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| Open AccessReversed oxygen sensing using colloidal quantum wells towards highly emissive photoresponsive varnishes
Colloidal quantum wells have great potential as solution-processed light sources. Here, Lorenzon et al. demonstrate that such colloidal quantum wells can also be exploited as luminescent-sensing varnishes capable of detecting chemical agents through their reversible emission response.
- Monica Lorenzon
- , Sotirios Christodoulou
- & Sergio Brovelli
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Berry phases and the intrinsic thermal Hall effect in high-temperature cuprate superconductors
A fully quantum mechanical description of the thermal Hall effect in high-temperature cuprate superconductors remains elusive. Here, by connecting it to momentum space Berry phases, the authors calculate the dependence of the intrinsic thermal Hall conductivity on temperature, external field and pairing gap.
- Vladimir Cvetkovic
- & Oskar Vafek
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Article
| Open AccessMultiple-length-scale deformation analysis in a thermoplastic polyurethane
Thermoplastic polyurethane elastomers are of interest in many applications, but their structure–property relations are not well understood. Here, the authors perform a multiple-length-scale deformation analysis on a thermoplastic polyurethane and shed light on morphological changes during the deformation.
- Tan Sui
- , Nikolaos Baimpas
- & Alexander M. Korsunsky
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| Open AccessConsequences of chirality on the dynamics of a water-soluble supramolecular polymer
Water-soluble supramolecular polymers assemble from individual building blocks, but there is a lack of understanding as to how the properties depend on the components. Here the authors show how the introduction of chiral groups can affect the structural features and dynamic behaviour of the polymer.
- Matthew B. Baker
- , Lorenzo Albertazzi
- & E.W. Meijer
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| Open AccessPorous coordination polymers with ubiquitous and biocompatible metals and a neutral bridging ligand
Inexpensive porous materials synthesized from Group II metals may be useful for industrial applications. Here, the authors demonstrate that neutral bridging ligands can be used for the synthesis of magnesium(II) and calcium(II) porous coordination polymers.
- Shin-ichiro Noro
- , Junya Mizutani
- & Takayoshi Nakamura
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| Open AccessA molecular nematic liquid crystalline material for high-performance organic photovoltaics
There is a trade-off between increasing thickness of active layers in organic photovoltaic cells to be compatible with modern printing techniques and decreasing it to improve the device performance. Sun et al.report a nematic liquid crystalline molecular electron donor material used in thick layers.
- Kuan Sun
- , Zeyun Xiao
- & David J. Jones
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Ion transport controlled by nanoparticle-functionalized membranes
The regulated passage of ions through a porous membrane is a process applicable to various research disciplines. Here, the authors present a method for the control of porous membrane ion transport, using a deposited layer of ligand-functionalized nanoparticles.
- Edward Barry
- , Sean P. McBride
- & Xiao-Min Lin
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Ultralight nanofibre-assembled cellular aerogels with superelasticity and multifunctionality
Materials with ultra-low densities can display a range of useful properties, ranging from compressibility to sound absorption. Here, the authors report the fabrication of ultra-lightweight materials by the assembly of electrospun nanofibres into an aerogel and examine the mechanical properties.
- Yang Si
- , Jianyong Yu
- & Bin Ding
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A trident dithienylethene-perylenemonoimide dyad with super fluorescence switching speed and ratio
Photoswitchable fluorophores hold promise for organic photonic devices. Here Li et al. report that a trident perylenemonoimide modified by diethienylethenes shows a large on/off ratio and high switching speed, which enables erasable fluorescence patterning, all-optical transistors and optical nanoimaging.
- Chong Li
- , Hui Yan
- & Ming-Qiang Zhu
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High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene
So-called two-dimensional superconductivity has been reported in several material systems but just how thin a system can be and maintain a superconducting state has been difficult to determine. Da Jiang and colleagues demonstrate that Bi2Sr2CaCu2O8+xcontinues to be superconducting even when it is just half a unit cell thick.
- Da Jiang
- , Tao Hu
- & Mianheng Jiang
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| Open AccessAnomalous critical fields in quantum critical superconductors
Superconductivity in the iron pnictides is believed to be related to quantum critical fluctuations. Putzke et al. observe unexpected anomalies in the critical fields of BaFe2(As1−xPx)2that emerge close to its magnetic critical point, which they argue is a generic feature of quantum critical superconductivity.
- C. Putzke
- , P. Walmsley
- & A. Carrington
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Kinetically tuned dimensional augmentation as a versatile synthetic route towards robust metal–organic frameworks
The synthesis of ultra-stable, single crystalline metal–organic frameworks is challenging. Here, the authors describe a kinetically tuned augmentation synthetic route for the preparation of a range of robust crystalline materials from preformed trimetallic components.
- Dawei Feng
- , Kecheng Wang
- & Hong-Cai Zhou
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Article
| Open AccessPolymer collapse in miscible good solvents is a generic phenomenon driven by preferential adsorption
Smart polymers exhibit a swelling–collapse–swelling transition in mixed (co)solvents and the underlined mechanism remains a matter of debate. Mukherji et al. explain this transition using a generic model based purely on a thermodynamic treatment of preferential polymer–cosolvent interaction.
- Debashish Mukherji
- , Carlos M. Marques
- & Kurt Kremer
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A general and scalable synthesis approach to porous graphene
Scalable routes towards porous graphene are useful for developing materials for mass transfer applications. Here, the authors report the fabrication of porous graphene with controllable pore size and nitrogen content via the carbothermal reaction of graphene and (poly)oxometallates.
- Ding Zhou
- , Yi Cui
- & Bao-Hang Han
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Control superstructure of rigid polyelectrolytes in oppositely charged hydrogels via programmed internal stress
Biomaterials composed of macromolecules display complex structures with long range order, but it is difficult to create similarly complex superstructures in hydrogels. Here, the authors control the orientation of polyelectrolytes in hydrogels by introducing programmed swelling patterns and internal stresses.
- Riku Takahashi
- , Zi Liang Wu
- & Jian Ping Gong
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Engineering chiral porous metal-organic frameworks for enantioselective adsorption and separation
The separation of chiral molecules is a fundamental and industrially relevant challenge. Here, the authors report a chiral metal-organic framework that functions as a solid-state host capable of absorbing and separating mixtures of a range of chiral amines, with high enatioselectivity.
- Yongwu Peng
- , Tengfei Gong
- & Yong Cui
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Self-assembly of colloid-cholesteric composites provides a possible route to switchable optical materials
Colloidal particles dispersed in liquid crystal hold promise for new functional materials with tunable elastic and electro-optic properties. Through simulations, Stratford et al.predict a new class of colloidal networks in a chiral liquid crystal host, which could guide the design of these materials.
- K. Stratford
- , O. Henrich
- & D. Marenduzzo
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| Open AccessA liquid crystalline chirality balance for vapours
Chiral determination of vapours is possible in biological systems as an important part of the olfactory system. Here, the authors describe a system that is capable of visually detecting and distinguishing the chirality of vapour-phase molecules by structural changes in a liquid crystal confined in open microchannels.
- Takuya Ohzono
- , Takahiro Yamamoto
- & Jun-ichi Fukuda
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High-energy spin and charge excitations in electron-doped copper oxide superconductors
Understanding spin dynamics in the cuprates is vital to understanding the origin high-temperature superconductivity. X-ray and neutron spectra obtained by Ishii et al.suggest that the spins in electron-doped cuprates are itinerant, in contrast to recent evidence that in hole-doped cuprates they are localized.
- K. Ishii
- , M. Fujita
- & J. Mizuki
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Spatially and temporally reconfigurable assembly of colloidal crystals
Controlling colloidal assemblies without the need of a template or electrode is still a challenging goal. Here Kim et al.use photo-induced ion flow in an indium tin oxide-coated substrate to control this process, allowing reversible assembly of colloidal crystals in a three-dimensional manner.
- Youngri Kim
- , Aayush A. Shah
- & Michael J. Solomon
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Novel polymer-free iridescent lamellar hydrogel for two-dimensional confined growth of ultrathin gold membranes
The structure of hydrogels is normally isotropic, but anisotropic hydrogels with a periodic lamellar structure can also be synthesized. Here the confined water layers in a lamellar hydrogel are used to guide the growth of large area, single-crystalline gold membranes with two-dimensional properties.
- Jian Niu
- , Dong Wang
- & Jian Jin
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Electrofluorochromism in π-conjugated ionic liquid crystals
The ability to easily modulate a material’s photoluminescent properties in response to stimuli is difficult to achieve in liquid crystals. Here the authors report ionic liquid crystals exhibiting high fluorescent quantum yields with redox-dependent photoluminescence.
- Amerigo Beneduci
- , Sante Cospito
- & Giuseppe Chidichimo
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| Open AccessEfficient and tunable white-light emission of metal–organic frameworks by iridium-complex encapsulation
Although many metal–organic frameworks are luminescent, few are capable of white-light emission. Here, the authors incorporate a yellow-emitting guest molecule into the cavities of a blue-emitting metal–organic framework, and tune the composition to emit white light with relatively high quantum yield.
- Chun-Yi Sun
- , Xin-Long Wang
- & Jing Li
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| Open AccessConfinement of pyridinium hemicyanine dye within an anionic metal-organic framework for two-photon-pumped lasing
Two-photon-pumped dye lasers are useful for applications such as biological imaging; however, loss processes reduce their efficiency. Here, metal-organic frameworks, into which the laser dye is incorporated, demonstrate enhanced laser operation because losses such as dye aggregation-caused quenching are reduced.
- Jiancan Yu
- , Yuanjing Cui
- & Guodong Qian
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| Open AccessLocalized cell stimulation by nitric oxide using a photoactive porous coordination polymer platform
Localized cell stimulation is useful in the analysis of biological signalling networks. Here the authors develop a photosensitive porous framework to achieve spatiotemporally controlled cellular delivery of the gaseous biomolecule nitric oxide, using it to regulate intracellular calcium levels.
- Stéphane Diring
- , Dan Ohtan Wang
- & Shuhei Furukawa
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Revealing the ultrafast process behind the photoreduction of graphene oxide
Photoreduction is a promising method for the synthesis of reduced graphene oxide, but the dynamics of the process are unclear. Here, the authors explore the process via a pump–probe technique, revealing its ultrafast nature and the involvement of solvated electrons produced by irradiation of the solvent.
- Régis Y. N. Gengler
- , Daniel S. Badali
- & R. J. Dwayne Miller
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Selective anion exchange with nanogated isoreticular positive metal-organic frameworks
Crystalline porous materials are commonly based around negatively charged frameworks, so ion-exchange is limited to cations. Here, the authors report a series of positive metal-organic frameworks, capable of ion exchange of large organic anions, with potential in separation and purification applications.
- Xiang Zhao
- , Xianhui Bu
- & Pingyun Feng
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Disk-cylinder and disk-sphere nanoparticles via a block copolymer blend solution construction
Compositionally and geometrically complex nano-objects are an important goal in medicinal, photonic and electronic materials research. Here, the authors fabricate disk-sphere and disk-cylinder nanoparticles with defined multicompartments from binary mixtures of block copolymers.
- Jiahua Zhu
- , Shiyi Zhang
- & Darrin J. Pochan
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Reversible patterning and actuation of hydrogels by electrically assisted ionoprinting
Techniques for shape-controlling of hydrogels, that is, crosslinked networks of polymers, could make possible various biomimetic applications. Palleau et al.propose a strategy to pattern three-dimensional hydrogels using electric potential, which allows directed bending and fast controllable actuation.
- Etienne Palleau
- , Daniel Morales
- & Orlin D. Velev
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Interfacial assembly of protein–polymer nano-conjugates into stimulus-responsive biomimetic protocells
Proteins are ideal building blocks for self-assembly of artificial cell-like architectures, but their realization is rare. Huang et al.report an interfacial assembly of protein–polymer conjugates, which exhibit cellular properties such as encapsulating guest molecules and switching enzyme activity.
- Xin Huang
- , Mei Li
- & Stephen Mann
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An influenza virus-inspired polymer system for the timed release of siRNA
Small interfering RNA is degraded by plasma and can’t cross the cell membrane due to its negative charge. Here, the authors present an influenza inspired polymer carrier, capable of local RNA delivery, which degrades to a non-toxic by-product, and is thus suitable for multiple doses.
- Nghia P Truong
- , Wenyi Gu
- & Michael J Monteiro
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| Open AccessA synthetic route to ultralight hierarchically micro/mesoporous Al(III)-carboxylate metal-organic aerogels
Hierarchically porous metal-organic monoliths are potential materials for mass transfer applications. Here, the authors synthesize metal-organic aerogels via the gelation of metal-organic frameworks, and are able to tune their porosity exploiting the properties of both crystalline and aerogel materials.
- Lei Li
- , Shenglin Xiang
- & Cheng-Yong Su
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New materials for methane capture from dilute and medium-concentration sources
Methane is an important greenhouse gas but its capture presents a challenge due to its weak interactions with most materials. Here the authors perform a systematic screening of liquid solvents and nanoporous zeolites, and identify zeolite structures with good potential for methane uptake and separation.
- Jihan Kim
- , Amitesh Maiti
- & Roger D. Aines
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Moderate doping leads to high performance of semiconductor/insulator polymer blend transistors
Blends of different polymer compounds are widely used for organic field-effect transistors. Here, Neher and colleagues show that moderate carrier doping is important to achieve maximum performance in blends of insulating and semiconducting polymers.
- Guanghao Lu
- , James Blakesley
- & Dieter Neher
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Probing the catalytic activity of porous graphene oxide and the origin of this behaviour
Graphene oxide has been proposed as an alternative to precious metals for the catalysis of aerobic oxidative reactions; however, high catalyst loadings are needed. Here a simple base and acid treatment is shown to enhance its catalytic activity for the oxidative coupling of amines under ambient conditions.
- Chenliang Su
- , Muge Acik
- & Kian Ping Loh
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Biomimetic superelastic graphene-based cellular monoliths
The exploitation of the properties of graphene, such as mechanical strength and electrical conductivity, in deformable macroscopic materials is desirable. Here, a combination of graphene chemistry and ice physics is used to fabricate biomimetic, ultralight and superelastic graphene cellular monoliths.
- Ling Qiu
- , Jeffery Z. Liu
- & Dan Li
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Monodisperse conjugated polymer particles by Suzuki–Miyaura dispersion polymerization
Well-defined, monodisperse colloids of semiconducting polymers are required as new photonic and optoelectronic materials. Here, a Suzuki–Miyaura dispersion polymerization is used to produce monodisperse sub-micrometer particles of a range of semiconducting polymers.
- Alexander J.C. Kuehne
- , Malte C. Gather
- & Joris Sprakel
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Stirring competes with chemical induction in chiral selection of soft matter aggregates
Chirality can be induced both by physical forces and by chemical induction processes. Here, a self-assembled system is reported in which chiral selection is controlled by the combined action of a chiral dopant and vortical stirring, which can act either constructively or destructively.
- Núria Petit-Garrido
- , Josep Claret
- & Francesc Sagués
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Article
| Open AccessAmbient-stable tetragonal phase in silver nanostructures
Crystallization of noble metal atoms usually leads to the thermodynamically stable face-centred cubic phase. Sunet al. show that internal strain in silver nanoparticles leads to lattice distortion and a stable body-centred tetragonal phase.
- Yugang Sun
- , Yang Ren
- & Dean J. Miller
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Microporous metal-organic framework with potential for carbon dioxide capture at ambient conditions
Metal-organic frameworks are promising candidates for capturing and sequestering carbon dioxide. Chen and co-workers report a metal-organic framework that exhibits high uptake of carbon dioxide at ambient conditions, and is a potentially useful adsorbent for post-combustion carbon dioxide capture.
- Shengchang Xiang
- , Yabing He
- & Banglin Chen
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Tuning the magneto-structural properties of non-porous coordination polymers by HCl chemisorption
Tuning the properties of responsive materials by applying an external stimulus could lead to their application as chemical switches or molecular sensors. Coronadoet al. develop a non-porous one-dimensional coordination polymer, the magnetic properties of which undergo drastic changes on chemisorption of gaseous HCl.
- Eugenio Coronado
- , Mónica Giménez-Marqués
- & Lee Brammer
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Local chiral symmetry breaking in triatic liquid crystals
Studying the structures of dense colloidal systems of anisotropic Brownian particles provides insight into fundamental processes like protein crystallization. Zhaoet al. study the phases of two-dimensional triatic liquid crystals and find that one of them exhibits local chiral-symmetry breaking.
- Kun Zhao
- , Robijn Bruinsma
- & Thomas G. Mason
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Prominent electrochromism through vacancy-order melting in a complex oxide
Electrochromic materials reversibly change their colour upon application of an electric field. Seidelet al. measure the optical properties of doped bismuth ferrite and report the largest electrochromic response for an inorganic material, which they attribute to the melting of oxygen-vacancy ordering.
- J. Seidel
- , W. Luo
- & R. Ramesh
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Spin waves and magnetic exchange interactions in insulating Rb0.89Fe1.58Se2
Unlike the other iron-based superconductors, the parent compounds of the alkaline iron selenide superconductors are insulators. Dai and colleagues examine the spin-wave excitations in these materials and uncover evidence for a common magnetic origin for all iron-based superconductors.
- Miaoyin Wang
- , Chen Fang
- & Pengcheng Dai
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Superconductivity at 5 K in alkali-metal-doped phenanthrene
Intercalating alkali metals into picene—a hydrocarbon with five linearly fused benzene rings—results in superconducting materials. Now, alkali-metal-doped phenanthrene, which consists of three fused benzene rings, is also found to be superconducting, opening up a broader class of organic superconductors.
- X.F. Wang
- , R.H. Liu
- & X.H. Chen
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Article
| Open AccessHigh pressure route to generate magnetic monopole dimers in spin ice
Spin ices are magnetic materials in which excitations equivalent to monopoles can occur. Using high-pressure techniques, Zhouet al. synthesize a new member of the spin ice family, Dy2Ge2O7, in which monopoles exist at higher densities, and can stabilize as dimers.
- H.D. Zhou
- , S.T. Bramwell
- & J.S. Gardner
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| Open AccessAdvantageous grain boundaries in iron pnictide superconductors
High critical temperature superconductors could be used to produce ideal electric power lines, but the misalignment of crystalline grain boundaries reduces current density. Here, pnictide superconductors are found to be more tolerant to misaligned grain boundaries than cuprates.
- Takayoshi Katase
- , Yoshihiro Ishimaru
- & Hideo Hosono
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| Open AccessProximity of iron pnictide superconductors to a quantum tricritical point
In some iron-based materials, unconventional superconductivity can emerge near a quantum phase transition where long-range magnetic order vanishes. Giovannettiet al.show that the magnetic quantum phase transition in an iron pnictide superconductor is very close to the quantum tricritical point.
- Gianluca Giovannetti
- , Carmine Ortix
- & José Lorenzana
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| Open AccessA new method to position and functionalize metal-organic framework crystals
Metal-organic frameworks (MOFs) have potential catalysis, filtration and sensing applications, but device fabrication will require controlled MOF growth. Here, α-hopeite microparticles are used to achieve spatial control of MOF nucleation, and accelerate MOF growth.
- Paolo Falcaro
- , Anita J. Hill
- & Dario Buso