Nair, professor at University of Manchester.
“The membranes are not only useful for desalination, but the atomic scale tunability of the pore size also opens new opportunity to fabricate membranes with on-demand filtration capable of filtering out ions according to their sizes,” said Jijo Abraham of University of Manchester.
The research was published in the journal Nature Nanotechnology.
When immersed in water, graphene-oxide membranes become slightly swollen and smaller salts flow through the membrane along with water, while larger ions or molecules are blocked.
Researchers from University of Manchester in the U.K. have now successfully developed graphene membranes and found a strategy to avoid the swelling of the membrane when exposed to water.
The pore size in the membrane can be precisely controlled, which can sieve common salts out of salty water and make it safe to drink, they said.
When the common salts are dissolved in water, they always form a ‘shell’ of water molecules around the salt molecules.
This allows the tiny capillaries of the graphene-oxide membranes to block the salt from flowing along with the water.
Water molecules are able to pass through the membrane barrier and flow anomalously fast which is ideal for application of these membranes for desalination, researchers said.
“Realisation of scalable membranes with uniform pore size down to atomic scale is a significant step forward and will open new possibilities for improving the efficiency of desalination technology,” said Rahul Nair, professor at University of Manchester.
“The membranes are not only useful for desalination, but the atomic scale tunability of the pore size also opens new opportunity to fabricate membranes with on-demand filtration capable of filtering out ions according to their sizes,” said Jijo Abraham of University of Manchester.
The research was published in the journal Nature Nanotechnology.
| Deccan Chronicle | - |
More Science stories
Latest study suggests 68 per cent universe might actually not exist
DECCAN CHRONICLE
Published Apr 2, 2017, 9:58 am IST
Updated Apr 2, 2017, 9:58 am IST
Researchers feel that the ‘dark energy’ is what managed to ‘expand’ the universe.
(Representational image)
Universe is large – like very large and we all know that. We
cannot possibly fathom its total accumulation. However, you’d be shocked
to learn that 68 per cent of universe doesn’t even exist.
A new research hailing from the Eötvös Loránd University suggests that on the basis of simulation, 68 per cent of the universe hasn’t been existing. The study further suggests that it is the ‘dark energy’ that accumulating most of the space.
“By taking the changing structure of the universe into account, the researchers argue that accelerated expansion can be explained without the need for dark energy – and, in a way that’s consistent with present observations and general relativity,” DailyMail reported.
“Einstein’s equations of general relativity that describe the expansion of the universe are so complex mathematically, that for a hundred years no solutions accounting for the effect of cosmic structures have been found,” said co-author Dr László Dobos of Eötvös Loránd University.
“We know from very precise supernova observations that the universe is accelerating, but at the same time we rely on coarse approximations to Einstein’s equations which may introduce serious side-effects, such as the need for dark energy, in the models designed to fit the observational data.”
A new research hailing from the Eötvös Loránd University suggests that on the basis of simulation, 68 per cent of the universe hasn’t been existing. The study further suggests that it is the ‘dark energy’ that accumulating most of the space.
“By taking the changing structure of the universe into account, the researchers argue that accelerated expansion can be explained without the need for dark energy – and, in a way that’s consistent with present observations and general relativity,” DailyMail reported.
“Einstein’s equations of general relativity that describe the expansion of the universe are so complex mathematically, that for a hundred years no solutions accounting for the effect of cosmic structures have been found,” said co-author Dr László Dobos of Eötvös Loránd University.
“We know from very precise supernova observations that the universe is accelerating, but at the same time we rely on coarse approximations to Einstein’s equations which may introduce serious side-effects, such as the need for dark energy, in the models designed to fit the observational data.”
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