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              <p>Electrohydrodynamic migration, which is based on hydrodynamic actuation with an opposing electrophoretic force, enables the separation of DNA molecules of 3–100 kbp in glass capillary within 1 h. Here, we wish to enhance these performances using microchip technologies. This study starts with the fabrication of microchips with uniform surfaces, as motivated by our observation that band splitting occurs in microchannels made out of heterogeneous materials such as glass and silicon. The resulting glass-adhesive-glass microchips feature the highest reported bonding strength of 11 MPa for such materials (115 kgf/cm2), a high lateral resolution of critical dimension 5 μm, and minimal auto-fluorescence. These devices enable us to report the separation of 13 DNA bands in the size range of 1–150 kbp in one experiment of 5 min, i.e. 13 times faster than with capillary. In turn, we observe that bands split during electrohydrodynamic migration in heterogeneous glass-silicon but not in homogeneous glass-adhesive-glass microchips. We suggest that this effect arises from differential Electro-Osmotic Flow (EOF) in between the upper and lower walls of heterogeneous channels, and provide evidence that this phenomenon of differential EOF causes band broadening in electrophoresis during microchip electrophoresis. We finally prove that our electrohydrodynamic separation compares very favorably to microchip technologies in terms of resolution length and features the broadest analytical range reported so far.</p>
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    </back>
  </text>
</TEI>