IIT-M researchers show that natural minerals are broken by water droplets to form nanoparticles

Chennai: Researchers with the Indian Institute of Technology, Madras (IIT- M) have shown that common minerals can be broken by water microdroplets to make corresponding nanoparticles, making it the first research paper from the institute to be published in the prestigious Science journal.

Atmospheric water droplets such as clouds and fog can be charged due to ionic species present in them and by contact electrification. Disintegration of minerals make nascent surfaces and on such surfaces, different types of catalysis may occur, forming new molecules and these processes could be important in the origin of life.

The researchers says that ‘microdroplet showers’ composed of nanoparticles and molecules falling on Earth may be of importance to the chemical and biological evolution of the planet.

Science is considered to be one of the world’s top academic journals with articles that consistently rank among the most cited in the world.

The research was led by Prof. Thalappil Pradeep, institute Professor, Chemistry Department, IIT Madras, a Padma Shri awardee, and B K Spoorthi, the first author of the research paper who has just completed her Ph. D from IIT-M.

“Microdroplets are known to enhance chemical reactions, and as a result new chemical bonds form. We thought that it may be possible to break chemical bonds as well in microdroplets. That thought led to this discovery,” Prof Thalappil Pradeep, Institute Professor, Chemistry Department, IIT-M, said.

“The science we reported, if it happens in nature, could be a very important way to transform rocks to natural nanoparticles, which are active ingredients of soil. To put it bluntly, we have found a way to make sand from soil. Looking into the future, I might say that with adequate resources, we can help deserts bloom,” he added.

Elaborating on the important applications of this research, Spoorthi said the finding offers a transformative technique for soil formation, dramatically accelerating natural weathering processes from centuries to moments.

“Beyond its environmental benefits, this method advances nanotechnology and materials science, enabling sustainable and efficient nanoparticle production with broad industrial applications. In their experiment, they found that pieces of minerals such as river sand, ruby and alumina, which are very hard minerals, incorporated in tiny charged water droplets break spontaneously to form nanoparticles, in milliseconds,” Spoorthi added.

Prof. Umesh V Waghmare said, "The phenomenon involves complex processes inherent to microdroplets of water, and understanding its mechanism will stimulate many fundamental scientific studies."

This rapid process of weathering may be important for soil formation, given the prevalence of charged aerosols in the atmosphere. Soil forms through rock weathering, a process involving multiple factors and it takes 200-400 years to yield one centimetre of it normally, composed of varied particle sizes.