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https://www.readbyqxmd.com/read/27933749/black-magic-in-gray-titania-noble-metal-free-photocatalytic-h2-evolution-from-hydrogenated-anatase
#1
Ning Liu, Xuemei Zhou, Nhat Truong Nguyen, Kristina Peters, Florian Zoller, Imgon Hwang, Christopher Schneider, Matthias E Miehlich, Detlef Freitag, Karsten Meyer, Dina Fattakhova-Rohlfing, Patrik Schmuki
'Black' TiO2 -in the widest sense, TiO2 reduced by various treatments-has attracted tremendous scientific interest in recent years because of some outstanding properties; most remarkably in photocatalysis. While the material effects visible light absorption (the blacker, the better), black titania produced by high pressure hydrogenation was recently reported to show another highly interesting feature; noble-metal-free photocatalytic H2 generation. In a systematic investigation of high-temperature hydrogen treatments of anatase nanoparticles, TEM, XRD, EPR, XPS, and photoelectrochemistry are used to characterize different degrees of surface hydrogenation, surface termination, electrical conductivity, and structural defects in the differently treated materials...
December 9, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27933684/enhancement-of-ag-based-plasmonic-photocatalysis-in-the-hydrogen-production-from-ammonia-borane-by-the-assist-of-single-site-ti-oxide-moiety-within-the-silica-framework
#2
Priyanka Verma, Yasutaka Kuwahara, Kohsuke Mori, Hiromi Yamashita
Ag nanoparticles (NPs) have gained great attention owing to their interesting plasmonic properties showing efficient catalysis under visible light irradiation. In this study, Ag-based plasmonic catalyst supported on the mesoporous silica involving isolated and tetrahedrally coordinated single-site Ti-oxide moieties, Ag/Ti-SBA-15, has been designed with the purpose of utilizing the broad spectrum range of solar energy. The Ti-SBA-15 support allows the deposition of small Ag NPs with a narrow size distribution...
December 9, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27933495/photocatalysis-of-s-metolachlor-in-aqueous-suspension-of-magnetic-cerium-doped-mtio2-core-shell-under-simulated-solar-light
#3
J Mermana, P Sutthivaiyakit, C Blaise, F Gagné, S Charnsethikul, P Kidkhunthod, S Sutthivaiyakit
Magnetic cerium-doped mesoporous titanium dioxide was synthesized by combining sol-gel method and calcination using tetrabutanate and ammonium cerium nitrate as precursors and Pluronic P123 as a template coating on iron oxide covered with carbon in ethanol. The magnetic Ce-doped catalyst showed only anatase structure with a slight increase in lattice parameters compared to the undoped catalyst. The Ce LIII-edge X-ray absorption near-edge spectroscopy (XANES) spectra showed Ce(3+), and the cerium substitution doping into titanium dioxide was proposed...
December 8, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27931721/mesoporous-silica-fillers-and-resin-composition-effect-on-dental-composites-cytocompatibility
#4
Nina Attik, Franck Hallay, Laurence Bois, Arnaud Brioude, Brigitte Grosgogeat, Pierre Colon
OBJECTIVE: Many new dental composites containing mesoporous silica fillers have been developed to improve rheological properties and enhance the resin-filler interface. To investigate the correlation between the cytocompatibility of several dental composites and their composition; two aspects have been considered: presence of bisphenol A (BPA)-glycidyl methacrylate (Bis-GMA) or triethyleneglycol-dimethacrylate (TEGDMA) among the resin monomers and presence of porous particles among the filler blends...
December 5, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27930852/a-modulator-induced-defect-formation-strategy-to-hierarchically-porous-metal-organic-frameworks-with-high-stability
#5
Guorui Cai, Hai-Long Jiang
The pore size enlargement and structural stability have been recognized as two crucial targets, which are rarely achieved together, in the development of metal-organic frameworks (MOFs). Herein, we have developed a versatile modulator-induced defect-formation strategy, in the presence of monocarboxylic acid as a modulator and an insufficient amount of organic ligand, successfully realizing the controllable synthesis of hierarchically porous MOFs (HP-MOFs) with high stability and tailorable pore characters. Remarkably, the integration of high stability and large mesoporous property enables these HP-MOFs to be important porous platforms for applications involving large molecules, especially in catalysis...
December 8, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27929171/biobr-nanoplates-tio2-nanowires-carbon-fiber-cloth-as-a-functional-water-transport-network-for-continuous-flow-water-purification
#6
Yan Mei, Yanhui Su, Zheng Li, Shiqi Bai, Mengyu Yuan, Lu Li, Zheng Yan, Jun Wu, Lian-Wen Zhu
A novel BiOBr@TiO2/carbon hybrid framework as a continuous flow sunlight water purification system has been reported in the present work. The BiOBr@TiO2/carbon hybrid framework was fabricated via the sequential growth of TiO2 nanowires and BiOBr nanoplates on carbon fiber cloth. TiO2 nanowires interweaved with carbon fibers to form a porous network, while BiOBr nanoplates were arrayed on TiO2 nanowires. The obtained BiOBr@TiO2/carbon hybrid framework possesses numerous micro/nanochannels between their adjacent one-dimensional building blocks, which can serve as an effective water transport network driven by capillary force...
December 8, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27928496/bioactive-mesoporous-wollastonite-particles-for-bone-tissue-engineering
#7
S Saravanan, Nagarajan Selvamurugan
The current investigation was aimed at identifying the role of mesoporous wollastonite particles on the healing of rat tibial bone defect. The bone defect was created with a 3-mm-diameter dental drill, and it was filled with mesoporous wollastonite particles. After second and fourth weeks of filling treatments, it was found that mesoporous wollastonite particles promoted bone formation as evidenced by X-ray, histological, scanning electron microscope, and energy-dispersive spectra studies. X-ray study showed the closure of drill hole as seen by high-dense radio-opacity image...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27925360/hierarchical-mesoporous-sno2-nanosheets-on-carbon-cloth-a-robust-and-flexible-electrocatalyst-for-co2-reduction-with-high-efficiency-and-selectivity
#8
Fengwang Li, Lu Chen, Gregory P Knowles, Douglas R MacFarlane, Jie Zhang
Electrochemical reduction of CO2 into liquid fuels is a promising approach to achieve a carbon-neutral energy cycle. However, conventional electrocatalysts usually suffer from low energy efficiency and poor selectivity and stability. A 3D hierarchical structure composed of mesoporous SnO2 nanosheets on carbon cloth is proposed to efficiently and selectively electroreduce CO2 to formate in aqueous media. The electrode is fabricated by a facile combination of hydrothermal reaction and calcination. It exhibits an unprecedented partial current density of about 45 mA cm(-2) at a moderate overpotential (0...
December 7, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27925314/a-simple-approach-to-develop-tailored-mesoporosity-in-nanostructured-heteropolysalts
#9
Juan Alcaniz-Monge
In this work, we describe a very simple approach to develop tailored mesoporosity in any nanostructured heteropolysalt with control over both the mesoporous volume and the pore size. This approach consisting in a treatment of the solid microporous precursor with a basic agent has been tested on the ammonium salt of the Keggin-type [PMo12O40]3- heteropolyanion, and constitutes a novel procedure for the preparation of mesoporous solids with no precedents in the literature. The results obtained in this study allows for extracting two main conclusions: (i) The micro- and mesoporosity structures in the heteropolysalt nanoparticles are independent from each other; and (ii) The development of mesoporosity in the solid material must be related with a process of alkaline degradation within the core of the nanocrystals aggregating into the particles...
December 7, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27924340/exosome-like-silica-nanoparticles-a-novel-ultrasound-contrast-agent-for-stem-cell-imaging
#10
Fang Chen, Ming Ma, Junxin Wang, Fang Wang, Shi-Xiong Chern, Eric Ruike Zhao, Anamik Jhunjhunwala, Sean Darmadi, Hangrong Chen, Jesse V Jokerst
Ultrasound is critical in many areas of medicine including obstetrics, oncology, and cardiology with emerging applications in regenerative medicine. However, one critical limitation of ultrasound is the low contrast of target tissue over background. Here, we describe a novel cup-shaped silica nanoparticle that is reminiscent of exosomes and that has significant ultrasound impedance mismatch for labelling stem cells for regenerative medicine imaging. These exosome-like silica nanoparticles (ELS) were created through emulsion templating and the silica precursors bis(triethoxysilyl)ethane (BTSE) and bis(3-trimethoxysilyl-propyl)amine (TSPA)...
December 7, 2016: Nanoscale
https://www.readbyqxmd.com/read/27924339/electrosprayed-tio2-nanoporous-hemispheres-for-enhanced-electron-transport-and-device-performance-of-formamidinium-based-perovskite-solar-cells
#11
Tao Ye, Shaoyang Ma, Xi Jiang, Miloš Petrović, Chellappan Vijila, Seeram Ramakrishna, Lei Wei
Titanium dioxide (TiO2) nanoporous hemispheres (NHSs) with a radius of ∼200 nm are fabricated by electrospraying a hydrothermally synthesized TiO2 nanoparticle (NP) suspension solution. The resulting TiO2 NHSs are highly porous, which are beneficial to the infiltration of perovskites and provide a larger contact area, as building blocks to construct a mesoporous TiO2 layer for FA0.81MA0.15Pb(I0.836Br0.15)3 based perovskite solar cells (PSCs). By varying the TiO2 NHS collecting period (15 s, 30 s, 60 s and 90 s) during the electrospraying process, the performance of PSCs changes with different TiO2 NHS distribution densities...
December 7, 2016: Nanoscale
https://www.readbyqxmd.com/read/27921332/metal-organic-framework-impregnated-with-binary-ionic-liquid-for-safe-proton-conduction-above-100-oc
#12
Xiao-Li Sun, Wei-Hua Deng, Hui Chen, Hong-Liang Han, Jared M Taylor, Chong-Qing Wan, Gang Xu
To develop proton conducting materials under low humidity condition and moderate working temperature still remains challenging for fuel-cell technology. Herein, we show a new type of proton-conducting material, EIMS-HTFSA@MIL, which was prepared by impregnating binary ionic liquids, EIMS-HTFSA, into mesoporous metal-organic framework, MIL-101. Taking advantages of the ionic liquid, such as high thermal stability, non-volatility, non-flammability and low corrosivity, EIMS-HTFSA@MIL shows potential application on proton conduction above 100 oC as a safe electrolyte...
December 5, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27920890/mesoporous-silica-nanoparticles-equipped-with-surface-nanovalves-for-ph-controlled-liberation-of-doxorubicin
#13
N V Roik, L A Belyakova
Silica carriers equipped with molecular and supramolecular pH-sensitive nanovalves were designed by combination of sol-gel synthesis and selective postsynthetic modification. Mesoporous structure of synthesized materials was characterized by low-temperature nitrogen adsorption-desorption, small-angle X-ray diffraction and transmission electron microscopy. Chemical immobilization of N-[N'-(N'-phenyl)-2-aminophenyl]aminoalkyl groups was confirmed by IR spectral and chemical analyses of surface layer. Loading and release behaviour of synthesized drug carriers was studied in phosphate buffer solutions with pH 5...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27920531/in-vitro-evaluation-of-folic-acid-conjugated-redox-responsive-mesoporous-silica-nanoparticles-for-the-delivery-of-cisplatin
#14
Merlis P Alvarez-Berríos, Juan L Vivero-Escoto
The use of cisplatin(IV) prodrugs for the delivery of cisplatin have gained significant attention, because of their low toxicity and reactivity. Recent studies have shown that targeted cisplatin(IV)-prodrug nanoparticle-based delivery systems can improve the internalization of the cisplatin(IV) prodrug. We hypothesized that folic acid-conjugated mesoporous silica nanoparticles (MSNs) containing cisplatin(IV) prodrug could target cancer cells that overexpress the folate receptor and deliver the active cisplatin drug upon intracellular reduction...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27918987/surfactant-assisted-selective-etching-strategy-for-generation-of-rattle-like-mesoporous-silica-nanoparticles
#15
Xingwen Liu, Zheng Jiao, Tingting Song, Minghong Wu, Haijiao Zhang
Nowadays, rattle-like or so-called yolk-shell nanostructures have set off a new wave of research in view of their prominent features including large surface area, tunable void and flexible functional core, etc. Herein, rattle-like mesoporous silica nanoparticles (RMSNs) with a pure silica core, a hollow cavity and a mesoporous shell have been successfully fabricated via a surfactant-assisted selective etching strategy. The synthetic approach involves the preparation of solid silica spheres with three-layer different structural silica containing the inner core of pure silica, middle layer of hybrid silica and outer shell of surfactant/SiO2 composite, followed by a hydrothermal treatment in hot water...
November 24, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27918936/promoting-angiogenesis-with-mesoporous-microcarriers-through-a-synergistic-action-of-delivered-silicon-ion-and-vegf
#16
Khandmaa Dashnyam, Guang-Zhen Jin, Joong-Hyun Kim, Roman Perez, Jun-Hyeog Jang, Hae-Won Kim
Angiogenic capacity of biomaterials is a key asset to drive vascular ingrowth during tissue repair and regeneration. Here we design a unique angiogenic microcarrier based on sol-gel derived mesoporous silica. The microspheres offer a potential angiogenic stimulator, Si ion, 'intrinsically' within the chemical structure. Furthermore, the highly mesoporous nature allows the loading and release of angiogenic growth factor 'extrinsically'. The Si ion is released from the microcarriers at therapeutic ranges (over a few ppm per day), which indeed up-regulates the expression of hypoxia inducing factor 1α (HIF1α) and stabilizes it by blocking HIF-prolyl hydroxylase 2 (PHD2) in HUVECs...
November 28, 2016: Biomaterials
https://www.readbyqxmd.com/read/27916740/development-of-europium-doped-core-shell-silica-cobalt-ferrite-functionalized-nanoparticles-for-magnetic-resonance-imaging
#17
Bhavesh D Kevadiya, Aditya N Bade, Christopher Woldstad, Benson J Edagwa, JoEllyn M McMillan, Balasrinivasa R Sajja, Michael D Boska, Howard E Gendelman
: The size, shape and chemical composition of europium (Eu(3+)) cobalt ferrite (CFEu) nanoparticles were optimized for use as a "multimodal imaging nanoprobe" for combined fluorescence and magnetic resonance bioimaging. Doping Eu(3+) ions into a CF structure imparts unique bioimaging and magnetic properties to the nanostructure that can be used for real-time screening of targeted nanoformulations for tissue biodistribution assessment. The CFEu nanoparticles (size ∼7.2 nm) were prepared by solvothermal techniques and encapsulated into poloxamer 407-coated mesoporous silica (Si-P407) to form superparamagnetic monodisperse Si-CFEu nanoparticles with a size of ∼ 140 nm...
December 1, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27916695/the-advantage-of-hollow-mesoporous-carbon-as-a-near-infrared-absorbing-drug-carrier-in-chemo-photothermal-therapy-compared-with-ir-820
#18
Qinfu Zhao, Xiudan Wang, Yue Yan, Da Wang, Ying Zhang, Tongying Jiang, Siling Wang
In this study, we synthesized a kind of hollow mesoporous carbon (HMC) as near-infrared (NIR) nanomaterial and made a comparison between HMC and IR-820 commercially available in terms of heat generation properties and thermal stability exposed under NIR laser irradiation. The NIR-induced photothermal tests indicated that HMC had excellent heat generating capacity and remained stable after exposed to NIR laser irradiation for several times. On the contrary, the IR-820 was thermal unstable and degraded completely after exposed to NIR laser irradiation for only one time...
December 1, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27914251/improved-rhbmp-2-function-on-mbg-incorporated-tio2-nanorod-films
#19
Fei Ge, Mengfei Yu, Cuixia Yu, Jun Lin, Wenjian Weng, Kui Cheng, Huiming Wang
In the process of biomaterials mediated bone regeneration, rhBMP-2 delivery at efficient dose in sustained kinetics is crucial for promoting cell osteogenic differentiation. Meanwhile, surface morphology of the biomaterials could regulate cellular responses as well as strengthen the rhBMP-2 interaction with cells for better bone induction. Herein, TiO2 nanorod films with varied mesoporous bioactive glass (MBG) incorporation amount were designed to strengthen the efficacy of rhBMP-2, basing on optimized loading/release behaviors and surface nanostructure cooperatively...
November 24, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27913308/biodegradable-magnetic-silica-iron-oxide-nanovectors-with-ultra-large-mesopores-for-high-protein-loading-magnetothermal-release-and-delivery
#20
Haneen Omar, Jonas G Croissant, Kholod Alamoudi, Shahad Alsaiari, Ibrahim Alradwan, Majed A Majrashi, Dalaver H Anjum, Patricia Martins, Basem Moosa, Abdulaziz Almalik, Niveen M Khashab
The delivery of large cargos of diameter above 15nm for biomedical applications has proved challenging since it requires biocompatible, stably-loaded, and biodegradable nanomaterials. In this study, we describe the design of biodegradable silica-iron oxide hybrid nanovectors with large mesopores for large protein delivery in cancer cells. The mesopores of the nanomaterials spanned from 20 to 60nm in diameter and post-functionalization allowed the electrostatic immobilization of large proteins (e.g. mTFP-Ferritin, ~534kDa)...
November 29, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
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