Droplet size control with methanol-repellent surface in a sampling device for continuous annular electrochromatography
Data(s) |
01/02/2012
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Resumo |
The eluent droplet size defines the number of sampling compartments in a continuously operated annular electrochromatograph and therefore influences separation efficiency. In this work, an assembly of two capillaries, a feeding capillary on the top and a receiving capillary placed under it, has been investigated to control droplet size. The receiving capillary prevents the liquid droplet formation beyond a critical size, which reduces the volume of sampling compartment as compared with the case of the electrolyte flow driven solely by gravity. With a receiving capillary, the electrolyte droplet size was reduced from 1.5 to 0.46 mm. Further decrease of droplet size was not possible due to a so-called droplet jump upwards effect which has been observed on a hydrophilic glass surface with water. A typical electrolyte used in CAEC has high methanol content. In an attempt to improve the methanol-repellent properties of the glass surface, two approaches have been implemented: (i) self-assembled chemisorbed monolayers of an alkylsiloxane and (ii) fabrication of a nano-pin film. The methanol-repellent surface of the feeding capillary suppressed the droplet jump upwards effect. The surface remained methanol repellent in different solutions with lower polarity than that of water. |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Wang , Q , Rebrov , E V & Hessel , V 2012 , ' Droplet size control with methanol-repellent surface in a sampling device for continuous annular electrochromatography ' Journal of Separation Science , vol 35 , no. 3 , pp. 445-451 . DOI: 10.1002/jssc.201100622 |
Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/1600/1602 #Analytical Chemistry #/dk/atira/pure/subjectarea/asjc/1500/1506 #Filtration and Separation |
Tipo |
article |