Quartz micropipettes for intracellular voltage microelectrodes and ion-selective microelectrodes

Area of Science:

• Materials Science
• Electrochemistry
• Analytical Chemistry

Background:

• Micropipettes are crucial tools in microelectrode applications.
• Borosilicate glass is a common material, but limitations exist for certain sensitive measurements.
• Advancements in micropipette fabrication are needed for improved performance.

Purpose of the Study:

• To evaluate quartz as a superior material for micropipettes compared to borosilicate glass.
• To present novel methods for fabricating and treating quartz micropipettes.
• To report on the performance of these specialized micropipettes in microelectrode applications.

Main Methods:

• Fabrication of quartz micropipettes using a modified microelectrode puller with a graphite heating element.
• Development and application of a novel silanization technique for micropipettes.
• Utilizing a miniature beveller mounted on a microscope stage for micropipette tip modification.

Main Results:

• Quartz micropipettes demonstrate enhanced suitability over borosilicate glass for specific applications, notably liquid membrane ion-selective microelectrodes.
• Successful fabrication of quartz micropipettes was achieved using the described graphite heating element setup.
• The novel silanization method and miniature beveller provided precise control and improved micropipette characteristics.

Conclusions:

• Quartz is a preferred material for fabricating micropipettes in demanding microelectrode applications.
• The presented fabrication and treatment methods offer practical solutions for creating high-performance quartz micropipettes.
• These advancements contribute to improved accuracy and reliability in electrochemical measurements using microelectrodes.