Home » Agriculture » Indian scientists develop energy efficient smart screens from discarded groundnut shells

Indian scientists develop energy efficient smart screens from discarded groundnut shells

Indian scientists have developed an eco-friendly smart screen from groundnut shells that could help not only in preserving privacy but also in energy conservation by controlling light and heat passing through it and reducing air conditioning load.

A group of researchers led by Prof. S. Krishna Prasad, along with Dr Shankar Rao of the Centre for Nano and Soft Matter Sciences (CeNS), Bangalore, an autonomous institute of the Department of Science & Technology, Government of India has made major headway in developing such a cellulose-based smart screen from discarded ground nutshells.

In the smart screen application, liquid crystal molecules were confined in a polymer matrix. The matrix was built using cellulose nanocrystals (CNC) which were prepared from discarded groundnut shells by Prof. Yuvraj Singh Negi’s team at IIT Roorkee. The refractiveindex of the liquid crystal molecules along a particular direction were altered by the application of an electric field. In the absence of the electric field, there was a mismatch between refractive indices between those of the polymer and the liquid crystal, leading to the scattering of light. Upon application of a few volts of an electric field, the liquid crystal molecules underwent a direction change resulting in the matching of refractive indices, and the device became transparent almost instantaneously.  When the field was turned off, the system quickly recovered the scattering state. This reversible change between the two states available at the flip of a switch occurred over thousands of cycles, with essentially no change in contrast or switching speed.

The device they developed, described in a recent issue of Applied Physics Letters, employed the same principle that causes fog on winter mornings. This happens only when the water droplets are of right size, and it can co-exist along with air. The incoming light sees these two as materials of different refractive indices and thus gets scattered, giving a foggy appearance. Similarly, the polymer and the liquid crystal should co-exist in the right size to create the required optical properties for the smart screen.

Ms Pragnya and Dr Srividhya, the students who worked on the device, emphasize that the protocol for the CNC preparation plays a key role in controlling the device contrast with the IIT Roorkee material outperforming the CNC available from commercial sources.

The scientists said that while, in principal, the device could be developed from any cellulose or agricultural waste, due to certain properties of groundnut waste, the smart screen developed from groundnut waste has been found to be most efficient.

Apart from the original intention of targeted privacy creation, the device can be employed for a whole range of possible applications, especially in energy conservation by controlling the amount and window of infrared light that is permitted to pass. For example, while a window having this technology would remain transparent to the entire visible region, undesirable levels of heat radiation could be significantly reduced, keeping the

enclosure cool.

About IIPnews

Leave a Reply

Your email address will not be published. Required fields are marked *

*

x

Check Also

India has launched 328 satellites from 33 different countries till date

Union Minister of State (Independent Charge) Development of North Eastern Region (DoNER), MoS PMO, Personnel, ...

Scientists find geological evidence of eastern Himalaya earthquake recorded in history

Scientists have found the first geological evidence of an earthquake at Himebasti Village on the ...

Government of India allocates Rs. 16000 crore for Pradhan Mantri Fasal Bima Yojana for 2021-22

To boost the safety of farmers’ crops and ensure maximum benefit of crop insurance reaches ...

Union Budget 2021-22: Agricultural Produce Marketing Committees to get access to Agriculture Infrastructure Fund

In the Union Budget 2021-22, Finance Minister, Nirmala Sitharaman, announced that Agricultural Produce Marketing Committees (APMCs) ...

Experts from central region discussed indigenization of technology, patent and IP rules for grassroot innovators at STIP consultation

Eminent Scientists, thought leaders, academicians, and industry experts of Central Indiahighlighted the need for indigenization of ...

Cabinet approved Minimum Support Price of Copra for 2021 season

The Cabinet Committee on Economic Affairs, chaired by Prime Minister Shri Narendra Modi, has given ...

Successful Flight Test of Smart Anti Airfield Weapon

In yet another milestone, DRDO successfully conducted captive and release trial of indigenously developed Smart ...

DST INSPIRE faculty from Chennai working on alternative anti-cancer therapy using transgenic zebrafish

Scientists are exploring an alternative anti-cancer therapy that involves targeting tumor generated the formation of ...

Biodiversity Conclave brings together Experts to discuss the Concerns Related with the Challenges of Biodiversity and Environment at IISF2020

Sixth India International Science Festival (IISF-2020) is being organized virtually from 22 December, 2020. CSIR ...

Honey FPOs will help in achieving the goal of increasing income of small farmers – Narendra Singh Tomar

The Honey FPO Programme of National Agricultural Cooperative Marketing Federation of India Limited. (NAFED) was ...

WP2Social Auto Publish Powered By : XYZScripts.com