August 2009 Volume 8 Number 8, pp 611 - 689
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With an ISI Impact Factor of 23.132*, Nature Materials is the leading
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EDITORIAL
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SCIENCE IN THE OPEN p611
As moves towards open-access schemes gain momentum, the choice between
'author pays' and subscription-based models may come down to fundamental
business considerations rather than limits in access to original research.
doi:10.1038/nmat2497
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RESEARCH HIGHLIGHTS
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RESEARCH HIGHLIGHTS p612
doi:10.1038/nmat2498
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NEWS AND VIEWS
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METAMATERIALS: A CAT'S EYE FOR ALL DIRECTIONS pp613 - 614
Metamaterials have seen many exciting applications. A design that is able
to circumvent singularities in refractive index now allows a broad range
of new applications, including an omnidirectional retroreflector.
Mark R. Dennis
doi:10.1038/nmat2500
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LIQUID CRYSTALS: PRINTED ACTUATORS IN A FLAP pp614 - 615
Solid liquid crystals couple orientational order and mechanical strain,
enabling fundamentally new mechanisms of actuation. Depositing the
materials using inkjet printing allows precise control of their shapes
and composition, producing devices with new microfluidic applications.
Peter Palffy-Muhoray
doi:10.1038/nmat2502
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IRON-BASED SUPERCONDUCTORS: VITAL CLUES FROM A BASIC COMPOUND pp615 - 616
Investigation of the phase diagram of the structurally simple compound
FeSe may prove instrumental in raising the transition temperature in
Fe-based superconductors and in understanding magnetic-mediated
superconductivity.
Bernd Buchner and Christian Hess
doi:10.1038/nmat2501
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MATERIAL WITNESS: CROSS PURPOSES p617
Philip Ball
doi:10.1038/nmat2499
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LIQUID CRYSTALS: MORE THAN DISPLAY FILLINGS pp617 - 618
With liquid-crystal displays now ubiquitous in everyday life,
liquid-crystal research is moving beyond these applications and evolving
in entirely new and unexpected directions.
Ralf Stannarius
doi:10.1038/nmat2503
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REVIEW
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IONIC-LIQUID MATERIALS FOR THE ELECTROCHEMICAL CHALLENGES OF THE
FUTURE pp621 - 629
Michel Armand et al.
doi:10.1038/nmat2448
Abstract: http://links.ealert.nature.com/ctt?kn=68&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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LETTERS
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ELECTRONIC AND MAGNETIC PHASE DIAGRAM OF [BETA]-Fe1.01Se WITH
SUPERCONDUCTIVITY AT 36.7 K UNDER PRESSURE pp630 - 633
Superconductivity was recently observed in the binary iron-based compound,
FeSe. It is now shown that under pressure, the transition temperature can
rise above 36 K. In addition, no static magnetic ordering is observed for
this system, contrary to FeAs superconductors.
S. Medvedev et al.
doi:10.1038/nmat2491
Abstract: http://links.ealert.nature.com/ctt?kn=92&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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PERIODIC ROTATION OF MAGNETIZATION IN A NON-CENTROSYMMETRIC SOFT MAGNET
INDUCED BY AN ELECTRIC FIELD pp634 - 638
The electric control of magnetism in magnetic devices has remained
problematic, particularly as energy losses due to current flow can be
large. The demonstration of electric control of magnetization in a
non-centrosymmetric insulating magnetic material therefore represents
a new strategy for future applications.
M. Saito et al.
doi:10.1038/nmat2492
Abstract: http://links.ealert.nature.com/ctt?kn=103&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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AN OMNIDIRECTIONAL RETROREFLECTOR BASED ON THE TRANSMUTATION OF DIELECTRIC
SINGULARITIES pp639 - 642
Metamaterials allow the design of new functionality through the engineered
control of light propagation, although broadband operation with these
materials requires singularities in their refractive index. As a first
example of a technique that uses a topological defect to achieve such
behaviour in a real system, an omnidirectional metamaterial retroreflector
is demonstrated.
Yun Gui Ma, C. K. Ong, Tomas Tyc and Ulf Leonhardt
doi:10.1038/nmat2489
Abstract: http://links.ealert.nature.com/ctt?kn=83&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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ENGINEERING LIGHT ABSORPTION IN SEMICONDUCTOR NANOWIRE DEVICES pp643 - 647
Quantum confinement effects have an important role in photonic devices.
However, rather than seeking perfect confinement of light, leaky-mode
resonances are shown to be ideally suited for enhancing and spectrally
engineering light absorption in nanoscale photonic structures.
Linyou Cao et al.
doi:10.1038/nmat2477
Abstract: http://links.ealert.nature.com/ctt?kn=53&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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THREE-DIMENSIONAL NANOPILLAR-ARRAY PHOTOVOLTAICS ON LOW-COST AND FLEXIBLE
SUBSTRATES pp648 - 653
Solar power is an important part of the strategy towards using more
renewable energy. The development of low-cost photovoltaic nanopillar
structures fabricated on thin aluminium substrates will contribute to
this effort, as it promises new applications for flexible, mass-produced
solar cells.
Zhiyong Fan et al.
doi:10.1038/nmat2493
Abstract: http://links.ealert.nature.com/ctt?kn=14&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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ATOMIC-SCALE IMAGING OF INDIVIDUAL DOPANT ATOMS IN A BURIED INTERFACE
pp654 - 658
Aberration-corrected microscopy can provide structural information with
atomic precision. It is now shown that even single impurity atoms in a
buried interface can be imaged, provided that a particular imaging mode
is used. This result can lead to a much clearer understanding of advanced
materials and devices that make use of the properties of interfaces.
N. Shibata et al.
doi:10.1038/nmat2486
Abstract: http://links.ealert.nature.com/ctt?kn=81&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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SEQUENTIAL CLICK REACTIONS FOR SYNTHESIZING AND PATTERNING
THREE-DIMENSIONAL CELL MICROENVIRONMENTS pp659 - 664
'Click' chemistry has been broadly exploited, but the intrinsic toxicity
of the reactions involved makes its translation to biological applications
troublesome. Copper-free click chemistry avoids the problems of toxicity,
enabling direct encapsulation of cells within click hydrogels. Tailoring
of the gels with biological functionalities is also enabled in real time
with micrometre-scale resolution.
Cole A. DeForest, Brian D. Polizzotti and Kristi S. Anseth
doi:10.1038/nmat2473
Abstract: http://links.ealert.nature.com/ctt?kn=18&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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ARTICLES
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SELECTIVE POSITIONING OF ORGANIC DYES IN A MESOPOROUS INORGANIC OXIDE
FILM pp665 - 671
Although sequential adsorption of dyes in TiO2 electrodes is ideal for
extending the range of light absorption in dye-sensitized solar cells,
high-temperature processing has so far limited its application. A method
for the selective positioning of organic dye molecules with different
absorption ranges is now reported in a mesoporous inorganic oxide film.
Kyungtae Lee et al.
doi:10.1038/nmat2475
Abstract: http://links.ealert.nature.com/ctt?kn=101&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=26&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
THE DYNAMIC ORGANIC P-N JUNCTION pp672 - 676
The light-emitting electrochemical cell (LEC) is one application of
organic semiconductors. Scanning kelvin probe microscopy and light-emission
data obtained from operational planar LECs provide insight into the
devices. The measured electrostatic potential profiles confirm that there
is in situ formation of a dynamic p-n junction in the organic
semiconductor during operation.
Piotr Matyba et al.
doi:10.1038/nmat2478
Abstract: http://links.ealert.nature.com/ctt?kn=23&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=98&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
PRINTED ARTIFICIAL CILIA FROM LIQUID-CRYSTAL NETWORK ACTUATORS MODULARLY
DRIVEN BY LIGHT pp677 - 682
The manufacture of polymeric microactuators is complicated when using
techniques like lithography, but inkjet printing can be used to deposit
self-organizing liquid-crystal networks instead. Printing sub-units with
different inks is easily scalable and creates light-driven actuators
with sections that can be individually addressed to mimic the flapping
movements of cilia.
Casper L. van Oosten, Cees W. M. Bastiaansen and Dirk J. Broer
doi:10.1038/nmat2487
Abstract: http://links.ealert.nature.com/ctt?kn=93&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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A GENERAL PHASE-TRANSFER PROTOCOL FOR METAL IONS AND ITS APPLICATION IN
NANOCRYSTAL SYNTHESIS pp683 - 689
Metal nanoparticles can be prepared with good control of particle size
and shape by solution-state chemistry, but controlling their
physicochemical properties remains a challenge. A generic protocol for
transferring metal ions from water to an organic medium is now used to
synthesize a range of metallic and semiconductor nanoparticles having
multiple functionalities.
Jun Yang and Jackie Y. Ying
doi:10.1038/nmat2490
Abstract: http://links.ealert.nature.com/ctt?kn=13&m=33706236&r=MTc2NDk2MzQxMQS2&b=2&j=NTM3OTg2MzMS1&mt=1&rt=0
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