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Xin Chen, Yang Xu, Meimei Liang, Qinfei Ke, Yuanyuan Fang, He Xu, Xiangyu Jin, Chen Huang
Nanofiber nonwoven filters, especially those prepared by electrospinning, are of particular interest because of their high filtration efficiency. However, existing electrospun filters suffer from inherent limitations in that both strengths and filtration resistances of the filters leave much to be desired. Herein, we present a novel nonwoven filter that is composed of polysulphone and polyurethane nanofibers. By mimicking the honeycomb structure, a heterogeneous distribution of both fiber diameter and fiber density has been achieved...
January 8, 2018: Journal of Hazardous Materials
Qiangqiang Zhang, Feng Zhang, Xiang Xu, Chi Zhou, Dong Lin
It is a significant challenge to concurrently achieve scalable fabrication of graphene aerogels with three-dimensional (3D) tailorable architectures (e.g., lattice structure) and controllable manipulation of microstructures on the multiscale. Herein, we highlight 3D graphene lattices (GLs) with complex engineering architectures that were delicately designed and manufactured via 3D stereolithography printed hollow polymer template-mediated hydrothermal process coupled with freeze-drying strategies. The resulting GLs with overhang beams and columns show a 3D geometric configuration with hollow-carved features at the macroscale, while the construction elements of graphene cellular on the microscale exhibit a well-ordered and honeycomb-like microstructure with high porosity...
January 12, 2018: ACS Nano
Irina Alexandra Paun, Roxana Cristina Popescu, Cosmin Catalin Mustaciosu, Marian Zamfirescu, Bogdan Stefanita Calin, Mona Mihailescu, Maria Dinescu, Andrei Popescu, Diana Georgiana Chioibasu, Mihai Sopronyi, Catalin Luculescu
A major limitation of existing 3D implantable structures for bone tissue engineering is that most of the cells rapidly attach on the outer edges of the structure, restricting the cells penetration into the inner parts and causing the formation of a necrotic core. Furthermore, these structures generally possess a random spatial arrangement and do not preserve the isotropy on the whole volume. Here, we report on the fabrication and testing of an innovative 3D hierarchical, honeycomb-like structure (HS), with reproducible and isotropic arhitecture, that allows "in volume" migration of osteoblasts...
January 12, 2018: Biofabrication
Anne-Marie Pobloth, Sara Checa, Hajar Razi, Ansgar Petersen, James C Weaver, Katharina Schmidt-Bleek, Markus Windolf, Andras Á Tatai, Claudia P Roth, Klaus-Dieter Schaser, Georg N Duda, Philipp Schwabe
Three-dimensional (3D) titanium-mesh scaffolds offer many advantages over autologous bone grafting for the regeneration of challenging large segmental bone defects. Our study supports the hypothesis that endogenous bone defect regeneration can be promoted by mechanobiologically optimized Ti-mesh scaffolds. Using finite element techniques, two mechanically distinct Ti-mesh scaffolds were designed in a honeycomb-like configuration to minimize stress shielding while ensuring resistance against mechanical failure...
January 10, 2018: Science Translational Medicine
Hyun-Jun Lee, Hyeong-Ju Kim, Eung-Chang Lee, Jaekwan Kim, Soo Young Park
A highly fluorescent (ΦF = 0.60) and water-soluble two-dimensional (2D) honeycomb-shaped supramolecular organic framework (SOF) was successfully synthesized in pure aqueous solution via self-assembly of novel cyanostilbene-functionalized trilateral guest molecules and cucurbit[8]uril hosts. Size of this fluorescent 2D SOF was over 500 nm in diameter, 1.7 nm in thickness, and 3.9 nm in the honeycomb pore diameter. This 2D SOF showed a promising potential as a new all-organic photosensitizer template for photocatalytic H₂ evolution from pure water...
January 10, 2018: Chemistry, An Asian Journal
Zhi Chang, Bing Ding, Hui Dou, Jie Wang, Guiyin Xu, Xiaogang Zhang
As one of the most promising energy storage devices, the practical application of lithium-sulfur batteries is limited by the low electrical conductivity of sulfur and the notable "shuttle effects" of sulfur-based electrodes. In this work, we describe a hierarchically porous N-doped ZIF-8-derived carbon nanosphere (N-ZDC) with an outer shell and an inner honeycomb-like interconnected nanosheets network as sulfur host material for high-performance and long-term lithium-sulfur batteries. The N-ZDC serves as multilayered barriers against the dissolution of lithium polysulfides...
January 9, 2018: Chemistry: a European Journal
Harini Gunda, Saroj Kumar DAS, Kabeer Jasuja
Layered metal diborides that contain metal atoms sandwiched in between boron honeycomb planes offer a rich opportunity to access graphenic forms of boron. We have recently demonstrated that Magnesium diboride (MgB₂) can be exfoliated by ultrasonication in water to yield boron-based nanosheets. However, the knowledge on the fate of metal boride crystals in an aqueous phase is still in its incipient stages. This work presents our preliminary findings on the discovery that MgB₂ crystals can undergo dissolution in water under ambient conditions to result in precursors, which upon aging, undergo a non-classical crystallization preferentially growing in lateral directions by two-dimensional (2D) oriented attachments...
January 3, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Tutul Biswas, Tarun Kanti Ghosh
We consider the $\alpha$-$T_3$ model which provides a smooth crossover between the honeycomb lattice with pseudospin $1/2$ and the dice lattice with pseudospin $1$ through the variation of a parameter $\alpha$. We study the dynamics of a wave packet representing a quasiparticle in the $\alpha$-T$_3$ model with zero and finite transverse magnetic field. For zero field, it is shown that the wave packet undergoes a transient $zitterbewegung$ (ZB). Various features of ZB depending on the initial pseudospin polarization of the wave packet have been revealed...
January 9, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Yi Ding, Yanli Wang
Utilizing first-principles calculations, we have systematically investigated the structural stabilities and electronic properties of XYBe3 (XY = BN, AlN, SiC, and GeC) nanosheets, which are isoelectronic analogues to the recently proposed Be3C2 nanosheet [B. Wang, et al., Nanoscale, 2017, 9, 5577]. These XYBe3 nanosheets have flat honeycomb lattice like graphene and can be viewed as amplified XY nanostructures with Be intercalation. Akin to their XY counterparts, the XYBe3 nanosheets also possess robust dynamical and thermal stabilities...
January 5, 2018: Physical Chemistry Chemical Physics: PCCP
Yaroslav V Kartashov, Dmitry V Skryabin
The functionality of many nonlinear and quantum optical devices relies on the effect of optical bistability. Using microcavity exciton-polaritons in a honeycomb arrangement of microcavity pillars, we report the resonance response and bistability of topological edge states. A balance between the pump, loss, and nonlinearity ensures a broad range of dynamical stability and controls the distribution of power between counterpropagating states on the opposite edges of the honeycomb lattice stripe. Tuning energy and polarization of the pump photons, while keeping their momentum constant, we demonstrate control of the propagation direction of the dominant edge state...
December 22, 2017: Physical Review Letters
Yang Yang, Ruiqi Zhao, Tengfei Zhang, Kai Zhao, Peishuang Xiao, Yanfeng Ma, Pulickel M Ajayan, Gaoquan Shi, Yongsheng Chen
Harvesting solar energy for desalination and sewage treatment has been considered as a promising solution to produce clean water. However, state-of-the-art technologies often require optical concentrators and complicated systems with multiple components, leading to poor efficiency and high cost. Here we demonstrate an extremely simple and standalone solar energy converter consisting of only an as-prepared 3D cross-linked honeycomb graphene foam material without any other supporting components. Remarkably this simple all-in-one material can act as an ideal solar-thermal converter capable of capturing and converting sunlight into heat which in turn can distill water from various water sources into steam and produce purified water under ambient conditions and low solar flux with very high efficiency...
January 4, 2018: ACS Nano
Shenxiang Zhang, Gaoshuo Jiang, Shoujian Gao, Huile Jin, Yuzhang Zhu, Feng Zhang, Jian Jin
Developing an effective and sustainable solution for cleaning up or separating oily water is highly desired. In this work, we report a completely new inorganic mesh membrane made up of cupric phosphate (Cu3(PO4)2) in a special nanosheets-constructed honeycomb-like structure. Combing the unique hierarchical structure with strong hydration ability of Cu3(PO4)2, the nanosheets-wrapped membrane exhibits a superior superhydrophilic and underwater anti-oil fouling and anti-bio fouling property for efficient oil/water separation to various viscous oils such as heavy diesel oil, light crude oil, and even heavy crude oil with underwater oil contact angles (CAs) all above 158° and nearly zero underwater oil adhesive force even when a large preload force up to 400 μN applied on the oil droplet...
January 3, 2018: ACS Nano
Elhadji Barra Ndiaye, Hugues Duflo, Pierre Maréchal, Pascal Pareige
After identifying the parameters of the piezoelectric transducer, the mechanical impedance of the front medium is deduced. More particularly, the wave propagation velocity and attenuation are deduced in the inspected plate. By fitting the electrical impedance measurement results, the aging of composite materials is quantified, showing the effectiveness of this means of nondestructive evaluation. A specific measurement tool and protocol are proposed. Several estimators are identified on the basis of Gaussian fits of the resonances observed on the electrical impedance measurements...
December 2017: Journal of the Acoustical Society of America
Phoebe L Mellen, Kareem Sioufi, Jerry A Shields, Carol L Shields
PURPOSE: To report a patient with clinically invisible retinal astrocytic hamartomas (RAHs) detected on optical coherence tomography (OCT) and studied with OCT angiography (OCTA). METHOD: Case report. RESULTS: An 11-year-old healthy girl was evaluated for reduced visual acuity in the right eye. On examination, best-corrected visual acuity was 20/50 in the right eye and 20/20 in the left eye. Fundus examination revealed blunted foveal reflex in the right eye and normal findings in the left eye...
December 28, 2017: Retinal Cases & Brief Reports
Zhe Wang, S Reschke, D Hüvonen, S-H Do, K-Y Choi, M Gensch, U Nagel, T Rõõm, A Loidl
We report on terahertz spectroscopy of quantum spin dynamics in α-RuCl_{3}, a system proximate to the Kitaev honeycomb model, as a function of temperature and magnetic field. We follow the evolution of an extended magnetic continuum below the structural phase transition at T_{s2}=62  K. With the onset of a long-range magnetic order at T_{N}=6.5  K, spectral weight is transferred to a well-defined magnetic excitation at ℏω_{1}=2.48  meV, which is accompanied by a higher-energy band at ℏω_{2}=6...
December 1, 2017: Physical Review Letters
A Little, Liang Wu, P Lampen-Kelley, A Banerjee, S Patankar, D Rees, C A Bridges, J-Q Yan, D Mandrus, S E Nagler, J Orenstein
We report measurements of optical absorption in the zigzag antiferromagnet α-RuCl_{3} as a function of temperature T, magnetic field B, and photon energy ℏω in the range ∼0.3-8.3 meV, using time-domain terahertz spectroscopy. Polarized measurements show that threefold rotational symmetry is broken in the honeycomb plane from 2 to 300 K. We find a sharp absorption peak at 2.56 meV upon cooling below the Néel temperature of 7 K at B=0 that we identify as the magnetic-dipole excitation of a zero-wave-vector magnon, or antiferromagnetic resonance (AFMR)...
December 1, 2017: Physical Review Letters
P Lampen-Kelley, A Banerjee, A A Aczel, H B Cao, M B Stone, C A Bridges, J-Q Yan, S E Nagler, D Mandrus
The insulating honeycomb magnet α-RuCl_{3} exhibits fractionalized excitations that signal its proximity to a Kitaev quantum spin liquid state; however, at T=0, fragile long-range magnetic order arises from non-Kitaev terms in the Hamiltonian. Spin vacancies in the form of Ir^{3+} substituted for Ru are found to destabilize this long-range order. Neutron diffraction and bulk characterization of Ru_{1-x}Ir_{x}Cl_{3} show that the magnetic ordering temperature is suppressed with increasing x, and evidence of zizag magnetic order is absent for x>0...
December 8, 2017: Physical Review Letters
Linlin Xiao, John A Finlay, Michael Röhrig, Sophie Mieszkin, Matthias Worgull, Hendrik Hölscher, James A Callow, Maureen E Callow, Michael Grunze, Axel Rosenhahn
Surface topography plays a key role in the colonization of substrata by the colonizing stages of marine fouling organisms. For the innovation of marine antifouling coatings, it is essential to understand how topographic cues affect the settlement of these organisms. In this study, tapered, spiked microstructures and discrete honeycombs of varying feature dimensions were designed and fabricated in order to examine the influence of topography on the attachment of zoospores of the green macroalga Ulva linza and cells of the diatom (microalga) Navicula incerta...
December 28, 2017: Biofouling
M Elsayed Moussa, B Attenberger, E V Peresypkina, M Scheer
The reaction of the Pn ligand complex [Cp*Fe(η5-P5)] (1: Cp* = η5-C5Me5) with CuCl in the presence of 4,4'-bipyridine or 1,2-di(4-pyridyl)ethylene leads to the formation of three unprecedented neutral 2D organometallic-organic hybrid networks, the constitutional isomers [Cu2Cl2{Cp*Fe(μ3,η5:1:1-P5)}(μ,η1:1-C10H8N2)]n (2 and 3) and the coordination polymer [(CuCl)2{Cp*Fe(μ3,η5:1:1-P5)}(μ,η1:1-C12H10N2)]n (4) with isomeric square (2 and 3) and honeycomb (4) layer topologies.
December 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Tohid Farajollahpour, Arash Phirouznia
Real magnetic and lattice deformation gauge fields have been investigated in honeycomb lattice of graphene. The coexistence of these two gauges will induce a gap difference between two valley points (K and K') of system. This gap difference allows us to study the possible topological valley Hall current and valley polarization in the graphene sheet. In the absence of magnetic field, the strain alone could not generate a valley polarization when the Fermi energy coincides exactly with the Dirac points. Since in this case there is not any imbalance between the population of the valley points...
December 19, 2017: Scientific Reports
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