4.6 Article

From Convective Assembly to Landau-Levich Deposition of Multilayered Phospholipid Films of Controlled Thickness

期刊

LANGMUIR
卷 25, 期 5, 页码 2554-2557

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AMER CHEMICAL SOC
DOI: 10.1021/la803646e

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  1. Japan Science and Technology Agency
  2. Centre National de la Recherche Scientifique (CNRS)
  3. European Commission [CP-FP214566-2]
  4. EADS Foundation

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In this letter, we describe a method to control the organization and thickness of multilayered phospholipid films. The meniscus of an organic solution of phospholipid molecules was dragged at a speed v on a solid substrate under controlled temperature and forced convection, leading to the deposition of a dried multilayered phospholipid film with a thickness h in the range of 20-200 nm. We found two distinct regimes dominating the film deposition. At low speeds, phospholipid molecules accumulate near the contact line and form a dry film behind the meniscus (evaporation regime). At high speed, viscous forces become predominant and pull out a liquid film that will dry afterward (Landau-Levich regime). Both regimes show robust scaling h proportional to v(alpha) with alpha = -1.1 and 0.76, respectively. Although these regimes have been observed separately in the past, they have not been demonstrated in the same material system. Moreover, we present models whose scalings (alpha = -1 and 2/3) are in close agreement with the observed values. The microscale organization of the resulting film is independent of v for a given regime but differs from one regime to another. In the Landau-Levich regime, h is very homogeneous on the microscale with discrete variations of +/- 5 nm, that is, the thickness of one bilayer.

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