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https://www.readbyqxmd.com/read/28817290/air-stable-porous-fe2n-encapsulated-in-carbon-microboxes-with-high-volumetric-lithium-storage-capacity-and-long-cycle-life
#1
Yifan Dong, Bingliang Wang, Kangning Zhao, Yanhao Yu, Xudong Wang, Liqiang Mai, Song Jin
The development of inexpensive electrode materials with high volumetric capacity and long cycle-life is a central issue for large-scale lithium-ion batteries. Here, we report a nanostructured porous Fe2N anode fully encapsulated in carbon microboxes (Fe2N@C) prepared through a facile confined anion conversion method. The resulting carbon microboxes could not only protect the air-sensitive Fe2N from oxidation, but also retain thin and stable SEI layer. The appropriate internal voids in the Fe2N cubes help to release the volume expansion during lithiation/delithiation processes and Fe2N is kept inside the carbon microboxes without breaking the shell, resulting in a very low electrode volume expansion (the electrode thickness variation upon lithiation is ~9%)...
August 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28817257/cation-anion-arrangement-patterns-in-self-assembled-pd2l4-and-pd4l8-coordination-cages
#2
Guido H Clever, Philip Punt
Compounds featuring one-dimensional regular arrangements of stacked metal complexes and alternating [cation-anion]∞ sequences have raised considerable interest owing to their peculiar electronic and optical properties as well as guest inclusion capabilities. While traditional ways to realize these structural motifs rely on crystalline compounds, exclusively existing in the solid state, recent progress in the area of metal-mediated supramolecular self-assembly allows for the rational synthesis of structurally well-defined short stretches of stacked metal complexes and cation-anion arrangements...
August 17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28817106/ag-coated-heterostructures-of-zno-tio%C3%A2-delaminated-montmorillonite-as-solar-photocatalysts
#3
Carolina Belver, Mariana Hinojosa, Jorge Bedia, Montserrat Tobajas, Maria Ariadna Alvarez, Vicente Rodríguez-González, Juan Jose Rodriguez
Heterostructures based on ZnO-TiO₂/delaminated montmorillonite coated with Ag have been prepared by sol-gel and photoreduction procedures, varying the Ag and ZnO contents. They have been thoroughly characterized by XRD, WDXRF, UV-Vis, and XPS spectroscopies, and N₂ adsorption, SEM, and TEM. In all cases, the montmorillonite was effectively delaminated with the formation of TiO₂ anatase particles anchored on the clay layer's surface, yielding porous materials with high surface areas. The structural and textural properties of the heterostructures synthesized were unaffected by the ZnO incorporated...
August 17, 2017: Materials
https://www.readbyqxmd.com/read/28817096/time-resolved-study-of-nanomorphology-and-nanomechanic-change-of-early-stage-mineralized-electrospun-poly-lactic-acid-fiber-by-scanning-electron-microscopy-raman-spectroscopy-and-atomic-force-microscopy
#4
Mengmeng Wang, Yin Cai, Bo Zhao, Peizhi Zhu
In this study, scanning electron microscopy (SEM), Raman spectroscopy and high-resolution atomic force microscopy (AFM) were used to reveal the early-stage change of nanomorphology and nanomechanical properties of poly(lactic acid) (PLA) fibers in a time-resolved manner during the mineralization process. Electrospun PLA nanofibers were soaked in simulated body fluid (SBF) for different periods of time (0, 1, 3, 5, 7 and 21 days) at 10 °C, much lower than the conventional 37 °C, to simulate the slow biomineralization process...
August 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28816318/a-soluble-star-shaped-silsesquioxane-cored-polymer-towards-novel-stabilization-of-ph-dependent-high-internal-phase-emulsions
#5
Yuxiu Xing, Jun Peng, Kai Xu, Shuxi Gao, Xuefeng Gui, Shengyuan Liang, Longfeng Sun, Mingcai Chen
A well-defined pH-responsive star-shaped polymer containing poly(N,N-dimethylaminoethyl methacrylate) (PDMA) arms and a cage-like methacryloxypropyl silsesquioxane (CMSQ-T10) core was used as an interfacial stabilizer for emulsions consisting of m-xylene and water. We explored the properties of the CMSQ/PDMA star-shaped polymer using the characteristic results of nuclear magnetic resonance (NMR) spectroscopy, size exclusion chromatography (SEC), dynamic light scattering (DLS), and zeta potential and conductivity measurements...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28816303/reversible-surface-functionalisation-of-emulsion-templated-porous-polymers-using-dithiophenol-maleimide-functional-macromolecules
#6
A M Eissa, P Wilson, C Chen, J Collins, M Walker, D M Haddleton, N R Cameron
A new facile and efficient route for the chemical functionalisation of thiol-acrylate polyHIPE materials with responsive macromolecules using the highly emissive dithiomaleimide (DTM) linker is demonstrated. Functionalisation is found to be reversible upon addition of a thiol-containing compound, glutathione, resulting in switchable surface properties including fluorescence and wettability, hence broadening the scope of applications.
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816302/functional-nanonetwork-structured-polymers-and-carbons-with-silver-nanoparticle-yolks-for-antibacterial-application
#7
Yanhuan Lin, Kairong Xiong, Zhitao Lu, Shaohong Liu, Zhaojie Zhang, Yuheng Lu, Ruowen Fu, Dingcai Wu
Functional nanonetwork-structured polymers and carbons with silver nanoparticle yolks (∼20 nm) were successfully fabricated via hypercrosslinking chemistry. Benefiting from the hierarchical porous nanonetwork structure and high surface areas (up to 566 m(2) g(-1)), the as-prepared nanocomposites demonstrated superior long-term antibacterial performances (e.g., 6 days).
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28816017/iron-cobalt-phosphomolybdate-with-high-electrocatalystic-activity-for-oxygen-evolution-reaction
#8
Haoying Zhai, Taotao Gao, Ting Qi, Yajie Zhang, Guangfeng Zeng, Dan Xiao
Iron-cobalt phosphomolybdate (FeCoPM12) nanoparticles,a high-efficient catalytic material for oxygen evolution reaction (OER), were fabricated via a coprecipitation route. Compared with iron-cobalt hydroxide and state-of-art RuO2 electrocatalysts, the as-prepared FeCoPM12 sample exhibited robust OER catalytic activity with a low overpotential of 258 mV at a current density of 10 mA cm-2 and a small Tafel slope of 33 mV dec-1. Moreover, the as-synthesized sample presented preferable stability, and after 10 h at 1...
August 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815957/tailoring-hierarchical-zeolites-with-designed-cationic-surfactants-and-its-high-catalytic-performance
#9
Kai Zhang, Chao Li, Zewei Liu, Min Wang, Xin Yan, Hongxia Xi
Three hierarchical porous zeolites (H-*BEA, H-MTW and H-*MRE) were successfully synthesized with the assistant of designed cationic surfactants under hydrothermal synthesis conditions. The as-synthesized zeolite samples can be easily regulated by changing the number of long hydrophobic n-alkyl chains. Also, we investigated the relationship between the length of the surfactant and the formation of microporous structure of zeolite. Furthermore, alkylation of benzene with propene was performed as probe reaction to evaluate the catalytic performance of the synthesized hierarchical zeolites...
August 17, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28815884/periodontal-ligament-like-tissue-regeneration-with-drilled-porous-decalcified-dentin%C3%A2-matrix-sheet-composite
#10
Ge Feng, Yan Wu, Yu Yong, Lan Huang, Shu An, Bo Hu, Jun Luo, Jinlin Song
OBJECTIVE: In this study, we constructed a composite by combining the human dental follicle cell sheet and a manual drilled porous decalcified dentin matrix that was used to construct ectopic tissue-engineered periodontal ligament-like tissues in renal capsules of nude mice. MATERIALS AND METHODS: Human dental follicle cells were harvested from human lower third molars and then embedded into a temperature-sensitive culture dish. These cells were then placed into frozen porous decalcified dentin matrix sheets and induced by 50 g/ml ascorbic acid...
August 16, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28815664/simultaneous-lateral-bone-augmentation-and-implant-placement-using-a-particulated-synthetic-bone-substitute-around-chronic-peri-implant-dehiscence-defects-in-dogs
#11
Ui-Won Jung, Jae-Kook Cha, Fabio Vignoletti, Javier Nuñez, Javier Sanz, Mariano Sanz
AIM: To determine the histological outcomes when using a highly porous synthetic bone substitute and a cross-linked collagen membrane for lateral bone augmentation of peri-implant dehiscence defects. METHODS: In 8 dogs, three treatment groups were randomly allocated at each peri-implant dehiscence defect (mean height x depth = 3 x 1 mm): (i) synthetic bone substitute covered by a cross-linked collagen membrane (test group), (ii) deproteinized bovine bone mineral covered by a natural collagen membrane (positive control), and (iii) no treatment (negative control)...
August 16, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28815234/synthesis-of-mesoporous-iridium-nanosponge-a-highly-active-thermally-stable-and-efficient-olefin-hydrogenation-catalyst
#12
Sourav Ghosh, Balaji R Jagirdar
Three dimensional porous structures offer high specific surface areas and large pore volumes, which enhance substrate diffusion within the porous structures and provide a large number of surface active sites. Such types of structures find applications in catalysis. Herein, we report a simple synthetic strategy for the preparation of iridium nanosponges by the capping agent dissolution method. An Ir@BNHx nanocomposite was prepared starting from different iridium precursors by a solid state reduction method using ammonia borane wherein iridium(0) nanoparticles are embedded in a BNHx polymer...
August 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28814954/intrinsic-osteoinductivity-of-porous-titanium-scaffold-for-bone-tissue-engineering
#13
Maryam Tamaddon, Sorousheh Samizadeh, Ling Wang, Gordon Blunn, Chaozong Liu
Large bone defects and nonunions are serious complications that are caused by extensive trauma or tumour. As traditional therapies fail to repair these critical-sized defects, tissue engineering scaffolds can be used to regenerate the damaged tissue. Highly porous titanium scaffolds, produced by selective laser sintering with mechanical properties in range of trabecular bone (compressive strength 35 MPa and modulus 73 MPa), can be used in these orthopaedic applications, if a stable mechanical fixation is provided...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/28814861/the-influence-of-direct-laser-metal-sintering-implants-on-the-early-stages-of-osseointegration-in-diabetic-mini-pigs
#14
Naiwen Tan, Xiangwei Liu, Yanhui Cai, Sijia Zhang, Bo Jian, Yuchao Zhou, Xiaoru Xu, Shuai Ren, Hongbo Wei, Yingliang Song
BACKGROUND: High failure rates of oral implants have been reported in diabetic patients due to the disruption of osseointegration. The aim of this study was to investigate whether direct laser metal sintering (DLMS) could improve osseointegration in diabetic animal models. METHODS: Surface characterizations were carried out on two types of implants. Cell morphology and the osteogenic-related gene expression of MG63 cells were observed under conditions of DLMS and microarc oxidation (MAO)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28813140/robust-pitaya-structured-pyrite-as-high-energy-density-cathode-for-high-rate-lithium-batteries
#15
Xijun Xu, Jun Liu, Zhengbo Liu, Jiadong Shen, Renzong Hu, Jiangwen Liu, Liuzhang Ouyang, Lei Zhang, Min Zhu
To solve the serious problems (the agglomeration of nano-Fe0, dissolution of polysulfide and low electronic conductivity of Li2S) of earth-abundant pyrite (FeS2) cathode for lithium batteries, a simple in-situ encapsulation and transformation route has been successfully developed to synthesis pitaya-structured porous carbon embedded with FeS2 nanoparticles. Due to such hierarchical architecture design, this cathode of pitaya-structured FeS2@C can effectively avoid the serious agglomeration and coarsening of small Fe nanoparticles, reduce the dissolution of polysulfide and provide superior kinetics toward lithium storage, resulting in enhanced reversibility and rate capability...
August 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28813026/breath-figure-self-assembly-a-versatile-method-of-manufacturing-membranes-and-porous-structures-physical-chemical-and-technological-aspects
#16
REVIEW
Edward Bormashenko
The review is devoted to the physical, chemical, and technological aspects of the breath-figure self-assembly process. The main stages of the process and impact of the polymer architecture and physical parameters of breath-figure self-assembly on the eventual pattern are covered. The review is focused on the hierarchy of spatial and temporal scales inherent to breath-figure self-assembly. Multi-scale patterns arising from the process are addressed. The characteristic spatial lateral scales of patterns vary from nanometers to dozens of micrometers...
August 16, 2017: Membranes
https://www.readbyqxmd.com/read/28812876/cocatalysing-pt-pto-phase-junction-nanodots-on-hierarchically-porous-tio2-for-highly-enhanced-photocatalytic-hydrogen-production
#17
Xiaoning Ren, Zhiyi Hu, Jun Jin, Liang Wu, Chao Wang, Jing Liu, Fu Liu, Min Wu, Yu Li, Gustaaf Van Tendeloo, Bao-Lian Su
Phase-junction between cocatalyst and semiconductor host is quite effective to enhance the photocatalytic activity, and is widely studied while the report on the phase-juncted cocatalyst is still rare. In this work, we report the deposition of the Pt/PtO phase-juncted nanodots as cocatalyst via NaOH modification of an interconnected meso-macroporous TiO2 network with high surface area and inner-particle mesopores to enhance the performance of photocatalytic H2 production. Our results show that NaOH modification can largely influence the Pt/PtO phase-juncted nanodots formation and dispersity...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812872/effect-of-mineral-dissolution-precipitation-and-co2-exsolution-on-co2-transport-in-geological-carbon-storage
#18
Ruina Xu, Rong Li, Jin Ma, Di He, Peixue Jiang
Geological carbon sequestration (GCS) in deep saline aquifers is an effective means for storing carbon dioxide to address global climate change. As the time after injection increases, the safety of storage increases as the CO2 transforms from a separate phase to CO2(aq) and HCO3(-) by dissolution and then to carbonates by mineral dissolution. However, subsequent depressurization could lead to dissolved CO2(aq) escaping from the formation water and creating a new separate phase which may reduce the GCS system safety...
August 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28812871/high-performance-porous-molybdenum-oxynitride-based-fiber-supercapacitors
#19
Dan Ruan, Rui Lin, Kui Jiang, Xiang Yu, Yaofeng Zhu, Yaqin Fu, Zilong Wang, He Yan, Wenjie Mai
Scalable manufacturing of flexible, fiber-shaped energy storage devices has enabled great technological advances in wearable and portable technology. Replacing inefficient oxides with inexpensive and high-performance oxynitrides with more favourable 3D structures is critical if the practical applications of these technologies are to be realised. Here we developed a facile and controllable approach for the synthesis of 3D porous micropillars of molybdenum oxynitride, which exhibit high conductivity, robust stability and excellent energy storage properties...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812868/light-and-strong-hierarchical-porous-sic-foam-for-efficient-electromagnetic-interference-shielding-and-thermal-insulation-at-elevated-temperatures
#20
Caiyun Liang, Zhenfeng Wang, Lina Wu, Xiaochen Zhang, Huan Wang, Zhijiang Wang
A novel light but strong SiC foam with hierarchical porous architecture are fabricated by using dough as raw material via carbonization and followed carbothermal reduction with silicon source. A significant synergistic effect is achieved by embedding meso and nano pores in micro-sized porous skeleton, which endows the SiC foam with high-performance electromagnetic interference shielding (EMI), thermal insulation and mechanical properties. The micro-sized skeleton withstands the high stress. The meso- and nano-sized pores enhance the multiple reflection of the incident electromagnetic waves and elongate the path of heat transfer...
August 16, 2017: ACS Applied Materials & Interfaces
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