Spontaneous weathering of natural minerals in charged water microdroplets forms nanomaterials

Author:

Spoorthi B. K.1ORCID,Debnath Koyendrila2,Basuri Pallab1ORCID,Nagar Ankit1,Waghmare Umesh V.2ORCID,Pradeep Thalappil13ORCID

Affiliation:

1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.

2. Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India.

3. International Centre for Clean Water, IIT Madras Research Park, Chennai 600113, India.

Abstract

In this work, we show that particles of common minerals break down spontaneously to form nanoparticles in charged water microdroplets within milliseconds. We transformed micron-sized natural minerals like quartz and ruby into 5- to 10-nanometer particles when integrated into aqueous microdroplets generated via electrospray. We deposited the droplets on a substrate, which allowed nanoparticle characterization. We determined through simulations that quartz undergoes proton-induced slip, especially when reduced in size and exposed to an electric field. This leads to particle scission and the formation of silicate fragments, which we confirmed with mass spectrometry. This rapid weathering process may be important for soil formation, given the prevalence of charged aerosols in the atmosphere.

Publisher

American Association for the Advancement of Science (AAAS)

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