Synthesis of ZnO Nanoparticles by a Novel Gas Condensation System

Abstract

This paper describes an innovative system to produce nanoparticles based on the theory of gas condensation in producing nanoparticles. In a vaccuum environment, the system used the energy produced by high frequency induction to vaporize a pure zinc rod inside the crucible. During the vaporization the chamber was filled with He gas, so the high-temperatured vaporized metal can undergo momentum exchange with He gas and at the same time, induce the vaporized metal to move to the cold trap. Upon reaching the wall of the cold condenser, the vaporized metal instantly condensed, forming nanoparticles. The TEM image shows that their average diameter was 30 nm, and the size was very consistent. In addition, the Zeta potential and average diameter of the ZnO nanofluid was also measured under different pH conditions to determine the stability of the ZnO nanofluid. Moreover, in order to verify the practicability of the fabricated ZnO nanoparticles, the ZnO nanofluid was inspected by UV/Vis absorption spectrum, and the results show that ZnO nanoparticles absorption ability was within a wavelength range from 350nm to 550nm.

Boron nitride nanotubes-based nanofluids with enhanced thermal properties for use as heat transfer fluids in solar thermal applications

“…The nanofluids showed a wide band centred at lower wavelengths due to the presence of nanomaterial in suspension, this type of band being typical for colloidal suspension systems. This phenomenon is known to mainly take place at lower wavelengths [55]. Therefore, the extinction signal of incident radiation measured at λ=335 nm was analysed for one month, and the variations in signal are shown in Figure 2.…”

Synthesis Approaches of Zinc Oxide Nanoparticles: The Dilemma of Ecotoxicity

“…Majorly, heat evolving from high temperature processes may cause heat edema, heat rashes, heat cramps, heat exhaustion, heat syncope, and heat strokes [113]. A number of methods in synthesis of ZnO NP involve high temperatures, for example, hybrid electrochemical thermal method (60-700 ∘ C) [114], gas condensation method (595 ∘ C) [115], direct thermal decomposition method (600 ∘ C) [116], spray pyrolysis method (1200 ∘ C) [117], and high Journal of Nanomaterials 7 temperature mixing hydrothermal processes (160-200 ∘ C) [118], that might be lethal.…”

CoFe2O4–ZnO nanoparticles for rapid microwave‐assisted tryptic digestion of phosphoprotein and phosphopeptide analysis by matrix‐assisted laser desorption/ionization mass spectrometry

“…At pH 9.3, the surface of ZnO nanoparticles is accounted as neutral charge. However, below pH 9.3, the particle surface become positively charge, and vice versa . These characteristics of ZnO nanoparticles were used for the enrichment of phosphopeptides at neutral pH (pH 7).…”