Laser cleaning of undyed silk: indications of chemical change

Karin von Lerber, Matija Strlic, Jana Kolar, Jörg Krüger, Simone Pentzien, Craig J Kennedy, Timothy J Wess, Marina Sokhan, Wolfgang Kautek

    Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

    Abstract

    Three different undyed, unweighed silk fabrics (new clean, new soiled, and naturally aged) were cleaned with a computer-controlled Q-switched Nd:YAG laser at 532nm in 30 combinations of fluence and pulse numbers. They were studied for chemical change by viscometry, X-ray diffraction, and FIB-SIMS in combination with temperature calculations. While physical changes only occurred above the tested parameters, chemical changes could be detected as low as 0.2 J cm?2 with four pulses. Yellowing was observed at lower and bleaching at higher fluence/pulse number combinations. Melting was observed in naturally aged silk cleaned with 64 pulses at 4.2 J cm?2. The temperature reached at 0.1 J cm?2 is sufficient to evaporate carbon. Excess energy is transferred into the silk substrate causing thermal degradation. Different chemical processes leading to chain scission and to crosslinking seem to occur simultaneously, even at low fluence and pulse number. An increase in pulse numbers also leads to increasing damage.
    Original languageEnglish
    Title of host publication Lasers in the Conservation of Artworks
    Subtitle of host publicationLACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005
    EditorsMag Johann Nimmrichter, Wolfgang Kautek, Manfred Schreiner
    PublisherSpringer
    Pages313-320
    Number of pages8
    ISBN (Electronic)9783540721307
    ISBN (Print)9783540721291
    DOIs
    Publication statusPublished - 2007
    EventLasers in the Conservation of Artworks - Vienna, Austria
    Duration: 21 Sep 200525 Sep 2005

    Publication series

    NameSpringer Proceedings in Physics
    Volume116
    ISSN (Print)0930-8989

    Conference

    ConferenceLasers in the Conservation of Artworks
    Abbreviated titleLACONA VI
    CountryAustria
    CityVienna
    Period21/09/0525/09/05

    Fingerprint

    silk
    cleaning
    indication
    pulses
    lasers
    fluence
    viscometry
    thermal degradation
    Q switched lasers
    bleaching
    crosslinking
    secondary ion mass spectrometry
    YAG lasers
    cleavage
    melting
    damage
    temperature
    carbon
    diffraction
    x rays

    Cite this

    von Lerber, K., Strlic, M., Kolar, J., Krüger, J., Pentzien, S., Kennedy, C. J., ... Kautek, W. (2007). Laser cleaning of undyed silk: indications of chemical change. In M. J. Nimmrichter, W. Kautek, & M. Schreiner (Eds.), Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005 (pp. 313-320). (Springer Proceedings in Physics; Vol. 116). Springer. https://doi.org/10.1007/978-3-540-72130-7_36
    von Lerber, Karin ; Strlic, Matija ; Kolar, Jana ; Krüger, Jörg ; Pentzien, Simone ; Kennedy, Craig J ; Wess, Timothy J ; Sokhan, Marina ; Kautek, Wolfgang. / Laser cleaning of undyed silk: indications of chemical change. Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. editor / Mag Johann Nimmrichter ; Wolfgang Kautek ; Manfred Schreiner. Springer, 2007. pp. 313-320 (Springer Proceedings in Physics).
    @inbook{d7abc112e5964a4cbcaad7212b5cfbbe,
    title = "Laser cleaning of undyed silk: indications of chemical change",
    abstract = "Three different undyed, unweighed silk fabrics (new clean, new soiled, and naturally aged) were cleaned with a computer-controlled Q-switched Nd:YAG laser at 532nm in 30 combinations of fluence and pulse numbers. They were studied for chemical change by viscometry, X-ray diffraction, and FIB-SIMS in combination with temperature calculations. While physical changes only occurred above the tested parameters, chemical changes could be detected as low as 0.2 J cm?2 with four pulses. Yellowing was observed at lower and bleaching at higher fluence/pulse number combinations. Melting was observed in naturally aged silk cleaned with 64 pulses at 4.2 J cm?2. The temperature reached at 0.1 J cm?2 is sufficient to evaporate carbon. Excess energy is transferred into the silk substrate causing thermal degradation. Different chemical processes leading to chain scission and to crosslinking seem to occur simultaneously, even at low fluence and pulse number. An increase in pulse numbers also leads to increasing damage.",
    author = "{von Lerber}, Karin and Matija Strlic and Jana Kolar and J{\"o}rg Kr{\"u}ger and Simone Pentzien and Kennedy, {Craig J} and Wess, {Timothy J} and Marina Sokhan and Wolfgang Kautek",
    year = "2007",
    doi = "10.1007/978-3-540-72130-7_36",
    language = "English",
    isbn = "9783540721291",
    series = "Springer Proceedings in Physics",
    publisher = "Springer",
    pages = "313--320",
    editor = "Nimmrichter, {Mag Johann} and Wolfgang Kautek and Manfred Schreiner",
    booktitle = "Lasers in the Conservation of Artworks",

    }

    von Lerber, K, Strlic, M, Kolar, J, Krüger, J, Pentzien, S, Kennedy, CJ, Wess, TJ, Sokhan, M & Kautek, W 2007, Laser cleaning of undyed silk: indications of chemical change. in MJ Nimmrichter, W Kautek & M Schreiner (eds), Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. Springer Proceedings in Physics, vol. 116, Springer, pp. 313-320, Lasers in the Conservation of Artworks, Vienna, Austria, 21/09/05. https://doi.org/10.1007/978-3-540-72130-7_36

    Laser cleaning of undyed silk: indications of chemical change. / von Lerber, Karin; Strlic, Matija; Kolar, Jana; Krüger, Jörg ; Pentzien, Simone ; Kennedy, Craig J; Wess, Timothy J; Sokhan, Marina ; Kautek, Wolfgang.

    Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. ed. / Mag Johann Nimmrichter; Wolfgang Kautek; Manfred Schreiner. Springer, 2007. p. 313-320 (Springer Proceedings in Physics; Vol. 116).

    Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

    TY - CHAP

    T1 - Laser cleaning of undyed silk: indications of chemical change

    AU - von Lerber, Karin

    AU - Strlic, Matija

    AU - Kolar, Jana

    AU - Krüger, Jörg

    AU - Pentzien, Simone

    AU - Kennedy, Craig J

    AU - Wess, Timothy J

    AU - Sokhan, Marina

    AU - Kautek, Wolfgang

    PY - 2007

    Y1 - 2007

    N2 - Three different undyed, unweighed silk fabrics (new clean, new soiled, and naturally aged) were cleaned with a computer-controlled Q-switched Nd:YAG laser at 532nm in 30 combinations of fluence and pulse numbers. They were studied for chemical change by viscometry, X-ray diffraction, and FIB-SIMS in combination with temperature calculations. While physical changes only occurred above the tested parameters, chemical changes could be detected as low as 0.2 J cm?2 with four pulses. Yellowing was observed at lower and bleaching at higher fluence/pulse number combinations. Melting was observed in naturally aged silk cleaned with 64 pulses at 4.2 J cm?2. The temperature reached at 0.1 J cm?2 is sufficient to evaporate carbon. Excess energy is transferred into the silk substrate causing thermal degradation. Different chemical processes leading to chain scission and to crosslinking seem to occur simultaneously, even at low fluence and pulse number. An increase in pulse numbers also leads to increasing damage.

    AB - Three different undyed, unweighed silk fabrics (new clean, new soiled, and naturally aged) were cleaned with a computer-controlled Q-switched Nd:YAG laser at 532nm in 30 combinations of fluence and pulse numbers. They were studied for chemical change by viscometry, X-ray diffraction, and FIB-SIMS in combination with temperature calculations. While physical changes only occurred above the tested parameters, chemical changes could be detected as low as 0.2 J cm?2 with four pulses. Yellowing was observed at lower and bleaching at higher fluence/pulse number combinations. Melting was observed in naturally aged silk cleaned with 64 pulses at 4.2 J cm?2. The temperature reached at 0.1 J cm?2 is sufficient to evaporate carbon. Excess energy is transferred into the silk substrate causing thermal degradation. Different chemical processes leading to chain scission and to crosslinking seem to occur simultaneously, even at low fluence and pulse number. An increase in pulse numbers also leads to increasing damage.

    U2 - 10.1007/978-3-540-72130-7_36

    DO - 10.1007/978-3-540-72130-7_36

    M3 - Chapter (peer-reviewed)

    SN - 9783540721291

    T3 - Springer Proceedings in Physics

    SP - 313

    EP - 320

    BT - Lasers in the Conservation of Artworks

    A2 - Nimmrichter, Mag Johann

    A2 - Kautek, Wolfgang

    A2 - Schreiner, Manfred

    PB - Springer

    ER -

    von Lerber K, Strlic M, Kolar J, Krüger J, Pentzien S, Kennedy CJ et al. Laser cleaning of undyed silk: indications of chemical change. In Nimmrichter MJ, Kautek W, Schreiner M, editors, Lasers in the Conservation of Artworks: LACONA VI Proceedings, Vienna, Austria, Sept. 21-25, 2005. Springer. 2007. p. 313-320. (Springer Proceedings in Physics). https://doi.org/10.1007/978-3-540-72130-7_36