July 2009 Volume 8 Number 7, pp 535 - 609
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EDITORIAL
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VALUE FOR MONEY p535
2009 is turning out to be an interesting year for research funding in the
UK. Everyone wants the best science to be funded, but it's not clear that
the proposed policy changes will achieve this.
doi:10.1038/nmat2485
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RESEARCH HIGHLIGHTS
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OUR CHOICE FROM THE RECENT LITERATURE p536
doi:10.1038/nmat2484
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NEWS AND VIEWS
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METAMATERIALS: TOWARDS INVISIBILITY IN THE VISIBLE pp537 - 538
Ever since invisibility cloaking has left the realm of fiction and been
demonstrated for microwave radiation, cloaking in the visible has been
the aim. Having reached the near-infrared, we might be there soon.
Ulf Leonhardt
doi:10.1038/nmat2472
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ORGANIC CONDUCTORS: POLYMERS AS ONE-DIMENSIONAL METALS pp538 - 539
Bulk polycrystalline organic conductors do not behave like two- or
three-dimensional materials but as one-dimensional metals.
Alessandro Troisi
doi:10.1038/nmat2482
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DNA NANOTECHNOLOGY: HOT AND STICKY OR COLD AND ALOOF pp539 - 540
DNA provides more than lock-and-key control of assembly. Careful
engineering of hairpins and loops provides the means to control the
kinetics of particle assembly, allowing structures to be 'glued' together
by heating.
Vincent M. Rotello
doi:10.1038/nmat2483
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NANOCONTACTS: THE IMPORTANCE OF BEING ENTANGLED pp541 - 542
A renormalization group study of electric transport in nanocontacts
reveals the importance of quantum correlations for achieving a startling
ferromagnetic Kondo effect.
Gerardo Ortiz
doi:10.1038/nmat2481
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MATERIAL WITNESS: DREAM ON p542
Philip Ball
doi:10.1038/nmat2480
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REVIEW
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UNDERSTANDING BIOPHYSICOCHEMICAL INTERACTIONS AT THE NANO-BIO INTERFACE
pp543 - 557
Andre E. Nel et al.
doi:10.1038/nmat2442
Abstract: http://links.ealert.nature.com/ctt?kn=4&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=91&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
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LETTERS
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COMPOSITE DOMAIN WALLS IN A MULTIFERROIC PEROVSKITE FERRITE pp558 - 562
In multiferroics ferroelectricity and magnetism are coupled, but the
coupling is often rather weak. As is now shown for a perovskite oxide,
composite domain walls can lead to a strong coupling of electricity and
magnetism, highlighting the importance of domain walls for practical
applications using multiferroics.
Yusuke Tokunaga et al.
doi:10.1038/nmat2469
Abstract: http://links.ealert.nature.com/ctt?kn=89&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=49&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
KONDO CONDUCTANCE IN AN ATOMIC NANOCONTACT FROM FIRST PRINCIPLES
pp563 - 567
A route connecting density functional theory and the numerical
renormalization group method represents the first approach to studying
atomic contacts-including magnetic elements-at an atomic level. When
applied to the case of a nickel impurity in a gold nanowire, the strategy
provides a clear connection between the geometry and the transport
properties.
Procolo Lucignano et al.
doi:10.1038/nmat2476
Abstract: http://links.ealert.nature.com/ctt?kn=13&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=25&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
AN OPTICAL CLOAK MADE OF DIELECTRICS pp568 - 571
Previous demonstrations of cloaking, where objects are rendered invisible
at certain frequencies, have been limited to the microwave regime. Moving
us a significant step closer to invisibility in a region that can been
seen by humans, a cloaking device has now been demonstrated for a broad
range of frequencies in the near-infrared.
Jason Valentine et al.
doi:10.1038/nmat2461
Abstract: http://links.ealert.nature.com/ctt?kn=65&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
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NONLINEAR TRANSPORT IN SEMICONDUCTING POLYMERS AT HIGH CARRIER DENSITIES
pp572 - 575
To use conducting and semiconducting polymers for electronic applications,
their fundamental properties need to be understood. It is now demonstrated
that the transport mechanism of
poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) at high
carrier densities in field-effect transmitters and electrochemically
doped films match those of a one-dimensional metal.
Jonathan D. Yuen et al.
doi:10.1038/nmat2470
Abstract: http://links.ealert.nature.com/ctt?kn=90&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
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STEP-BY-STEP ROTATION OF A MOLECULE-GEAR MOUNTED ON AN ATOMIC-SCALE AXIS
pp576 - 579
Designing and building molecular machines at the nanometre scale is a
conceptual and synthetic challenge. Rotation of a single molecule has
been observed but controlling the direction of the rotation has so far
proved difficult. The step-by-step rotation of a molecular gear mounted
on an atomic-scale axis is now controlled by a scanning tunnelling
microscope.
C. Manzano et al.
doi:10.1038/nmat2467
Abstract: http://links.ealert.nature.com/ctt?kn=99&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=85&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
ALKALI METAL CRYSTALLINE POLYMER ELECTROLYTES pp580 - 584
The transport and mechanical properties of polymer electrolytes make them
important materials for all-solid-state electrochemical devices such as
batteries or electrochromic displays. Crystalline polymer electrolytes
containing alkali metal salts are now found to exhibit ionic conductivity
1.5 orders of magnitude higher than the best conductor reported so far.
Chuhong Zhang et al.
doi:10.1038/nmat2474
Abstract: http://links.ealert.nature.com/ctt?kn=82&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=103&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
LOCAL ORDERING AND ELECTRONIC SIGNATURES OF SUBMONOLAYER WATER ON ANATASE
TiO2(101) pp585 - 589
The interaction of water with metal oxides is important for catalysis and
biochemistry. Charge rearrangement at the water-anastase (101) interface
affects the adsorption of further water molecules, and results in
short-range repulsive interactions and locally ordered water-molecule
superstructures.
Yunbin He et al.
doi:10.1038/nmat2466
Abstract: http://links.ealert.nature.com/ctt?kn=50&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=75&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
SWITCHABLE SELF-PROTECTED ATTRACTIONS IN DNA-FUNCTIONALIZED COLLOIDS
pp590 - 595
Functionalizing colloidal particles with DNA is a powerful tool for
guiding their assembly, using the complementary 'sticky ends' of the
molecules. However, other attributes of DNA can be used to engineer
interactions between particles more subtly. Temperature- or time-controlled
formation of loops or hairpins in DNA provides switchable connections for
novel materials from particle assemblies.
Mirjam E. Leunissen et al.
doi:10.1038/nmat2471
Abstract: http://links.ealert.nature.com/ctt?kn=12&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=22&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
RATIONAL DESIGN AND APPLICATION OF RESPONSIVE [ALPHA]-HELICAL PEPTIDE
HYDROGELS pp596 - 600
Hydrogels are hydrated polymer networks with applications in biotechnology
and medicine. When created from alpha-helical peptides with engineered
peptide sequences, their formation mechanisms can be controlled, leading
to diverse properties. For instance, those with hydrogen-bonded networks
melt on heating, but those formed through hydrophobic interactions
strengthen when warmed.
Eleanor F. Banwell et al.
doi:10.1038/nmat2479
Abstract: http://links.ealert.nature.com/ctt?kn=80&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=83&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
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ARTICLE
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INHOMOGENEOUS FLOW AND FRACTURE OF GLASSY MATERIALS pp601 - 609
The mechanisms underlying the fracture of glasses are poorly understood.
It is now shown that intrinsic density fluctuations in glass are enhanced
during the deformation process, and may therefore be the origin of fracture
in glasses. This understanding may lead to the design of glasses with
improved mechanical properties.
Akira Furukawa and Hajime Tanaka
doi:10.1038/nmat2468
Abstract: http://links.ealert.nature.com/ctt?kn=16&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
Article: http://links.ealert.nature.com/ctt?kn=24&m=33444803&r=MTc2NDk2MzQxMQS2&b=2&j=NTE4NzAyMzcS1&mt=1&rt=0
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