Annular cracks of thin films of colloidal silica particles coating a fiber (bibtex)
by , ,
Abstract:
We report an experimental study of the crack pattern formed during the drying of a colloidal suspension. A horizontal fiber, which provides a one dimensional, boundary-free substrate, is coated by a film of micronic thickness. The geometry imposes a remarkable annular crack pattern and allowing precise measurements of the crack spacing over a short range of film thickness (between 2 and 10 $\mu$m) which varies linearly with the film height. We compare our experimental data with a model proposed by Kitsunezaki which suggests that the variation of the crack spacing with the film thickness depends on the ratio between a critical stress at cracking and a critical stress for slipping on the substrate. By measuring the friction force of the colloidal gels on a hydrophobic surface through a cantilever technique, we can deduce the critical crack stress for these colloidal gels simply by measuring the crack spacing of the pattern.
Reference:
F. Boulogne, L. Pauchard and F. Giorgiutti-Dauphiné, "Annular cracks of thin films of colloidal silica particles coating a fiber", EPL, vol. 102, no. 3, 2013, pp. 39002.
Bibtex Entry:
@Article{Boulogne2013b,
    Title                    = {Annular cracks of thin films of colloidal silica particles coating a fiber},
    Author                   = {Boulogne, F. and Pauchard, L. and Giorgiutti-Dauphin\'{e}, F.},
    Journal                  = {EPL},
    Year                     = {2013},
    Number                   = {3},
    Pages                    = {39002},
    Volume                   = {102},
    Abstract                 = {We report an experimental study of the crack pattern formed during the drying of a colloidal suspension. A horizontal fiber, which provides a one dimensional, boundary-free substrate, is coated by a film of micronic thickness. The geometry imposes a remarkable annular crack pattern and allowing precise measurements of the crack spacing over a short range of film thickness (between 2 and 10 $\mu$m) which varies linearly with the film height. We compare our experimental data with a model proposed by Kitsunezaki which suggests that the variation of the crack spacing with the film thickness depends on the ratio between a critical stress at cracking and a critical stress for slipping on the substrate. By measuring the friction force of the colloidal gels on a hydrophobic surface through a cantilever technique, we can deduce the critical crack stress for these colloidal gels simply by measuring the crack spacing of the pattern.},
    Arxiv                    = {1305.4471},
    hal                      = {01873307},
    DOI                      = {10.1209/0295-5075/102/39002},
    Keywords                 = {cracks}
}
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