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Träfflista för sökning "WFRF:(Engblom H) srt2:(1999)"

Sökning: WFRF:(Engblom H) > (1999)

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1.
  • Ekelund, K., et al. (författare)
  • AFM study of lipid monolayers. 1. Pressure-induced phase behavior of single and mixed fatty acids
  • 1999
  • Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 15:20, s. 6946-6949
  • Tidskriftsartikel (refereegranskat)abstract
    • Monolayers of palmitic (C16:0) and lignoceric acid (C24:0) and their equimolar mixture were transferred to a hydrophilic mica substrate at various surface pressures and investigated by means of atomic force microscopy (AFM) in contact and lateral force modes. The first-order transition of lignoceric acid gives a plateau region, representing a liquid expanded to liquid condensed phase transition in the pressure-area isotherm. This was visualized by AFM as stripes of a condensed phase within the expanded phase, exhibiting a small height difference but a significant difference in friction. The corresponding phase transition of the palmitic acid was continuous, and no changes of the Langmuir-Blodgett films with respect to pressure were observed with AFM. Both the surface pressure-area isotherms and the direct observations of domains of irregular size and shape using the AFM showed that lignoceric and palmitic acid were immiscible. The height difference between the domains was 1.1 nm corresponding to the difference in hydrocarbon chain length of the two fatty acids.
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4.
  • Sparr, E., et al. (författare)
  • AFM study of lipid monolayers. 2. Effect of cholesterol on fatty acids
  • 1999
  • Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 15:20, s. 6950-6955
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study the effect of cholesterol in Langmuir-Blodgett monolayers of fatty acids of varying chain lengths was investigated by atomic force microscopy (AFM). Domain formation due to lateral phase separation was studied at different lipid compositions and surface pressures. A small amount of cholesterol is miscible with palmitic acid (C16:0) and forms a flat monolayer while excess cholesterol forms a rougher cholesterol-rich phase. No miscibility was observed in monolayers of lignoceric acid (C24:0) and cholesterol. For the ternary mixed monolayer (palmitic acid, lignoceric acid, and cholesterol) the two fatty acids formed separate domains and the miscibility of cholesterol in the two phases showed behavior corresponding to that of the binary fatty acid-cholesterol systems. From the shape, size, and height differences of the domains one can conclude that the driving force to minimize the interfacial length between different phases is reduced in the presence of cholesterol. This can be attributed to line active properties of cholesterol.
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  • Resultat 1-4 av 4
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tidskriftsartikel (3)
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refereegranskat (3)
övrigt vetenskapligt/konstnärligt (1)
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Engblom, J (4)
Ekelund, K (3)
Sparr, E. (3)
Wennerström, H. (3)
Engström, S. (3)
Hansson, H (1)
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Gustafsson, J (1)
Ermedahl, A. (1)
Sjödin, M (1)
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Engelska (4)
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