Elastic Properties of 2D Colloidal Crystals from Video Microscopy

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2003
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Zahn, Klaus
Wille, Axel
Sengupta, Surajit
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Zusammenfassung

Elastic constants of two-dimensional (2D) colloidal crystals are determined by measuring strain fluctuations induced by Brownian motion of particles. Paramagnetic colloids confined to an air-water interface of a pendant drop are crystallized under the action of a magnetic field, which is applied perpendicular to the 2D layer. Using video microscopy and digital image processing we measure fluctuations of the microscopic strain obtained from random displacements of the colloidal particles from their mean (reference) positions. From these we calculate system-size dependent elastic constants, which are extrapolated using finite-size scaling to obtain their values in the thermodynamic limit. The data are found to agree rather well with zero-temperature calculations.

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ISO 690ZAHN, Klaus, Axel WILLE, Georg MARET, Surajit SENGUPTA, Peter NIELABA, 2003. Elastic Properties of 2D Colloidal Crystals from Video Microscopy. In: Physical Review Letters. 2003, 90(15). ISSN 0031-9007. Available under: doi: 10.1103/PhysRevLett.90.155506
BibTex
@article{Zahn2003Elast-17326,
  year={2003},
  doi={10.1103/PhysRevLett.90.155506},
  title={Elastic Properties of 2D Colloidal Crystals from Video Microscopy},
  number={15},
  volume={90},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Zahn, Klaus and Wille, Axel and Maret, Georg and Sengupta, Surajit and Nielaba, Peter}
}
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