A radial differential mobility analyzer for the size-classification of gas-phase synthesized nanoparticles at low pressures

Nanda, KK and Kruis, FE (2014) A radial differential mobility analyzer for the size-classification of gas-phase synthesized nanoparticles at low pressures. In: MEASUREMENT SCIENCE & TECHNOLOGY, 25 (7).

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Abstract

Differential mobility analyzers (DMAs) are commonly used to generate monodisperse nanoparticle aerosols. Commercial DMAs operate at quasi-atmospheric pressures and are therefore not designed to be vacuum-tight. In certain particle synthesis methods, the use of a vacuum-compatible DMA is a requirement as a process step for producing high-purity metallic particles. A vacuum-tight radial DMA (RDMA) has been developed and tested at low pressures. Its performance has been evaluated by using a commercial NANO-DMA as the reference. The performance of this low-pressure RDMA (LP-RDMA) in terms of the width of its transfer function is found to be comparable with that of other NANO-DMAs at atmospheric pressure and is almost independent of the pressure down to 30 mbar. It is shown that LP-RDMA can be used for the classification of nanometer-sized particles (5-20 nm) under low pressure condition (30 mbar) and has been successfully applied to nanoparticles produced by ablating FeNi at low pressures.

Item Type:	Journal Article
Publication:	MEASUREMENT SCIENCE & TECHNOLOGY
Publisher:	IOP PUBLISHING LTD
Additional Information:	Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Keywords:	differential mobility analyzer (DMA); size selection; monodisperse nanoparticles
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Aug 2014 11:57
Last Modified:	13 Aug 2014 11:57
URI:	http://eprints.iisc.ac.in/id/eprint/49632

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