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https://read.qxmd.com/read/30888380/inorganic-organic-hybridization-induced-uniaxial-zero-thermal-expansion-in-mc-4-o-4-m-ba-pb
#1
Zhanning Liu, Kun Lin, Yang Ren, Kenichi Kato, Yili Cao, Jinxia Deng, Jun Chen, Xianran Xing
We report two inorganic-organic hybrid materials with pillar-layered architectures, BaC4O4 and PbC4O4, which show uniaxial zero thermal expansion (ZTE) along the hybrid direction over a wide temperature range. The local structure and lattice dynamic investigations reveal that the ZTE derives from the cooperation of the NTE of the inorganic Ba-O (or Pb-O) layer and the PTE of the squarate pillar.
March 19, 2019: Chemical Communications: Chem Comm
https://read.qxmd.com/read/30888362/quasi-layer-co-2-p-polarized-cu-3-p-nanocomposites-with-enhanced-intrinsic-interfacial-charge-transfer-for-efficient-overall-water-splitting
#2
Liangbin Liu, Lei Ge, Yuyang Sun, Binbin Jiang, Yafei Cheng, Lai Xu, Fan Liao, Zhenhui Kang, Mingwang Shao
The search for efficient, stable and low-cost electrocatalysts for water splitting is a big challenge faced by energy conversion systems. In this work, Cu3P-Co2P nanocomposites with numerous interfaces are employed as catalysts for water splitting in alkaline solution. The quasi-layer structure of Co2P and the polarized plane of Cu3P endow the nanocomposites with large surface areas and active sites, which substantially favors the intrinsic charge transfer and boosts the catalytic activity. In addition, Cu3P reduces the lattice mismatch between Co2P and nickel foam and then enhances the catalytic stability...
March 19, 2019: Nanoscale
https://read.qxmd.com/read/30888161/understanding-the-structure-and-ground-state-of-the-prototype-cuf-2-compound-not-due-to-the-jahn-teller-effect
#3
José Antonio Aramburu, Miguel Moreno
Insulating CuF2 is considered a prototype compound displaying a Jahn-Teller effect (JTE) which gives rise to elongated CuF6 4- units. By means of first-principles calculations together with an analysis of experimental data of both CuF2 and Cu2+ -doped ZnF2 , we demonstrate that such an idea is not correct. For ZnF2 :Cu2+ , we find that CuF6 4- units are compressed always along the Z local axis with a hole essentially in a 3 z2 - r2 antibonding orbital, in agreement with experimental EPR data that already underline the absence of a JTE...
March 19, 2019: Inorganic Chemistry
https://read.qxmd.com/read/30887807/collapse-of-lini1-x-ycoxmnyo2-lattice-at-deep-charge-irrespective-of-nickel-content-in-lithium-ion-batteries
#4
Wangda Li, Hooman Yaghoobnejad Asl, Qiang Xie, Arumugam Manthiram
Volume variation and the associated mechanical fracture of elec-trode materials upon Li extraction/insertion are a main cause limit-ing lifetime performance of lithium-ion batteries. For LiNi1-x-yCoxMnyO2 (NCM) cathodes, abrupt anisotropic collapse of the layered lattice structure at deep charge is generally considered char-acteristic to high Ni content and can be effectively suppressed by elemental substitution. Herein, we demonstrate the lattice collapse is a universal phenomenon almost entirely dependent on Li utilization, and not Ni content, of NCM cathodes upon delithiation...
March 19, 2019: Journal of the American Chemical Society
https://read.qxmd.com/read/30886809/the-role-of-chloride-incorporation-in-lead-free-2d-perovskite-ba-2-sni-4-morphology-photoluminescence-phase-transition-and-charge-transport
#5
Jun Wang, Hongzhi Shen, Wancai Li, Shuai Wang, Junze Li, Dehui Li
The incorporation of chloride (Cl) into methylammonium lead iodide (MAPbI3 ) perovskites has attracted much attention because of the significantly improved performance of the MAPbI3 -based optoelectronic devices with a negligible small amount of Cl incorporation. It is expected that the Cl incorporation in 2D perovskites with layered nature would be much more efficient and thus can greatly alter the morphology, optical properties, phase transition, and charge transport; however, studies on those aspects in 2D perovskites remain elusive up to date...
March 6, 2019: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://read.qxmd.com/read/30886793/atomic-scale-structural-modification-of-2d-materials
#6
REVIEW
Yao Xiao, Mengyue Zhou, Mengqi Zeng, Lei Fu
2D materials have attracted much attention since the discovery of graphene in 2004. Due to their unique electrical, optical, and magnetic properties, they have potential for various applications such as electronics and optoelectronics. Owing to thermal motion and lattice growth kinetics, different atomic-scale structures (ASSs) can originate from natural or intentional regulation of 2D material atomic configurations. The transformations of ASSs can result in the variation of the charge density, electronic density of state and lattice symmetry so that the property tuning of 2D materials can be achieved and the functional devices can be constructed...
March 6, 2019: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://read.qxmd.com/read/30886177/novel-catalytically-active-pd-ru-bimetallic-nanoparticles-synthesized-by-bacillus-benzeovorans
#7
Jacob B Omajali, Jaime Gomez-Bolivar, Iryna P Mikheenko, Surbhi Sharma, Bayonle Kayode, Bushra Al-Duri, Dipanjan Banerjee, Marc Walker, Mohamed L Merroun, Lynne E Macaskie
Bacillus benzeovorans assisted and supported growth of ruthenium (bio-Ru) and palladium/ruthenium (bio-Pd@Ru) core@shell nanoparticles (NPs) as bio-derived catalysts. Characterization of the bio-NPs using various electron microscopy techniques and high-angle annular dark field (HAADF) analysis confirmed two NP populations (1-2 nm and 5-8 nm), with core@shells in the latter. The Pd/Ru NP lattice fringes, 0.231 nm, corresponded to the (110) plane of RuO2. While surface characterization using X-ray photoelectron spectroscopy (XPS) showed the presence of Pd(0), Pd(II), Ru(III) and Ru(VI), X-ray absorption (XAS) studies of the bulk material confirmed the Pd speciation (Pd(0) and Pd(II)- corresponding to PdO), and identified Ru as Ru(III) and Ru(IV)...
March 18, 2019: Scientific Reports
https://read.qxmd.com/read/30884870/metal-ligand-recognition-index-determination-by-nmr-proton-relaxation-study
#8
Claudia Bonechi, Alessandro Donati, Gabriella Tamasi, Alessio Pardini, Vanessa Volpi, Gemma Leone, Marco Consumi, Agnese Magnani, Claudio Rossi
In this study, we developed and validated a new proposed parameter quantifying the interaction strength between natural and/or synthetic molecules with paramagnetic metal ions. The Metal ion Recognition Index, Miri , is a quantitative parameter to describe the proton environment and to define their involvement in the inner and/or outer sphere of the paramagnetic metal ion. The method is based on the analysis of NMR proton spin-lattice relaxation rates of a specific ligand in both the diamagnetic and paramagnetic conditions...
March 17, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30878513/influence-of-glass-forming-ability-on-the-physical-stability-of-supersaturated-amorphous-solid-dispersions
#9
Lasse Ingerslev Blaabjerg, Bulut Bulduk, Eleanor Lindenberg, Korbinian Löbmann, Thomas Rades, Holger Grohganz
In this study, the influence of the glass forming ability (GFA) of a drug on its physical stability in a supersaturated solid dispersion was investigated. Nine drugs were classified according to their GFA using their respective critical cooling rate. Their respective solubility in poly(vinylpyrrolidone-co-vinyl acetate) 6:4 (PVPVA64) was predicted using the melting point depression method based on the Flory-Huggins lattice theory. Supersaturated amorphous solid dispersions at a level of 25% w/w drug above saturation solubility in the polymer were prepared by film-casting and their respective physical stability at temperatures of 10 or 20 °C above or below their respective Tg (dry conditions) was monitored by the use of polarized light microscopy...
March 13, 2019: Journal of Pharmaceutical Sciences
https://read.qxmd.com/read/30877255/detecting-different-topologies-immanent-in-scale-free-networks-with-the-same-degree-distribution
#10
Dimitrios Tsiotas
The scale-free (SF) property is a major concept in complex networks, and it is based on the definition that an SF network has a degree distribution that follows a power-law (PL) pattern. This paper highlights that not all networks with a PL degree distribution arise through a Barabási-Albert (BA) preferential attachment growth process, a fact that, although evident from the literature, is often overlooked by many researchers. For this purpose, it is demonstrated, with simulations, that established measures of network topology do not suffice to distinguish between BA networks and other (random-like and lattice-like) SF networks with the same degree distribution...
March 15, 2019: Proceedings of the National Academy of Sciences of the United States of America
https://read.qxmd.com/read/30876342/effective-diffusivity-of-microswimmers-in-a-crowded-environment
#11
Marvin Brun-Cosme-Bruny, Eric Bertin, Benoît Coasne, Philippe Peyla, Salima Rafaï
The microalga Chlamydomonas Reinhardtii is used here as a model system to study the effect of complex environments on the swimming of micro-organisms. Its motion can be modeled by a run and tumble mechanism so that it describes a persistent random walk from which we can extract an effective diffusion coefficient for the large-time dynamics. In our experiments, the complex medium consists of a series of pillars that are designed in a regular lattice using soft lithography microfabrication. The cells are then introduced in the lattice, and their trajectories within the pillars are tracked and analyzed...
March 14, 2019: Journal of Chemical Physics
https://read.qxmd.com/read/30876274/exploring-optical-resonances-of-nanoparticles-excited-by-optical-skyrmion-lattices
#12
Qiang Zhang, Zhenzhen Liu, Feifei Qin, Shang Jie Zeng, Dasen Zhang, Zhiyuan Gu, Xiangli Liu, Jun-Jun Xiao
Recently, optical Skyrmion lattices (OSLs) have been realized in evanescent electromagnetic fields. OSLs possess topologically stable field configurations, which promise many optics and photonics applications. Here, we demonstrate that OSLs can serve as versatile structured optical near-fields to assist with studies of a variety of photonic modes in nanoparticles. We firstly show that OSL is capable of selectively exciting electric and magnetic multipole modes by placing a nanoparticle at different positions in the lattice...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30876226/development-of-8-branch-er-fiber-frequency-comb-for-sr-and-yb-optical-lattice-clocks
#13
Yusuke Hisai, Daisuke Akamatsu, Takumi Kobayashi, Sho Okubo, Hajime Inaba, Kazumoto Hosaka, Masami Yasuda, Feng-Lei Hong
We demonstrate an 8-branch Er:fiber frequency comb with seven application ports, which can be individually optimized for applications with different wavelengths. The beat between the comb and a cw laser has a signal-to-noise ratio exceeding 30 dB at a resolution bandwidth of 300 kHz. The 8-branch frequency comb is used to perform frequency locking for four repumping and lattice lasers, and the frequency measurement of two clock lasers of strontium and ytterbium optical lattice clocks. We have achieved reliable optical lattice clock operation, thanks to the stable frequency locking and measurement obtained by using the 8-branch frequency comb...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30876217/asymmetric-conical-diffraction-in-dislocated-edge-centered-square-lattices
#14
Hua Zhong, Rong Wang, Milivoj R Belić, Yanpeng Zhang, Yiqi Zhang
We investigate linear and nonlinear evolution dynamics of light beams propagating along a dislocated edge-centered square lattice. The band structure and Brillouin zones of this novel lattice are analyzed analytically and numerically. Asymmetric Dirac cones as well as the corresponding Bloch modes of the lattice are obtained. By adopting the tight-binding approximation, we give an explanation of the asymmetry of Dirac cones. By utilizing the appropriate Bloch modes, linear and nonlinear asymmetric conical diffraction are demonstrated...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30876214/localization-and-anderson-delocalization-of-light-in-fractional-dimensions-with-a-quasi-periodic-lattice
#15
Changming Huang, Ce Shang, Jing Li, Liangwei Dong, Fangwei Ye
We address the properties of wavepacket localization-delocalization transition (LDT) in fractional dimensions with a quasi-periodic lattice. The LDT point, which is generally determined by the competition between two sub-lattices comprising the quasi-periodic lattice, turns out to be inversely proportional to the Lévy index. Surprisingly, we find that, in the presence of weak structural disorder, anti-Anderson localization occurs, i.e., the introduced disorder results in an increasing of the size of the linear modes...
March 4, 2019: Optics Express
https://read.qxmd.com/read/30876124/a-simple-analytical-model-for-confinement-loss-estimation-in-hollow-core-tube-lattice-fibers
#16
Luca Vincetti, Lorenzo Rosa
In this work, we propose an analytical model for estimating confinement loss in Tube Lattice Fibers. It is based on the single-tube model and the inhibited coupling waveguiding mechanism. The comparison with numerical simulations of tube lattice fibers having different geometrical parameters and dielectric refractive indexes demonstrates the model validity and effectiveness. Being based only on analytical closed formulas, it constitutes a useful tool for rapid estimation of TLF CL. It also gives a more in-depth insight into the TLF guiding mechanisms, confirming the inhibited coupling is an appropriate and effective model for such kind of fibers...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30876104/two-classes-of-singularities-and-novel-topology-in-a-specially-designed-synthetic-photonic-crystals
#17
Qiucui Li, Yu Zhang, Xunya Jiang
Zak phase and topological protected edge state are usually studied in one-dimensional (1D) photonic systems with spatial inversion symmetry (SIS). In this work, we find that specific classes of 1D structure without SIS can be mapped to a system with SIS and also exhibit novel topology, which manifest as phase cut lines (PCLs) in our specially designed synthetic photonic crystals (SPCs). Zak phase defined in SIS is extended to depict the topology of PCLs after redefinition, and a topological protected edge state is also achieved in our 1D structure without SIS...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30876061/anderson-localization-in-synthetic-photonic-lattice-with-random-coupling
#18
Artem V Pankov, Ilya D Vatnik, Dmitry V Churkin, Stanislav A Derevyanko
A synthetic photonic lattice (SPL) is a re-configurable test-bed for studying the dynamics of one-dimensional mesh lattices including the photonic implementations of discrete time quantum walks. Unlike other realizations of photonic lattices, SPL possesses easy and fast control of lattice parameters. Here we consider disordered SPL where the coupling ratio between the two fiber loops realizing the lattice is random but does not change between the round trips. We obtain a new analytical result for the localization length (inverse Lyapunov exponent) for a practical case of weak coupling disorder...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30876031/creation-of-optical-speckle-by-randomizing-a-vortex-lattice
#19
A Balbuena Ortega, S Bucio-Pacheco, S Lopez-Huidobro, L Perez-Garcia, F J Poveda-Cuevas, J A Seman, A V Arzola, K Volke-Sepúlveda
We investigate the number of vortices embedded in a carrier beam needed to produce a speckle pattern and the necessary conditions in terms of their initial distribution and topological charges. A spatial light modulator is used to imprint arrays of vortices in a Gaussian beam, which is propagated in free space for a given distance and then focused in order to induce interaction among the vortices in the focal region. The resulting optical field is analyzed after propagation up to a transverse plane where the carrier beam would recover its initial size in the absence of vortices...
February 18, 2019: Optics Express
https://read.qxmd.com/read/30875991/combustion-synthesis-of-non-precious-cuo-ceo%C3%A2-nanocrystalline-catalysts-with-enhanced-catalytic-activity-for-methane-oxidation
#20
Abdallah F Zedan, Amina S AlJaber
In this study, xCuO-CeO₂ mixed oxide catalysts (Cu weight ratio x = 1.5, 3, 4.5, 6 and 15 wt.%) were prepared using solution combustion synthesis (SCS) and their catalytic activities towards the methane (CH₄) oxidation reaction were studied. The combustion synthesis of the pure CeO₂ and the CuO-CeO₂ solid solution catalysts was performed using copper and/or cerium nitrate salt as an oxidizer and citric acid as a fuel. A variety of standard techniques, including scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to reveal the microstructural, crystal, thermal and electronic properties that may affect the performance of CH₄ oxidation...
March 15, 2019: Materials
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