Molecular dynamics simulation on surface modification of quantum scaled CuO nano-clusters to support their experimental studies

Abstract

Interest in nanoparticle modification using functional chemicals has increased rapidly, as it allows more freedom of physiochemical tuning of the nanoparticle’s surface into biomedically oriented and designated properties. However, the observation and detection of the thin molecular layers on the nanoparticle surface are very challenging under current analytical facilities. The focus of this research is to demonstrate fundamental interactions between the surface treated nanoparticles and their host liquid media using lab-based experimentation and simulation. In this research, investigation has been carried out on analyzing the surface compatibility and the diffusivity of modified CuO nanoparticles (CuONPs) with short-chain carboxylate-terminated molecules in biofluids. Moreover, during the current Covid-19 pandemic, the Cu/CuONPs have proved effective in killing SARS-CoV1/2 and other airborne viruses. This research was conducted at the molecular level with joint consideration of experimental and simulation studies for characterization of variables. Experimental tests conducted using Fourier Transform Infrared (FTIR) spectroscopy demonstrated several spectral ranges of interest, specifically, detection of three major carboxylate attachments (i.e., 1667–1609 cm−1, 1668–1557 cm−1, etc.) were found. From simulation, similar attachment styles were observed by the LAMMPS simulation package that mimicked similar agglomerations with a predicted diffusion coefficient as recorded to be 2.28E−9 m2/s. Viscosities of modified nanofluids were also compared with unmodified nanofluids for defining aggregation kinetics.

Salicylic Acid-Modified Sm-TiO2 for Photoluminescence and Photocatalysis under Real Sunlight: Synergistic Effects between Ligand-to-Metal Charge Transfer (LMCT) and Sm3+ Dopant

“…For the Sm-TiO 2 /SA complexes, some aggregation was observed, likely due to the formation of a chemical bond between the SA ligand and the Sm-TiO 2 surface. This explanation has also been proposed in carboxylic acid-modified CuO nanoparticles by Loya et al 22 Table 2 reports the Sm/Ti molar percentage of a set of selected samples, as determined by both EDX and XPS. It should be remarked that the latter technique is more representative of the surface composition of materials, whereas EDX should be able to evaluate also inner atomic layers, though in a semiquantitative way.…”