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https://www.readbyqxmd.com/read/29776005/flexible-and-hierarchical-metal-organic-framework-composites-for-high-performance-catalysis
#1
Ning Huang, Hannah Drake, Jialuo Li, Jiangdong Pang, Ying Wang, Shuai Yuan, Qi Wang, Peiyu Cai, Junsheng Qin, Hong-Cai Zhou
The development of new types of porous composite materials is of great significance owing to their potentially improved performance over those of individual components and extensive applications in separation, energy storage, and heterogeneous catalysis. In this work, we integrated mesoporous metal-organic frameworks (MOFs) with macroporous melamine foam (MF) using a one-pot process, generating a series of MOF/MF composite materials with preserved crystallinity, hierarchical porosity, and increased stability over that of melamine foam...
May 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29775882/rapid-highly-efficient-and-stable-catalytic-hydrodechlorination-of-chlorophenols-over-novel-pd-cnts-ni-foam-composite-catalyst-in-continuous-flow
#2
Jun Xiong, Ying Ma, Wei Yang, Linshan Zhong
A novel Pd/CNTs-Ni foam composite catalyst was developed for catalytic hydrodechlorination of chlorophenols by using CNTs-Ni foam as support. Characterizations including FESEM, TEM/HRTEM, HAADF-STEM and element mapping revel that the composite catalyst with 2 wt.% Pd loading possesses high porous micro-network structure and high dispersed active Pd nanoparticles (5.81 nm) on CNTs surface. The HDC of chlorophenols over Pd/CNTs-Ni foam composite catalyst has been studied in continuous-flow packed bed reactor...
May 15, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775818/carbon-aerogel-based-supercapacitors-modified-by-hummers-oxidation-method
#3
Yuelong Xu, Bin Ren, Shasha Wang, Lihui Zhang, Zhenfa Liu
Carbon aerogels of an inter-connected three-dimensional (3D) structure are a potential carbon material for supercapacitors. We report a new oxidation modification method to prepare a series of modified carbon aerogels (OM-CA) by Hummers oxidation method. Oxidation-modified carbon aerogels (OM-CA) are obtained from carbon aerogel powders oxidized by Hummers method. Sulfuric acid stoichiometry is studied in order to investigate the effect of the surface oxygen group on surface area and electrochemical performance...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29775731/targeted-and-controlled-drug-delivery-by-multifunctional-mesoporous-silica-nanoparticles-with-internal-fluorescent-conjugates-and-external-polydopamine-and-graphene-oxide-layers
#4
Anh-Vy Tran, KyuHwan Shim, Thu-Thao Vo Thi, Jeong-Keun Kook, Seong Soo A An, Sang-Wha Lee
This study demonstrated the targeted delivery and controlled release of cisplatin drug molecules from doubly decorated mesoporous silica nanoparticles (MSNs), which were internally grafted with fluorescent conjugates and externally coated with polydopamine (PDA) and graphene oxide (GO) layers. The brush-like internal conjugates conferred fluorescent functionality and high capacity of cisplatin loading into MSNs, as well as contributing to a sustained release of the cisplatin through a porous channel with the assistance of external PDA layer...
May 15, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29775436/modelling-the-degree-of-porosity-of-the-ceramic-surface-intended-for-implants
#5
Sebastian Stach, Olga Kędzia, Żaneta Garczyk, Zygmunt Wróbel
The main goal of the study was to develop a model of the degree of surface porosity of a biomaterial intended for implants. The model was implemented using MATLAB. A computer simulation was carried out based on the developed model, which resulted in a two-dimensional image of the modelled surface. Then, an algorithm for computerised image analysis of the surface of the actual oxide bioceramic layer was developed, which enabled determining its degree of porosity. In order to obtain the confocal micrographs of a few areas of the biomaterial, measurements were performed using the LEXT OLS4000 confocal laser microscope...
May 18, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29775316/l-arginine-catalyzed-synthesis-of-nanometric-organosilica-particles-through-a-waterborne-sol-gel-process-and-their-porous-structure-analysis
#6
Xiaoguang Qiao, Pierre-Yves Dugas, Laurent Veyre, Elodie Bourgeat-Lami
We report an efficient and easy to implement waterborne sol-gel process for the synthesis of nanometric organosilica particles. In this process, tetraethyl orthosilicate (TEOS) and 3-(methacryloxy)propyl trimethoxy silane (γ-MPS), employed as silica sources, are heterogeneously delivered in an aqueous solution of L-arginine, a basic amino acid used as catalyst, from a top organic layer. Co-condensation of TEOS with γ-MPS led to organosilica particles with diameters comprised between 30 and 230 nm when increasing the γ-MPS content from 0 to 10...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29775272/remarkable-enhancement-in-the-photoelectric-performance-of-uniform-flower-like-mesoporous-fe3o4-wrapped-in-nitrogen-doped-graphene-networks
#7
Jixin Yao, Kang Zhang, Wen Wang, Xueqin Zuo, Qun Yang, Huaibao Tang, Mingzai Wu, Guang Li
The porous structure and excellent specific surface area are superior for use as a counter electrode (CE) material. In addition, N-doped graphene possesses a remarkable electron-transfer pathway and many active sites. Therefore, a novel idea is to wrap uniform flower-like mesoporous Fe3O4 (Fe3O4UFM) in a N-doped graphene (N-RGO) network structure to enhance the power conversion efficiency (PCE). The hybrid materials of Fe3O4UFM@N-RGO are first used as a CE in dye-sensitized solar cells (DSSCs), showing a preeminent conductive interconnected 3D porous structure with more catalytic activity sites and a better ability for and a faster reaction rate of charge transfer, resulting in quicker reduction of I_3^- than Pt...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29775181/porous-lithium-doped-hydroxyapatite-scaffold-seeded-with-hypoxia-preconditioned-bone-marrow-mesenchymal-stem-cells-for-bone-tissue-regeneration
#8
Donghai Li, Huifang Liu, Jinhai Zhao, Zhouyuan Yang, Xiaowei Xie, Zhun Wei, Dongzhe Li, Pengde Kang
Hydroxyapatite (HA) is a commonly used biomaterial in bone-tissue engineering, but pure HA is deficient in osteoinduction. In this study, we fabricated scaffolds of lithium-doped HA (Li-HA) and assess the bone generation enhancement of Li-HA scaffolds seeded with hypoxia-preconditioned bone-marrow mesenchymal stem cells (BMMSCs). We found that 1.5%Li-HA obtained optimal cell proliferation activity in vitro. In an in vivo study, Li-HA/BMSCs enhanced new bone formation, reducing the GSK-3β and increasing the β-catenin, but the angiogenic effect was not modified significantly...
May 18, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29775049/bandgap-tunable-porous-borocarbonitrides-nanosheets-for-high-energy-density-supercapacitors
#9
Shouzhi Wang, Fukun Ma, Hehe Jiang, Yongliang Shao, Yongzhong Wu, Xiaopeng Hao
Bandgap tunable porous borocarbonitride (BCN) nanosheets were successfully fabricated with cheap and readily available precursors by annealing and exfoliating. The bandgap of the as-prepared BCN materials ranges from 5.5 eV to 1.0 eV, these samples exhibit beneficial structural features suitable for the application in supercapacitors (SCs). Especially, the BCN material with a bandgap of 1.0 eV exhibits great specific surface area (600.9 m2 g‒1), massive active sites and excellent conductivity (10.8 S m‒1)...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29774952/plant-roots-redesign-the-rhizosphere-to-alter-the-three-dimensional-physical-architecture-and-water-dynamics
#10
Sheikh M F Rabbi, Matthew K Tighe, Richard J Flavel, Brent N Kaiser, Chris N Guppy, Xiaoxian Zhang, Iain M Young
The mechanisms controlling the genesis of rhizosheaths are not well understood, despite their importance in controlling the flux of nutrients and water from soil to root. Here, we examine the development of rhizosheaths from drought-tolerant and drought-sensitive chickpea varieties; focusing on the three-dimensional characterization of the pore volume (> 16 μm voxel spatial resolution) obtained from X-ray microtomography, along with the characterization of mucilage and root hairs, and water sorption. We observe that drought-tolerant plants generate a larger diameter root, and a greater and more porous mass of rhizosheath, which also has a significantly increased water sorptivity, as compared with bulk soil...
May 18, 2018: New Phytologist
https://www.readbyqxmd.com/read/29774742/dual-role-of-water-in-heterogeneous-catalytic-hydrolysis-of-sarin-by-zirconium-based-metal-organic-frameworks
#11
Mohammad R Momeni, Christopher J Cramer
Recent experimental studies on ZrIV-based metal-organic frameworks (MOFs) have shown the extraordinary effective-ness of these porous materials for the detoxification of phos-phorus-based chemical warfare agents (CWAs). However, pressing challenges remain with respect to characterizing these catalytic processes both at the molecular and crystalline lev-els. We here use theory to compare the reactivity of different zirconium-based MOFs for the catalytic hydrolysis of the CWA sarin, using both periodic and cluster modeling...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29774662/highly-nitrogen-doped-porous-carbon-derived-from-zeolitic-imidazolate-framework-8-for-co2-capture
#12
Xiancheng Ma, Liqing Li, Ruofei Chen, Chunhao Wang, Haoyang Li, Hailong Li
CO2 adsorption capacity of nitrogen-doped porous carbon depends to a large nitrogen doping levels and high surface area in previous studies. However, it seems difficult to incorporate large amounts of nitrogen while maintaining a high surface area and pore structure. Here we have reported porous carbon having a nitrogen content of up to 25.52% and specific surface area of 948 m2 g-1, which is prepared by pyrolyzing the nitrogen-containing zeolite imidazole framework-8 and urea composite at 650 °C under a nitrogen atmosphere...
May 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29774646/chiral-isocamphoric-acid-founding-a-large-family-of-homochiral-porous-materials
#13
Xiang Zhao, Edward T Nguyen, Anh N Hong, Pingyun Feng, Xianhui Bu
Homochiral metal-organic frameworks (MOFs) are an important class of chiral solids with potential applications in chiral recognition; however, relatively few are available. Of great importance is the availability of low-cost, racemization-resistant, and versatile enantiopure building blocks. Among chiral building blocks, d-camphoric acid is highly prolific, yet, its trans-isomer, l-isocamphoric acid, has remained unknown in the entire field of solid-state materials. Its rich yet totally untapped synthetic and structural chemistry has now been investigated through the synthesis of a large family of homochiral metal isocamphorates...
May 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29774644/storage-of-co%C3%A2-into-porous-coordination-polymer-controlled-by-molecular-rotor-dynamics
#14
Munehiro Inukai, Masanori Tamura, Satoshi Horike, Masakazu Higuchi, Susumu Kitagawa, Koichi Nakamura
Design to store gas molecules, such as CO₂, H₂, and CH₄, under low pressure is one of the most important challenges in chemistry and materials science. Herein, we describe the storage of CO₂ in the cavities of a porous coordination polymer (PCP) using molecular rotor dynamics. Owing to the narrow pore windows of PCP, CO₂ was not adsorbed at 195 K. As the temperature increased, the rotors exhibited rotational modes; such rotations dynamically expanded the size of the windows, leading to CO₂ adsorption...
May 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29774611/nanoporous-metallic-networks-fabrication-optical-properties-and-applications
#15
REVIEW
Racheli Ron, Emir Haleva, Adi Salomon
Nanoporous metallic networks are a group of porous materials made of solid metals with suboptical wavelength sizes of both particles and voids. They are characterized by unique optical properties, as well as high surface area and permeability of guest materials. As such, they attract a great focus as novel materials for photonics, catalysis, sensing, and renewable energy. Their properties together with the ability for scaling-up evoke an increased interest also in the industrial field. Here, fabrication techniques of large-scale metallic networks are discussed, and their interesting optical properties as well as their applications are considered...
May 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29774341/porous-nico-2-o-4-nanoarray-integrated-binder-free-3d-open-electrode-offers-a-highly-efficient-sensing-platform-for-enzyme-free-glucose-detection
#16
X Luo, M Huang, D He, M Wang, Y Zhang, P Jiang
High electrical conductivity and the exposure to more active sites are crucial to boost the performance of a glucose sensor. A porous binary metal oxide nanoarray integrated on a binder-free 3D electrode is expected to offer a highly sensitive sensing platform. As a model, porous NiCo2O4 nanowire arrays supported on carbon cloth (NiCo2O4 NWA/CC) have been prepared and used for enzyme-free glucose sensing. NiCo2O4 NWA/CC shows larger effective surface area, superior electronic conductivity, and higher catalytic activity towards enzyme-free glucose sensing, with a linear range from 1 μM to 0...
May 18, 2018: Analyst
https://www.readbyqxmd.com/read/29773788/immunogene-therapy-with-fusogenic-nanoparticles-modulates-macrophage-response-to-staphylococcus-aureus
#17
Byungji Kim, Hong-Bo Pang, Jinyoung Kang, Ji-Ho Park, Erkki Ruoslahti, Michael J Sailor
The incidence of adverse effects and pathogen resistance encountered with small molecule antibiotics is increasing. As such, there is mounting focus on immunogene therapy to augment the immune system's response to infection and accelerate healing. A major obstacle to in vivo gene delivery is that the primary uptake pathway, cellular endocytosis, results in extracellular excretion and lysosomal degradation of genetic material. Here we show a nanosystem that bypasses endocytosis and achieves potent gene knockdown efficacy...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773361/degradation-properties-of-chitosan-microspheres-poly-l-lactic-acid-composite-in-vitro-and-in-vivo
#18
Zhenzhao Guo, Dongying Bo, Yuan He, Xueshi Luo, Hong Li
Poly(L-lactic acid) (PLLA) is a popular biodegradable polymer, but the accumulated acid production by degradation is a bottleneck for its extended utilization. In this study, chitosan microspheres (CSMs) were introduced into PLLA porous matrices to manipulate the acid microclimate from PLLA degradation. In vitro and in vivo degradation were, respectively, performed in PBS and implanted into rat's subcutaneous. The results indicated that pH of CSMs/PLLA composites remained stable of around 7.50 in vitro until six weeks...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29772899/honeycomb-like-plga-b-peg-structure-creation-with-t-junction-micro-droplets
#19
Merve Gultekinoglu, Xinyue Jiang, Cem Bayram, Kezban Ulubayram, Mohan Edirisinghe
Amphiphilic block copolymers are widely used in science owing to their versatile properties. In this study, amphiphilic block copolymer poly(lactic-co-glycolic acid)-block-poly(ethylene glycol) (PLGA-b-PEG) was used to create micro droplets in a T-junction microfluidic device with a well-defined geometry. In order to compare interfacial characteristics of micro droplets, dichloromethane (DCM) and chloroform were used to prepare PLGA-b-PEG solution as an oil phase. In the T-junction device water and oil phases were manipulated at variable flow rates from 50 µL/min to 300 µL/min by increments of 50 µL/min...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29772646/an-innovative-porous-nanocomposite-material-for-the-removal-of-phenolic-compounds-from-aqueous-solutions
#20
Antonio Turco, Anna Grazia Monteduro, Elisabetta Mazzotta, Giuseppe Maruccio, Cosimino Malitesta
Energy efficient, low-cost, user-friendly, and green methods for the removal of toxic phenolic compounds from aqueous solution are necessary for waste treatment in industrial applications. Herein we present an interesting approach for the utilization of oxidized carbon nanotubes (CNTs) in the removal of phenolic compounds from aqueous solution. Dried pristine CNTs were stably incorporated in a solid porous support of polydimethylsiloxane (PDMS) facilitating the handling during both oxidation process of the nanomaterial and uptake of phenolic compounds, and enabling their safe disposal, avoiding expensive post-treatment processes...
May 16, 2018: Nanomaterials
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