EDEN IAS

NEWS IMPULSE – SELF-CLEANING NON-TOXIC COLOURS | 03 NOVEMBER

<p style=”margin-bottom: 13px; text-align: center;”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><b><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>Source- DD News</span></span></span></b></span></span></span></p>

<p style=”margin-bottom: 13px; text-align: center;”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><b><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>GS Paper – 3</span></span></span></b></span></span></span></p>

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<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Developed by -Self-cleaning non-toxic colours developed by CeNS can brighten up textiles, automobiles, decorations.</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Self-cleaning, nontoxic artificial colours developed by scientists mimicking colouring technique found in nature in peacock feathers, butterfly wings and gem opals may soon brighten up in textiles, automobiles, and decorations.</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Dyes and pigments which we depend on for colouring are not safe for human health and at the same time suffer with stability issues as it degrades with thermal energy, humidity, and UV exposure and so on</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Scientists from the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous institute of the Department of Science &amp; Technology (DST), Govt. of India, have fabricated structural colours artificially. The structural colours were produced by deposition of nanorods and </span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Thin films of titanium dioxide (TiO2) on titanium sputtered hard and flexible surfaces utilizing a method known as glancing angle deposition (GLAD)the colours are due to interference phenomenon and can be manipulated by varying thickness and refractive index of the TiO2 layer.</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Aluminium, nickel, cobalt and copper can be used as an alternative to titanium.</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; Although structural colours are stable, the environmental pollutants sit on the surface of the structural colours and redefine the hue. So to maintain the hue, regular cleaning of the surface is needed, which is cumbersome and costly .</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; This problem has been solved by making the surface of the colourssuperhydrophilic, making it a self-cleaning surface.</span></span></span></span></span></span></p>

<p style=”margin-bottom:13px”><span style=”font-size:11pt”><span style=”line-height:115%”><span style=”font-family:Calibri,sans-serif”><span style=”font-size:12.0pt”><span style=”line-height:115%”><span style=”font-family:&quot;Cambria&quot;,&quot;serif&quot;”>&bull; (A permanent self-cleaning state (tested up to 1 year) has been obtained with controlled heat treatment at elevated temperatures. Heat treatment at controlled temperatures has also helped in tuning colours and opaqueness of the colours on glasses.)</span></span></span></span></span></span></p>

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