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Review of Scientific Instruments / Volume 82 / Issue 9 / ARTICLES / Electronics; Electromagnetic Technology; Microwaves

Rev. Sci. Instrum. 82, 094702 (2011); http://dx.doi.org/10.1063/1.3627410 (8 pages)

Interface shear microrheometer with an optically driven oscillating probe particle

Chang Young Park1, H. Daniel Ou-Yang2, and Mahn Won Kim1

1Department of Physics, KAIST, Daejeon 305-701, South Korea
2Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA

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(Received 20 March 2011; accepted 3 August 2011; published online 16 September 2011)

We report the first experimental demonstration of an active interfacial shear microrheometer (ISMR) that uses a particle trapped by oscillating optical tweezers (OT) to probe the shear modulus Gs*(ω) of a gas/liquid interface. The most significant advantages of the oscillating OT in a rheology study are: (1) very high sensitivity compared to other active microrheology methods and (2) the ability to measure both the real and imaginary components of the complex shear modulus without relying on the use of Kramers-Kronig relation, which can be problematic at low frequencies for most of the passive methods. We demonstrate the utilities of our ISMR in two case studies: (1) a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine monolayer and (2) a composite of poly(styrene sulfonate) and dioctadecyldimethylammonium at the air/water interface in regimes where no other active instruments can explore.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. OPTICAL TWEEZER WITH A FEEDBACK SYSTEM
    1. Detection of an optically trapped particle
    2. The spring constant kOT by the distance d z
  3. THEORY
    1. Shear modulus without a storage modulus
    2. Shear modulus with a storage modulus
  4. EXPERIMENTAL RESULTS AND DISCUSSION
    1. Example 1: Lipid monolayer
    2. Example 2: Composite of a polyelectrolyte/lipid at the air/water interface
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

monolayers, polymers, radiation pressure, rheology, shear modulus

PACS

  • 83.85.Cg

    Rheological measurements—rheometry

  • 83.85.Ei

    Optical methods; rheo-optics

  • 68.18.Fg

    Liquid thin film structure: measurements and simulations

  • 47.57.Qk

    Rheological aspects

  • 68.35.Gy

    Mechanical properties; surface strains

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3627410

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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