Washington, Aug 2 IANS | 2 months ago

Defying gravitational forces, an Indian-origin scientist-led team has developed a new way of making surfaces that can actively control how fluids or particles move across them.


The discovery may enable new kinds of biomedical or microfluidic devices or solar panels that could automatically clean themselves of dust and grit.

"Most surfaces are passive. They rely on gravity or other forces to move fluids or particles," said Kripa Varanasi, an associate professor of mechanical engineering at Massachusetts Institute of Technology (MIT).

Varanasi's team decided to use external fields such as magnetic fields to make surfaces active, exerting precise control over the behaviour of particles or droplets moving over them.

The system makes use of a microtextured surface, with bumps or ridges just a few micrometers across, that is then impregnated with a fluid that can be manipulated.

"For example, an oil infused with tiny magnetic particles, or ferrofluid, which can be pushed and pulled by applying a magnetic field to the surface," Varanasi explained.


Kripa Varanasi, an associate professor of mechanical engineering at Massachusetts Institute of Technology.

When droplets of water or tiny particles are placed on the surface, a thin coating of the fluid covers them, forming a magnetic cloak.

The thin magnetised cloak can then actually pull the droplet or particle along as the layer itself is drawn magnetically across the surface.

The new approach could lead to systems that make the cleaning process automatic and water-free.

"In the desert environment, dust is present on a daily basis. The issue of dust basically makes the use of solar panels to be less efficient than in North America or Europe. We need a way to reduce the dust accumulation," informed study co-author Numan Abu-Dheir from the King Fahd University of Petroleum and Minerals (KFUPM) in Saudi Arabia.

The paper appeared in the journal Applied Physics Letters.

(Posted on 02-08-2014)

Share This Page:


Post your comments


Information on States of India:

Andaman Nicobar | Andhra Pradesh | Assam | Bihar | Chandigarh | Chhattisgarh | Dadar Nagar Haveli | Daman Diu | Delhi | Goa | Gujarat | Haryana | Himachal Pradesh | Jammu Kashmir | Jharkhand | Karnataka | Kerala | Lakshadweep | Madhya Pradesh | Maharashtra | Manipur | Meghalaya | Mizoram | Nagaland | Orissa | Pondicherry | Punjab | Rajasthan | Sikkim | Tamil Nadu | Tripura | Uttar Pradesh | Uttaranchal | West Bengal

INDIA REGIONAL MAPS:

Andhra Pradesh Travel Map | Bihar Travel Map | Goa Travel Map | Gujarat Travel Map | Haryana Travel Map | Himachal Pradesh Map | Karnataka Travel Map | Kerala Travel Map | Maharashtra Travel Map | Punjab Travel Map | Rajasthan Travel Map | Sikkim Travel Map | Tamil Nadu Travel Map | Uttar Pradesh Travel Map | West Bengal Travel Map |

MORE MAPS OF INDIA:

Airports of India | Districts of India | India Pilgrim Centers | Tourism Map of India | National Highways in India | India Railway Routes |

INDIA CITY MAPS:

Ahmadabad | Bangalore | Chennai | Coimbatore | Delhi | Hyderabad/Secunderabad | Kochi | Kolkata | Mumbai | Pondicherry | Pune | Surat |

KERALA TRAVEL MAPS:

Alappuzha | Ernakulam | Idukki | Kannur | Kasaragod | Kollam | Kottayam | Kozhikode | Malappuram | Palakkad | Pathanamthitta | Thiruvananthapuram | Thrissur | Wayanad |