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Nature Nanotechnology

Yang-Kook Sun, Chong S Yoon
No abstract text is available yet for this article.
March 27, 2017: Nature Nanotechnology
Christopher K Ober
No abstract text is available yet for this article.
March 27, 2017: Nature Nanotechnology
Langli Luo, Bin Liu, Shidong Song, Wu Xu, Ji-Guang Zhang, Chongmin Wang
The performances of a Li-O2 battery depend on a complex interplay between the reaction mechanism at the cathode, the chemical structure and the morphology of the reaction products, and their spatial and temporal evolution; all parameters that, in turn, are dependent on the choice of the electrolyte. In an aprotic cell, for example, the discharge product, Li2O2, forms through a combination of solution and surface chemistries that results in the formation of a baffling toroidal morphology. In a solid electrolyte, neither the reaction mechanism at the cathode nor the nature of the reaction product is known...
March 27, 2017: Nature Nanotechnology
Prakash Shrestha, Sagun Jonchhe, Tomoko Emura, Kumi Hidaka, Masayuki Endo, Hiroshi Sugiyama, Hanbin Mao
Molecular simulations suggest that the stability of a folded macromolecule increases in a confined space due to entropic effects. However, due to the interactions between the confined molecular structure and the walls of the container, clear-cut experimental evidence for this prediction is lacking. Here, using DNA origami nanocages, we show the pure effect of confined space on the property of individual human telomeric DNA G-quadruplexes. We induce targeted mechanical unfolding of the G-quadruplex while leaving the nanocage unperturbed...
March 27, 2017: Nature Nanotechnology
Hyo Seon Suh, Do Han Kim, Priya Moni, Shisheng Xiong, Leonidas E Ocola, Nestor J Zaluzec, Karen K Gleason, Paul F Nealey
Directed self-assembly (DSA) of the domain structure in block copolymer (BCP) thin films is a promising approach for sub-10-nm surface patterning. DSA requires the control of interfacial properties on both interfaces of a BCP film to induce the formation of domains that traverse the entire film with a perpendicular orientation. Here we show a methodology to control the interfacial properties of BCP films that uses a polymer topcoat deposited by initiated chemical vapour deposition (iCVD). The iCVD topcoat forms a crosslinked network that grafts to and immobilizes BCP chains to create an interface that is equally attractive to both blocks of the underlying copolymer...
March 27, 2017: Nature Nanotechnology
Yongju Kim, Huichang Li, Ying He, Xi Chen, Xiaoteng Ma, Myongsoo Lee
Hierarchical assemblies of biomolecular subunits can carry out versatile tasks at the cellular level with remarkable spatial and temporal precision. As an example, the collective motion and mutual cooperation between complex protein machines mediate essential functions for life, such as replication, synthesis, degradation, repair and transport. Nucleic acid molecules are far less dynamic than proteins and need to bind to specific proteins to form hierarchical structures. The simplest example of these nucleic acid-based structures is provided by a rod-shaped tobacco mosaic virus, which consists of genetic material surrounded by coat proteins...
March 27, 2017: Nature Nanotechnology
Mingxu You, Yifan Lyu, Da Han, Liping Qiu, Qiaoling Liu, Tao Chen, Cuichen Sam Wu, Lu Peng, Liqin Zhang, Gang Bao, Weihong Tan
Cells interact with the extracellular environment through molecules expressed on the membrane. Disruption of these membrane-bound interactions (or encounters) can result in disease progression. Advances in super-resolution microscopy have allowed membrane encounters to be examined, however, these methods cannot image entire membranes and cannot provide information on the dynamic interactions between membrane-bound molecules. Here, we show a novel DNA probe that can transduce transient membrane encounter events into readable cumulative fluorescence signals...
March 20, 2017: Nature Nanotechnology
Justin T Foy, Quan Li, Antoine Goujon, Jean-Rémy Colard-Itté, Gad Fuks, Emilie Moulin, Olivier Schiffmann, Damien Dattler, Daniel P Funeriu, Nicolas Giuseppone
A current challenge in the field of artificial molecular machines is the synthesis and implementation of systems that can produce useful work when fuelled with a constant source of external energy. The first experimental achievements of this kind consisted of machines with continuous unidirectional rotations and translations that make use of 'Brownian ratchets' to bias random motions. An intrinsic limitation of such designs is that an inversion of directionality requires heavy chemical modifications in the structure of the actuating motor part...
March 20, 2017: Nature Nanotechnology
Paul A Beales
No abstract text is available yet for this article.
March 20, 2017: Nature Nanotechnology
Chenfeng Ke
No abstract text is available yet for this article.
March 20, 2017: Nature Nanotechnology
Antonio Fornieri, Giuliano Timossi, Pauli Virtanen, Paolo Solinas, Francesco Giazotto
Two superconductors coupled by a weak link support an equilibrium Josephson electrical current that depends on the phase difference ϕ between the superconducting condensates. Yet, when a temperature gradient is imposed across the junction, the Josephson effect manifests itself through a coherent component of the heat current that flows opposite to the thermal gradient for |ϕ| < π/2 (refs 2-4). The direction of both the Josephson charge and heat currents can be inverted by adding a π shift to ϕ...
March 13, 2017: Nature Nanotechnology
Jonathan Clayden
No abstract text is available yet for this article.
March 13, 2017: Nature Nanotechnology
Louis Biadala, Elena V Shornikova, Anna V Rodina, Dmitri R Yakovlev, Benjamin Siebers, Tangi Aubert, Michel Nasilowski, Zeger Hens, Benoit Dubertret, Alexander L Efros, Manfred Bayer
Non-magnetic colloidal nanostructures can demonstrate magnetic properties typical for diluted magnetic semiconductors because the spins of dangling bonds at their surface can act as the localized spins of magnetic ions. Here we report the observation of dangling-bond magnetic polarons (DBMPs) in 2.8-nm diameter CdSe colloidal nanocrystals (NCs). The DBMP binding energy of 7 meV is measured from the spectral shift of the emission lines under selective laser excitation. The polaron formation at low temperatures occurs by optical orientation of the dangling-bond spins (DBSs) that result from dangling-bond-assisted radiative recombination of spin-forbidden dark excitons...
March 13, 2017: Nature Nanotechnology
Francesca Ruggeri, Franziska Zosel, Natalie Mutter, Mirosława Różycka, Magdalena Wojtas, Andrzej Ożyhar, Benjamin Schuler, Madhavi Krishnan
Mass and electrical charge are fundamental properties of biological macromolecules. Although molecular mass has long been determined with atomic precision, a direct and precise determination of molecular charge remains an outstanding challenge. Here we report high-precision (<1e) measurements of the electrical charge of molecules such as nucleic acids, and globular and disordered proteins in solution. The measurement is based on parallel external field-free trapping of single macromolecules, permits the estimation of a dielectric coefficient of the molecular interior and can be performed in real time...
March 13, 2017: Nature Nanotechnology
Quan Gan, Xiang Wang, Brice Kauffmann, Frédéric Rosu, Yann Ferrand, Ivan Huc
At the molecular level, translation refers to the production of a new entity according to a template that has a different chemical composition. In this way, chemical information may be translated from one molecule to another. The process is useful to synthesize structures and thus functions that might be difficult to create otherwise, and it reaches exquisite levels of efficiency in biological systems, as illustrated by protein expression from mRNA templates or by the assembly of the tobacco mosaic virus capsid protein according to the length of its RNA...
March 13, 2017: Nature Nanotechnology
Taeyoung Choi, William Paul, Steffen Rolf-Pissarczyk, Andrew J Macdonald, Fabian D Natterer, Kai Yang, Philip Willke, Christopher P Lutz, Andreas J Heinrich
Spin resonance provides the high-energy resolution needed to determine biological and material structures by sensing weak magnetic interactions. In recent years, there have been notable achievements in detecting and coherently controlling individual atomic-scale spin centres for sensitive local magnetometry. However, positioning the spin sensor and characterizing spin-spin interactions with sub-nanometre precision have remained outstanding challenges. Here, we use individual Fe atoms as an electron spin resonance (ESR) sensor in a scanning tunnelling microscope to measure the magnetic field emanating from nearby spins with atomic-scale precision...
March 6, 2017: Nature Nanotechnology
Peter Tseng, Bradley Napier, Siwei Zhao, Alexander N Mitropoulos, Matthew B Applegate, Benedetto Marelli, David L Kaplan, Fiorenzo G Omenetto
In natural systems, directed self-assembly of structural proteins produces complex, hierarchical materials that exhibit a unique combination of mechanical, chemical and transport properties. This controlled process covers dimensions ranging from the nano- to the macroscale. Such materials are desirable to synthesize integrated and adaptive materials and systems. We describe a bio-inspired process to generate hierarchically defined structures with multiscale morphology by using regenerated silk fibroin. The combination of protein self-assembly and microscale mechanical constraints is used to form oriented, porous nanofibrillar networks within predesigned macroscopic structures...
February 27, 2017: Nature Nanotechnology
Anyin Li, Yunlong Zi, Hengyu Guo, Zhong Lin Wang, Facundo M Fernández
Ion sources for molecular mass spectrometry are usually driven by direct current power supplies with no user control over the total charges generated. Here, we show that the output of triboelectric nanogenerators (TENGs) can quantitatively control the total ionization charges in mass spectrometry. The high output voltage of TENGs can generate single- or alternating-polarity ion pulses, and is ideal for inducing nanoelectrospray ionization (nanoESI) and plasma discharge ionization. For a given nanoESI emitter, accurately controlled ion pulses ranging from 1...
February 27, 2017: Nature Nanotechnology
Manuel Melle-Franco
No abstract text is available yet for this article.
February 13, 2017: Nature Nanotechnology
Jeffrey Abbott, Tianyang Ye, Ling Qin, Marsela Jorgolli, Rona S Gertner, Donhee Ham, Hongkun Park
Developing a new tool capable of high-precision electrophysiological recording of a large network of electrogenic cells has long been an outstanding challenge in neurobiology and cardiology. Here, we combine nanoscale intracellular electrodes with complementary metal-oxide-semiconductor (CMOS) integrated circuits to realize a high-fidelity all-electrical electrophysiological imager for parallel intracellular recording at the network level. Our CMOS nanoelectrode array has 1,024 recording/stimulation 'pixels' equipped with vertical nanoelectrodes, and can simultaneously record intracellular membrane potentials from hundreds of connected in vitro neonatal rat ventricular cardiomyocytes...
February 13, 2017: Nature Nanotechnology
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