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Issue 4, 2011
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Controlled mechanical fracture for fabricating microchannels with various size gradients

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Abstract

We present a simple method to generate cracks with controllable size (depth and width) and space gradients using deep surface oxidation and anisotropic mechanical stretching. To generate a thick oxidation layer (<∼7 µm), a polydimethylsiloxane (PDMS) slab of uniform or varying thickness was exposed to UV/ozone for less than 30 min in the UV-C wavelength including wavelengths of 185 and 254 nm. Subsequently, the PDMS slab was wrapped on a cylindrical support (radius: 11 mm) to apply a uniform bending strain (<21%), resulting in equally separated, anisotropic cracks over a large area. By modulating initial oxidation depth and applied bending stress, cracks of varying sizes and spaces were formed on a single PDMS slab. Furthermore, multiple, sequential cracks were generated by increasing the strain in a step-wise fashion and multi-directional cracks by applying the strain with an orientation angle. Finally, size and space-varying cracks were formed between two adjacent large channels in an interconnected format by selective masking and irreversible bonding.

Graphical abstract: Controlled mechanical fracture for fabricating microchannels with various size gradients

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Publication details

The article was received on 05 Aug 2010, accepted on 15 Oct 2010 and first published on 19 Nov 2010


Article type: Technical Note
DOI: 10.1039/C0LC00277A
Citation: Lab Chip, 2011,11, 717-722
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    Controlled mechanical fracture for fabricating microchannels with various size gradients

    H. Kim, S. Lee and K. Suh, Lab Chip, 2011, 11, 717
    DOI: 10.1039/C0LC00277A

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