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Volume 2005, 2005, Article number 1548461, Pages 323-325

Novel technological process to manufacture ceramic microelectrodes for biomedical applications implying microextrusion of preceramic precursors

 

Perale, G., Maccagnan, S., Contro, R.

Abstract

A novel technological process is under development to obtain ceramic microelectrodes from preceramic precursors, basically for biomedical applications. A microextrusion approach is applied. Commercially available silicone resins are used as preceramic polymers. Drugging with carbon black results in electrically conductive ceramics. A coextrusion approach is used to obtain the filament with inner conductive lines. Chemical reticulation and pyrolysis are applied to convert polymeric resins into ceramics. Some different geometries of profiles and cross sections can be considered and obtained. Circular microelectrodes can be provided with diameters in the range between 100μm and 5mm and wide coextrusion dimension ratios are obtainable. Preliminary results on filaments with diameter between 100μm and 500μm showed bending strength ranging from 30MPa to 1100MPa and average conductivity of 0.375 1/Ωcm for a 50% weight carbon black load. Selecting such characteristics and related materials mainly depends on specific applications. Biomedical electrodes can be devised as stimulators or sensors in neurosurgery, beep brain stimulation and cell biology. It’s important to achieve strict control of the above characteristics demanded by desired performances and obtained by suitably adjusting the technological process. Such control is hard to attain for great sensitiveness of some features of microgeometry and micro-structure to process parameters.

Author Keywords

Ceramic-based microelectrodes; Electrically conductive ceramics; Extrusion; Preceramic polymers

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