Voltage effects on the nanoelectrospray characteristics in fully voltage-controlled atomisation of gold nanocolloids

Ke Wang, J P W Stark

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Abstract

The voltage effects on fully voltage-controlled nanoelectrospraying of aqueous gold nanocolloids were investigated In the nanoelectrospray using 30 mu m nozzle with an increasing of voltage two stable spray regimes of pulsating and cone-Jet mode were clearly observed by a combination of current measurement and fast imaging technology In this nanoelectrospray uniquely determined by the electrical field voltage the current-voltage characteristics were analysed and evaluated based on an equivalent circuit method At high field in cone-Jet regime all the equivalent resistances derived by fitting appear close to a value of 0 53 +/- 003 G Omega showing independence to the conductivity of the nanocolloids In low field pulsating regime a high pulsation frequency up to 100 kHz with relatively stable current pulse was exhibited in all the gold nanocolloids A linear relationship between the DC components in the pulsating current and the voltage was found and the DC equivalent resistance obtained from the fitting varies between 090 and 1 47 G Omega A strong correlation between the pulsating properties and the conductivity of the colloids was identified.
Original languageEnglish
Pages (from-to)81-84
Number of pages4
JournalAnalytica Chimica Acta
Volume679
Issue number1-2
DOIs
Publication statusPublished - 29 Oct 2010

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Keywords

  • electrical conductivity
  • nanoelectrospray characteristics
  • electrohydrodynamic atomisation
  • nanocolloids

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