Document Detail

From Convective Assembly to Landau-Levich Deposition of Multilayered Phospholipid Films of Controlled Thickness.
MedLine Citation:
PMID:  19191555     Owner:  NLM     Status:  Publisher    
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, variant 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.
Maël Le Berre; Yong Chen; Damien Baigl
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2009-2-3
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-2-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Chemistry, Ecole Normale Superieure, 24 rue Lhomond, 75005 Paris, France.
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