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https://www.readbyqxmd.com/read/29454246/screening-of-physicochemical-treatment-processes-for-reducing-toxicity-of-hair-care-products-wastewaters
#1
Elisa Dias de Melo, Ann Mounteer, Eduarda Reis, Ellen Costa, Alana Vilete
Toxicity reduction in wastewaters from small hair care products manufacturing companies using coagulation/flocculation/sedimentation or flotation, membrane separation and powdered activated charcoal adsorption was evaluated. Raw wastewater composition varied widely within and especially between companies, but all exhibited high acute toxicity to Daphnia similis (EC(I)50; 48 h < 0.02-0.33%). Coagulation with aluminum sulfate and polyaluminum chloride aided by cationic or anionic polymers, as well as filtration on ultra (UF) and nanofiltration (NF) membranes efficiently removed turbidity (>99%) and oil and grease (>99%) and all treated samples exhibited similar dissolved organic matter contents...
February 14, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29453496/influence-of-surface-treatment-on-the-performance-of-silorane-based-composite-resin-in-class-i-restorations-a-randomized-clinical-trial
#2
Isabella Pereira Marques, Fabíola Belkiss Santos de Oliveira, João Gabriel Silva Souza, Raquel Conceição Ferreira, Claudia Silami Magalhães, Fabiana Mantovani Gomes França, Daniela Araújo Veloso Popoff
OBJECTIVES: The aim of this study was to evaluate the clinical performance of silorane-based composite restorations applied after different surface treatments. MATERIALS AND METHODS: This controlled and randomized clinical trial included 26 patients with class I restoration indications. The teeth were randomly assigned to the following treatments: control 1/G1, silorane specific self-etching adhesive (P90 self-etch primer and bond) + silorane-based composite resin (Filtek™ P90 low shrink posterior restorative); G2, 37% phosphoric acid + silorane specific self-etching adhesive + silorane-based composite resin; G3, blasting with aluminum oxide + silorane specific self-etching adhesive + silorane-based composite resin; and control 2/G4, self-etching adhesive (Adper™ SE Plus self-etch adhesive) + dimethacrylate-based composite resin (Filtek™ P60 posterior restorative)...
February 16, 2018: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29453080/improvement-of-the-radiographic-method-for-measurement-of-effective-energy-of-pulsed-x-ray-emission-from-a-pf-device-for-different-anode-s-insert-materials
#3
Seyed Milad Miremad, Babak Shirani
In this paper, effective energy of pulsed X-Ray emitted from a Mather-type plasma focus device in stored energy of 2.5 kJ with six different anode's insert materials was measured using radiographic method with attenuation filters. Since intensity and energy of X-ray beam were considerably changed with changing the insert material, the method was improved by using different filters simultaneously in all the experiments and selection of the best filter in each experiment according to the appropriate criteria...
February 9, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29453073/stabilization-of-lead-pb-and-zinc-zn-in-contaminated-rice-paddy-soil-using-starfish-a-preliminary-study
#4
Deok Hyun Moon, Inseong Hwang, Agamemnon Koutsospyros, Kyung Hoon Cheong, Yong Sik Ok, Won Hyun Ji, Jeong-Hun Park
Lead (Pb) and zinc (Zn) contaminated rice paddy soil was stabilized using natural (NSF) and calcined starfish (CSF). Contaminated soil was treated with NSF in the range of 0-10 wt% and CSF in the range of 0-5 wt% and cured for 28 days. Toxicity characteristic leaching procedure (TCLP) test was used to evaluate effectiveness of starfish treatment. Scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) analyses were conducted to investigate the mechanism responsible for effective immobilization of Pb and Zn...
February 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29451336/electronically-unsaturated-three-coordinated-aluminum-hydride-and-organoaluminum-cations
#5
Billa Prashanth, Mamta Bhandari, Satyam Ravi, K R Shamasundar, Sanjay Singh
New three coordinated and electronically unsaturated aluminum hydride [LAlH]+[HB(C6F5)3]- and aluminum methyl [LAlMe]+[MeB(C6F5)3]- cations have been prepared. The quantitative estimation of Lewis acidity by Gutmann-Beckett method reveals [LAlH]+[HB(C6F5)3]- to be better Lewis acid than B(C6F5)3 and AlCl3 making these compounds ideal catalysts for Lewis acid mediated reactions. To highlight that the work is of fundamental importance, catalytic hydroboration of aliphatic and aromatic aldehydes and ketones have been demonstrated...
February 16, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29450772/dissolved-organic-matter-distribution-and-its-association-with-colloidal-aluminum-and-iron-in-the-selenga-river-basin-from-ulaanbaatar-to-lake-baikal
#6
Morimaru Kida, Orgilbold Myangan, Bolormaa Oyuntsetseg, Viacheslav Khakhinov, Masayuki Kawahigashi, Nobuhide Fujitake
The Selenga River Basin (Mongolia and Russia) has suffered from heavy metal contamination by placer gold mining and urban activities in recent decades. The objectives of this study were to provide the first distribution data of dissolved organic matter (DOM) and humic substances (HS) in this data-scarce region, and to investigate their association with dissolved and colloidal metals. Two sampling campaigns were conducted in August of 2013 and 2014. A constant proportion of HS (%HS; coefficient of variation of 2%) was observed from the headwater of Tuul River to the end of the delta before Lake Baikal, spanning > 1000 km in distance...
February 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29449906/elucidating-the-vibrational-fingerprint-of-the-flexible-metal-organic-framework-mil-53-al-using-a-combined-experimental-computational-approach
#7
Alexander E J Hoffman, Louis Vanduyfhuys, Irena Nevjestić, Jelle Wieme, Sven M J Rogge, Hannes Depauw, Pascal Van Der Voort, Henk Vrielinck, Veronique Van Speybroeck
In this work, mid-infrared (mid-IR), far-IR, and Raman spectra are presented for the distinct (meta)stable phases of the flexible metal-organic framework MIL-53(Al). Static density functional theory (DFT) simulations are performed, allowing for the identification of all IR-active modes, which is unprecedented in the low-frequency region. A unique vibrational fingerprint is revealed, resulting from aluminum-oxide backbone stretching modes, which can be used to clearly distinguish the IR spectra of the closed- and large-pore phases...
February 8, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29449637/facile-emulsion-mediated-synthesis-of-phase-pure-diopside-nanoparticles
#8
Elena Tajuelo Rodriguez, Lawrence M Anovitz, Caleb D Clement, Adam J Rondinone, Michael C Cheshire
Diopside is a common natural pyroxene that is rarely found in a pure state, since magnesium is often partially substituted by iron, and other elements (sodium and aluminum) are often present. This pyroxene, along with feldspars and olivines, is common in concrete. As the prospective license renewal of light water reactors to 80 years of operation has raised concerns on the effects of radiation in the concrete biological shield surrounding the reactors, mineral nanoparticles can be valuable to perform amorphization studies to inform predictive models of mechanical properties of irradiated concrete...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29448746/nano-precipitation-and-hardening-of-die-quenched-6061-aluminum-alloy
#9
Hiroshi Utsunomiya, Koki Tada, Ryo Matsumoto, Katsumi Watanabe, Kenji Matsuda
Die quenching is applied to an age-hardenable aluminium alloys to obtain super-saturated solid solution. The application is advantageous because it can reduce number of manufacturing processes, and may increase strength by strain aging. If die quenching is realized in forging as well as sheet forming, it may widen industrial applicability further. In this study, Al-Mg-Si alloy AA6061 8 mm-thick billets were reduced 50% in height without cracks by die-quench forging. Supersaturated solid solution was successfully obtained...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448713/study-on-microstructure-and-mechanical-properties-of-al-li-based-alloys-processed-by-extrusion
#10
Yong-Ho Kim, Hyo-Sang Yoo, Chang-Gi Jung, Hyeon-Taek Son
Aluminum and its alloys, due to their low density, high specific strength and high corrosion resistance amongst various structural materials, are used in a wide range of industrial applications for different aqueous solutions. In the present study, we studied effects of Ce addition on microstructure and mechanical properties of Al-2Li-1Cu-0.8Mg-0.1Zr alloys. The melt was held at 780 °C for 20 min and poured into a mold. And as-cast Al alloys were hot-extruded into a plate that was 4 mm in thickness with a reduction ratio of 14:1...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448691/grain-refinement-of-al-si-fe-cu-zn-mn-based-alloy-by-al-ti-b-alloy-and-its-effect-on-mechanical-properties
#11
Hyo-Sang Yoo, Yong-Ho Kim, Chang-Gi Jung, Sang-Chan Lee, Seong-Hee Lee, Hyeon-Taek Son
We investigated the effects of Al-5.0wt%Ti-1.0wt%B addition on the microstructure and mechanical properties of the as-extruded Al-0.15wt%Si-0.2wt%Fe-0.3wt%Cu-0.15wt%Zn-0.9wt%Mn based alloys. The Aluminum alloy melt was held at 800 °C and then poured into a mould at 200 °C. Aluminum alloys were hot-extruded into a rod that was 12 mm in thickness with a reduction ratio of 38:1. AlTiB addition to Al-0.15Si-0.2Fe-0.3Cu-0.15Zn-0.9Mn based alloys resulted in the formation of Al3Ti and TiB2 intermetallic compounds and grain refinement...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448690/characteristics-of-nano-grained-aa1050-aa5052-al-sheets-fabricated-by-accumulative-roll-bonding
#12
Seong-Hee Lee, Jung-Han Kim, Hyo-Sang Yoo, Hyeon-Taek Son
Accumulative roll-bonding (ARB) is the most appropriate process for sheet-shaped materials because it can be carried out readily by utilizing the conventional rolling apparatus. In this study, a nanostructured AA1050/AA5052 Al alloy sheet was successfully fabricated by four-layer stack ARB process. The ARB of AA1050 and AA5052 alloy sheets was performed up to 6 cycles without a lubricant at ambient temperature. The sample fabricated by the ARB was a multi-layer aluminum alloy sheet in which AA1050 and AA5052 layers are alternately stacked...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448670/effects-of-heat-treatment-on-interfacial-behavior-and-bonding-strength-of-surface-activated-bonding-ti-al-laminate
#13
Chang-Been Lee, Seong-Sik Bang, Young-Chul Park, Jee Hun Kim, Nam-Seok Kim, Seung-Ho Yang, Jae-Sung Park, Jong-Bae Kim, Dong-Ho Choi, Soonwan Chung, Changjae Kim, Taek-Kyun Jung, Soong-Keun Hyun
The surface activated bonding (SAB) method generally has the advantage of high bonding strength, low contact resistance, and high microstructural stability at room temperature. In this study, Ti-Al laminates were produced by surface activated bonding with aluminum and titanium foils. Heat treatment was conducted at the temperature range from 200 to 550 °C in vacuum. The bonding strength Ti-Al laminates was measured by a peel test, and the interfacial characteristics were investigated microstructural observation...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448596/enhanced-power-factor-and-increased-conductivity-of-aluminum-doped-zinc-oxide-thin-films-for-thermoelectric-applications
#14
John Kennedy, Peter P Murmu, Jérôme Leveneur, V M Williams, Ryan L Moody, Tanmay Maity, Shen V Chong
We report the structural, electrical and thermopower properties of un-doped and Al doped zinc oxide (ZnO) thin films. Al doping was carried out using 25 keV Al+ implantation with 0.1, 1 and 2% Al into ZnO. X-ray diffraction measurements showed that the lattice parameters were larger than the bulk values, which is consistent with the incorporation of Al atoms at interstitials. Al doping increased the electrical conductivity from 100 (Ωcm)-1 in the un-doped ZnO film to 598 (Ωcm)-1 in the 2% Al doped ZnO film...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448182/enhanced-alumina-recovery-from-secondary-aluminum-dross-for-high-purity-nanostructured-%C3%AE-alumina-powder-production-kinetic-study
#15
Mostafa Mahinroosta, Ali Allahverdi
The numerous ecological problems caused by the accumulation of secondary aluminum dross (SAD) as a hazardous waste generated in aluminum castings have necessitated a need for a sustainable recycling solution. This study proposes a novel and green leaching-based process for recovery of nano-alumina as a highly valuable material from SAD. The leaching phase was performed at atmospheric pressure and low temperature. To obtain optimum conditions for the recovery process, the dissolution kinetics and mechanism of SAD in hydrochloric acid were initially studied under a given liquid-to-solid ratio of 20 ml/g, various reaction temperatures and times...
February 12, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29445953/competition-between-abiogenic-al-3-and-native-mg-2-fe-2-and-zn-2-ions-in-protein-binding-sites-implications-for-aluminum-toxicity
#16
Todor Dudev, Diana Cheshmedzhieva, Lyudmila Doudeva
Abiogenic aluminum has been implicated in some health disorders in humans. Protein binding sites containing essential metals (mostly magnesium) have been detected as targets for the "alien" Al 3+ . However, the acute toxicity of aluminum is very low. Although a substantial body of information has been accumulated on the biochemistry of aluminum, the underlying mechanisms of its toxicity are still not fully understood. Several outstanding questions remain unanswered: (1) Why is the toxicity of aluminum, unlike that of other "alien" metal cations, relatively low? (2) Apart from Mg 2+ active centers in proteins, how vulnerable are other essential metal binding sites to Al 3+ attack? (3) Generally, what factors do govern the competition between 'alien" Al 3+ and cognate divalent metal cations in metalloproteins under physiologically relevant conditions? Here, we endeavor to answer these questions by studying the thermodynamic outcome of the competition between Al 3+ and a series of biogenic metal cations, such as Mg 2+ , Fe 2+ and Zn 2+ , in model protein binding sites of various structures, compositions, solvent exposure and charge states...
February 14, 2018: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/29443912/influence-of-scanning-strategies-on-processing-of-aluminum-alloy-en-aw-2618-using-selective-laser-melting
#17
Daniel Koutny, David Palousek, Libor Pantelejev, Christian Hoeller, Rudolf Pichler, Lukas Tesicky, Jozef Kaiser
This paper deals with various selective laser melting (SLM) processing strategies for aluminum 2618 powder in order to get material densities and properties close to conventionally-produced, high-strength 2618 alloy. To evaluate the influence of laser scanning strategies on the resulting porosity and mechanical properties a row of experiments was done. Three types of samples were used: single-track welds, bulk samples and samples for tensile testing. Single-track welds were used to find the appropriate processing parameters for achieving continuous and well-shaped welds...
February 14, 2018: Materials
https://www.readbyqxmd.com/read/29443428/organocatalytic-c-f-bond-activation-with-alanes
#18
Alma Dorothea Jaeger, Christian Ehm, Dieter Lentz
Hydrodefluorination reactions (HDF) of per- and polyfluorinated olefins and arenes by cheap aluminum alkyl hydrides in non-coordinating solvents can be catalyzed by O and N donors. TONs with respect to the organocatalysts of up to 87 have been observed. Depending on substrate and concentration, high selectivities can be achieved. For the prototypical hexafluoropropene, however, low selectivities are observed (E/Z ~ 2). DFT studies show that the preferred HDF mechanism for this substrate in the presence of donor solvents proceeds from the dimer Me4Al2(μ-H)2·THF via nucleophilic vinylic substitution (SNV) like transition states with low selectivity and without formation of an intermediate, not via hydrometallation or σ-bond metathesis...
February 14, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29443078/chemo-enzymatic-synthesis-of-n-glycans-for-array-development-and-hiv-antibody-profiling
#19
Sachin S Shivatare, Vidya S Shivatare, Chung-Yi Wu, Chi-Huey Wong
We present a highly efficient way for the rapid preparation of a wide range of N-linked oligosaccharides (estimated to exceed 20,000 structures) that are commonly found on human glycoproteins. To achieve the desired structural diversity, the strategy began with the chemo-enzymatic synthesis of three kinds of oligosaccharyl fluoride modules, followed by their stepwise α-selective glycosylations at the 3-O and 6-O positions of the mannose residue of the common core trisaccharide having a crucial β-mannoside linkage...
February 5, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29442953/fabrication-and-evaluation-of-aluminum-laminated-film-for-a-pouch-type-secondary-battery
#20
Jung Min Cho, Do Hyun Kim, Min Sook Yoo, Sungwoo Bae, Dong Soo Kim
In this study, we intend to find the laminate condition for improvement of the chemical resistance of the aluminum pouch film widely used as the coating material of the secondary battery. Here, we investigated the properties including the initial adhesive strength and electrolyte resistance between the metal film layer aluminum and the sealant layer cast polypropylene (CPP) film. As for the laminating condition, we changed the temperature and line speed and maintained the identical pressure conditions. A roll-to-roll dry laminate coating system was used in surface treatment agent coating, adhesive coating, and film laminate...
April 1, 2018: Journal of Nanoscience and Nanotechnology
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