keyword
MENU ▼
Read by QxMD icon Read
search

Mesoporous

keyword
https://www.readbyqxmd.com/read/28723096/nickel-particles-selectively-confined-in-the-mesoporous-channels-of-sba-15-yielding-a-very-stable-catalyst-for-drm-reaction
#1
Alberto Rodriguez-Gomez, Rosa Pereñiguez, Alfonso Caballero
A series of four Ni catalysts supported on SBA-15 and on a high surface area SiO2 have been prepared by modified impregnation (ImU) and deposition-precipitation (DP) methods. The catalysts have been extensively characterized, including in situ XAS and XPS techniques, and their catalytic activities evaluated in the dry reforming reaction of methane (DRM). The combined use of a surface sensitive technique (XPS) with a bulk sensitive one (XAS) has allowed to determine the location of nickel particles on each catalyst after reduction at high temperature (750 oC)...
July 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28723093/plasmonic-aerogels-as-a-3d-nanoscale-platform-for-solar-fuels-photocatalysis
#2
Paul A DeSario, Jeremy J Pietron, Adam Dunkelberger, Todd H Brintlinger, Olga Baturina, Rhonda M Stroud, Jeffrey C Owrutsky, Debra R Rolison
We use plasmonic Au-TiO2 aerogels as a platform in which to marry synthetically thickened particle-particle junctions in TiO2 aerogel networks and Au||TiO2 interfaces and then investigate their cooperative influence on photocatalytic hydrogen (H2) generation under both broadband (i.e., UV + visible light) and visible-only excitation. In doing so, we elucidate the dual functions that incorporated Au can play as a water reduction/H2 generation co-catalyst and as a plasmonic sensitizer. We also introduce non-plasmonic Pt co-catalyst nanoparticles into our composite aerogels in order to leverage the catalytic water-reducing abilities of Pt...
July 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28722436/potential-to-detect-hydrogen-concentration-gradients-with-palladium-infused-mesoporous-titania-on-d-shaped-optical-fiber
#3
Zsolt L Poole, Paul R Ohodnicki, Aidong Yan, Yuankun Lin, Kevin P Chen
A distributed sensing capable high temperature D-shaped optical fiber modified with a palladium nanoparticle sensitized mesoporous (∼5 nm) TiO2 film, is demonstrated. The refractive index of the TiO2 film was reduced using block copolymer templating in order to realize a mesoporous matrix, accommodating integration with optical fiber. The constructed sensor was analyzed by performing direct transmission loss measurements, and by analyzing the behavior of an integrated fiber Bragg grating. The inscribed grating should reveal whether the refractive index of the composite film experiences changes upon exposure to hydrogen...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722257/mesoporous-tin-based-oxide-nanospheres-and-graphene-composites-as-advanced-anodes-for-lithium-ion-half-full-and-sodium-ion-batteries
#4
Yanyan He, Aihua Li, Caifu Dong, Chuanchuan Li, Liqiang Xu
The large volume variations of tin-based oxides hinder their extensive applications in the field of lithium ion batteries (LIBs). In this study, structure design, hybrid fabrication and carbon coating approaches have been simultaneously adopted to relieve these weaknesses. Therefore, uniform mesoporous NiO/SnO2@rGO, Ni-Sn oxide@rGO and SnO2@rGO nanosphere composites have been selectively fabricated. Among them, the obtained NiO/SnO2@rGO composite exhibits high capacity 800 mAh g-1 at 1000 mA g-1 after 400 cycles...
July 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28719857/in-situ-adjuvant-therapy-using-a-responsive-doxorubicin-loaded-fibrous-scaffold-after-tumor-resection
#5
Ziming Yuan, Wei Wu, Zhongwei Zhang, Zhiyong Sun, Ruoyu Cheng, Guoqin Pan, Xuemin Wang, Wenguo Cui
As tumor microenvironment becoming more and more important in tumor study, the acid pH around or in solid tumors drew lots of attentions. And the progress of drug delivery systems made the responsive-release possible. This time, we fabricated a new-type composite electrospun poly (L-lactide) (PLLA) fibrous scaffolds, that blent with the mesoporous silica particles (MSNs). Further more, we used sodium bicarbonate (SB) as acid sensitive agent which was wrapped inside the MSNs. And doxorubicin (DOX) was also wrapped into MSNs in order to achieve a sustained release to inhibit tumors in mice, which mimicked the remnant breast cancer with surgery...
July 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719750/electrostatic-interaction-assisted-construction-of-3d-networks-of-manganese-dioxide-nanosheets-for-flexible-high-performance-solid-state-asymmetric-supercapacitors
#6
Na Liu, Yan Li Su, Zhiqiang Wang, Zhen Wang, Jinsong Xia, Yong Chen, Zhigang Zhao, Qingwen Li, Fengxia Geng
A three-dimensional (3D) macroscopic network of manganese oxide MnO2 sheets was firstly synthesized by an easily scalable solution approach, grafting the negatively charged surfaces of the MnO2 sheets with an aniline monomer by electrostatic interactions followed by a quick chemical oxidizing polymerization reaction. The obtained structure possessed MnO2 sheets interconnected with polyaniline chains, producing a 3D monolith rich of mesopores. The MnO2 sheets had almost all their reactive centers exposed on the electrode surface, combining with the electron transport highways provided by polyaniline and the shortened diffusion paths provided by the porous structure, the deliberately designed electrode achieved excellent capacitance of 762 F g-1 at a current of 1 A g-1 and cycling performance with a capacity retention of 90% over 8000 cycles...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719745/highly-efficient-water-decontamination-by-using-sub-10-nm-feooh-confined-within-millimeter-sized-mesoporous-polystyrene-beads
#7
Xiaolin Zhang, Cheng Cheng, Jieshu Qian, Zhenda Lu, Siyuan Pan, Bing-Cai Pan
Millimeter-sized polymer-based FeOOH nanoparticles (NPs) provide a promising option to overcome the bottlenecks of direct use of NPs in scaled-up water purification, and decreasing the NP size below 10 nm is expected to improve the decontamination efficiency of the polymeric nanocomposites due to the size and surface effect. However, it is still challenging to control the dwelled FeOOH NP sizes to sub-10 nm, mainly due to the wide pore size distribution of the currently available polymeric hosts. Herein, we synthesized mesoporous polystyrene beads (MesoPS) via flash freezing to assemble FeOOH NPs...
July 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28719071/mesoporous-silica-thin-membranes-with-large-vertical-mesochannels-for-nanosize-based-separation
#8
Yupu Liu, Dengke Shen, Gang Chen, Ahmed A Elzatahry, Manas Pal, Hongwei Zhu, Longlong Wu, Jianjian Lin, Daifallah Al-Dahyan, Wei Li, Dongyuan Zhao
Membrane separation technologies are of great interest in industrial processes such as water purification, gas separation, and materials synthesis. However, commercial filtration membranes have broad pore size distributions, leading to poor size cutoff properties. In this work, mesoporous silica thin membranes with uniform and large vertical mesochannels are synthesized via a simple biphase stratification growth method, which possess an intact structure over centimeter size, ultrathin thickness (≤50 nm), high surface areas (up to 1420 m(2) g(-1) ), and tunable pore sizes from ≈2...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28718630/designed-formulation-of-se-impregnated-nitrogen-containing-hollow-core-mesoporous-shell-carbon-spheres-multifunctional-potential-cathode-for-li-se-and-na-se-batteries
#9
Balakumar Kalimuthu, Kalaiselvi Nallathamby
Nitrogen containing carbon spheres with hollow core and mesoporous shell (NHCS), capable of confining Se as high as 72 wt.% has been demonstrated to exhibit appreciable electrochemical behaviour with 52 and 61 wt.% Se loading. In particular, 52 wt.% Se confined NHCS cathode exhibits 265 mAh/g at 10C rate and retains 75% of initial capacity at 2C rate up to 10000 cycles with an insignificant decay of 0.0025% per cycle, which is an ever first report on the extended cycle life of Li-Se batteries. Due to the negligible difference found between the transport kinetics of Se and that of Li2Se, irrespective of the cycling rate, 52 wt...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28715862/phenyl-and-ionic-liquid-based-bifunctional-periodic-mesoporous-organosilica-supported-copper-an-efficient-nanocatalyst-for-clean-production-of-polyhydroquinolines
#10
Dawood Elhamifar, Hakimeh Ardeshirfard
A novel phenyl and ionic liquid based bifunctional periodic mesoporous organosilica supported copper (Cu@BPMO-Ph-IL) is prepared, characterized and its catalytic application is developed in the clean production of polyhydroquinolines. The Cu@BPMO-Ph-IL was prepared via chemical grafting of ionic liquid groups onto phenyl-based PMO followed by treatment with copper acetate. This nanocatalyst was characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), thermal gravimetric analysis (TGA), powder X-ray diffraction (PXRD), nitrogen-sorption and energy dispersive X-ray (EDX) analyses...
July 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28715619/properties-of-water-confined-in-periodic-mesoporous-organosilicas-nanoimprinting-the-local-structure
#11
Michael Fröba, J Benedikt Mietner, Felix J Brieler, Young Joo Lee
The properties of materials confined in porous media are important in scientific and technological aspects. Topology, size and surface polarity of the pores play a critical role in the confinement effects, however, knowledge regarding the guest-pore interface structure is still lacking. Here, we show that the molecular mobility of water confined in periodic mesoporous organosilicas (PMOs) is influenced by the polarity of the organic moiety. Multidimensional solid state NMR directly probes the spatial arrangement of water inside the pores, demonstrating that water interacts either with only the silicate layer or with both silicate and organic layers depending on the alternating surface polarity...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28715176/a-fast-and-scalable-approach-for-synthesis-of-hierarchical-porous-zeolitic-imidazolate-frameworks-and-one-pot-encapsulation-of-target-molecules
#12
Hani Nasser Abdelhamid, Zhehao Huang, Ahmed M El-Zohry, Haoquan Zheng, Xiaodong Zou
A trimethylamine (TEA)-assisted synthesis approach that combines the preparation of hierarchical porous zeolitic imidazolate framework ZIF-8 nanoparticles and one-pot encapsulation of target molecules is presented. Two dye molecules, rhodamine B (RhB) and methylene blue (MB), and one protein (bovine serum albumin, BSA) were tested as the target molecules. The addition of TEA into the solution of zinc nitrate promoted the formation of ZnO nanocrystals, which rapidly transformed to ZIF-8 nanoparticles after the addition of the linker 2-methylimidazole (Hmim)...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28715170/double-soft-template-synthesis-of-nitrogen-sulfur-codoped-hierarchically-porous-carbon-materials-derived-from-protic-ionic-liquid-for-supercapacitor
#13
Li Sun, Hua Zhou, Li Li, Ying Yao, Haonan Qu, Chengli Zhang, Shanhu Liu, Yanmei Zhou
Heteroatom-doped hierarchical porous carbon materials derived from the potential precursors and prepared by a facile, effective and low-pollution strategy have recently been particularly concerned in different research fields. In this study, the interconnected nitrogen/sulfur-codoped hierarchically porous carbon materials have been successfully obtained via one-step carbonization of the self-assembly of [Phne][HSO4] (a protic ionic liquid originated from dilute sulfuric acid and phenothiazine by a straight-forward acid-base neutralization) and the double soft-template of OP-10 and F-127...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714999/enhanced-durability-of-an-iridium-bipyridine-complex-embedded-into-organosilica-nanotubes-for-water-oxidation
#14
Shengbo Zhang, Hua Wang, Mei Li, Jinyu Han, Shinji Inagaki, Xiao Liu
Heterogeneous metal complex catalysts for the water oxidation reaction have ever been desired for the development of devices simulating photosynthesis. This paper describes the design of highly active and robust heterogeneous iridium complex catalysts for chemical water oxidation. The heterogeneous catalyst (Ir-BPy-NT) was prepared by the post-synthetic metalation of bipyridine-containing mesoporous organosilica nanotubes (BPy-NT) with an [IrCp*Cl(μ-Cl)]2 (Cp* = η(5)-pentamethylcyclopentadienyl) complex. The as-prepared Ir-BPy-NT catalyst showed enhanced durability with high reaction activity compared to the analogous homogeneous and the conventional heterogeneous ones, due to the stable nanotube structures as well as the isolated active sites...
July 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28714669/interconnected-hierarchical-zsm-5-with-tunable-acidity-prepared-by-a-dealumination-realumination-process-a-superior-mtp-catalyst
#15
Junjie Li, Min Liu, Xinwen Guo, Shutao Xu, Yingxu Wei, Zhongmin Liu, Chunshan Song
ZSM-5 that uses TPAOH as a template has an Al-rich exterior and defective Si-rich interior, thus it decouples the alkaline treatment difficulties of Al-rich and Si-rich crystals. Alkaline treatment selectively removed the Si-rich interior while the Al-rich exterior was protected, this catalyst showed no change in stability comparing with parent ZSM-5 during the MTP reaction that attributed to enclosed hollow structure and acidity-rich exterior. Pre-treatment by NH4F, however, both removed defective Si-sites and caused distortion in tetrahedral aluminum that made the outer shell susceptible to alkaline treatment...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28714453/preparation-of-nitrogen-and-sulfur-co-doped-ordered-mesoporous-carbon-for-enhanced-microwave-absorption-performance
#16
Xiaoyan Yuan, Xingkun Xue, Hailong Ma, Shouwu Guo, Laifei Cheng
Ordered mesoporous carbon nanomaterials (OMCs) co-doped with homogeneous nitrogen and sulfur heteroatoms were prepared by nanocasting with the pyrrole oligomer catalyzed by sulfuric acid as a precursor and ordered mesoporous silica SBA-15 as a hard-template. By multi-technique approach utilization, it was demonstrated that the N and S co-doped OMCs possessed high ordered mesoporous structures, large surface areas and homogeneous distribution of heteroatoms. As an microwave absorber, the as-prepared materials exhibited a minimum reflection loss (RL) of -32...
July 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28714232/intermediate-product-regulation-in-tandem-solid-catalysts-with-multimodal-porosity-for-high-yield-synthetic-fuel-production
#17
Nicolas Duyckaerts, Mathias Bartsch, Ioan-Teodor Trotus, Norbert Pfänder, Axel Lorke, Ferdi Schüth, Gonzalo Prieto
Tandem catalysis is an attractive strategy to intensify chemical processes but simultaneous control over the individual and concerted catalyst performances poses a challenge. We show that enhanced pore transport within a Co/Al2O3 Fischer-Tropsch (FT) catalyst with a hierarchical porosity enables its tandem integration with a Pt/ZSM-5 zeolitic hydrotreating catalyst in a spatially distant fashion - permitting a catalyst-specific temperature adjustment - albeit resembling a close active site proximity - by mitigating secondary reactions of primary FT α-olefin products...
July 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28713204/efficient-nh3-scr-removal-of-nox-with-highly-ordered-mesoporous-wo3-%C3%AF-ceo2-at-low-temperatures
#18
Sihui Zhan, He Zhang, Yu Zhang, Qiang Shi, Yi Li, XiuJun Li
To eliminate nitrogen oxides (NOx), a series of highly ordered mesoporous WO3(χ)-CeO2 nanomaterials (χ represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NOx with NH3 at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H2-TPR, NH3-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO3(χ)-CeO2 (χ = 0, 0.5, 0.75, 1 and 1.25) showed highly ordered mesoporous channels...
April 2017: Applied Catalysis. B, Environmental
https://www.readbyqxmd.com/read/28713017/intracellular-co-delivery-of-sr-ion-and-phenamil-drug-through-mesoporous-bioglass-nanocarriers-synergizes-bmp-signaling-and-tissue-mineralization
#19
Jung-Hwan Lee, Nandin Mandakhbayar, Ahmed El-Fiqi, Haw-Won Kim
Inducing differentiation and maturation of resident multipotent stem cells (MSCs) is an important strategy to regenerate hard tissues in mal-calcification conditions. Here we explore a co-delivery approach of therapeutic molecules comprised of ion and drug through a mesoporous bioglass nanoparticle (MBN) for this purpose. Recently, MBN has offered unique potential as a nanocarrier for hard tissues, in terms of high mesoporosity, bone bioactivity (and possibly degradability), tunable delivery of biomolecules, and ionic modification...
July 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28711857/methotrexate-f127-conjugated-mesoporous-zinc-hydroxyapatite-as-an-efficient-drug-delivery-system-for-overcoming-chemotherapy-resistance-in-osteosarcoma-cells
#20
Azadeh Meshkini, Hamid Oveisi
The resistance of cancer cells to chemotherapeutic agents and the poor selectivity of drugs toward tumor cells are regarded as the main impediments in successful cancer therapy. Currently, the design and fabrication of stimulus-responsive drug delivery systems with high specificity toward cancer cells are gaining increasing attention and they show a promising potential for clinical applications. In this study, mesoporous zinc-substituted hydroxyapatite has been synthesized and served as a drug delivery vehicle owing to its biocompatibility and high drug loading capacity...
July 4, 2017: Colloids and Surfaces. B, Biointerfaces
keyword
keyword
50667
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"