An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Journal Article Nanoscale materials for information storage Get access A K Petford-Long, A K Petford-Long Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK Search for other works by this author on: Oxford Academic Google Scholar P Shang, P Shang IBM Storage Division , 5600 Cottle Road, San Jose, CA 95193, USA Search for other works by this author on: Oxford Academic Google Scholar Y G Wang, Y G Wang Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK Search for other works by this author on: Oxford Academic Google Scholar N Owen N Owen Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK Search for other works by this author on: Oxford Academic Google Scholar Microscopy and Microanalysis, Volume 8, Issue S02, 1 August 2002, Pages 296–297, https://doi.org/10.1017/S1431927602100808 Published: 01 August 2002
Coordination polymers (CPs) have recently emerged as promising candidates for heterogeneous photocatalysis due to their structural designability and tunable properties. Herein, we developed two novel Ag(I)-calix[4]arene coordination polymers with the formula {[Ag2(μ-NO3)L1]}n (CP 1) and {[AgL1]·PF6}n (CP 2) (L1 = 2-mercapto-5-methyl-1,3,4-thiadiazole resorcinol calix[4]arene). Crystallography revealed that anion coordination and self-inclusion behavior induced the cavitand and silver ions to self-assemble into well-defined CPs 1 and 2 with different topological coordination frameworks, respectively. Furthermore, CPs 1 and 2 display high photocatalytic activity for the photodegradation of rhodamine B (RhB) and methyl orange (MO) in an aqueous solution under mild conditions (WLED and UV irradiation). The comparison results demonstrate that CP 1 exhibited better photocatalytic performance than CP 2, which correlated well with the differences in their molecular structure and HOMO–LUMO energy gaps. The photocatalysis products and possible intermediates were successfully monitored and determined using mass spectrum, gas chromatography, and electron paramagnetic resonance measurements. The rational photocatalysis mechanism was further investigated and proposed.
Heterogeneous photocatalysts with high activity and reactive free radicals can be used to effectively remove water pollutants in harsh environments, which have attracted considerable attention in the environment chemistry. Here, we designed two conjugated organic porous polymers POPs 1-2 with high redox activity and potential π-electron delocalization. Upon combination with silver(I) nitride salt in solution, two metal-anchoring polymeric catalysts POPs 3-4 were successfully constructed, which possessed a strong electron donating ability as well as a high coplanarity and photoelectron properties. Through the loading of AgNO3, the carrier separation ability was effectively improved and the photocatalytic activity of POPs 3-4 was enhanced because of the surface plasmon resonance (SPR) effect of Ag localized at the polymer surface. The photocatalytic results demonstrated that POPs 3-4 could degrade RhB, MO and TC under visible light irradiation. The photodegradation efficiency reached 98% for RhB, 34.2% for Mo and 55.5% for TC with the presence of POPs 3-4. Furthermore, two porous polymer catalysts showed an excellent reusability in heterogenous conditions. A plausible photocatalytic mechanism triggered by ROS was proposed for the degradation of organic dyes. This work provided a possibility for development of the highly effective photocatalyst materials towards organic pollutants photodegradation under mild conditions.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Abstract The defect character of steps on lamellar γ-α2 interfaces in a quinternary TiAl-based alloy for which the misfit between the α2 and γ phases is less than 0.1 % has been studied using high-resolution transmission electron microscopy. The interfaces consisted of atomically flat coherent terraces separated by interfacial steps across which equal even numbers of {111}γ and (0002)α 2 planes match. It has been found that the diversity of step heights is greater than that reported previously for lamellar TiAl-based alloys. Circuit mapping was used to identify the Burgers vectors of these steps from lattice images obtained at [10l]γ and [l10]γ zone axes. It was found that the Burgers vectors exhibited by the steps varied with both the height and the sense of the step. In each case these Burgers vectors were consistent with the steps being perfect interfacial disconnections as described by Pond's topological theory of interfacial defects. The defect character of the steps and the occurrence of certain combinations of steps of opposite sense was used to infer that the γ lamellae in this alloy grow by a diffusion-controlled step migration mechanism rather than by the glide of partial dislocations as proposed previously.
It is well established that the response of devices based on the giant magnetoresistance (GMR) effect depends critically on film microstructure, with parameters such as interfacial abruptness, the roughness and waviness of the layers, and grain size being crucial. Such devices have applications in information storage systems, and are therefore of great technological interest as well as being of fundamental scientific interest. The layers must be studied at high spatial resolution if the microstructural parameters are to be characterized with sufficient detail to enable the effects of fabrication conditions on properties to be understood, and the techniques of high resolution electron microscopy, transmission electron microscopy chemical mapping, and atom probe microanalysis are ideally suited. This article describes the application of these techniques to a range of materials including spin valves, spin tunnel junctions, and GMR multilayers.
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