University of Twente Student Theses


Electrospray from glass capillaries

Tiem, Joël van (2012) Electrospray from glass capillaries.

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Abstract:Electrospray from glass capillaries with 10 and 1 �m diameter apertures at 10 to 30 �m capillary-electrode distances has been performed. Electrospray denotes the process in which subjecting a liquid to high potentials leads to ejecting a small jet and �nally dispersal of the liquid. Among the various applications of electrospray are soft ionization techniques and micro- and nano droplet fabrication. Interest lies in the miniaturization of the spraying process without su�ering from electrical breakdown by reducing the applied voltages. This can be achieved by reducing the capillary-electrode distance. Another approach would be increasing the pressure applied to the capillary. Both methods have been studied. Focus lies on the design, construction and testing of a setup which is able to perform electrospray from apertures with 100 nm to 10 �m diameter. The setup provides a safe environment in which the electrospray process can be studied precisely. Among the most important characteristics is the ability to tune and measure the capillary-electrode distance very accurately. Results from measurements with 1 �m apertures at a capillary-electrode distance of 10 �m show electrospray is possible using sub kilovolt potentials. Optical analysis verify actual electrospray rather than just electrical breakdown takes place in this con�guration. Increasing pressure or decreasing capillary-electrode distances proved to reduce the voltage needed to start the spraying.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:50 technical science in general
Programme:Advanced Technology BSc (50002)
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