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20 Jul 2009

Volume 95, Issue 3, Articles (03xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 033502 (2009); http://dx.doi.org/10.1063/1.3178556 (3 pages)

Akihito Ikedo, Takahiro Kawashima, Takeshi Kawano, and Makoto Ishida
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Measurement of charge distribution in actin bundles by surface potential microscopy

Peng Zhang and Horacio F. Cantiello

Appl. Phys. Lett. 95, 033701 (2009); http://dx.doi.org/10.1063/1.3167281 (3 pages) | Cited 4 times

Online Publication Date: 21 July 2009

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Bundles of filamentous actin (F-actin) deposited on a gold-plated surface were concurrently imaged using atomic force microscopy (AFM) and surface potential microscopy (SPM). The surface potential was mapped as a function of tip distance to surface using a constant bias potential. There was an uneven spatial distribution of charges detected by SPM, consistent with the segmented topological features shown by AFM of the actin bundles. SPM analysis showed localized changes in surface potential between the axial and transversal sections of the bundles, which are consistent with nonuniform charge distributions of adsorbed salt ions on F-actin.
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87.80.-y Biophysical techniques (research methods)
87.14.E- Proteins
87.64.Dz Scanning tunneling and atomic force microscopy
87.15.B- Structure of biomolecules
87.15.Pc Electronic and electrical properties

Atomic force microscopy and thermodynamics on taro, a self-cleaning plant leaf

E. Hüger, H. Rothe, M. Frant, S. Grohmann, G. Hildebrand, and K. Liefeith

Appl. Phys. Lett. 95, 033702 (2009); http://dx.doi.org/10.1063/1.3184582 (3 pages) | Cited 1 time

Online Publication Date: 24 July 2009

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The evolution-optimized leaves of Colocasia esculenta (taro) and Nelumbo nucifera (lotus) are the best optimized self-cleaning surfaces known to date. Using an atomic force microscope device equipped with a piezodriven sample stage which enables a z-range of 100 μm we measured the surface morphology of dried and undried leaves of Colocasia esculenta. Thermodynamic calculations were done to investigate the interaction strength of a water droplet with the surfaces of the morphology shown in the images. The results show that the hierarchical structure produces a stable superhydrophobic state with optimal self-cleaning properties.
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68.08.-p Liquid-solid interfaces
68.35.B- Structure of clean surfaces (and surface reconstruction)
68.37.Ps Atomic force microscopy (AFM)
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