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17 Sep 2012

Volume 101, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 101, 123901 (2012); http://dx.doi.org/10.1063/1.4751469 (4 pages)

Chin-An Lin, K. P. Huang, S. T. Ho, Mei-Wen Huang, and Jr-Hau He
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Thermally switchable adhesions of polystyrene-block-poly(n-isopropylacrylamide) copolymer pillar array mimicking climb attitude of geckos

Jem-Kun Chen, Jing-Hong Wang, Jia-Yaw Chang, and Shih-Kang Fan

Appl. Phys. Lett. 101, 123701 (2012); http://dx.doi.org/10.1063/1.4754135 (5 pages) | Cited 1 time

Online Publication Date: 21 September 2012

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Inspired by the gecko foot pad, we fabricated polystyrene-block-poly(N-isopropylacrylamide) (PS-b-PNIPAAm) copolymer pillar array to mimic climbing attitude of a gecko, alternately attach to and detach from a surface. The pillar array structure of the PS segment significantly enhances both of the hydrophilic and hydrophobic property of PNIPAAm segment tips at 25 and 50 °C, respectively, which could generate alternating adhesive forces of approximately 120 and 11 nN. The dramatic change in adhesive and friction force difference at 25 and 50 °C may guide the design of bio-inspired artificial analogues, which could approach gecko's climbing behavior.
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68.35.Np Adhesion
81.40.Pq Friction, lubrication, and wear
82.35.Gh Polymers on surfaces; adhesion
61.41.+e Polymers, elastomers, and plastics
62.20.Qp Friction, tribology, and hardness
68.08.Bc Wetting

Probing radiation damage by alternated current conductivity as a method to characterize electron hopping conduction in DNA molecules

Paulo J. Gomes, Margarida Coelho, Madalena Dionísio, Paulo António Ribeiro, and Maria Raposo

Appl. Phys. Lett. 101, 123702 (2012); http://dx.doi.org/10.1063/1.4754287 (4 pages)

Online Publication Date: 21 September 2012

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Analysis of AC electrical conductivity of deoxyribonucleic acid (DNA) thin films, irradiated with ultraviolet (UV) light, revealed that electrical conduction arises from DNA chain electron hopping between base-pairs and phosphate groups. The hopping distance calculated from correlated barrier hopping model equals the distance between DNA base-pairs, which is consistent with the loss of conductivity with irradiation time arising from a decrease in phosphates groups. In the high frequency regime, at a given frequency, real part of conductivity strongly depends on irradiation time particularly for low dose levels suggesting the use of DNA based films for UV radiation sensors.
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87.15.M- Spectra of biomolecules
87.15.Pc Electronic and electrical properties
87.53.-j Effects of ionizing radiation on biological systems
87.14.gk DNA
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