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https://www.readbyqxmd.com/read/28088144/more-room-for-microphase-separation-an-extended-study-on-binary-liquids-confined-in-sba-15-cylindrical-pores
#1
Ramona Mhanna, Abdel Razzak Abdel Hamid, Sujeet Dutta, Ronan Lefort, Laurence Noirez, Bernhard Frick, Denis Morineau
The confinement of liquid mixtures in porous channels provides new insight into fluid ordering at the nanoscale. In this study, we address a phenomenon of microphase separation, which appears as a novel fascinating confinement effect for fully miscible binary liquids. We investigate the structure of tert-butanol-toluene mixtures confined in the straight and mono-dispersed cylindrical nanochannels of SBA-15 mesoporous silicates (D = 8.3 nm). Small angle neutron scattering experiments on samples with carefully designed isotopic compositions are performed to systematically vary the scattering length density of the different compounds and assess the radial concentration profile of the confined phases...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28078370/evaluation-of-groundwater-quality-in-the-eastern-district-of-abu-dhabi-emirate-uae
#2
Mohamed M Mohamed, Ahmed Murad, RezaulKabir Chowdhury
Water samples were collected to evaluate the groundwater quality in the shallow unconfined alluvial aquifer in the eastern part of Abu-Dhabi Emirate, UAE. The chemical monitoring revealed some spatial variability in chemical parameters as influenced by matrix aquifer changes in geological formations. Results show that changes in groundwater chemistry in the aquifer is mainly controlled by evaporation, silicate mineral dissolution, evaporite dissolution, and cation exchange. The concentration increases were accounted for primarily by dissolved sodium, chloride, and sulphate...
January 11, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28077760/effective-delivery-of-volatile-biocides-employing-mesoporous-silicates-for-treating-biofilms
#3
Andrea C Chan, Marimar Bravo Cadena, Helen E Townley, Mark D Fricker, Ian P Thompson
Nanoparticulate delivery of biocides has the potential to decrease levels of exposure to non-target organisms, and miminize long-term exposure that can promote the development of resistance. Silica nanoparticles are an ideal vehicle since they are inert, biocompatible, biodegradable, and thermally and chemically stable. Encapsulation of biocides within nanoparticulates can improve their stability and longevity and maximize the biocidal potential of hydrophobic volatile compounds. Herein, we have shown that the plant secondary metabolites allyl isothiocyanate and cinnamaldehyde demonstrated increased antimicrobial activity against Escherichia coli in planktonic form, when packaged into mesoporous silica nanoparticles...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28074912/influences-of-calcium-silicate-on-chemical-forms-and-subcellular-distribution-of-cadmium-in-amaranthus-hypochondriacus-l
#4
Huanping Lu, Zhian Li, Jingtao Wu, Yong Shen, Yingwen Li, Bi Zou, Yetao Tang, Ping Zhuang
A pot experiment was conducted to investigate the effects of calcium silicate (CS) on the subcellular distribution and chemical forms of cadmium (Cd) in grain amaranths (Amaranthus hypochondriacus L. Cv. 'K112') grown in a Cd contaminated soil. Results showed that the dry weight and the photosynthetic pigments contents in grain amaranths increased significantly with the increasing doses of CS treatments, with the highest value found for the treatment of CS3 (1.65 g/kg). Compared with the control, application of CS4 (3...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28073075/freeform-extrusion-fabrication-of-titanium-fiber-reinforced-13-93-bioactive-glass-scaffolds
#5
Albin Thomas, Krishna C R Kolan, Ming C Leu, Gregory E Hilmas
Although implants made with bioactive glass have shown promising results for bone repair, their application in repairing load-bearing long bone is limited due to their poor mechanical properties in comparison to human bone. This work investigates the freeform extrusion fabrication of bioactive silicate 13-93 glass scaffolds reinforced with titanium (Ti) fibers. A composite paste prepared with 13-93 glass and Ti fibers (~16µm in diameter and lengths varying from ~200µm to ~2 mm) was extruded through a nozzle to fabricate scaffolds (0-90° filament orientation pattern) on a heated plate...
December 31, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28069245/extended-glaze-firing-on-ceramics-for-hard-machining-crack-healing-residual-stresses-optical-and-microstructural-aspects
#6
Iana L Aurélio, Lucio S Dorneles, Liliana G May
OBJECTIVE: To evaluate the effect of extended and conventional (manufacturer-recommended) glaze firings on crack healing, residual stresses, optical characteristics and crystalline structure of four ceramics for hard machining. METHODS: Rectangular specimens were obtained by sectioning densely sintered feldspathic (FEL), leucite- (LEU), lithium disilicate- (DIS), and zirconia-reinforced lithium silicate-based (ZLS) prefabricated ceramic blocks and divided into groups according to the applied glaze firing (n=5): conventional glaze/manufacturer-recommended (G), extended glaze (EG) and control/no heat treatment (C)...
January 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28064420/iron-incorporation-in-biosilica-of-the-marine-diatom-stephanopyxis%C3%A2-turris-dispersed-or-clustered
#7
Janine Kaden, Stephan I Brückner, Susanne Machill, Christoph Krafft, Andreas Pöppl, Eike Brunner
Iron incorporation into diatom biosilica was investigated for the species Stephanopyxis turris. It is known that several "foreign" elements (e.g., germanium, titanium, aluminum, zinc, iron) can be incorporated into the siliceous cell walls of diatoms in addition to silicon dioxide (SiO2). In order to examine the amount and form of iron incorporation, the iron content in the growth medium was varied during cultivation. Fe:Si ratios of isolated cell walls were measured by ICP-OES. SEM studies were performed to examine of a possible influence of excess iron during diatom growth upon cell wall formation...
January 7, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28063315/chemical-modeling-of-groundwater-in-the-banat-plain-southwestern-romania-with-elevated-as-content-and-co-occurring-species-by-combining-diagrams-and-unsupervised-multivariate-statistical-approaches
#8
Sinziana Butaciu, Marin Senila, Costel Sarbu, Michaela Ponta, Claudiu Tanaselia, Oana Cadar, Marius Roman, Emil Radu, Mihaela Sima, Tiberiu Frentiu
The study proposes a combined model based on diagrams (Gibbs, Piper, Stuyfzand Hydrogeochemical Classification System) and unsupervised statistical approaches (Cluster Analysis, Principal Component Analysis, Fuzzy Principal Component Analysis, Fuzzy Hierarchical Cross-Clustering) to describe natural enrichment of inorganic arsenic and co-occurring species in groundwater in the Banat Plain, southwestern Romania. Speciation of inorganic As (arsenite, arsenate), ion concentrations (Na(+), K(+), Ca(2+), Mg(2+), HCO3(-), Cl(-), F(-), SO4(2-), PO4(3-), NO3(-)), pH, redox potential, conductivity and total dissolved substances were performed...
December 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/28059788/silicic-acid-and-beer-consumption-reverses-the-metal-imbalance-and%C3%A2-the%C3%A2-prooxidant-status-induced-by%C3%A2-aluminum-nitrate-in-mouse-brain
#9
María José González-Muñoz, Alba Garcimartán, Isabel Meseguer, Carmen José Mateos-Vega, José María Orellana, Antonio Peña-Fernández, Juana Benedí, Francisco J Sánchez-Muniz
BACKGROUND: Emerging evidence suggests that by affecting mineral balance, aluminum (Al) may enhance some events associated with neurodegenerative diseases. AIM: To examine the effect of Al(NO3)3 exposure on brain Al, cooper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), silicon (Si), and zinc (Zn) levels, and the metal-change implication in brain oxidant and inflammatory status. METHODS: Four groups of six-week-old male NMRI mice were treated for three months: i) controls, administrated with deionized water; ii) Al, which received Al(NO3)3; iii) Al+silicic acid, which were given Al(NO3)3 plus silicic acid; and iv) Al+beer, which received Al(NO3)3 plus beer...
December 3, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28059327/coherent-supercontinuum-bandwidth-limitations-under-femtosecond-pumping-at-2-%C3%A2%C2%B5m-in-all-solid-soft-glass-photonic-crystal-fibers
#10
Mariusz Klimczak, Bartłomiej Siwicki, Binbin Zhou, Morten Bache, Dariusz Pysz, Ole Bang, Ryszard Buczyński
Two all-solid glass photonic crystal fibers with all-normal dispersion profiles are evaluated for coherent supercontinuum generation under pumping in the 2.0 μm range. In-house boron-silicate and commercial lead-silicate glasses were used to fabricate fibers optimized for either flat dispersion, albeit with lower nonlinearity, or with larger dispersion profile curvature but with much higher nonlinearity. Recorded spectra at the redshifted edge reached 2500-2800 nm depending on fiber type. Possible factors behind these differences are discussed with numerical simulations...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28057942/the-effect-of-liquid-composition-on-the-partitioning-of-ni-between-olivine-and-silicate-melt
#11
Andrew K Matzen, Michael B Baker, John R Beckett, Bernard J Wood, Edward M Stolper
We report the results of experiments designed to separate the effects of temperature and pressure from liquid composition on the partitioning of Ni between olivine and liquid, [Formula: see text]. Experiments were performed from 1300 to 1600 °C and 1 atm to 3.0 GPa, using mid-ocean ridge basalt (MORB) glass surrounded by powdered olivine in graphite-Pt double capsules at high pressure and powdered MORB in crucibles fabricated from single crystals of San Carlos olivine at one atmosphere. In these experiments, pressure and temperature were varied in such a way that we produced a series of liquids, each with an approximately constant composition (~12, ~15, and ~21 wt% MgO)...
2017: Contributions to Mineralogy and Petrology. Beiträge Zur Mineralogie und Petrologie
https://www.readbyqxmd.com/read/28056710/three-dimensional-printing-of-porous-load-bearing-bioceramic-scaffolds
#12
Elena Mancuso, Naif Alharbi, Oana A Bretcanu, Martyn Marshall, Mark A Birch, Andrew W McCaskie, Kenneth W Dalgarno
This article reports on the use of the binder jetting three-dimensional printing process combined with sintering to process bioceramic materials to form micro- and macroporous three-dimensional structures. Three different glass-ceramic formulations, apatite-wollastonite and two silicate-based glasses, have been processed using this route to create porous structures which have Young's modulus equivalent to cortical bone and average bending strengths in the range 24-36 MPa. It is demonstrated that a range of macroporous geometries can be created with accuracies of ±0...
December 1, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28045315/composition-and-microstructure-of-mta-and-aureoseal-plus-xrf-eds-xrd-and-fesem-evaluation
#13
L Cianconi, P Palopoli, V Campanella, M Mancini
AIM: The aim of this study was to determine the chemical composition and the phases' microstructure of Aureoseal Plus (OGNA, Italy) and ProRoot MTA (Dentsply Tulsa Dental, USA) and to compare their characteristics. MATERIALS AND METHODS: Study Design: Comparing Aureoseal Plus and ProRoot MTA microstructure by means of several analyses type. The chemical analysis of the two cements was assessed following the UNI EN ISO 196-2 norm. X-Ray fluorescence (XRF) was used to determine the element composition...
December 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28044170/sub-micron-pore-size-tailoring-for-efficient-chiral-discrimination
#14
Markus M Herling, Ulrike Lacher, Martin Rieß, Sebastian Seibt, Mathias Schwedes, Hussein Kalo, Rainer Schobert, Josef Breu
Adsorption studies in microporous organically pillared layered silicates (MOPS) show that precise control of micropore size in the sub-Ångström range is crucial for chiral discrimination. The highly modular character of MOPS generally allows for an optimization of guest recognition without the need to explore different framework topologies.
January 3, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28043751/bone-incorporation-of-silicate-substituted-calcium-phosphate-in-2-stage-revision-anterior-cruciate-ligament-reconstruction-a-histologic-and-radiographic-study
#15
Jan von Recum, Johannes Schwaab, Thorsten Guehring, Paul-Alfred Grützner, Marc Schnetzke
PURPOSE: To evaluate the histologic and radiographic outcomes of using silicate-substituted calcium phosphate (Si-CaP) as bone graft substitute for the augmentation of tunnel defects in 2-stage revision anterior cruciate ligament (ACL) reconstruction. METHODS: Forty patients undergoing 2-stage revision ACL reconstruction were included in a prospective, randomized controlled clinical trial between 2012 and 2015. The inclusion criteria were tunnel diameter of the tibial and/or femoral tunnel of 10 mm or greater after failed ACL reconstruction...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28028243/transparent-amorphous-oxide-semiconductors-for-organic-electronics-application-to-inverted-oleds
#16
Hideo Hosono, Junghwan Kim, Yoshitake Toda, Toshio Kamiya, Satoru Watanabe
Efficient electron transfer between a cathode and an active organic layer is one key to realizing high-performance organic devices, which require electron injection/transport materials with very low work functions. We developed two wide-bandgap amorphous (a-) oxide semiconductors, a-calcium aluminate electride (a-C12A7:e) and a-zinc silicate (a-ZSO). A-ZSO exhibits a low work function of 3.5 eV and high electron mobility of 1 cm(2)/(V · s); furthermore, it also forms an ohmic contact with not only conventional cathode materials but also anode materials...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28024643/facile-and-innovative-method-for-bioglass-surface-modification-optimization-studies
#17
João Henrique Lopes, Emanuella Maria Barreto Fonseca, Italo O Mazali, Alviclér Magalhães, Richard Landers, Celso Aparecido Bertran
In this work it is presented a facile and novel method for modification of bioglass surface based on (Camolten salt bath(2+)|Naglass(+)) ion exchange by immersion in molten salt bath. This method allows changing selectively the chemical composition of a surface layer of glass, creating a new and more reactive bioglass in a shell that surrounds the unchanged bulk of the original BG45S5 bioglass (core-shell type system). The modified bioglass conserves the non-crystalline structure of BG45S5 bioglass and presents a significant increase of surface reactivity in comparison with BG45S5...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024623/role-of-magnesium-oxide-and-strontium-oxide-as-modifiers-in-silicate-based-bioactive-glasses-effects-on-thermal-behaviour-mechanical-properties-and-in-vitro-bioactivity
#18
Devis Bellucci, Antonella Sola, Roberta Salvatori, Alexandre Anesi, Luigi Chiarini, Valeria Cannillo
The composition of a CaO-rich silicate bioglass (BG_Ca-Mix, in mol%: 2.3 Na2O; 2.3 K2O; 45.6 CaO; 2.6 P2O5; 47.2 SiO2) was modified by replacing a fixed 10mol% of CaO with MgO or SrO or fifty-fifty MgO-SrO. The thermal behaviour of the modified glasses was accurately evaluated via differential thermal analysis (DTA), heating microscopy and direct sintering tests. The presence of MgO and/or SrO didn't interfere with the thermal stability of the parent glass, since all the new glasses remained completely amorphous after sintering (treatment performed at 753°C for the glass with MgO; at 750°C with SrO; at 759°C with MgO and SrO)...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024584/a-comparative-study-on-the-synthesis-mechanism-bioactivity-and-mechanical-properties-of-three-silicate-bioceramics
#19
Aliakbar Najafinezhad, Majid Abdellahi, Hamid Ghayour, Ali Soheily, Akbar Chami, Amirsalar Khandan
In the present study three akermanite (Ca2MgSi2O7), diopside (CaMgSi2O6) and baghdadite (Ca3ZrSi2O9) applicable bioceramics were synthesized via a sol-gel based method. The combination of sol-gel method and the raw materials used in this study presents a new route for the synthesis of the mentioned bioceramics. By the use of thermal analysis, the mechanisms occurred during the synthesis of these bioceramics were investigated. The differences in the structural density and their relation with the degradation rate and mechanical properties of all three ceramics were studied...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024578/a-novel-tantalum-containing-bioglass-part-i-structure-and-solubility
#20
Adel Mf Alhalawani, Mark R Towler
Bioglasses are employed for surgical augmentation in a range of hard tissue applications. Tantalum is a bioactive and biocompatible transition metal that has been used as an orthopedic medical device. It has a range of biological and physical properties that make its incorporation into ionic form into bioactive glass systems promising for various clinical applications. The work herein reports the characterization and properties of novel tantalum-containing glasses. A series of glasses based on the system 48SiO2-(36-X)ZnO-6CaO-8SrO-2P2O5-XTa2O5 with X varying from 0mol% (TA0) to 0...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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