Advance online publication
The latest research papers, published online ahead of print. These online versions are definitive and may be cited using the digital object identifier (DOI).
About advance online publicationLetters
An omnidirectional retroreflector based on the transmutation of dielectric singularities
Yun Gui Ma,
C. K. Ong,
Tomá
Tyc
&
Ulf Leonhardt
Published online: 28 June 2009 | doi:10.1038/nmat2489
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.
First Paragraph - An omnidirectional retroreflector based on the transmutation of dielectric singularities | Full Text - An omnidirectional retroreflector based on the transmutation of dielectric singularities | PDF (1,043 KB) - An omnidirectional retroreflector based on the transmutation of dielectric singularities
Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field
M. Saito, K. Ishikawa, S. Konno, K. Taniguchi & T. Arima
Published online: 28 June 2009 | doi:10.1038/nmat2492
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.
First Paragraph - Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field | Full Text - Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field | PDF (2,066 KB) - Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field | Supplementary information
Sequential click reactions for synthesizing and patterning three-dimensional cell microenvironments
Cole A. DeForest, Brian D. Polizzotti & Kristi S. Anseth
Published online: 21 June 2009 | doi:10.1038/nmat2473
'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.
First Paragraph - Sequential click reactions for synthesizing and patterning three-dimensional cell microenvironments | Full Text - Sequential click reactions for synthesizing and patterning three-dimensional cell microenvironments | PDF (953 KB) - Sequential click reactions for synthesizing and patterning three-dimensional cell microenvironments | Supplementary information
Atomic-scale imaging of individual dopant atoms in a buried interface
N. Shibata, S. D. Findlay, S. Azuma, T. Mizoguchi, T. Yamamoto & Y. Ikuhara
Published online: 21 June 2009 | doi:10.1038/nmat2486
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.
First Paragraph - Atomic-scale imaging of individual dopant atoms in a buried interface | Full Text - Atomic-scale imaging of individual dopant atoms in a buried interface | PDF (1,250 KB) - Atomic-scale imaging of individual dopant atoms in a buried interface | Supplementary information
Electronic and magnetic phase diagram of 
-Fe1.01Se with superconductivity at 36.7 K under pressure
S. Medvedev, T. M. McQueen, I. A. Troyan, T. Palasyuk, M. I. Eremets, R. J. Cava, S. Naghavi, F. Casper, V. Ksenofontov, G. Wortmann & C. Felser
Published online: 14 June 2009 | doi:10.1038/nmat2491
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.
First Paragraph - Electronic and magnetic phase diagram of : [beta]: -Fe: 1.01: Se with superconductivity at 36.7[thinsp]K under pressure | Full Text - Electronic and magnetic phase diagram of 
-Fe1.01Se with superconductivity at 36.7 K under pressure | PDF (44,741 KB) - Electronic and magnetic phase diagram of -Fe1.01Se with superconductivity at 36.7 K under pressure
Articles
Selective positioning of organic dyes in a mesoporous inorganic oxide film
Kyungtae Lee, Se Woong Park, Min Jae Ko, Kyungkon Kim & Nam-Gyu Park
Published online: 28 June 2009 | doi:10.1038/nmat2475
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.
Abstract - Selective positioning of organic dyes in a mesoporous inorganic oxide film | Full Text - Selective positioning of organic dyes in a mesoporous inorganic oxide film | PDF (3,912 KB) - Selective positioning of organic dyes in a mesoporous inorganic oxide film
Printed artificial cilia from liquid-crystal network actuators modularly driven by light
Casper L. van Oosten, Cees W. M. Bastiaansen & Dirk J. Broer
Published online: 28 June 2009 | doi:10.1038/nmat2487
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.
Abstract - Printed artificial cilia from liquid-crystal network actuators modularly driven by light | Full Text - Printed artificial cilia from liquid-crystal network actuators modularly driven by light | PDF (1,149 KB) - Printed artificial cilia from liquid-crystal network actuators modularly driven by light
The dynamic organic p–n junction
Piotr Matyba, Klara Maturova, Martijn Kemerink, Nathaniel D. Robinson & Ludvig Edman
Published online: 21 June 2009 | doi:10.1038/nmat2478
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.
Abstract - The dynamic organic p-n junction | Full Text - The dynamic organic p–n junction | PDF (690 KB) - The dynamic organic p–n junction | Supplementary information
Linking a completely three-dimensional nanostrain to a structural transformation eigenstrain
Wim Tirry & Dominique Schryvers
Published online: 21 June 2009 | doi:10.1038/nmat2488
The successful use of shape-memory alloys relies on the microscopic understanding of the associated phase transformations. A recently developed analytical technique of structural data is now applied to nanoprecipitates in Ni–Ti, and clearly reveals a connection between the strain that these precipitates introduce and the phase transformation that is often observed.
Abstract - Linking a completely three-dimensional nanostrain to a structural transformation eigenstrain | Full Text - Linking a completely three-dimensional nanostrain to a structural transformation eigenstrain | PDF (1,022 KB) - Linking a completely three-dimensional nanostrain to a structural transformation eigenstrain | Supplementary information
Until print versions of AOP papers are published, they should be cited in the style "Author(s) Nature Materials advance online publication, day month year (doi:10.1038/nmatXXXXX)". Once the print version (identical to the AOP) is published, it should be cited as follows: "Author(s) Nature Materials volume, page (year); advance online publication, (doi:10.1038/nmatXXXXX)".
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