Optical and thermal characterization of albumin protein solders

Karen M. Mc Nally, Brian S. Sorg, Naresh C. Bhavaraju, Mathieu G. Ducros, Ashley J. Welch, Judith M. Dawes

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)


    The effect of temperature on the optical and thermal properties of pure and indocyanine green-doped albumin protein solders as a function of wavelength has been studied between 25 °C and 100 °C. An increase in the group refractive index by up to 4% and a decrease in absorption coefficient (;800 nm) by up to 8%, after denaturing the solder specimens in a constant-temperature water bath at temperatures of 60–100 °C, were not significant. The reduced scattering coefficient, however, increased rapidly with temperature as the solder changed from being a highly nonscattering medium at room temperature to a highly scattering medium at temperatures close to 70 °C. The thermal conductivity, thermal diffusivity, and heat capacity increased by up to 30%, 15%, and 10%, respectively. Finally, the frequency factor and activation energy were measured to be 3.17 × 1056 s-1and 3.79 × 105 J mol-1, respectively, for liquid protein solders (25% bovine serum albumin) and 3.50 × 1057 s-1and 3.85 × 105 J mol-1, respectively, for solid protein solders (60% bovine serum albumin). Incorporation of dynamic optical and thermal properties into modeling studies of laser tissue interactions could have a significant influence on the determination of the expected zone of damage.

    Original languageEnglish
    Pages (from-to)6661-6672
    Number of pages12
    JournalApplied Optics
    Issue number31
    Publication statusPublished - 20 Oct 1999


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