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Cellular solids are becoming increasingly popular for sandwich core and energy-absorbing applications in many automotive and other transportation structures. This paper investigates experimentally and numerically the strength and post-failure energy absorption of a popular hexagonal aluminium honeycomb material under multi-axial loading conditions. For the experimental work, an improved Arcan test apparatus is used so that interaction of multi-axial compression and shear loading on failure and crushing may be studied; optical measuring methods are used to extract deformation data. In addition, experimental work to characterise the material with pre-deformation in the in-plane directions has also been conducted. This experimental work provides input for computational modelling of the material and two alternative modelling approaches have been investigated. First, a three-dimensional anisotropic, elastic-plastic model, with coupling of loading components is used to represent the material at the macro-level and, second, a meso-modelling approach using a fine shell representation of the thin-walled honeycomb cellular structure is applied. For practical analysis of large-scale structures, the former approach is computationally efficient and can reasonably treat the most important failure and crush characteristics of the material. However, for more accurate analysis, particularly in the case of complex non-proportional loading, the meso-shell model may provide a more realistic solution. [ABSTRACT FROM AUTHOR]

The procedure allowing single-step formation of microscaled thermostable polymer honeycomb patterns is reported. Polymer substrates soluble in chlorinated solvents were pulled from the solvents before their final dissolution and placed into a humid atmosphere. Honeycomb patterns were deposited by this method on polyetherimide, polysulfone (PSF), and polyethersulfone (PESF) substrates. PSF and PESF substrates demonstrated reversibly switchable wetting under UV irradiation/heating cycles strengthened by the Cassie-Baxter wetting regime. Copyright © 2010 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

We introduce a twobody quantum Hamiltonian model with spins${1 \over 2}$located on the vertices of a 2D spatial lattice. The model exhibits an exact topological degeneracy in all coupling regimes. This is a remarkable nonperturbative effect. The model has a Z2× Z2gauge group symmetry and stringnet integrals of motion. There exists a gapped phase in which the lowenergy sector reproduces an effective topological color code model. High energy excitations fall into three families of anyonic fermions that turn out to be strongly interacting. All these, and more, are new features not present in honeycomb lattice models like Kitaev model. [ABSTRACT FROM AUTHOR]

Porous materials have received extensive attention for energy absorption in the last few years. In terms of this study, austenitic TRIP-steel/Mg-PSZ-composite honeycomb structures are formed with different mixing proportions due to ceramic extrusion at room temperature. Their specific energy absorption SEA as well as their compression strength have been registered as a function of the compressive strain. X-ray diffractometry (XRD), electron backscatter diffraction (EBSD) as well as electron dispersive X-ray (EDX) analysis support the microstructure characterization. The zirconia addition has mainly contributed as a hard phase in a ductile TRIP steel matrix and has reinforced the composite material up to a compressive strain of about 24%. [ABSTRACT FROM AUTHOR]

A fabrication technology has been developed for a novel high-performance solid oxide fuel cells with honeycomb structure via the extrusion of a cathode-honeycomb monolith and subsequent channel surface coating with electrolyte/anode bilayers. A novel coating technique for the preparation of dense electrolyte films on the channel surfaces in cathode honeycomb supports is reported. When the dipping method is used, the high viscous resistance of the electrolyte slurry inhibited slurry penetration into the microchannels, which resulted in insufficient channel surface coating. By contrast, the newly developed channel coating technique, i.e. the slurry injection method, allowed the slurry to be injected into the honeycomb channels without the formation of any coating defects. [ABSTRACT FROM AUTHOR]

We report the design and fabrication of a novel electrode-supported honeycomb solid oxide fuel cell (SOFC), that can generate high volumetric power density. Among various cell designs, honeycomb SOFCs are suitable for compact SOFC modules because they have a large surface electrode area per unit volume. We have succeeded in fabricating a cathode-supported honeycomb SOFC via extrusion of a LaSrMnO3 honeycomb monolith and through the use of a new slurry injection method for the channel surface coating using electrolyte/anode bi-layers. The fabricated honeycomb SOFCs exhibited high volumetric power densities of approximately 1.2 W/cm3 at 600°C under a wet H2 fuel flow. [ABSTRACT FROM AUTHOR]

Keywords: biomaterials; coiled-coils; crystal engineering; intrinsically disordered peptide capture; macrocycles EN biomaterials coiled-coils crystal engineering intrinsically disordered peptide capture macrocycles 14563 14563 1 10/27/21 20211021 NES 211021 B From the drawing board to the product b , crystalline protein assemblies with alternating compact and porous layers were obtained. Biomaterials, coiled-coils, crystal engineering, intrinsically disordered peptide capture, macrocycles Cover Feature: Segregated Protein-Cucurbit[7]uril Crystalline Architectures via Modulatory Peptide Tectons (Chem. Eur. J. 59/2021). [Extracted from the article]

The article reports on the synthesis of a soluble polyimide from 2,2'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and 3,3'-dimethyl-4,4'-diaminodiphenylmethane (DMMDA) using a two-step method. According to the authors, the resulting polyamide had good solubility in strong bipolar solvents, as well as in common low-boiling point solvents. The BPADA-DMMDA polyamide was then dissolved in chloroform. They also reveal that honeycomb films were formed from the BPADA-DMMDA/CHCl3 solution.

The reliability and the effectiveness of three field experimental designs for the assessment of varietal resistance to Pyricularia oryzae was studied for 2 years. Plants were arranged in the field using two sets of three designs: randomized compete block (RCB), adjacent control (AC) and honeycomb (HC). In the first set, plants were inoculated with the fungus and in the second one, plants were naturally infected. Four varieties were used, Maratelli (susceptible control), Roxani, Selenio and Senia (main varieties). Disease progress was recorded as leaf and neck blast. The number of plants of the main varieties required in each design was higher for RCB (90) and lower for AC and HC (30 and 32, respectively). Results showed that disease severity was significantly different in the varieties studied and it was consistent and not affected by the plant arrangement in the field. All experimental designs were reliable and effective for the assessment of leaf and neck blast under inoculation or natural infection. AC and HC designs had the advantage of requiring fewer plants over RCB one. This could be important in cases where seed availability is a limiting factor. [ABSTRACT FROM AUTHOR]

The shape of the honeycomb core must be considered in the analysis of the problem of electromagnetic wave scattering in a honeycomb sandwich structure at high frequency. The three-layer sandwich structure has the characteristic of having a very small dielectric region with respect to its entire volume, since it has a structure in which the upper and lower skin sandwich between them a honeycomb core which contains many honeycomb-shaped holes. On the other hand, volume integral equations have the advantage of discretizing only the dielectric region, since only the polarized electric current of the dielectric region is an unknown. Thus, electromagnetic wave simulation of the three-layer honeycomb sandwich structure by using volume integral equations is considered to be an effective means for large-scale precision analyses. This paper reports a numerical computing method that takes account of the shape of the honeycomb core, applying three-dimensional volume integral equations to the electromagnetic wave scattering problem of the three-layer honeycomb sandwich structure, and the results of code verification by means of the optical theorem and its reciprocity are presented. In addition, the effectiveness of the proposed numerical computing method is shown by identifying the effects of the honeycomb core on the electrical field intensity distribution inside the skin. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 84(10): 24–33, 2001 [ABSTRACT FROM AUTHOR]

The transverse shear modulus of in-plane negative Poisson’s ratio honeycombs is determined using numerical simulations. General honeycombs have theoretical upper and lower bounds of transverse shear moduli. The actual transverse shear modulus is an intermediate value, depending on the relative density and the gauge thickness ratio. The difference between upper and lower bounds is particularly significant for negative Poisson’s ratio honeycombs. Finite element simulations confirm the theoretical trend, and show gauge ratio dependence different from that envisaged in the literature for conventional honeycombs. A modified approximate formula is thus proposed to predict the actual transverse shear modulus for honeycombs having in-plane negative Poisson’s ratio values. [ABSTRACT FROM AUTHOR]

Presents a study on the thermal and mechanical responses of a Nomex-based honeycomb core through thermal analysis. Experimental procedure; Results and discussion; Conclusions.

In this paper a fast and straightforward waveguide measurement technique is described for the determination of the dielectric constant and loss tangent of many commercially available materials. These dielectric materials include Cuflon, Teflon, Arlon's polyimides, Lockheed's ceramic foams, and Rogers Duroid materials. The effective dielectric constant and loss tangent of Hexsel's honeycomb material is also measured by this method and is compared to the predicted data obtained using the volume averaging theory. The accuracy and other features of this measurement technique are also discussed. [ABSTRACT FROM AUTHOR]

Magnetic charges on the vertices of a two-dimensional artificial magnetic honeycomb lattice can manifest liquid-like quantum mechanical disorderness via charge dynamics. In article number 2004103, Deepak K. Singh, Valeria Lauter, and co-workers demonstrate the existence of massively degenerate paramagnetic ground states at low temperature that are not greatly affected by magnetic field application. [Extracted from the article]

2D Frustrated Magnets: Reentrant Spin Glass and Large Coercive Field Observed in a Spin Integer Dimerized Honeycomb Lattice (Adv. Funct. Keywords: 2D frustrated magnets; dimerized honeycomb lattices; iron(II); neutron scattering; spin glass EN 2D frustrated magnets dimerized honeycomb lattices iron(II) neutron scattering spin glass 1 1 1 01/06/21 20210104 NES 210104 In article number 2004744, Zhendong Fu, Yan-Zhen Zheng, and co-workers report a van der Waals 2D magnetic material bearing a spin-integer dimerized honeycomb lattice. 2D frustrated magnets, dimerized honeycomb lattices, iron(II), neutron scattering, spin glass. [Extracted from the article]

Evidence for Symmetry Breaking in the Ground State of the Si(111)-7 × 7: The Origin of Its Metal-Insulator Transition The perspective and top view of an ideal room-temperature unit cell of a new 5×5 honeycomb structure on Si(111), called the InterDigitated-Faulted-Adatom model (or DFA), are displayed on the frontispiece page. Evidence is presented for a Jahn-Teller distortion in its ground state and phonon-assisted adatom charge density distortions with increasing temperature. [Extracted from the article]

An electron micrograph showing glycogen granules forming highly ordered, honeycomb structures in the subsarcolemmal area of muscle fibers, in a patient with glycogen storage disease due to a mutation in the PYGM gene, which codes for myophosphorylase, the enzyme catalyzing the initial step of glycogen breakdown. See Echaniz‐Laguna et al., pp. 274–282, in this issue. [ABSTRACT FROM AUTHOR]

In this study, density functional theory calculations were performed to investigate the geometric structures, thermodynamic and mechanical stabilities, electronic, and optical properties of two BC2N monolayers with honeycomb structure. The computational results demonstrate that the BC2N monolayers have not only visible‐light absorption, but also high reducing capacity of photo‐induced electrons and excellent carrier mobility. Also, ab initio molecular dynamics simulations with considering the O2 and H2O molecule were carried out, which suggest that the crystal structures of both BC2N monolayers can be well maintained in the moisture‐laden air filled with O2 molecules at 800 K. Accordingly, these BC2N monolayers with promising photoelectronic characteristics and environmental stability could be utilized as metal‐free visible‐light‐driven photocatalysts in high‐temperature environment with moisture and oxygen, which is worthy of being further investigated in experimental and theoretical studies. [ABSTRACT FROM AUTHOR]

Effects of bentonite concentration on morphology and permeation characteristics of bentonite‐doped polysulfone membranes were investigated. Solubility sphere for bentonite was constructed to estimate its solubility parameter. Thermodynamic modeling of phase inversion of this system was carried out using Flory–Huggins theory. The trade‐off between thermodynamic and kinetic parameters was used to predict the membrane morphology for bentonite concentration varying from 0 to 5 wt %. The porosity of bentonite‐doped membranes decreased up to 3 wt % that increased thereafter. Morphological analysis showed dense cross section with finger‐like macrovoids at 3 wt % beyond which it changed to honeycomb structure with large circular voids. Permeability of 3 wt % membrane was the lowest (5.6 × 10−12 m/Pa s) with 95% bovine serum albumin rejection. Contact angle of the membranes decreased from 83 to 66° with bentonite addition making the membrane more hydrophilic. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48450. [ABSTRACT FROM AUTHOR]

Herein, the spin dynamics for various magnetic configurations arranged on a Kagome lattice is investigated. Using a Holstein–Primakoff expansion of the isotropic Heisenberg Hamiltonian with multiple exchange parameters, the development and evolution of magnetic Dirac nodes with both anisotropy and magnetic field are examined. From the classical energies, the phase diagrams for the ferromagnetic (FM), antiferrimagnetic (AfM), and the 120° phases are shown as functions of J1, J2, J3, and anisotropy. Furthermore, the production of bosonic Dirac and Weyl nodes in the spin‐wave spectra is shown. Through frustration of the magnetic geometry, a connection to the asymmetric properties of the Kagome lattice and the various antiferromagnetic configurations is discerned. Most interesting is the 120° phase, which does not have Dirac nodes when considering only J1 due to the formation of an analogous antiferromagnetic honeycomb lattice, but gains Dirac symmetry with next‐nearest neighbor interactions. Additionally, the presence of flat modes that are characteristic of cluster excitations is shown. Further study of external frustrations from a magnetic field and anisotropy reveals a tunability of the exchange interactions and nodal points. [ABSTRACT FROM AUTHOR]

A novel PtSnNa/ZSM‐5 monolithic catalyst was designed and synthesized for the propane dehydrogenation reaction, which was a significant transformation in industry. Experimental results showed that although the propane conversion and the propylene selectivity gradually fell down along with the reaction time, the descent speed of the PtSnNa/ZSM‐5 monolithic catalyst was slower than that of the granule catalyst and the propane conversion and propylene selectivity of the reaction with monolithic catalyst still remained at a high level after 12 hr. The monolithic catalyst had regular pore structure that facilitated the separation of the product from the catalyst and reduced the limitation on internal and external diffusion and mass transfer, and led to the high catalytic activity and stability. The catalyst could be easily fabricated and was of highly industrial application potential. [ABSTRACT FROM AUTHOR]

The understanding of growth mechanism at atomic scale is a key issue for realizing wafer‐scale, high‐quality 2D materials, in which their interfaces play a crucial role. Here, the adsorption and the aggregation of group VA elements within the first layer on Au(111) are investigated. Together with recent results for group VA elements on Cu and Ag(111), this study leads to a comprehensive understanding of the interfacial effects on the surface structures. Blue phosphorene forms the typical (4 × 4) honeycomb structure on Au(111) regardless of the coverage. Sb assembles into multiple intermediate phases comprising dimer pairs and coin‐shaped aggregates depending critically on the coverage. Increasing the coverage and annealing temperature converts these dimer pairs to AuSb2 surface alloy. The (37 × 37) honeycomb structure and (5 × 3) periodic stripes are the most stable of Bi on Au(111). Notably, neither P nor Bi prefers surface alloy under the similar growth conditions even though they have the smaller and larger atomic radius, higher and lower electronegativity than Sb, respectively. This difference is correlated with the relativistic effect that tightly bound inner 6s2 electrons make Bi inert. These model systems provide guidance framework for selection of elements and substrates to synthesize monoelemental and binary 2D materials. [ABSTRACT FROM AUTHOR]

Superhoneycomb lattice is an edge‐centered honeycomb lattice that represents a hybrid fermionic and bosonic system. It contains pseudospin‐1/2 and pseudospin‐1 Dirac cones, as well as a flat band in its band structure. In this paper, we cut the superhoneycomb lattice along short‐bearded boundaries and obtain the corresponding band structure. The states very close to the Dirac points represent approximate Dirac cone states that can be used to observe conical diffraction during light propagation in the lattice. In comparison with the previous literature, this research is carried out using the continuous model, which brings new results and is simple, direct, accurate, and computationally efficient. [ABSTRACT FROM AUTHOR]

Vibration in mechanical equipment can serve as a sustainable energy source to power sensors and devices if it can be effectively collected. In this work, a honeycomb structure inspired triboelectric nanogenerator (HSI‐TENG) consisting of two copper electrode layers with sponge bases and one honeycomb frame filled with polytetrafluoroethylene (PTFE) balls is proposed to harvest vibration energy. The application of a compact honeycomb structure increases the maximum power density of HSI‐TENG by 43.2% compared to the square grid structure and provides superior advantages in large‐scale manufacturing. More importantly, the nonspring‐assisted HSI‐TENG can generate electricity once the PTFE balls obtain sufficient kinetic energy to separate from the bottom electrode layer regardless of the vibration frequency and direction. This is fundamentally different from the spring‐assisted harvesters that can only work around their natural frequencies. The vibration model and working criteria of the HSI‐TENG are established. Furthermore, the HSI‐TENG is successfully used to serve as a self‐powered sensor to monitor engine conditions by analyzing the electrical output of the HSI‐TENG installed on a diesel engine. Therefore, the nonspring‐assisted HSI‐TENG provides a novel strategy for highly effective vibration energy harvesting and self‐powered machinery monitoring. [ABSTRACT FROM AUTHOR]

In lots of lightweight applications, constructions are also made by honeycomb sandwiches but little is known about failure and dynamic behavior of sandwich plate connections. In this research, an experimental and simulation study of the mechanical and failure behavior of honeycomb sandwich plates and joints are performed. In detail, series of tensile test have been conducted under quasi static conditions and failure behavior and resistance of the specimens are investigated. The specimens are made by phenolic resin-impregnated aramid paper as core and two different layers of glass fiber reinforced plastic as face sheets in each side. In addition to the experimental tests, numerical simulation with finite element models are performed in Abaqus. Failure modes are investigated and finally a good agreement between test data and simulation results is achieved. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

The deceptively simple tin selenide (SnSe) film has emerged as an appealing 2D material with a narrow bandgap, high charge carrier mobility, and significant thermoelectric figure of merit. In particular, compared with most commonly investigated 2D materials, SnSe with a puckered honeycomb structure possesses a lower lattice symmetry, resulting in prominent in‐plane anisotropy. Herein, with polarization‐dependent Raman spectroscopy and polarization‐dependent nonlinear absorption measurements, pronounced polarization‐dependent nonlinear optical properties of a SnSe flake are demonstrated originating from the anisotropic optical transition probability of SnSe, which is confirmed by ultrafast polarization‐dependent pump–probe experiments. Furthermore, a novel SnSe‐based all‐optical switch is proposed and experimentally explored. Specifically, due to the polarization‐dependent nonlinear optical response of SnSe, this all‐optical switch can access the "ON" and "OFF" modes of continuous‐wave signal light (633 nm, 13 µW) by altering the polarization of the switching light (800 nm, 65 fs, 1 kHz, 34 GW cm−2), rather than modifying its intensity, achieving an unexpectedly high ON/OFF ratio (the difference of the normalized transmittance of signal light between "ON" and "OFF" modes) of 44%. This work opens up real perspectives for versatile optoelectronic devices based on SnSe materials. [ABSTRACT FROM AUTHOR]

The entanglement of hard‐core bosons in square and honeycomb lattices with nearest‐neighbor interactions is estimated by means of quantum Monte Carlo (QMC) simulations and spin‐wave (SW) analysis. The particular U(1)‐invariant form of the concurrence is used to establish a connection with observables, such as density and superfluid density. For specific regimes, the concurrence is expressed as a combination of boson density and superfluid density. [ABSTRACT FROM AUTHOR]

Porous graphene‐based composites offer immense potential for microwave absorption because of their light weight and high performance. In this work, a honeycomb structure filled with porous graphene is demonstrated with excellent radar‐absorbing properties. This graphene‐based composite reaches the maximum reflection loss (RL) of −15 dB at 8.8 GHz with only a thickness of 4.0 mm and an areal density of 0.26 kg m−2. Raman spectroscopy confirms the existence of graphene and scanning electron microscopy images reveal how these large graphene flakes are arranged to a three‐dimensional porous structure. In addition, a monolithic porous graphene aerogel, without the honeycomb core, and a RL simulation of it are also investigated for comparison, which reveals antipodal properties. This work shows that the insulated honeycomb structure increases the surface characteristic impedance of the whole composite material, which mainly contributes to the reduction of total reflection from the interface. Various structural influence factors have been analyzed, the results provide a new idea for exploring high‐performance microwave absorbers of graphene‐based materials. [ABSTRACT FROM AUTHOR]

Cover Feature: Sulfonylamide-Based Ionic Liquids for High-Voltage Potassium-Ion Batteries with Honeycomb Layered Cathode Oxides (ChemElectroChem 15/2019) Keywords: potassium-ion batteries; ionic liquids; bis(trifluorosulfonyl)amide; high-voltage; honeycomb layered oxides Electrochemical measurements reveal a wide voltage tolerance, indubitably suggesting KTFSA-based ionic liquids as potent and stable electrolytes for high-voltage cathode materials (such as the honeycomb layered tellurates) for high-performance potassium-ion batteries. [Extracted from the article]

Epoxy film adhesives are of prime importance for the fabrication of lightweight honeycomb structures for aerospace industries. This work involves the synthesis of oxazolidinone modified epoxy novolac resin (EPN‐OXA) via the reaction of EPN and toluene diisocyanate. EPN‐OXA was characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography, and epoxy equivalent weight. EPN‐OXA was blended with solid epoxy resin, polyethersulfone (PES) toughened liquid epoxy resin, dicyandiamide, and aluminum powder to fabricate a film adhesive curing at 170–180 °C. Effect of additives and curative on the adhesive property was studied to optimize the composition. Effect of PES on the optimized composition was studied in detail. The best composition exhibited lap shear strength of 370 ± 10 kgf cm−2 at 25 °C and the strength was retained to 75% at −196 °C and 52% at 120 °C. PES significantly enhanced the interfacial strength at different temperatures (~1.6‐fold at −196 and 25 °C and ~1.8‐fold at 120 °C). It also improved tensile strength and fracture toughness by 1.4‐ and 2‐fold, respectively. The toughening effect of PES was further confirmed by scanning electron microscopy images. PES marginally reduced the glass‐transition temperature and it exhibited no effect on thermal stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47520. [ABSTRACT FROM AUTHOR]

Nanostructure engineering has been proved to be an efficient approach for improving electrochemical properties for energy storage by accommodating volume changes, facilitating rapid mass transport paths, and enlarging ion storage sites and interfaces. The well‐designed fine nanostructures, unfortunately, are usually destroyed during long‐term cycles and ultimately lose their structural advantages. Herein, stimulated by the extraordinary structural stability, robust mechanical properties, and salient ventilation capacity of natural honeycomb species, bioinspired heterogeneous bimetallic Co–Mo oxide (CoMoOx) nanoarchitectures assembled from 2D nanounits are successfully fabricated via a molybdenum‐mediated self‐assembly strategy for improving the rate capability of electrochemical lithium storage devices. Owing to the robust structural stability and the ultrathin 2D wall structure, CoMoOx nanostructures present well‐maintained honeycomb‐like structure, rapid capacitive insertion–desertion behaviors, and thus significantly enhanced lithium ion storage performance at high rates (5.0 A g−1). It is also revealed that the reversible transition of cobalt and molybdenum phases closely associated with the ultrathin 2D wall structures greatly contribute to the outstanding electrochemical lithium storage performances. This attractive integration of structural and functional advantages achieved by learning from nature offers new insights into the design of cost‐effective electrode materials for high‐performance energy devices. [ABSTRACT FROM AUTHOR]

Two‐dimensional (2D) transition‐metal halides have attracted great interest owing to their versatile applications in electronics, optoelectronics, and renewable energy storage/conversions. Using first‐principles calculations, it is proposed that a new series of 2D transition‐metal halide CdX (X = F, Cl, Br, and I) monolayers with honeycomb lattice structure show topological properties. When omitting the spin–orbital coupling (SOC) effect, all of them behave as Dirac semimetal whose Fermi surface is composed of two Dirac points at high symmetry K and K' points in Brillouin zone. When considering the SOC effect, CdCl, CdBr, and CdI monolayers behave as topological insulators with global band gap, whereas CdF is converted from Dirac semimetal into topological metal with local band gap. The nontrivial topological properties are further proved by their nontrivial edge states. The fascinating properties of the CdX (X = F, Cl, Br, and I) monolayers show their potential for future quantum computing and next generation of high‐speed electronic devices. [ABSTRACT FROM AUTHOR]

"Inverse emulsion"‐"breath figures" (Ie‐BF) method was introduced for fabricating porous films with protein arrays decorating the interior of the obtained polymeric pores. Compared with the traditional BF method in which only hydrophobic or amphiphilic components could be used, Ie‐BF method created a system with water phase carrying water‐soluble protein before solution casting, which makes it possible to obtain patterned protein arrays within the BF structure in one‐step. The stability of the inverse emulsion system is an intractable problem solved by high shearing emulsification. Experimental parameters, including the concentration of the matrix polymer, water/oil ratio of the IE, amount of both emulsifier and protein in IE, were evaluated for establishing an optimal condition to prepare fine BF arrays by following the Ie‐BF method. Proteins tagged with fluorescein isothiocyanate were added into the emulsion to cast films, and pores efficiently enriched by proteins were revealed by the images of fluorescence microscope, indicating the successful preparation of protein arrays. Among all the approaches of establishing patterned structures of biomacromolecules, Ie‐BF shows promising potential in future applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47084. [ABSTRACT FROM AUTHOR]

Cordierite honeycomb ceramics are sintered under a range of sintering atmosphere and temperature conditions. The linear thermal expansion coefficient (CTE) is measured along the extrusion direction. The samples sintered in an enclosed crucible have a much lower CTE than those sintered in open air. The CTE decreases with increasing sintering temperature up to 1450 °C. The polymorphic phases, texture, amorphous phase, impurity crystals, and porosity are analyzed using scanning electron microscopy, HR‐TEM, porosimeter, and Rietveld refinement method. The sintered samples consist of two polymorphic phases: indialite (hexagonal symmetry) and cordierite (orthorhombic symmetry). Both the volume % of the cordierite phase and the crystal texture increase with increasing sintering temperature. The orthorhombic distortion of cordierite from the hexagonal lattice (indialite) increases with increasing sintering temperature. The characteristic six‐membered ring of the (Si,Al)‐O4 tetrahedra in the cordierite structure shows substantial changes in the bond length due to Al‐Si ordering. Amorphous phase and impurity crystal phases such as silimanite and spinel remain at temperatures as high as 1450 °C. The effect of the polymorphic phases, the degree of texture, amorphous phase, impurity crystal phases, and the orthorhombic distortion is discussed in relation to the CTE characteristics of honeycomb. The sintered honeycomb consists of two polymorphic phases, indialite (hexagonal symmetry) and cordierite (orthorhombic symmetry). The volume % of cordierite phase and the crystal texture increase with increasing sintering temperature. The thermal expansion coefficient (CTE) reduces with the sintering temperature. The orthorhombic distortion originates from Al‐Si ordering. Amorphous and silimanite phases are ascribed to higher CTEs of the samples sintered in open air. [ABSTRACT FROM AUTHOR]

Silicene, the graphene‐like allotrope of silicon, has a great potential for the development of novel silicon‐based nanotechnologies. Its unique buckling makes the atomic structure of this silicon 2D material particularly flexible and tunable. The nanomechanical properties of silicene are investigated by probing epitaxial silicene on ZrB2 by atomic‐resolution noncontact atomic force microscopy. Δf–distance curve and scan direction dependence of topographic images point out, respectively, the out‐of‐plane and in‐plane flexibility of the Si honeycomb structure. A contrast visible only in dissipation images reveals the stress distribution across the periodic domain structure texturing the silicene sheet. The nanomechanical flexibility of silicene, a 2D allotrope of silicon is revealed by nc‐AFM. The contrast in dissipation images demonstrates stress distribution across the periodic domains texturing the spontaneously formed epitaxial silicene sheet on ZrB2. This unique ability to visualize stresses manifests itself in the revelation of symmetry breaking in silicene between alternating domains, which is invisible in topographic images. [ABSTRACT FROM AUTHOR]

The picture shows regular and hierarchical honeycombs with one and two degrees of hierarchy. Hierarchical honeycombs have superior performance compared to the regular honeycomb of equal mass. More details can be found in the article 1800036 by Ashkan Vaziri and co‐workers. [ABSTRACT FROM AUTHOR]

This article provides a comprehensive review of recent research efforts on the development and characterization of sandwich structures with corrugated, honeycomb, and foam cores. The topics discussed in this review article include aspects of core‐face bonding and reinforcement, enhancement of core mechanical properties and panel performance (including the role of structural hierarchy), and multifunctional advantages offered by different core constructions. In addition, the review discusses potential applications, including in morphing wing design, impact resistance, and ultralightweight applications. Future research directions are discussed. This article provides a comprehensive review of the current state of the art of sandwich structures including corrugated sandwich structures, honeycomb sandwich structures, and foam sandwich structures. The topics mainly consist of core‐face bonding and reinforcement, enhancement of core mechanical properties and panel performance, and tailoring properties for each core type. [ABSTRACT FROM AUTHOR]

Pristine ZnO nanostructures (NSs) are less sensitive to deep UV radiations, which restrict their usage to near UV region only. In order to extend its usability in deep UV region; Zn interstitial rich honeycomb (HC) NSs of ZnO is developed. The device shows remarkably high photoresponsivity of 1150 A W−1 in deep UV region (λ = 254 nm). Additionally, enhanced deep UV photosensitivity is observed and can be attributed to the incorporation of Zn ions in ZnO lattice and large surface to volume ratio of HC NSs. Furthermore, in dark conditions, the width of the depletion region is comparable to the thickness of HC NSs (20 nm) that results in complete depletion of charge carriers in NSs, which results in significant reduction in dark current. Moreover, HC NSs are provided continuous conduction path which eliminates the potential barrier forming at the NSs interfaces, resulting in efficient charge transportation. The measured photocurrent to dark current ratio is as large as ≈6 orders of magnitude. Such large photosensitivity in the deep UV region of electromagnetic spectrum makes these devices a promising candidate for development of deep UV photo‐detectors for commercial applications. High responsivity deep UV photo‐detector is fabricated by exploiting prominent deep UV absorption of Zinc interstitials, large surface to volume ratio and high electron transportation efficiency of ZnO honey comb nanostructures. The device shows significantly high photo current to dark current ratio of 6 order and photo‐responsivity of 1160 A W−1. [ABSTRACT FROM AUTHOR]

Materials that can simultaneously achieve excellent electrical conductivity and stretchability are essential components for the next‐generation stretchable electronics. Herein, a highly conductive and stretchable graphene honeycomb (GHC) sandwich consisting of a porous GHC/polydimethylsiloxane (PDMS) composite core and ultrahigh‐density graphene foam/PDMS composite face sheets is rationally assembled. The GHCs prepared by a 3D printing technique possess a long‐range ordered hexagonal porous structure with an ultralow density of 3.25 mg cm−3 and deliver an excellent electrical conductivity of 72 S m−1. To the best of authors' knowledge, they are the lightest honeycomb structure reported in open literature. The highly porous GHC core endows the sandwich with an ultralow resistance change over large external strains of 60% with excellent structural durability. A stretchable light‐emitting display is demonstrated using the sandwich as the electric circuit and light‐emitting diodes as the pixels, which exhibits reliable lighting performance under different loading conditions. A highly conductive and stretchable graphene honeycomb (GHC) sandwich is assembled using a porous GHC/polydimethylsiloxane (PDMS) composite core and ultrahigh‐density graphene foam/PDMS composite face sheets. The ultralight but highly conductive GHC possesses a long‐range ordered hexagonal porous structure achieved by a 3D printing technique, giving the sandwich exceptional stretchability and reliable electronic performance in stretchable electronics. [ABSTRACT FROM AUTHOR]

Single crystals of new complex manganese vanadate materials are hydrothermally synthesized and characterized by single crystal XRD and magnetic measurements. [ABSTRACT FROM AUTHOR]

Na3Co2SbO6 is prepared by calcination of stoichiometric amounts of Na2CO3, Co3O4, and Sb2O3 in air (1. [ABSTRACT FROM AUTHOR]

A novel broadband microwave absorber design concept using a honeycomb sandwich structure is proposed. Unlike the conventional microwave absorbing honeycomb sandwich structure, the newly proposed design concept uses the transverse direction of a honeycomb structure with a coated lossy material. When the incident waves reach the inside of the honeycomb coated with the lossy material, multiple scattering occurs inside the honeycomb due to the two different refractive indices. Then, the trapped electromagnetic (EM) waves lose energy due to the coated lossy walls. Thus, the honeycomb structure can be used in the transverse direction and the effective thickness in terms of the incident EM waves becomes very large. This considerable thickness represents a very effective way to sufficiently attenuate the trapped waves. This way, a lightweight and broadband absorber could be implemented without use of a magnetic material and without any limitations on the thickness. [ABSTRACT FROM AUTHOR]

No abstract is available for this article. [ABSTRACT FROM AUTHOR]

2D boron has been proposed to follow a honeycomb grid when deposited on a metal surface. However, in their Communication on page 13022 ff., B. I. Yakobson et al. show theoretically that pure boron is the first 2D material that varies its structure depending on the metal substrate: on Cu, Au, or Ag different boron sheets should be formed making it different from 2D graphene or hexagonal boron nitride which have an exclusively honeycomb lattice when deposited on different metal substrates. [ABSTRACT FROM AUTHOR]

Macroporous Ge powder is prepared by reduction of commercial GeO2 with Mg under hydrothermal conditions (autoclave, 200 °C, 5 h). [ABSTRACT FROM AUTHOR]

On page 4195 J. Kamei and H. Yabu create a super‐repellent surface with programmable wetting property that enables the collection of liquid droplets, transport along a pre‐programmed path, and manipulation on‐demand. This new technology opens the path for a new generation of omniphobic surfaces with potential application as antifouling medical coatings, water harvest and transport technology, and on‐demand 2D microfluidic for lab‐on‐a‐chip. [ABSTRACT FROM AUTHOR]

Single crystals of Pb2(BO3)(NO3) are prepared by hydrothermal reaction of Pb(NO3)2 and Mg(BO2)2 at pH 5.0-5.5 (autoclave, 210 °C, 4 d; 85% yield). [ABSTRACT FROM AUTHOR]

Review: 34 refs. [ABSTRACT FROM AUTHOR]

The title compounds are prepared by deintercalation of Na3Ni2BiO6 and characterized by powder XRD, single crystal XRD, and magnetic measurements. [ABSTRACT FROM AUTHOR]

On page 7241 L. P. Heng, L.‐Z. Fan, B.‐Z. Tang, and co‐workers demonstrate photoelectric cooperative induced patterned wetting on a hydrophobic ordered polymeric honeycomb structure surface, which is prepared by the breath figure method; finally, photoelectric cooperative induced patterned wetting is used for liquid reprography. [ABSTRACT FROM AUTHOR]