Active interfacial shear microrheology of aging protein films

The magnetically driven rotation of 300 nm diameter rods shows the surface viscosity of albumin at an air-water interface increases from 10(-9) to 10(-5) N s/m over 2 h while the surface pressure saturates in minutes. The increase in surface viscosity is not accompanied by a corresponding increase i...

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Bibliographic Details
Published in:Physical review letters 2010-01, Vol.104 (1), p.016001-016001, Article 016001
Main Authors: Dhar, Prajnaparamita, Cao, Yanyan, Fischer, Thomas M, Zasadzinski, J A
Format: Article
Language:English
Subjects:
Albumins - metabolism
Magnetics
Nanotubes - chemistry
Pressure
Rheology
Solutions
Stress, Mechanical
Surface Properties
Time Factors
Viscosity
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Summary:The magnetically driven rotation of 300 nm diameter rods shows the surface viscosity of albumin at an air-water interface increases from 10(-9) to 10(-5) N s/m over 2 h while the surface pressure saturates in minutes. The increase in surface viscosity is not accompanied by a corresponding increase in elasticity, suggesting that the protein film anneals with time, resulting in a more densely packed film leading to increased resistance to shear. The nanometer dimensions of the rods provide the same sensitivity as passive microrheology with an improved ability to measure more viscous films.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.104.016001