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8 Sep 2008

Volume 93, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 93, 101905 (2008); http://dx.doi.org/10.1063/1.2977760 (3 pages)

Mei Wang, Yinwei Li, Tian Cui, Yanming Ma, and Guangtian Zou
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Detaching speed of a fibrillar interface

B. Chen, P. D. Wu, and Y. Huang

Appl. Phys. Lett. 93, 103901 (2008); http://dx.doi.org/10.1063/1.2981208 (3 pages)

Online Publication Date: 9 September 2008

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Considering elastic energy stored in the fibrillar structure recoverable, we provide different initial and dynamic fracture toughnesses for a fibrillar interface to reconcile the contradiction existing in literature. A theory on the speed of a semi-infinite crack propagating along a fibrillar interface is then developed, which is used to estimate the speed of gecko toe detachment. The predicted time interval for gecko toe detachment is less than a few milliseconds.
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89.20.Kk Engineering

Noise analysis and sensitivity enhancement in immunomagnetic nanomechanical biosensors

Kutay Icoz, Brian D. Iverson, and Cagri Savran

Appl. Phys. Lett. 93, 103902 (2008); http://dx.doi.org/10.1063/1.2980036 (3 pages) | Cited 1 time

Online Publication Date: 11 September 2008

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We report noise and detection limitations in cantilever-based immunomagnetic biosensors. A differential cantilever system with sensing and control arms was used whereby the control arm was passivated with bovine serum albumin (BSA) and the sensing arm was functionalized with biotin-BSA. Streptavidin-coated magnetic beads were exposed to cantilever arms. An oscillatory magnetic field induced a magnetic force on the beads which caused a relative deflection of the sensing arm. Increasing the excitation frequency suppressed the 1/f noise by 100-fold, resulting in a deflection resolution of 0.065 Å in air.
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87.85.Rs Nanotechnologies-applications
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
87.14.E- Proteins
87.15.N- Properties of solutions of macromolecules

DNA molecules resolved by electrical double layer force spectroscopy imaging

J. Sotres and A. M. Baró

Appl. Phys. Lett. 93, 103903 (2008); http://dx.doi.org/10.1063/1.2981688 (3 pages) | Cited 3 times

Online Publication Date: 11 September 2008

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This paper deals with spatially resolved force spectroscopy applied to the imaging of the electrical double layer (EDL) force. It is focused on an important point that has not been elucidated yet, the resolution that can be achieved. For this purpose, single plasmid DNA molecules have been studied with an atomic force microscope operated in the force spectroscopy imaging mode. With this approach, important quantities deduced from the force spectra can be simultaneously mapped along with the topography image. Single DNA molecules have been probed obtaining a lateral resolution in the EDL force similar to that of the topography.
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87.14.gk DNA
82.37.Gk STM and AFM manipulations of a single molecule
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