ISSN:
1435-1536
Keywords:
Phospholipid
;
Langmuir monolayers
;
surface rheology surface dilational elasticity
;
surface shear viscosity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The surface viscoelastic properties of monolayers of two phospholipids DPPC (L-α-dipalmitoylphosphatidylcholine) and DMPE (L-α-dimyristoylphosphatidyl-ethanolamin), at the air-water interface have been investigated. Two techniques were used for the investigation. One involved use of an interfacial shear rheometer (torsion pendulum apparatus ISR1), to provide measurements of the shear viscosity ηs as a function of surface pressure, and the second, a modified LB trough with an oscillating barrier to generate periodie dilation and compression so as to measure the dilational elastic modulusE as a function of surface area. Results indicate a strong dependence of ηs andE upon monolayer phases. This suggests that the viscoelastic relaxation of monolayers can be understood as molecular rearrangements, domain exchange and molecular reorientations between different monolayer states.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00655690
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