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Violin Varnishes: Microstructure and Nanomechanical Analysis.

Marianne Odlyha1, Jeannette J Lucejko2, Anna Lluveras-Tenorio2

  • 1Department of Biological Sciences, Birkbeck, University of London, London WC1E 7HX, UK.

Molecules (Basel, Switzerland)
|October 14, 2022
PubMed
Summary

This study used atomic force microscopy (AFM) to analyze violin varnishes. Spirit-based varnishes were found to be stiffer and penetrate less than oil-based varnishes.

Keywords:
AFMSR micro-FTIRin situ imagingnanomechanicsviolin

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Area of Science:

  • Materials Science
  • Surface Science
  • Analytical Chemistry

Background:

  • Traditional violin varnishes are crucial for instrument acoustics and preservation.
  • Understanding varnish properties at the nanoscale is essential for conservation and restoration efforts.

Purpose of the Study:

  • To apply in situ non-invasive atomic force microscopy (AFM) for analyzing violin surfaces.
  • To conduct nanoscale compositional and mechanical analysis of traditional oil- and spirit-based wood varnishes.
  • To investigate the effects of natural and accelerated light aging on these varnishes.

Main Methods:

  • Portable atomic force microscopy (AFM) for in situ surface imaging and nanomechanical property measurement.
  • Synchrotron radiation micro-Fourier Transform Infrared (μ-FTIR) spectroscopy for layer structure analysis.
  • PeakForce Quantitative Nanomechanical Mapping (QNM) to assess adhesion properties.

Main Results:

  • Spirit-based varnishes were found to be stiffer than oil-based varnishes.
  • Spirit-based varnishes exhibited less penetration into the maple wood substrate compared to oil-based varnishes.
  • Distinct differences in adhesion values were observed between oil- and spirit-based varnish samples.

Conclusions:

  • AFM is a valuable tool for non-invasive nanoscale analysis of historical instrument varnishes.
  • Varnish type significantly influences mechanical properties and wood penetration, impacting long-term stability.
  • These findings contribute to a deeper understanding of traditional varnish behavior for conservation purposes.