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A piezo-thermal probe for thermomechanical analysis.

Angelo Gaitas1, Sachi Gianchandani, Weibin Zhu

  • 1PicoCal, Inc., 333 Parkland Plaza, Ann Arbor, Michigan 48103, USA. angelo@picocal.com

The Review of Scientific Instruments
|June 7, 2011
PubMed
Summary

A new micromachined probe enables portable thermomechanical analysis (TMA) without an atomic-force microscope (AFM). This cost-effective device accurately measures material properties like melting temperature.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Thermomechanical analysis (TMA) is crucial for material characterization, determining transition temperatures and thermal expansion.
  • Atomic-force microscopy (AFM) microcantilevers have been previously adapted for TMA, offering high resolution but with complexity and cost.
  • Existing TMA methods often require specialized equipment, limiting accessibility and portability.

Purpose of the Study:

  • To develop a novel, portable, and cost-effective micromachined probe for thermomechanical analysis.
  • To integrate localized heating and precise mechanical deflection sensing into a single, compact probe.
  • To demonstrate the probe's capability in characterizing material properties, such as melting points.

Main Methods:

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  • Development of a micromachined probe featuring two embedded sensors: one for mechanical deflection and one for localized heating.
  • Utilizing a deflection element with a sensitivity of 0.1 ppm/nm and a gauge factor of 3.24.
  • Performing thermomechanical analysis on naphthalene to determine its melting temperature.

    • Main Results:

    • The developed probe successfully performed thermomechanical analysis, eliminating the need for an AFM.
    • The probe's design significantly reduces costs and complexity, enhancing portability.
    • The measured melting temperature of naphthalene was found to be near 78.5 °C, validating the probe's accuracy.

    Conclusions:

    • The novel micromachined probe offers a portable, cost-effective, and simplified alternative for thermomechanical analysis.
    • This technology has the potential to broaden the accessibility of TMA for material characterization.
    • The probe's performance in measuring naphthalene's melting point demonstrates its utility for determining material transition temperatures.