Stability analysis of platinum nanoparticles prepared by ESDM in deionised water

Abstract

Electrical discharge machine was used to prepare platinum nanocolloid by electric spark discharge method (ESDM) at room temperature. Preparation of platinum nanocolloid needed only traditional electrical discharge machine, platinum wire (99.5%) and magnet mixer. Then verify whether platinum nanoparticles be could successfully prepared under different preparation and their suspension stability. The optical properties and zeta potential were measured by UV-vis and Zetasizer, and their characteristic peaks (surface plasmon resonant), while suspension stability was analysed. The results of transmission electron microscope showed size, shape and dispersibility of platinum nanoparticles with a size of mostly <10 nm. X-ray diffraction was used to measure crystal lattice structure and component of platinum nanoparticles. In this work, platinum nanocolloid in conditions of normal and centrifuge were analysed. Zeta potential of normal colloid was decreased from −29.5 to −18.8 mV after precipitation, while zeta potential of the centrifuged colloid still maintained at −40 mV, confirming the good suspension stability of platinum nanocolloid prepared by ESDM after centrifugation.

Parameters and properties for the preparation of Cu nanocolloids containing polyvinyl alcohol using the electrical spark discharge method

“…The ESDM, which is frequently used in precision processing, can also be applied to nanocolloid preparation. [28][29][30] The principle is to use a minimal electrode distance and the energy generated by high-electricity fields to achieve an electric field intensity greater than the dielectric strength, causing a dielectric fluid breakdown. The passage of electricity through the two circuits generates a spark discharge that converts electricity to heat and generates high temperatures for component melting and for the removal of the component surface materials.…”

Preparing Cuprous Iodide Nanocolloid by the Electrical Spark Discharge Method

“…A highfrequency pulse voltage is generally applied to the electrodes. When the gap between the electrodes is 30 lm [17,18], the electric field between the two electrodes increases slightly, and the electric field force is at its strongest at this time. The difference in potential between the two electrodes results in electric sparks, which dissociate the surface of the metal or nonmetal electrode [19].…”

Parameter control and property analysis in the preparation of platinum iodide nanocolloids through the electrical spark discharge method

“…12 In the eld of material science, iodine is used to improve the capacity of rechargeable batteries by increasing their energy density; it is also used to enhance the power generation efficiency of solar cells. 13,14 Platinum is applied in many other elds, most of which involve chemical preparation. 15,16 Chemical preparation can generate by products that damage the environment and human health.…”