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Model for biological communication in a nanofabricated cell-mimic driven by stochastic resonance

Nano Communication Networks 2011年第1期2卷 39-49页

作者： Karig, David K. Siuti, Piro Dar, Roy D. Retterer, Scott T. Doktycz, Mitchel J. Simpson, Michael L. Center for Nanophase Materials Sciences Oak Ridge National Laboratory Bethel Valley Road Oak Ridge TN 37831 United States Biosciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 United States Graduate Program in Genome Science and Technology University of Tennessee Knoxville TN 37996 United States Department of Physics and Astronomy University of Tennessee Knoxville TN 37996-2010 United States Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996-2010 United States Center for Environmental Biotechnology University of Tennessee Knoxville TN 37996-2010 United States

Cells offer natural examples of highly efficient networks of nanomachines. Accordingly, both intracellular and intercellular communication mechanisms in nature are looked to as a source of inspiration and instruction for engineered nanocommunication. Harnessing biological functionality in this manner requires an interdisciplinary approach that integrates systems biology, synthetic biology, and nanofabrication. Here, we present a model system that exemplifies the synergism between these realms of research. We propose a synthetic gene network for operation in a nanofabricated cell mimic array that propagates a biomolecular signal over long distances using the phenomenon of stochastic resonance. Our system consists of a bacterial quorum sensing signal molecule, a bistable genetic switch triggered by this signal, and an array of nanofabricated cell mimic wells that contain the genetic system. An optimal level of noise in the system helps to propagate a time-varying AHL signal over long distances through the array of mimics. This noise level is determined both by the system volume and by the parameters of the genetic network. Our proposed genetically driven stochastic resonance system serves as a testbed for exploring the potential harnessing of gene expression noise to aid in the transmission of a time-varying molecular signal. © 2011.

关键词： Gene expression

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Piezoelectric materials: All‐Solution‐Processed Flexible Thin Film Piezoelectric Nanogenerator (Adv. Mater. 45/2012)

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Advanced materials 2012年第45期24卷

作者： Sung Yun Chung Sunyoung Kim Ju‐Hyuck Lee Kyongjun Kim Sang‐Woo Kim Chong‐Yun Kang Seok‐Jin Yoon Youn Sang Kim Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Seoul 151‐744 Republic of Korea SKKU Advanced Institute of Nanotechnology School of Advanced Materials Science and Engineering Sungkyunkwan University (SKKU) Suwon 440‐746 Republic of Korea Electronic Materials Center Korea Institute of Science and Technology Seoul 136‐791 Republic of Korea Advanced Institutes of Convergence Technology 864‐1 Iui‐dong Yeongtong‐gu Suwon‐si Gyeonggi‐do 443‐270 Republic of Korea

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Development of continuous wrapping tantalum barriers for internal-tin Nb3Sn multi-filamentary wires

Development of continuous wrapping tantalum barriers for int...

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2011 International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2011

作者： Chen, Wu Ming Yavuz, Mustafa Fu, Xue Kui Kambe, Shiro McIntyre, Peter Jin, Jian Xun School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia Waterloo Institute for Nanotechnology University of Waterloo Waterloo ON N2L 3G1 Canada Cankaya University Ankara Turkey Human Sensing Program Graduate School of Science and Engineering Yamagata University 4-3-16 Johnan Yonezawa 992-8510 Japan Department of Physics Texas A and M University TX United States Center of Applied Superconductivity and Electrical Engineering University of Electronic Science and Technology of China China

ISBN: (纸本)9781424478521

A process, continuous wrapping tantalum barrier, has been developed and investigated in order to reduce the manufacturing cost. By avoiding inserting expensive tantalum tube, a long sheet barrier was directly used to wrap a prior restack. In this work, a tantalum barrier with 20 % overlap was wrapped onto sub-elements. Then 18-filament Nb3Sn plus 1 copper core restack billet was successfully drawn down and extruded into round wire as thin as a diameter of 0.84 mm. The longitudinal and cross-sectional images revealed most of barriers were continuous and intact. However, further experiments are needed to optimize the process in order to keep the all barriers continuous and intact after manufacturing. © 2011 IEEE.

关键词： Tin alloys

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Structure and magnetic properties characterization of electrodeposited Co37Fe63 alloys containing oxygen for magnetic recording applications

Structure and magnetic properties characterization of electr...

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作者： Elhalawaty, S. Carpenter, R.W. George, J. Brankovic, S.R. Materials Science and Engineering Graduate Program School for Engineering of Matter Transport and Energy Arizona State University 85287-6106 United States LeRoy Eyring Center for Solid State Science Arizona State University AZ 85287-9506 United States Center for Nanomagnetic Systems University of Houston TX 77204-4005 United States Electrical and Computer Engineering Department University of Houston TX 77204-4005 United States

ISBN: (纸本)9781118029473

Soft and high magnetic moment Co37Fe63 films were electro-deposited with variable additives on Cu/Ti/Si substrates. The correlation between structure and magnetic properties has been investigated. TEM showed the crystal structure of the films to be BCC with a 〈111〉 texture, and a grain size in the range of 10-20 nm. Oxygen in the deposited films has been identified by EDS and EELS using HAADF STEM. SIMS analysis revealed the presence of hydrogen and oxygen in the deposited CoFe films. Electron microscopy results showed that the oxygen was mainly distributed along the grain boundaries in the CoFe film. In regions where oxygen was present in the films, the Fe content was enhanced relative to Co. The magnetic properties of the deposits have been measured by Vibrating Sample Magnetometer (VSM), quantifying the impact of incorporated oxygen in the film on the saturation magnetization and the coercivity.

关键词： Magnetic properties

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Phosphors as sensors for radiation-induced displacement damage

Phosphors as sensors for radiation-induced displacement dama...

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Future of Instrumentation International Workshop (FIIW)

作者： S.L. Gollub S. Weeden-Wright D.G. Walker Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Electrical and Computer Engineering Vanderbilt University Nashville TN USA Mechanical Engineering Vanderbilt University Nashville TN USA

Because of their luminescent properties, phosphors make excellent candidates for radiation detectors. The materials are inclined to luminesce when exposed to a variety of radiation sources including gammas, protons, alphas and so forth. However, the vast majority of research and use of phosphors as radiation sensors are as scintillators-when luminescence spontaneously occurs due to the incident radiation. In this case, incident radiation promotes electrons to excited levels. The excited electrons subsequently decay to produce photons that can be detected. The luminescence is therefore a result of ionizing radiation.

关键词： materials Phosphors Radiation effects Particle beams Photoluminescence Protons Lattices

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Optimization of defect hole placement in resonant cavities

Optimization of defect hole placement in resonant cavities

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作者： Kang, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM T.J. Watson Research Center Yorktown Heights NY 10536 United States

We demonstrate the resonance wavelength and quality factor dependence of 50nm defect-hole placement within photonic crystal L3 microcavities. Proper placement of defect-holes leads to a 12% increase in photonic crysta... 详细信息

ISBN: (纸本)9781557529107

关键词： Photonic crystals

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Optimization of defect hole placement in resonant cavities

Optimization of defect hole placement in resonant cavities

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Conference on Lasers and Electro-Optics (CLEO)

作者： Christopher Kang Sharon M. Weiss Yurii A. Vlasov Solomon Assefa Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University USA IBM T.J Watson Research Center Yorktown Heights NY USA

ISBN: (纸本)9781557529107

关键词： Cavity resonators Lattices Photonic crystals Optical waveguides Sensitivity Slabs Q factor

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Development of Avrami's kinetics to describe growth of Bi-2223 crystals

Development of Avrami's kinetics to describe growth of Bi-22...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Wu Ming Chen Xu Chuan Jiang Mustafa Yavuz Shiro Kambe School of Materials Science and Engineering University of New South Wales Sydney NSW Australia Waterloo Institute for Nanotechnology University of Waterloo Waterloo ONT Canada Cankaya University Ankara Turkey Human Sensing Program Graduate School of Science and Engineering Yamagata University Yonezawa Japan

The Avrami's kinetics was known to be the best theory to describe Bi-2223 crystals growth. Whereas, it cannot explain the fact that maximum product volume appearing at optimum sintering time during synthesis Bi-2223 crystal. Meanwhile, the Avrami's equation can also be used to determine the activation energy of Bi-2223 crystal growth; unfortunately, the determined activation energy, E, had dispersion as much as hard to be accepted by researchers themselves. To solve those problems, we studied and developed Avrami's kinetics and obtained a developed Avrami's kinetics equation in this research. With the developed Avrami equation, the index of growth, n, and E of Bi-2223 crystals were determined, including the periods of Bi-2223 crystals growing and decomposing. The n and E for Bi-2223 crystals were changing during synthesis period, values of which can be positive, zero or negative for different reaction periods. And the negative E and n were no reports to be found before, which caused by the decomposition of the product. The developed kinetics can describe a phase transformation system that with metastable or stable product. The developed kinetics theory, as a universal theoretical tool, is expected to be widely applied in the science and engineering multidisciplines and their related interdisciplines.

关键词： Crystals Kinetic theory Equations Mathematical model Educational institutions High temperature superconductors Australia

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Dynamics and stability of divacancy defects in graphene

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Physical Review B 2011年第7期84卷 075445-075445页

作者： Youngkuk Kim Jisoon Ihm Euijoon Yoon Gun-Do Lee Department of Physics and Astronomy Seoul National University Seoul 151-747 Republic of Korea Department of Materials Science and Engineering Seoul National University Seoul 151-742 Republic of Korea Department of Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon 433-270 Republic of Korea Department of Materials Science and Engineering WCU Hybrid Materials Program Seoul National University Seoul 151-742 Republic of Korea Energy Semiconductor Research Center Advanced Institutes of Convergence Technology Seoul National University Suwon 443-270 Korea

A divacancy (DV) is one of the most abundant and most important defects in irradiated graphene, which modifies electronic and chemical properties of graphene. In this paper, we present ab initio calculations to study the dynamics and stability of DVs in graphene. Divacancies in graphene have various reconstructed structures, such as triple pentagon-triple heptagon (555-777) and pentagon-octagon-pentagon (5-8-5) patterns. A direct observation of the structural transformations between these reconstructions was recorded in transmission electron microscope images reported by Girit et al. in science 323, 1705 (2009). We clarify the atomic structures of DVs observed in the experiment and investigate the atomic processes and energetics for the observed dynamical motions in great detail. It is found that a series of Stone–Wales-type transformations are responsible for the migration and structural transformations of DVs and that a pentagon-heptagon-heptagon-pentagon (5-7-7-5) defect appearing as an intermediate structure during the dynamical process plays an important role in the transformations of DVs.

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Phonon transport and thermoelectricity in defect-engineered InAs nanowires

Phonon transport and thermoelectricity in defect-engineered ...

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2011 MRS Fall Meeting

作者： Weathers, Annie Moore, Arden L. Pettes, Michael T. Salta, Daniel Kim, Jaehyun Dick, Kimberly Samuelson, Lars Linke, Heiner Caroff, Philippe Shi, Li Department of Mechanical Engineering University of Texas at Austin Austin TX United States Material Science and Engineering Graduate Program University of Texas at Austin Austin TX United States Center for Nano and Molecular Science University of Texas at Austin Austin TX United States Division of Solid State Physics Lund University S-22100 Lund Sweden Polymer and Materials Chemistry Lund University S-22100 Lund Sweden Institut d'Electronique de Microelectronique et de Nanotechnologie UMR CNRS 8520 F-59652 Villeneuve d'Ascq France

ISBN: (纸本)9781627482219

There have been reports of improvements in the thermoelectric figure of merit through the use of nanostructured materials to suppress the lattice thermal conductivity. Here, we report on a fundamental study of the combined effects of defect planes and surface scattering on phonon transport and thermoelectric properties of defect-engineered InAs nanowires. A microfabricated device is employed to measure the thermal conductivity and thermopower of individual suspended indium arsenide nanowires grown by metal organic vapor phase epitaxy. The four-probe measurement device consists of platinum resistance thermometers and electrodes patterned on two adjacent SiNx membranes. A nanowire was suspended between the two membranes, and electrical contact between the nanowire and the platinum electrodes was made with the evaporation of a Ni/Pd film through a shadow mask. The exposed back side of the device substrate allows for characterization of the crystal structure of the suspended nanowire with transmission electron microscopy (TEM) following measurement. The 100-200 nm diameter zincblende (ZB) InAs nanowire samples were grown with randomly spaced twin defects, stacking faults, or phases boundaries perpendicular to the nanowire growth direction, as revealed by transmission electron microscopy (TEM) analysis. Compared to single-crystal ZB InAs nanowires with a similar lateral dimension, the thermal conductivity of the defect-engineered nanowires is reduced by fifty percent at room temperature. © 2012 materials Research Society.

关键词： Nanowires

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