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25 Jun 2007

Volume 90, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 90, 262501 (2007); http://dx.doi.org/10.1063/1.2752015 (3 pages)

Ian Appelbaum and Douwe J. Monsma
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Control of microfabricated structures powered by flagellated bacteria using phototaxis

Edward Steager, Chang-Beom Kim, Jigarkumar Patel, Socheth Bith, Chandan Naik, Lindsay Reber, and Min Jun Kim

Appl. Phys. Lett. 90, 263901 (2007); http://dx.doi.org/10.1063/1.2752721 (3 pages) | Cited 38 times

Online Publication Date: 27 June 2007

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Flagellated bacteria have been employed as microactuators in low Reynolds number fluidic environments. SU-8 microstructures have been fabricated and released on the surface of swarming Serratia marcescens, and the flagella propel the structures along the swarm surface. Phototactic control of these structures is demonstrated by exposing the localized regions of the swarm to ultraviolet light. The authors additionally discuss the control of microstructures in an open channel powered by bacteria which have been docked through a blotting technique. A tracking algorithm has been developed to analyze swarming patterns of the bacteria as well as the kinematics of the microstructures.
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87.17.Jj Cell locomotion, chemotaxis
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.85.Np Fluidics
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)

Direct fabrication of twisted nanofibers by electrospinning

Bon Kang Gu, Min Kyoon Shin, Ki Won Sohn, Sun I. Kim, Seon Jeong Kim, Sung-Kyoung Kim, Haiwon Lee, and Joon Shik Park

Appl. Phys. Lett. 90, 263902 (2007); http://dx.doi.org/10.1063/1.2753109 (3 pages) | Cited 9 times

Online Publication Date: 29 June 2007

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The authors have fabricated artificial twisted nanofibers that resemble naturally twisted fiber structures, such as collagen fibril and double-strand DNA, using a modified conventional electrospinning system to directly develop the twisted nanofibers. The system modification allowed for the fabrication of twisted nanofibers by controlling the whipping jet using a modified electric field from an auxiliary electrode. Moreover, the authors calculated the magnitude of the electric field strength vectors using the Maxwell software program to identify the effect of the rotating electric field on the auxiliary electrode. Twisted nanofibers have a potential application in biomimetics, such as in artificial muscles, actuators, and nanoelectromechanical systems.
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81.07.Bc Nanocrystalline materials
87.85.Qr Nanotechnologies-design
87.85.Rs Nanotechnologies-applications
87.85.J- Biomaterials
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