Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-09-02
Phys. Rev. Lett. vol 97, 109601 (2006)
Physics
Condensed Matter
Soft Condensed Matter
to appear in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.97.109601
In a recent Letter (Phys. Rev. Lett. vol 96, 066001 (2006), ref [1]), Choi and Kim reported slip lengths of a few tens of microns for water on nanoengineered superhydrophobic surfaces, on the basis of rheometry (cone-and-plate) measurements. We show that the experimental uncertainty in the experiment of Ref. [1], expressed in term of slip lengths, lies in the range 20 - 100 micrometers, which is precisely the order of magnitude of the reported slip lengths. Moreover we point out a systematic bias expected on the superhydrophobic surfaces. We thus infer that it is not possible to draw out any conclusion concerning the existence of huge slip lengths in the system studied by Choi and Kim.
Bocquet Lyderic
Manneville Sebastien
Tabeling Patrick
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