Press Esc to close
Monday 25 September 2017
News updated at 2:36 AM IST

Ultra-thin carbon nanotubes can desalinate seawater

Press Trust of India, Washington, Aug 30 2017, 17:23 IST
An artist's depiction of the promise of carbon nanotube porins for desalination. The image depicts a stylized carbon nanotube pipe that delivers clean desalinated water from the ocean to a kitchen tap. Image by Ryan Chen/LLNL

An artist's depiction of the promise of carbon nanotube porins for desalination. The image depicts a stylized carbon nanotube pipe that delivers clean desalinated water from the ocean to a kitchen tap. Image by Ryan Chen/LLNL

Scientists have developed carbon nanotubes over 50,000 times thinner than a human hair which can quickly and effectively separate salt from seawater, an advance that may help solve the global water crisis.

Increasing demands for fresh water pose a global threat to sustainable development, resulting in water scarcity for four billion people, researchers said.

Current water purification technologies can benefit from the development of membranes with specialised pores that mimic highly efficient and water selective biological proteins.

Scientists, including those from Northeastern University in the US, developed carbon nanotube pores that can exclude salt from seawater.

The team found that water permeability in carbon nanotubes (CNTs) with diameters of 0.8 nanometre significantly exceeds that of wider carbon nanotubes.

The nanotubes, hollow structures made of carbon atoms in a unique arrangement, are more than 50,000 times thinner than a human hair.

The super smooth inner surface of the nanotube is responsible for their remarkably high water permeability, while the tiny pore size blocks larger salt ions.

"We found that carbon nanotubes with diameters smaller than a nanometre bear a key structural feature that enables enhanced transport," said Ramya Tunuguntla, a postdoctoral researcher at Lawrence Livermore National Laboratory (LLNL) in the US.

"The narrow hydrophobic channel forces water to translocate in a single-file arrangement, a phenomenon similar to that found in the most efficient biological water transporters," said Tunuguntla.

Computer simulations and experimental studies of water transport through CNTs with diameters larger than one nanometre showed enhanced water flow, but did not match the transport efficiency of biological proteins and did not separate salt efficiently, especially at higher salinities.

The key breakthrough achieved by the LLNL team was to use smaller-diameter nanotubes that delivered the required boost in performance.

"Carbon nanotubes are a unique platform for studying molecular transport and nanofluidics," said Alex Noy principal investigator at LLNL.

"Their sub-nanometre size, atomically smooth surfaces and similarity to cellular water transport channels make them exceptionally suited for this purpose, and it is very exciting to make a synthetic water channel that performs better than nature's own," said Noy.

The research was published in the journal Science.

Go to Top

Photo Gallery
An artist decorate the idol Goddess Durga with a saree made of pure gold at a...

An artist decorate the idol Goddess Durga with a saree made of pure gold at a...

Artist perform ballet Swan Lake is the most beloved, classic and quintessential ballet...

Artist perform ballet Swan Lake is the most beloved, classic and quintessential ballet...

Children dressed as Lord Hanuman take part in a procession during Langur Mela at the...

Children dressed as Lord Hanuman take part in a procession during Langur Mela at the...

Bollywood actress Vaani Kapoor walks the ramp as showstopper at the...

Bollywood actress Vaani Kapoor walks the ramp as showstopper at the...

Bollywood actress Richa Chadda and Kalki Koechlin during the shooting of a song for their...

Bollywood actress Richa Chadda and Kalki Koechlin during the shooting of a song for their...

Women dance on the occasion of Lalita Panchami during Navratri celebrations at a pandal, in...

Women dance on the occasion of Lalita Panchami during Navratri celebrations at a pandal, in...

A pandal, themed on the Jagannath Temple of Odisha, in Ranchi on Sunday ahead of the...

A pandal, themed on the Jagannath Temple of Odisha, in Ranchi on Sunday ahead of the...

Union Minister for Defence, Nirmala Sitharaman and the Chief of Army Staff, General Bipin Rawat...

Union Minister for Defence, Nirmala Sitharaman and the Chief of Army Staff, General Bipin Rawat...

Tollywood actor Mahesh Babu with actress Rakul Preet Singh and director A.R. Murugadoss during a...

Tollywood actor Mahesh Babu with actress Rakul Preet Singh and director A.R. Murugadoss during a...

Armed forces during a multi agency exercise 'Pralay Sahayam' conducted at...

Armed forces during a multi agency exercise 'Pralay Sahayam' conducted at...

Like us on Facebook

Copyright 2017, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523
Powered by Yodasoft Technologies Pvt. Ltd.