Speaker: Dr. Roeland Dijkema (VSParticle B.V. )
|Date||19 June 2018|
Venue: Science Park 904, room D1.110
Spark ablation is a versatile technique for the production of very small particles, ranging from single atoms, to about 10nm. Short electric discharges (sparks) in mild environment ablate the surface of two target electrodes, and the resulting metal vapor condenses in a flow of gas. Changing spark ener- gy, spark repetition rate and gas flow allows control over particle size. The VSParticle Generator 1 (VSP-G1) is a com- pact, benchtop version of the system developed by Schmidt-Ott (1988), with additional flow ports and au- tomated gap control. Because of the localized heating in the spark, spark ablation is generally considered a good source of 'uncontaminated' particles. The particles can be used to functionalize a wide variety of substrates, including Si windows, (in-situ)TEM grids and nanowires for e.g. model catalyst development.