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https://www.readbyqxmd.com/read/28449547/cobalt-oxide-porous-nanofibers-directly-grown-on-conductive-substrate-as-a-binder-additive-free-lithium-ion-battery-anode-with-high-capacity
#1
Hao Liu, Zheng Zheng, Bochao Chen, Libing Liao, Xina Wang
In order to reduce the amount of inactive materials, such as binders and carbon additives in battery electrode, porous cobalt monoxide nanofibers were directly grown on conductive substrate as a binder/additive-free lithium-ion battery anode. This electrode exhibited very high specific discharging/charging capacities at various rates and good cycling stability. It was promising as high capacity anode materials for lithium-ion battery.
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449545/structural-variety-and-adsorptive-properties-of-mesoporous-silicas-with-immobilized-oligosaccharide-groups
#2
Iryna Trofymchuk, Nadiia Roik, Lyudmila Belyakova
In this research, we report on the synthesis of mesoporous silicas with various quantities of immobilized oligosaccharide groups and different pore ordering degree. The hydrothermal co-condensation of tetraethyl orthosilicate and β-cyclodextrin-containing organosilane in the presence of cetyltrimethylammonium bromide template was employed. The purpose of this investigation was to show the opportunity of increasing β-cyclodextrin content in silica matrix by changing the molar ratio of initial reagents during organosilane synthesis and to determine whether the enhancing of immobilized groups on the surface influences on model aromatic compound adsorption from water...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449264/macroscopically-oriented-porous-materials-with-periodic-ordered-structures-from-zeolites-and-metal-organic-frameworks-to-liquid-crystal-templated-mesoporous-materials
#3
REVIEW
Joonil Cho, Yasuhiro Ishida
Porous materials with molecular-sized periodic structures, as exemplified by zeolites, metal-organic frameworks, or mesoporous silica, have attracted increasing attention due to their range of applications in storage, sensing, separation, and transformation of small molecules. Although the components of such porous materials have a tendency to pack in unidirectionally oriented periodic structures, such ideal types of packing cannot continue indefinitely, generally ceasing when they reach a micrometer scale...
April 27, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28449254/bioresorbable-fe-mn-and-fe-mn-ha-materials-for-orthopedic-implantation-enhancing-degradation-through-porosity-control
#4
Michael Heiden, Eric Nauman, Lia Stanciu
Resorbable, porous iron-manganese-hydroxyapatite biocomposites with suitable degradation rates for orthopedic applications are prepared using salt-leaching for the first time. These transient biomaterials have the potential to replace inert, permanent implants that can suffer from long-term complications, or have to be surgically removed, leaving an unfavorable void. Fe30Mn-10HA materials are newly developed to address inadequate resorption rates of degradable materials proposed for orthopedic environments in the past...
April 27, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28448880/rapid-green-synthesis-of-gold-nanocatalyst-for-high-efficiency-degradation-of-quinclorac
#5
Guorong Shi, Yulu Li, Gaihong Xi, Qinqin Xu, Zijun He, Yating Liu, Jianhui Zhang, Jun Cai
Porous chemical pretreated Saccharomyces cerevisiae was used as support, stabilizer, and reducing agent for the rapid green synthesis of gold nanocatalyst. Au nanoparticles (Au NPs) were generated through in-situ reduction of the absorbed Au(III) by the reductive functional groups of mannoproteins in yeast cell wall. The obtained spherical mono-dispersed Au NPs have an average particle diameter of 9.99±1.63nm as evidenced by TEM image, and exhibits excellent catalytic activity for the dechlorination of quinclorac to 8-quinoline-carboxylic acid by sodium borohydride...
April 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448879/adsorption-of-organic-arsenic-acids-from-water-over-functionalized-metal-organic-frameworks
#6
Mithun Sarker, Ji Yoon Song, Sung Hwa Jhung
Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)3) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption...
April 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28448835/continuous-production-of-polymer-nanoparticles-using-a-membrane-based-flow-cell
#7
Zhengnan Yang, Dona Foster, Ali Dhinojwala
We demonstrate the surfactant-free production of polymer nanoparticles using a continuous membrane-based tangential flow cell. Co-current streams of water and polymethylmethacrylate (PMMA)/acetone/water solution were separated by a porous regenerated cellulose (RC) membrane. The water concentration in the PMMA solution was adjusted so that as additional water diffused through the RC membrane, the PMMA solution composition crossed the two phase boundary to precipitate PMMA nanoparticles. The size of these nanoparticles varied with the concentration of the PMMA feed and the amount of water diffusing across the membrane...
April 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448142/bottleneck-effect-of-n-n-dimethylformamide-in-inof-1-increasing-co2-capture-in-porous-coordination-polymers
#8
Elí Sánchez-González, Eduardo González-Zamora, Diego Martínez-Otero, Vojtech Jancik, Ilich A Ibarra
The bottleneck effect of confined N,N-dimethylformamide (DMF) molecules was observed in InOF-1 for the first time: CO2 capture was remarkably enhanced in samples of as-synthesized InOF-1, thermally activated in such a way that a small residual amount of DMF molecules remained confined within the pores (DMF@InOF-1). Dynamic CO2 adsorption experiments on DMF@InOF-1 exhibited a CO2 capture of 8.06 wt % [1.5-fold higher than that of a fully activated InOF-1 (5.24%)]. DMF@InOF-1 can reversibly adsorb/desorb 8.09% CO2 with no loss of CO2 capacity after 10 cycles, and the desorption is accomplished by only turning the CO2 flow off...
April 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28448119/sulfur-nano-dots-stitched-in-2d-bubble-like-interconnected-carbon-fabric-as-reversibility-enhanced-cathodes-for-lithium-sulfur-batteries
#9
Feng Wu, Yusheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuanyuan Zhao, Li Li, Lei Wei, Rui Luo, Yongxin Huang, Yi Xing, Renjie Chen
The behavior of two-dimensional (2D) materials for energy-storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium sulfur batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultra-thin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448089/bone-degeneration-and-its-recovery-in-smp30-gnl-knockout-mice
#10
K Nishijima, T Ohno, A Amano, Y Kishimoto, Y Kondo, A Ishigami, S Tanaka
Senescence marker protein-30 (SMP30) decreases androgen-independently with aging and is a lactone-hydrolyzing enzyme gluconolactonase (GNL) that is involved in vitamin C biosynthesis. In the present study, bone properties of SMP30/GNL knockout (KO) mice with deficiency in vitamin C synthesis were investigated to reveal the effects of SMP30/GNL and exogenous vitamin C supplementation on bone formation. Mineral content (BMC) and mineral density (BMD) of the mandible and femur of SMP30/GNL KO and wild-type mice at 2 and 3 months of age with or without vitamin C supplementation were measured by dual-energy X-ray absorptiometry...
2017: Journal of Nutrition, Health & Aging
https://www.readbyqxmd.com/read/28448030/synthesis-of-biocompatible-liquid-crystal-elastomer-foams-as-cell-scaffolds-for-3d-spatial-cell-cultures
#11
Marianne E Prévôt, Senay Ustunel, Leah E Bergquist, Richard Cukelj, Yunxiang Gao, Taizo Mori, Lindsay Pauline, Robert J Clements, Elda Hegmann
Here, we present a step-by-step preparation of a 3D, biodegradable, foam-like cell scaffold. These scaffolds were prepared by cross-linking star block co-polymers featuring cholesterol units as side-chain pendant groups, resulting in smectic-A (SmA) liquid crystal elastomers (LCEs). Foam-like scaffolds, prepared using metal templates, feature interconnected microchannels, making them suitable as 3D cell culture scaffolds. The combined properties of the regular structure of the metal foam and of the elastomer result in a 3D cell scaffold that promotes not only higher cell proliferation compared to conventional porous templated films, but also better management of mass transport (i...
April 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28448024/synthesis-of-hydrogels-with-antifouling-properties-as-membranes-for-water-purification
#12
Thien N Tran, Sankara N Ramanan, Haiqing Lin
Hydrogels have been widely utilized to enhance the surface hydrophilicity of membranes for water purification, increasing the antifouling properties and thus achieving stable water permeability through membranes over time. Here, we report a facile method to prepare hydrogels based on zwitterions for membrane applications. Freestanding films can be prepared from sulfobetaine methacrylate (SBMA) with a crosslinker of poly(ethylene glycol) diacrylate (PEGDA) via photopolymerization. The hydrogels can also be prepared by impregnation into hydrophobic porous supports to enhance the mechanical strength...
April 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28448020/analysis-of-lymphocyte-extravasation-using-an-in-vitro-model-of-the-human-blood-brain-barrier
#13
Andreas Schulte-Mecklenbeck, Urvashi Bhatia, Tilman Schneider-Hohendorf, Nicholas Schwab, Heinz Wiendl, Catharina C Gross
Lymphocyte extravasation into the central nervous system (CNS) is critical for immune surveillance. Disease-related alterations of lymphocyte extravasation might result in pathophysiological changes in the CNS. Thus, investigation of lymphocyte migration into the CNS is important to understand inflammatory CNS diseases and to develop new therapy approaches. Here we present an in vitro model of the human blood-brain barrier to study lymphocyte extravasation. Human brain microvascular endothelial cells (HBMEC) are confluently grown on a porous polyethylene terephthalate transwell insert to mimic the endothelium of the blood-brain barrier...
April 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447989/fabrication-of-extracellular-matrix-derived-foams-and-microcarriers-as-tissue-specific-cell-culture-and-delivery-platforms
#14
Anna Kornmuller, Cody F C Brown, Claire Yu, Lauren E Flynn
Cell function is mediated by interactions with the extracellular matrix (ECM), which has complex tissue-specific composition and architecture. The focus of this article is on the methods for fabricating ECM-derived porous foams and microcarriers for use as biologically-relevant substrates in advanced 3D in vitro cell culture models or as pro-regenerative scaffolds and cell delivery systems for tissue engineering and regenerative medicine. Using decellularized tissues or purified insoluble collagen as a starting material, the techniques can be applied to synthesize a broad array of tissue-specific bioscaffolds with customizable geometries...
April 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447983/high-temperature-fabrication-of-nanostructured-yttria-stabilized-zirconia-ysz-scaffolds-by-in-situ-carbon-templating-xerogels
#15
Sixbert P Muhoza, Matthew A Cottam, Michael D Gross
We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m(2)·g(-1). An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon...
April 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447291/investigation-of-contact-characteristics-and-frictional-properties-of-natural-articular-cartilage-at-two-different-surface-configurations
#16
Shanhua Qian, Liyong Zhang, Zi Feng Ni, Chuanhui Huang, Dekun Zhang
Natural cartilage surfaces were macroscopically curved with multi-porous viscoelastic biologic materials with extremely high water, but whether curved surface configuration could play an important role on the contact and frictional properties of natural cartilages fails to be completely understood up to now. In this current study, cartilage samples came from the 18-24 month-old bovine femora. Contact characteristic and frictional properties at two cartilage configurations were investigated using the UMT-2 testing rig and the five-point sliding average method would be adopted to analyze these tested data...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28446343/from-short-electrospun-nanofibers-to-ultralight-aerogels-with-tunable-pore-structure
#17
Fabian Deuber, Christian Adlhart
Nanofiber production by electrospinning has made great progress over the past two decades. Recently the research area was revolutionized by a novel post-processing approach. By cutting the endless and intertwined nanofibers into short pieces, it is now possible to reassemble them into interconnected 3D structures. Such highly porous structures are built from dispersed short nanofibers by freeze-casting. This solid templating process controls the structures' ultimate properties and architecture in terms of primary and secondary pores below 5 μm and between 10 and 300 μm, respectively...
April 26, 2017: Chimia
https://www.readbyqxmd.com/read/28445639/toward-covalent-organic-frameworks-bearing-three-different-kinds-of-pores-the-strategy-for-construction-and-cof-to-cof-transformation-via-heterogeneous-linker-exchange
#18
Cheng Qian, Qiao-Yan Qi, Guo-Fang Jiang, Fu-Zhi Cui, Yuan Tian, Xin Zhao
Covalent organic frameworks (COFs) are an emerging class of crystalline porous organic materials which are fabricated via reticular chemistry. Their topologic structures can be precisely predicted on the basis of the structures of building blocks. However, constructing COF with complicated structures has remained a great challenge, due to the limited strategies that can access to structural complexity of COFs. In this work, we have developed a new approach to produce COFs bearing three different kinds of pores...
April 26, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28445607/fractal-characteristics-of-the-microvascular-network-a-useful-index-to-assess-vascularization-level-of-porous-silk-fibroin-biomaterial
#19
Kuihua Zhan, Lun Bai, Qinqin Wu, Derong Lei, Guangqian Wang
The neovascularization of biomaterials for tissue engineering is not only related to growth of capillaries but also involves appropriate hierarchy distribution of the microvessels. In this study, we proposed hierarchy distribution contrast method which can assess vascular transport capacity, in order to examine the hierarchy distribution of the neovessels during vascularization of the porous silk fibroin biomaterials implanted into rats and its evolution. The results showed that the fractal characteristics appeared toward the end of the vascularization stages, and the structure of the microvascular network after 3 weeks of implantation was similar to the fractal microvascular tree with bifurcation exponent x=3 and fractal dimension D=1...
April 26, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28444937/soluble-inorganic-nanoparticle-constructed-porous-coordination-frameworks-as-homogenized-heterogeneous-photocatalysts-for-suzuki-coupling-reaction-under-near-infrared-light
#20
Baodui Wang, Yuting Luo, Yong Peng, Weisheng Liu, Fengjuan Chen
Self-assembly has emerged as a promising method to control the structure and properties of ensembles of inorganic nanoparticles (NPs) for exploiting their collective effects. However, the rational assembly of inorganic NPs into soluble porous architectures as homogenized heterogeneous catalyst has been less studied. Here, we show that inorganic NPs can be used for the assembly of soluble porous coordination frameworks (PCFs) by atom-scale interfacial coordination-driven assembly strategy. Given large pore size, high dispersity in solution, strong absorption in the near-infrared range (NIR), and a long living electron-hole pair, the obtained soluble framework can serve as a platform for homogenize heterogeneous photocatalysts, which exhibited excellent activity, high apparent quantum efficiency, and recyclability to catalyze the noble metal free Suzuki coupling reaction under NIR light at room temperature...
April 26, 2017: Chemistry: a European Journal
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