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https://www.readbyqxmd.com/read/28543821/synthesis-of-a-single-crystalline-macroporous-layered-silicate-from-macroporous-utl-type-zeolite-and-its-accelerated-intercalation
#1
Yusuke Asakura, Naoki Kawaura, Yoshiyuki Kuroda, Masakazu Koike, Hiroaki Wada, Atsushi Shimojima, Kazuyuki Kuroda
A single-crystalline macroporous layered silicate was obtained for the first time. Firstly, UTL-type zeolite with macropores was prepared hydrothermally under the presence of acetylene black as a macropore template and the subsequent calcination to remove the template. Double four-membered ring (d4r) units in the UTL framework were selectively dissolved to yield a layered silicate with macropores. Intercalation of tetrabutylammonium ions into the macroporous layered silicate is accelerated if compared with that into the same silicate without macropores, indicating the effectiveness of macropores due to easy diffusion...
May 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28539100/production-of-thermal-insulation-blocks-from-bottom-ash-of-fluidized-bed-combustion-system
#2
A K Mandal, O P Sinha
The issues of disposal and environmental problems are increased by the generation of bottom ash from the thermal power plants day by day; hence, its recycling is required. The present study aimed to make thermal insulation blocks using as raw material bottom ash and iron ore slime as a binder and to characterize their engineering properties. Two different fineness values of bottom ash were considered with varying amounts of iron ore slime (0-10%) to make the blocks. Blocks were dried followed by firing at 1000, 1100 and 1200°C, respectively...
May 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28535952/the-effects-of-different-opacifiers-on-the-translucency-of-experimental-dental-composite-resins
#3
Karine Haas, Gulelala Azhar, Duncan J Wood, Keyvan Moharamzadeh, Richard van Noort
OBJECTIVE: The aim of this study was to evaluate the effects of different opacifiers on the translucency of experimental dental composite-resins. METHODS: Three metal oxides that are used as opacifiers were tested in this study: titanium oxide (TiO2), aluminium oxide (Al2O3) and zirconium oxide (ZrO2). Experimental composite-resins were fabricated containing 25wt.% urethane dimethacrylate (UDMA)-based resin matrix and 75% total filler including different concentrations of metal oxides (0, 0...
May 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28535686/development-and-characterization-of-a-stable-adhesive-bond-between-a-poly-dimethylsiloxane-catheter-material-and-a-bacterial-biofilm-resistant-acrylate-polymer-coating
#4
Bonnie J Tyler, Andrew Hook, Andreas Pelster, Paul Williams, Morgan Alexander, Heinrich F Arlinghaus
Catheter associated urinary tract infections are the most common health related infections worldwide, contributing significantly to patient morbidity and mortality and increased health care costs. To reduce the incidence of these infections, new materials that resist bacterial biofilm formation are needed. A composite catheter material, consisting of bulk poly(dimethylsiloxane) (PDMS) coated with a novel bacterial biofilm resistant polyacrylate [ethylene glycol dicyclopentenyl ether acrylate (EGDPEA)-co-di(ethyleneglycol) methyl ether methacrylate (DEGMA)], has been proposed...
May 23, 2017: Biointerphases
https://www.readbyqxmd.com/read/28535065/silica-polymerization-from-supersaturated-dilute-aqueous-solutions-in-the-presence-of-alkaline-earth-salts
#5
Marina Kley, Andreas Kempter, Volodymyr Boyko, Klaus Huber
The early stages of silica polymerization in aqueous solution proceeds according to a mechanism based on three steps: nucleation, particle growth and agglomeration of the particles. Application of time-resolved static and dynamic light scattering as a powerful in-situ technique in combination with spectrophotometric analysis of the monomer consumption based on the molybdenum blue method was carried out to further investigate this 3-step process. Experiments were carried out at four different initial silicic acid contents covering a range between 350 ppm and 750 ppm in the presence of either 10 mM NaCl or 5 mM of a mixture of CaCl2 and MgCl2...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534635/ultrafast-carbon-dioxide-sorption-kinetics-using-lithium-silicate-nanowires
#6
Apolo Nambo, Juan He, Tu Quang Nguyen, Veerendra Atla, Thad L Druffel, Mahendra K Sunkara
In this paper, the Li4SiO4 nanowires (NW) were shown to be promising for CO2 capture with ultrafast kinetics. Specifically, the nanowire powders exhibited an uptake of 0.35 g g-1 of CO2 at ultra-fast adsorption rate of 0.22 g g-1 min-1 at 650-700°C. Lithium silicate (Li4SiO4) nanowires and nanopowders were synthesized using a "solvo-plasma" technique involving plasma oxidation of silicon precursors mixed with lithium hydroxide. The kinetic parameter values (k) extracted from sorption and desorption kinetics obtained using NW powders are one order of magnitude higher than those previously reported for the Li4SiO4-CO2 reaction system...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28533793/exogenous-supplementation-of-silicon-improved-the-recovery-of-hyperhydric-shoots-in-dianthus-caryophyllus-l-by-stabilizing-the-physiology-and-protein-expression
#7
Prabhakaran Soundararajan, Abinaya Manivannan, Yoon S Cho, Byoung R Jeong
Hyperhydricity is one of the major problems hindering in vitro propagation of Dianthus caryophyllus L. Silicon (Si) is a well-known beneficial element renowned for its stress amelioration properties in plants. This study has demonstrated the physiological and molecular mechanism behind the Si-mediated recovery from hyperhydricity in D. caryophyllus L. 'Green Beauty'. Four weeks old hyperhydric shoots obtained from temporary immersion system were cultured on the Murashige and Skoog medium supplemented with 0 (control), 1...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28533632/local-ph-monitoring-of-small-cluster-of-cells-using-a-fiber-optic-dual-core-micro-probe
#8
Sisi Chen, Qingbo Yang, Hai Xiao, Honglan Shi, Yinfa Ma
Biological studies of tissues and cells have enabled numerous discoveries, but these studies still bear potential risks of invalidation because of cell heterogeneity. Through high-accuracy techniques, recent studies have demonstrated that discrepancies do exist between the results from low-number-cell studies and cell-population-based results. Thus the urgent need to re-evaluate key principles on limited number of cells has been provoked. In this study, a novel designed dual-core fiber-optic pH micro-probe was fabricated and demonstrated for niche environment pH sensing with high spatial resolution...
March 31, 2017: Sensors and Actuators. B, Chemical
https://www.readbyqxmd.com/read/28532089/a-poly-2-hydroxyethyl-methacrylate-based-resin-improves-the-dentin-remineralizing-ability-of-calcium-silicates
#9
Paola Taddei, Carlo Prati, Maria Giovanna Gandolfi
Bioactive polymeric composites have received great attention for their capability to remineralize the dentin tissue. This study was aimed at evaluating if a poly(HEMA-co-TEGDMA) resin (HEMA: 2-hydroxyethyl methacrylate; TEGDMA: triethyleneglycol dimethacrylate) may increase the in vitro apatite forming ability of a calcium silicate cement (CaSi), in view of developing a hydrophilic light-curable composite bio-remineralizing restorative material (R-CaSi). To this purpose, the following experiments were carried out: (1) In vitro apatite forming ability of R-CaSi and CaSi was comparatively assessed by micro-Raman spectroscopy after immersion of the cement disks in Dulbecco's Phosphate Buffered Saline (DPBS) at 37°C for 1-28days; (2) Previously demineralized human dentin slices were soaked for 7days in close contact with the CaSi and R-CaSi cements as well as poly(HEMA), poly(TEGDMA) and poly(HEMA-co-TEGDMA), and then were comparatively analyzed by IR spectroscopy...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532061/wound-healing-effect-of-bioactive-ion-released-from-mg-smectite
#10
Yu Sasaki, Gulsan Ara Sathi, Osamu Yamamoto
Bioactive ions like Mg(2+) and Si(4+) have been known as promotion factors of tissue regeneration. In the present work, Mg-smectite, consisting of Mg(2+) and Si(4+) ions, was synthesized by a solution process, and evaluated for the efficiency of the powder on wound healing in rats. White precipitates were obtained by mixing a magnesium chloride hexahydrate solution and a sodium silicate hexahydrate solution at room temperature. The precipitates mixed with a NaOH aqueous solution were subjected to hydrothermal reaction, and finally crystalline Mg-smectite powder was obtained...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531209/the-dynamics-of-a-mediterranean-coralligenous-sponge-assemblage-at-decennial-and-millennial-temporal-scales
#11
Marco Bertolino, Gabriele Costa, Mirko Carella, Riccardo Cattaneo-Vietti, Carlo Cerrano, Maurizio Pansini, Gianluca Quarta, Lucio Calcagnile, Giorgio Bavestrello
This paper concerns the changes occurred over both decennial and millennial spans of time in a sponge assemblage present in coralligenous biogenic build-ups growing at 15 m depth in the Ligurian Sea (Western Mediterranean). The comparison of the sponge diversity after a time interval of about 40 years (1973-2014) showed a significant reduction in species richness (about 45%). This decrease affected mainly the massive/erect sponges, and in particular the subclass Keratosa, with a species loss of 67%, while the encrusting and cavity dwelling sponges lost the 36% and 50%, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28526443/mechanical-properties-of-polymer-infiltrated-ceramic-sodium-aluminum-silicate-composites-for-dental-restoration
#12
Bencang Cui, Jing Li, Huining Wang, Yuanhua Lin, Yang Shen, Ming Li, Xuliang Deng, Cewen Nan
OBJECTIVE: To fabricate indirect restorative composites for CAD/CAM applications and evaluate the mechanical properties. METHODS: Polymer-infiltrated-ceramic composites were prepared through infiltrating polymer into partially sintered sodium aluminum silicate ceramic blocks and curing. The corresponding samples were fabricated according to standard ISO-4049 using for mechanical properties measurement. The flexural strength and fracture toughness were measured using a mechanical property testing machine...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28524375/bioprinted-osteogenic-and-vasculogenic-patterns-for-engineering-3d-bone-tissue
#13
Batzaya Byambaa, Nasim Annabi, Kan Yue, Grissel Trujillo-de Santiago, Mario Moisés Alvarez, Weitao Jia, Mehdi Kazemzadeh-Narbat, Su Ryon Shin, Ali Tamayol, Ali Khademhosseini
Fabricating 3D large-scale bone tissue constructs with functional vasculature has been a particular challenge in engineering tissues suitable for repairing large bone defects. To address this challenge, an extrusion-based direct-writing bioprinting strategy is utilized to fabricate microstructured bone-like tissue constructs containing a perfusable vascular lumen. The bioprinted constructs are used as biomimetic in vitro matrices to co-culture human umbilical vein endothelial cells and bone marrow derived human mesenchymal stem cells in a naturally derived hydrogel...
May 19, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28516996/growth-of-two-dimensional-silica-and-aluminosilicate-bilayers-on-pd-111-from-incommensurate-to-commensurate-crystalline
#14
Jin-Hao Jhang, Chao Zhou, Omur E Dagdeviren, Gregory S Hutchings, Udo D Schwarz, Eric I Altman
Two-dimensional (2D) silica (SiO2) and aluminosilicate (AlSi3O8) bilayers grown on Pd(111) were fabricated and systematically studied using ultrahigh vacuum surface analysis in combination with theoretical methods, including Auger electron spectroscopy, X-ray photoelectron spectroscopy, low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and density functional theory. Based on LEED results, both SiO2 and AlSi3O8 bilayers start ordering above 850 K in 2 × 10(-6) Torr oxygen. Both bilayers show hexagonal LEED patterns with a periodicity approximately twice that of the Pd(111) surface...
May 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28516151/transport-mechanical-and-global-migration-data-of-multilayer-copolyamide-nanocomposite-films-with-different-layouts
#15
P Scarfato, E Garofalo, L Di Maio, L Incarnato
Transport, mechanical and global migration data concern multilayer food packaging films with different layouts, all incorporating a layered silicate/polyamide nanocomposite as oxygen barrier layer, and a low-density polyethylene (LDPE) as moisture resistant layer in direct contact with food. The data are related to "Tuning of co-extrusion processing conditions and film layout to optimize the performances of PA/PE multilayer nanocomposite films for food packaging" by Garofalo et al. (2017) [1]. Nanocomposite multilayer films, with different relative layer thicknesses and clay types, were produced using a laboratory scale co-extrusion blown-film equipment and were analyzed in terms of transport to oxygen and water vapor, mechanical properties and overall migration...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28515575/controls-of-primary-production-in-two-phytoplankton-blooms-in-the-antarctic-circumpolar-current
#16
C J M Hoppe, C Klaas, S Ossebaar, M A Soppa, W Cheah, L M Laglera, J Santos-Echeandia, B Rost, D A Wolf-Gladrow, A Bracher, M Hoppema, V Strass, S Trimborn
The Antarctic Circumpolar Current has a high potential for primary production and carbon sequestration through the biological pump. In the current study, two large-scale blooms observed in 2012 during a cruise with R.V. Polarstern were investigated with respect to phytoplankton standing stocks, primary productivity and nutrient budgets. While net primary productivity was similar in both blooms, chlorophyll a -specific photosynthesis was more efficient in the bloom closer to the island of South Georgia (39 °W, 50 °S) compared to the open ocean bloom further east (12 °W, 51 °S)...
April 2017: Deep-sea Research. Part II, Topical Studies in Oceanography
https://www.readbyqxmd.com/read/28512570/the-structure-of-denisovite-a-fibrous-nanocrystalline-polytypic-disordered-very-complex-silicate-studied-by-a-synergistic-multi-disciplinary-approach-employing-methods-of-electron-crystallography-and-x-ray-powder-diffraction
#17
Ira V Rozhdestvenskaya, Enrico Mugnaioli, Marco Schowalter, Martin U Schmidt, Michael Czank, Wulf Depmeier, Andreas Rosenauer
Denisovite is a rare mineral occurring as aggregates of fibres typically 200-500 nm diameter. It was confirmed as a new mineral in 1984, but important facts about its chemical formula, lattice parameters, symmetry and structure have remained incompletely known since then. Recently obtained results from studies using microprobe analysis, X-ray powder diffraction (XRPD), electron crystallography, modelling and Rietveld refinement will be reported. The electron crystallography methods include transmission electron microscopy (TEM), selected-area electron diffraction (SAED), high-angle annular dark-field imaging (HAADF), high-resolution transmission electron microscopy (HRTEM), precession electron diffraction (PED) and electron diffraction tomography (EDT)...
May 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/28512485/effect-of-blood-exposure-on-push-out-bond-strength-of-four-calcium-silicate-based-cements
#18
Kazem Ashofteh Yazdi, Behnam Bolhari, Tohid Sabetmoghaddam, Naghmeh Meraji, Mohammad Javad Kharazifard
INTRODUCTION: The purpose of this study was to compare the push-out bond strength of white ProRoot Mineral Trioxide Aggregate (MTA), Biodentine, calcium-enriched mixture (CEM) cement and Endosequence Root Repair Material (ERRM) putty after exposure to blood. METHODS AND MATERIALS: A total of 96 root dentin slices with a standardized thickness of 1.00±0.05 mm and standardized canal spaces were randomly divided into 4 main experimental groups (n=24) according to the calcium silicate based cement (CSC) used: white ProRoot MTA, CEM Cement, ERRM Putty and Biodentine...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28506870/development-of-solid-sedds-vii-effect-of-pore-size-of-silica-on-drug-release-from-adsorbed-self-emulsifying-lipid-based-formulations
#19
Suhas G Gumaste, Abu T M Serajuddin
PURPOSE: Lipid-based self-emulsifying drug delivery systems (SEDDS) are usually liquids, and they can be converted into solid dosage forms by adsorbing onto silicates. However, most commercially available silicates are mesoporous with small pore sizes of 1 to 50nm that lead to incomplete emulsification of SEDDS inside the pores and thus incomplete drug release. The objective of this study was to investigate the impact of silica pore size on the extent of drug release from SEDDS solidified by adsorbing onto macroporous silicas with different pore sizes...
May 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28505810/effect-of-composition-and-pressure-on-the-shear-strength-of-sodium-silicate-glasses-an-atomic-scale-simulation-study
#20
Gergely Molnár, Patrick Ganster, Anne Tanguy
The elastoplastic behavior of sodium silicate glasses is studied at different scales as a function of composition and pressure, with the help of quasistatic atomistic simulations. The samples are first compressed and then sheared at constant pressure to calculate yield strength and permanent plastic deformations. Changes occurring in the global response are then compared to the analysis of local plastic rearrangements and strain heterogeneities. It is shown that the plastic response results from the succession of well-identified localized irreversible deformations occurring in a nanometer-size area...
April 2017: Physical Review. E
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