December 2008 Volume 7 Number 12, pp 923 - 1010
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EDITORIAL
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A NEW APPROACH FOR SCIENCE p923
Barack Obama's victory in the US presidential election is good news
for researchers.
doi:10.1038/nmat2322
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPT0Ea
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RESEARCH HIGHLIGHTS
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NANOPORES, NANOMOTORS, NEGATIVE REFRACTION... p925
doi:10.1038/nmat2323
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPU0Eb
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NEWS AND VIEWS
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IRON-BASED SUPERCONDUCTORS: UNITY OR DIVERSITY? pp927 - 928
Does the high-temperature superconductivity observed in the newly
discovered iron pnictides represent another example of the same
essential physics responsible for superconductivity in the cuprates,
or does it embody a new mechanism?
Steven A. Kivelson and Hong Yao
doi:10.1038/nmat2325
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPV0Ec
MATERIAL WITNESS: JUGGLING WITH LIQUIDS p928
Philip Ball
doi:10.1038/nmat2320
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPW0Ed
SUPERCONDUCTIVITY: SQUASH AND SANDWICHES pp929 - 930
Externally applied pressure induces superconductivity in the layer
compound 1T-TaS2. Similarities to, and differences from, other
superconducting systems promise exciting future experiments on this
old, but suddenly rejuvenated, compound.
Erio Tosatti
doi:10.1038/nmat2327
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPX0Ee
GLASS AND MINERAL CORROSION: DYNAMICS AND DURABILITY pp930 - 932
The durability of glasses and minerals in water has traditionally been
predicted using models that ignore the molecular details. Now the
surface structure dynamics are shown to play an integral role in their
aqueous corrosion.
William H. Casey
doi:10.1038/nmat2326
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPY0Ef
TISSUE ENGINEERING: POLYMERS FLEX THEIR MUSCLES pp932 - 933
Accordion-like honeycomb scaffolds support the formation of
anisotropically contracting heart tissue in vitro, opening up
possibilities in the area of cardiac tissue repair.
Wolfram-Hubertus Zimmermann
doi:10.1038/nmat2328
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPZ0Eg
POLYMER DYNAMICS: FLOORED BY THE RINGS pp933 - 935
The tube model can explain how mutually entangled polymer chains move
and interact, but it relies on the loose ends of chains to generate
relaxation. Ring polymers have no ends - so how do they relax?
Tom McLeish
doi:10.1038/nmat2324
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPa0En
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ERRATUM
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Let the Sun shine p935
doi:10.1038/nmat2337
http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPb0Eo
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REVIEW
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CRYSTAL STRUCTURE PREDICTION FROM FIRST PRINCIPLES pp937 - 946
Scott M. Woodley and Richard Catlow
doi:10.1038/nmat2321
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPc0Ep
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPd0Eq
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ARTICLES
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ULTRAHIGH STRESS AND STRAIN IN HIERARCHICALLY STRUCTURED HOLLOW
NANOPARTICLES pp947 - 952
Nanocrystalline materials usually exhibit high strength and their
deformation caused by stress is limited. Nanocrystalline CdS with
spherical and hierarchical shell geometry is shown not only to withstand
extreme stresses, but also to deform considerably before failure.
Z. W. Shan et al.
doi:10.1038/nmat2295
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPe0Er
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPf0Es
STRUCTURAL AND MAGNETIC PHASE DIAGRAM OF CeFeAsO1- xFx AND ITS RELATION
TO HIGH-TEMPERATURE SUPERCONDUCTIVITY pp953 - 959
According to a neutron-scattering study of the structural and magnetic
properties of the pnictide CeFeAsO1-xFx, the phase diagram of this
material shows considerable similarities with the high-Tc cuprate
superconductors. These results are an important addition to the effort
to find out where superconductivity in these iron-arsenic alloys arises.
Jun Zhao et al.
doi:10.1038/nmat2315
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPg0Et
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPh0Eu
FROM MOTT STATE TO SUPERCONDUCTIVITY IN 1T-TaS2 pp960 - 965
Superconductivity is a complex and fascinating phenomenon, made more
so by its coexistence with other collective electronic states. A study
of the layered compound 1T-TaS2 under pressure enables the various
states of the material to be investigated and compared with other
commonly studied layered superconductors.
B. Sipos et al.
doi:10.1038/nmat2318
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPi0Ev
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPj0Ew
ELECTRONIC TWO-TERMINAL BISTABLE GRAPHITIC MEMORIES pp966 - 971
Carbon-based structures are being intensively investigated for their
use in electronic devices. A pronounced non-volatile switching is now
observed in two-terminal devices made from graphitic sheets. The highly
reliable switching mechanism is explained by the local breaking and
rejoining of atomic bonds in the sheets.
Yubao Li, Alexander Sinitskii and James M. Tour
doi:10.1038/nmat2331
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPk0Ex
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPl0Ey
A MAP FOR PHASE-CHANGE MATERIALS pp972 - 977
Phase-change materials are widely used as non-volatile memories, for
example in optical data storage, but the search for improved phase-change
materials has proved difficult. Based on a fundamental understanding
of their bonding characteristics, a systematic prediction of phase-change
properties has now become possible.
Dominic Lencer et al.
doi:10.1038/nmat2330
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPm0Ez
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPn0E1
INSIGHT INTO SILICATE-GLASS CORROSION MECHANISMS pp978 - 983
Understanding the corrosion mechanism of aqueous silicate glass is
crucial for the long-term durability of nuclear waste glasses. This
mechanism is generally thought to be associated with chemical affinity,
but it is now demonstrated that morphological transformations also have
an important role in the leaching kinetics of these glasses.
Celine Cailleteau et al.
doi:10.1038/nmat2301
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPo0E2
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPp0E3
HIERARCHICAL NANOFABRICATION OF MICROPOROUS CRYSTALS WITH ORDERED
MESOPOROSITY pp984 - 991
Zeolite nanocrystals with three-dimensionally ordered mesoporous
structures are important for designing molecularly accessible and
selective catalysts. With a single zeolite synthesis procedure, uniform
nanocrystals and crystal zeolites with ordered imprinted mesoporosity
can now be obtained.
Wei Fan et al.
doi:10.1038/nmat2302
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPq0E4
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPr0E5
SINGLE-MOLECULE NANOCATALYSIS REVEALS HETEROGENEOUS REACTION PATHWAYS
AND CATALYTIC DYNAMICS pp992 - 996
Nanomaterials are effective catalysts for many chemical reactions,
however, their catalytic properties are most often determined by
ensembles of nanoparticles, and so far only averaged results have been
measured. Now, the heterogeneous reactivity and the surface structure
dynamics of individual gold nanoparticles are revealed by monitoring
single fluorogenic reactions.
Weilin Xu, Jason S. Kong, Yun-Ting E. Yeh and Peng Chen
doi:10.1038/nmat2319
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPs0E6
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPt0E7
UNEXPECTED POWER-LAW STRESS RELAXATION OF ENTANGLED RING POLYMERS
pp997 - 1002
How do entangled polymer rings relax? Linear polymers can ease their
stress because their chains have ends, but cyclic polymers do not. Even
trace amounts of linear chains dominate the mechanical properties if
present as impurities. Investigation of carefully purified ring
polymers reveals they exhibit self-similar dynamics and a power-law
stress relaxation.
M. Kapnistos et al.
doi:10.1038/nmat2292
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPu0E8
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPv0EA
ACCORDION-LIKE HONEYCOMBS FOR TISSUE ENGINEERING OF CARDIAC ANISOTROPY
pp1003 - 1010
Construction of tissue-engineering scaffolds that mimic cardiac
anisotropy is a challenge. Now, accordion-like honeycomb scaffolds have
been created that can form tissue grafts with preferentially aligned
heart cells, and with mechanical properties that closely resemble the
anisotropy of native myocardium.
George C. Engelmayr, Jr et al.
doi:10.1038/nmat2316
Abstract: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPw0EB
Article: http://ealerts.nature.com/cgi-bin24/DM/y/eo2u0Xztnp0HjS0CCPx0EC
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