Enhanced zeta potential of polyol method synthesized PVP-capped Sb2S3 nanoparticles

Abstract

Analysis of Rietveld refinement of XRD data confirms single phase orthorhombic crystal structure of pure and polyvinyl pyrrolidone (PVP)-capped Sb 2 S 3 nanoparticles (NPs) synthesizedsuccessfully at 190 Cby facile polyol method. Raman modes further confirms their stoichiometric formation. Ratio of Sb to S was found to be a little deviated from 2:3 corresponding to Sb 2 S 3 due to volatile nature of S. A striking effect on the surface charge of Sb 2 S 3 NPs with and without PVP as surfactant was foundin zeta potential (ξ)data collected using deionized water (DIW) for pH values in the range of 3 to 10.5. This reveals that anearly constant ξ of-51.64 mV is found in pH = 6.5 to 8.5 for the PVP-capped Sb 2 S 3 NPs indicating their high stability in DIWcompared to that of unstable nature (ξ =-23.45 mV or less) for pure Sb 2 S 3 NPs. The isoelectronic point is found at pH = 4.2 for PVP-capped Sb 2 S 3, not for pure sample. This information is likely to be useful for many applications like in cosmetics, for waste water treatment,ceramics, pharmaceuticals andin medicine.

Palladium Nanoparticles Functionalized with PVP-Quercetin Inhibits Cell Proliferation and Activates Apoptosis in Colorectal Cancer Cells

“…These results are coincident with the result shown by Vergara-Castañeda et al [58]. However, this result is not consistent with the zeta potential increase from Sb 2 S 3 [56] or Bi 2 S 3 NPs [57], where the increase was related to the hydrodynamic size diminution. Two mechanisms have been reported for NP stabilization: (1) electrostatic stabilization, where the nanoparticles are repelled by the NPs' surface charge, and (2) steric stabilization, where NPs are coated by macromolecules, which generates repelling forces [13,50].…”

“…PdNPs alone showed a size 2120.33 ± 112.53 nm, three times larger than PdNPs-PVP and 16 times larger than PdNPs-PVP-Q (Figure 3a). The size diminution with PVP addition in silver nanoparticles [55], antimony [56], or bismuth [57] has been shown. Surfactant and quercetin addition generated a diminution in size and zeta potential.…”