Question

Which of the following electrode is manufactured by circumferential application of heat to a small area of glass tubing and pulling the glass when it gets soft?

(a) macro metallic electrodes

(b) micro metallic electrodes

(c) micro pipette

(d) surface electrodes

I had been asked this question at a job interview.

I want to ask this question from Microelectrodes in portion Bioelectric Signal and Electrodes of Biomedical Instrumentation

Answer 1

Right choice is (c) micro pipette

To explain I would say: The most commonly used method for making small tip micropipette consists of the circumferential application of heat to a small area of glass tubing which is placed under some initial tension. When the glass softens, the tension is increased very rapidly and the heat is turned off. Proper timing, controlled adjustment of the amount of heat as well as the initial and final tensions and cooling results in the production of microcapillaries with control dimensions.