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Новости Nature

Nitrogen-doped mesoporous SiC materials with catalytically active cobalt nanoparticles for the efficient and selective hydrogenation of nitroarenes

Solid catalysts under the spotlight

A general soft-enveloping strategy in the templating synthesis of mesoporous metal nanostructures

Facile storage and release of white phosphorus and yellow arsenic

In situ quantitative single-molecule study of dynamic catalytic processes in nanoconfinement

Three-dimensional bicontinuous nanoporous materials by vapor phase dealloying

MXene molecular sieving membranes for highly efficient gas separation

Solid-state synthesis

Publisher Correction: Hierarchical self-entangled carbon nanotube tube networks

Three-Dimensional Bi-Continuous Nanoporous Gold/Nickel Foam Supported MnO2 for High Performance Supercapacitors

Ultrathin graphene oxide-based hollow fiber membranes with brush-like CO2-philic agent for highly efficient CO2 capture

Redox-switchable breathing behavior in tetrathiafulvalene-based metal–organic frameworks

Лента новостей (Journal of Porous Materials)

Effect of hydro-thermal carbonisation on the structural properties of bulk-type wood ( Chamaecyparis obtusa ) upon high-temperature heat treatment


Hydro-thermal carbonisation (HTC) is a method to convert biomorphic materials such as wood to carbon, with the advantage of enhancing their specific surface area to an extent greater than that by pyrolysis. In this study, wood samples underwent HTC at 250 °C, followed by a heat treatment at 600, 800 or 1000 °C. The cell walls of the HTC processed samples showed a structure made of alternating porous and dense carbon layers that changed as a function of the additional heat-treatment temperature. The specific surface area of the samples which underwent only a pyrolysis carbonisation drastically decreased at 80 °C, while that of the HTC samples was 473 m2/g, which enabled them to maintain a high-temperature stability. Compressive strength tests demonstrated plastic deformation and a different fracture mode for the HTC samples compared to the samples subjected to pyrolysis carbonisation only. Different values of mechanical strength in longitudinal and vertical directions were analysed.

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Microstructure, thermal and electrical properties of polyaniline/phenolic composite aerogel


Phenolic aerogel was first fabricated by sol–gel polymerization and freeze-drying method. Then, it was soaked into aniline solvent for 1 day. Ultimately, polyaniline/phenolic (PANI/RF) composite aerogel was obtained after the aniline molecules inside the phenolic aerogel were polymerized into polyaniline. The microstructure, thermal and electrical properties of the composites were investigated. The experimental results showed that polyaniline wires adhere to the surface of the micro holes skeleton which can be observed from the SEM images. Thus, polyaniline wires will form much smaller network inside the RF network, exhibiting an interpenetrating 3D network structure. In addition, compared with RF aerogel, PNAI/RF aerogel had maintained the thermal performance well, which showed mildly decline in heat-resistance and increase in heat conductivity, respectively. What’s more, it exhibited superior electrical performance (good specific capacitance) as compared with that of RF aerogel which is non-conducting, In general, PANI/RF aerogel with low heat conductivity (0.021 W/mK), high electrical conductivity (0.12 S/cm) and specific capacitance (280 F/g) exhibited more excellent comprehensive performance than single RF aerogel.

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Synthesis of free template ZSM-5 catalyst from rice husk ash and co-modified with lanthanum and phosphorous for catalytic cracking of naphtha


ZSM-5 catalysts were synthesized from rice husk ash without using template and their catalytic activity has been investigated in catalytic cracking of light naphtha. Effect of hydrothermal temperature (170, 180 and 190 °C) on physicochemical properties of catalysts was investigated by BET, FE-SEM, FTIR, XRD and TGA-DTG analyses. The XRD analysis showed that hydrothermal temperature had great influence on crystalline structure of ZSM-5. Sample which was synthesized at 180 °C showed high crystllinity without any undesired alumina-silicate phases. The FE-SEM analysis showed that synthesis of ZSM-5 at 180 °C led to showed micro-scale hexagonal-shaped morphology. Furthermore, the textural properties of synthesized samples depend on the synthesis temperature drastically. Results of catalytic activity test showed that the synthesis temperature has great influence on the activity of ZSM-5 and the sample which synthesized with at 180 °C showed the highest catalytic activity. Furthermore, in order to improve the catalyst performance and the stability, both of Lanthanum and Phosphorus were used in catalytic cracking of naphtha. 2.5La–3P/ZSM-5 produced the highest light olefins yield. Catalyst modification of ZSM-5 by La and P, increased the ratio of propylene/ethylene from 1 to 2.

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Research of silica aerogels prepared by acidic silica sol under the condition of atmospheric pressure drying


Acidic silica sol was used as precursor to prepare SiO2 aerogels using the atmospheric pressure drying technology. The influence of pH, water bath temperature and concentrations of silica sol on the structure parameters and morphology were systematically studied. SiO2 aerogel prepared with the sol concentration of 20% possessed uniform structure and the best structure parameters. Water bath temperature exhibited an obvious effect on morphology, specific surface area and porosity. Moreover, the optimal SiO2 aerogel showed a good heat resistance up to 700 °C. A lower thermal conductivity was 0.019 W/m · K at room temperature (25 °C) and 0.044 W/m · K at 600 °C.

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Flexible, ultrafine and abundant microporous carbon nanofibers prepared by electrospinning from resole-type liquefied biomass-based resin


In the present work, flexible porous carbon nanofibers (PCNFs) of 175 nm diameter were prepared by electrospinning process using resole-type liquefied biomass-based resin (RLBR) as precursor. The addition of defined amount of polyvinyl alcohol (PVA) is essential for the bead-free fibers forming. The final PCNFs were obtained after one-step carbonization of as-spun nanofibers, which presented abundant micropores (0.9 and 1.8 nm) and high specific surface area of 956 m2/g without any activation process. This indicates that the flexible RLBR-based PCNFs will be promising not only in adsorbent and catalyst support materials but also as materials in electrode capacitance application.

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In situ construction of porous NiCo 2 O 4 /Ni foam electrodes for high-performance energy storage applications


A novel three-dimensional (3D) porous flower-like NiCo2O4 electrode is reported. The electrode is constructed by homogeneous chemical co-precipitation involving the in situ growth of ternary nickel cobaltite nanosheets on a Ni foam, and a high temperature heat treatment. Field emission electron microscopy (FESEM) demonstrate that the porous flower-like structure is made up of uniform thin nanosheets with thickness of about 10 nm. Electrochemical studies reveal that the porous flower-like electrode exhibits excellent supercapacitor behavior with a high initial specific capacitance of 1046 F g−1 (at 1 A g−1) and stable cycling performance.

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Well-matched electrochemical performances of TiO 2 nanotubes based on Ti wires with strong adhesion to Ti substrate


Anodic TiO2 nanotubes (ATNTs) fabricated by anodization of Ti foils have been investigated for many years due to unique structure and excellent electrochemical performance. However, nanotube arrays fabricated on Ti foils are prone to peeling, which is one of the critical defects for applications. To overcome this challenge, the nanotubes on Ti wires are fabricated for the first time, for which the cylinder shape can neutralize stress between ATNTs and Ti substrate. The influences of anodizing temperature and NH4F concentration on morphology and electrochemical performances of ATNTs fabricated on Ti wires and Ti foils, are explored and compared in detail. There are many remarkable differences between anodization processes on Ti wires and Ti foils. The anodizing current density–time curves of ATNTs fabricated on Ti wires present a slow and stepwise decrease at the quasi-steady state and corresponding FESEM images show that ATNTs with numerous halfway-terminated nanotubes were growing in a radial direction on the circumference of Ti wires, much different from ATNTs fabricated on Ti foils. The electrochemistry behaviors (supercapacitor performance) of ATNTs fabricated on Ti wires and Ti foils were studied by cyclic voltammetry and galvanostatic charge–discharge tests. The results demonstrate that the nanotubes fabricated on Ti wires show stronger adhesion strength and stable performance, thus paving the way for the application of ATNTs.

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Synthesis of composite insulation materials—expanded perlite filled with silica aerogel


The aim of this paper is to synthesis a new type of insulation material (EPA), which fill the aerogels into the expanded perlite (EP). EP is a kind of lightweight filler, its application is constrained by the character of absorbing water easily. The silicic acid is inhaled into the expanded perlite at −0.1 MPa, aging 24 h, it becomes aerogel after solvent exchanging/surface modifying and drying. The pores of EP are filled with aerogel which affects thermal conductivity of expanded perlite little and makes it hydrophobic. EPA has a wider use than EP for its hydrophobic character. A new recipe to synthesize aerogel, filled into EP, with the thermal conductivity of 0.034 W/m K in ambient pressure drying is found in this experiment. The time and reagents dosage for synthesizing EPA are less than large block of aerogel, while the thermal conductivity is close to it. The scanning electron microscopy is used to analyze EPA’s micro structure. The thermal conductivity tester is used for testing the thermal conductivity of silica aerogel, expanded perlite and EPA.

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