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https://www.readbyqxmd.com/read/28437645/facile-modification-of-nanoscale-zero-valent-iron-with-high-stability-for-cr-vi-remediation
#1
Ziling Peng, Chunmei Xiong, Wei Wang, Fatang Tan, Yang Xu, Xinyun Wang, Xueliang Qiao
In this study, a highly stable nanoscale zero-valent iron composite (HS-NZVI) was obtained via modifying nanoscale zero-valent iron (NZVI) with tetraethyl orthosilicate (TEOS) and hexadecyltrimethoxysilane (HDTMOS), and used for Cr(VI) remediation in aqueous solution. The obtained HS-NZVI remained stable in water without being oxidized for over 12h. After four consecutive runs, the Cr(VI) removal efficiency of HS-NZVI maintained a value of more than 82%. Moreover, the Cr(VI) removal capacity per unit weight of NZVI in HS-NZVI reached 292...
April 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28437101/ground-state-and-excited-state-tuning-in-ferric-dipyrrin-complexes-promoted-by-ancillary-ligand-exchange
#2
Claudia Kleinlein, Shao-Liang Zheng, Theodore A Betley
Three ferric dipyrromethene complexes featuring different ancillary ligands were synthesized by one electron oxidation of ferrous precursors. Four-coordinate iron complexes of the type ((Ar)L)FeX2 [(Ar)L = 1,9-(2,4,6-Ph3C6H2)2-5-mesityldipyrromethene] with X = Cl or (t)BuO were prepared and found to be high-spin (S = (5)/2), as determined by superconducting quantum interference device magnetometry, electron paramagnetic resonance, and (57)Fe Mössbauer spectroscopy. The ancillary ligand substitution was found to affect both ground state and excited properties of the ferric complexes examined...
April 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28437070/large-scale-synthesis-of-carbon-shell-coated-fep-nanoparticles-for-robust-hydrogen-evolution-reaction-electrocatalyst
#3
Dong Young Chung, Samuel Woojoo Jun, Gabin Yoon, Hyunjoong Kim, Ji Mun Yoo, Kug-Seung Lee, Taehyun Kim, Heejong Shin, Arun Kumar Sinha, Soon Gu Kwon, Kisuk Kang, Taeghwan Hyeon, Yung-Eun Sung
Highly active and stable non-Pt electrocatalyst for hydrogen production has been pursed for a long time as alternative of expensive Pt catalyst. Herein we report a simple and effective approach to prepare highly stable iron phosphide (FeP) nanoparticle electrocatalyst using iron oxide nanoparticles as the precursor. A single step heating procedure of polydopamine-coated iron oxide nanoparticles leads to carbonization of dopamine coating to carbon shell and phosphidation of iron oxide to FeP, simultaneously...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28436321/screening-of-bioactive-compounds-of-medicinal-mushrooms-collected-on-tunisian-territory
#4
Ayda Khadhri, Chedia Aouadhi, Samira Aschi-Smiti
This study is, to our knowledge, the first to investigate the pharmacological importance of wild Tunisian mushrooms. Ethanolic extracts of 5 Tunisian mushrooms-Phellinus torulosus, Fomes fomentarius, Trametes versicolor, Pisolithus albus, and Fomitopsis pinicola-were collected from the Kroumirie Region (North Tunisia). The dry basidomes of mushrooms were extracted using ethanol and evaluated for total polyphenol, flavonoid, flavonol, tannin, proanthocyanidin, and anthocyanin content. In addition, their antioxidant activities were determined using 3 assays (testing 2,2-diphenyl-1-picrylhydrazyl [DPPH] radical scavenging, the reducing power of iron, and the iron-chelating power)...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28435776/-self-peel-off-transfer-produces-ultrathin-polyvinylidene-fluoride-based-flexible-nanodevices
#5
Yanlong Tai, Gilles Lubineau
Here, a new strategy, self-peel-off transfer, for the preparation of ultrathin flexible nanodevices made from polyvinylidene-fluoride (PVDF) is reported. In this process, a functional pattern of nanoparticles is transferred via peeling from a temporary substrate to the final PVDF film. This peeling process takes advantage of the differences in the work of adhesion between the various layers (the PVDF layer, the nanoparticle-pattern layer and the substrate layer) and of the high stresses generated by the differential thermal expansion of the layers...
April 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28430292/failure-of-the-vascular-hypothesis-of-multiple-sclerosis-in-a-rat-model-of-chronic-cerebrospinal-venous-insufficiency
#6
Maha M A Zakaria, Shahira Y Mikhael, Azza K Abu Hussein, Rania A Salah El-Din, Hany W Abd El-Malak, Iman H Hewedi, Hany S Nadim
<i>Chronic cerebrospinal venous insufficiency (CCSVI) is a series of stenotic malformations in the cerebrospinal venous outflow routes, which is postulated to cause multiple sclerosis (MS). The hypotheses assumed that CCSVI leads to iron deposition which triggers inflammation and demyelination in MS. Invasive endovascular treatment of CCSVI was initiated based on the previous theory. The present study was designed to validate this hypothesis using a rat model of CCSVI. Bilateral jugular vein ligation (JVL) was performed on female albino rats (n = 15), and sham-operated rats (n = 15) were used as a control group...
2017: Folia Neuropathologica
https://www.readbyqxmd.com/read/28428976/sem-and-afm-studies-of-two-phase-magnetic-alkali-borosilicate-glasses
#7
N Andreeva, M Tomkovich, A Naberezhnov, B Nacke, A Filimonov, O Alekseeva, P Vanina, V Nizhankovskii
The morphology and composition of four types of two-phase alkali borosilicate glasses with magnetic atoms prepared by inductive melting have been studied. The results of scanning electron microscopy point to uniform distribution of Na, Si, and O atoms in these samples while magnetic iron atoms form ball-shaped agglomerates. The magnetic properties of these agglomerates have been confirmed by magnetic force microscopy. Atomic force microscopy had shown that in these samples two different morphological structures, drop-like and dendrite net, are formed...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28426089/ferrogels-based-on-entrapped-metallic-iron-nanoparticles-in-a-polyacrylamide-network-extended-derjaguin-landau-verwey-overbeek-consideration-interfacial-interactions-and-magnetodeformation
#8
Ajay Shankar, Alexander P Safronov, Ekaterina A Mikhnevich, Igor V Beketov, Galina V Kurlyandskaya
A new kind of ferrogel with entrapped metallic iron nanoparticles causing unusual magnetodeformation is presented. Crosslinked polyacrylamide (PAAm) based ferrogels embedded with iron nanoparticles (MNPs) were synthesized by free radical polymerization in aqueous medium. Spherical iron MNPs with average diameter 66 nm were synthesized by the electrical explosion of wire and modified by interfacial adsorption of linear polyacrylamide (LPAAm). Extended Derjaguin-Landau-Verwey-Overbeek (xDLVO) calculations based on the superposing of van der Waals, electrostatic, steric, and magnetic contributions showed that polymeric encapsulation of nanoparticles by LPAAm is one of the most suitable pathways for preparing stable aqueous dispersions of iron nanoparticles...
April 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28424520/decarboxylative-alkenylation
#9
Jacob T Edwards, Rohan R Merchant, Kyle S McClymont, Kyle W Knouse, Tian Qin, Lara R Malins, Benjamin Vokits, Scott A Shaw, Deng-Hui Bao, Fu-Liang Wei, Ting Zhou, Martin D Eastgate, Phil S Baran
Olefin chemistry, through pericyclic reactions, polymerizations, oxidations, or reductions, has an essential role in the manipulation of organic matter. Despite its importance, olefin synthesis still relies largely on chemistry introduced more than three decades ago, with metathesis being the most recent addition. Here we describe a simple method of accessing olefins with any substitution pattern or geometry from one of the most ubiquitous and variegated building blocks of chemistry: alkyl carboxylic acids...
April 19, 2017: Nature
https://www.readbyqxmd.com/read/28423951/preparation-characterization-and-dynamical-mechanical-properties-of-dextran-coated-iron-oxide-nanoparticles-dionps
#10
Hatice Kaplan Can, Serap Kavlak, Shahed ParviziKhosroshahi, Ali Güner
Dextran-coated iron oxide nanoparticles (DIONPs) with appropriate surface chemistry exhibit many interesting properties that can be exploited in a variety of biomedical applications such as magnetic resonance imaging (MRI) contrast enhancement, tissue repair, hyperthermia, drug delivery and in cell separation. This paper reports the experimental detail for preparation, characterization and investigation of thermal and dynamical mechanical characteristics of the dextran-coated Fe3O4 magnetic nanoparticles. In our work, DIONPs were prepared in a 1:2 ratio of Fe(II) and Fe(III) salt in the HCl solution with NaOH at given temperature...
April 20, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28416857/compositional-variability-of-nutrients-and-phytochemicals-in-corn-after-processing
#11
P S Prasanthi, N Naveena, M Vishnuvardhana Rao, K Bhaskarachary
The result of various process strategies on the nutrient and phytochemical composition of corn samples were studied. Fresh and cooked baby corn, sweet corn, dent corn and industrially processed and cooked popcorn, corn grits, corn flour and corn flakes were analysed for the determination of proximate, minerals, xanthophylls and phenolic acids content. This study revealed that the proximate composition of popcorn is high compared to the other corn products analyzed while the mineral composition of these maize products showed higher concentration of magnesium, phosphorus, potassium and low concentration of calcium, manganese, zinc, iron, copper, and sodium...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28415550/high-impact-of-in-situ-dextran-coating-on-biocompatibility-stability-and-magnetic-properties-of-iron-oxide-nanoparticles
#12
Zhila Shaterabadi, Gholamreza Nabiyouni, Meysam Soleymani
Biocompatible ferrofluids based on dextran coated iron oxide nanoparticles were fabricated by conventional co-precipitation method. The experimental results show that the presence of dextran in reaction medium not only causes to the appearance of superparamagnetic behavior but also results in significant suppression in saturation magnetization of dextran coated samples. These results can be attributed to size reduction originated from the role of dextran as a surfactant. Moreover, weight ratio of dextran to magnetic nanoparticles has a remarkable influence on size and magnetic properties of nanoparticles, so that the sample prepared with a higher weight ratio of dextran to nanoparticles has the smaller size and saturation magnetization compare with the other samples...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415402/fattigation-platform-theranostic-nanoparticles-for-cancer-therapy
#13
Thao Truong-Dinh Tran, Phuong Ha-Lien Tran, Tae-Jong Yoon, Beom-Jin Lee
A new conceptual nanoparticle consisting of a silica-coated iron oxide magnetic core and a fattigation-based biocompatible shell with oleic acid and hydrophilic protein (gelatin). The prepared particle can be a useful theranostics platform material for diagnostic imaging and as a drug delivery system. Oleic acid and gelatin were conjugated on the silica-coated magnetic nanoparticle surface to provide three primary functionalities: 1) enhancing biocompatibility and solubility in aqueous solution and providing the ability to incorporate hydrophobic chemical drugs into the shell for delivery, 2) improving treatment-response magnetic monitoring as a diagnostic agent with low nanotoxicity, and 3) increasing anticancer efficacy owing to the controlled release of the incorporated drug in cells and in an animal model...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28412681/research-on-in-vitro-release-of-isoniazid-inh-super-paramagnetic-microspheres-in-different-magnetic-fields
#14
Hongmeng Xie, Hua Huang, Wei He, Zhihong Fu, Cong Luo, Muhmmad Aqeel Ashraf
To explore in vitro release rules of isoniazid (INH) when Isoniazid Super paramagnetic Iron Oxide Microspheres (ISPIOM) are subject to no external magnetic field, applied mechanical magnetic field and scillating magnetic field. ISPIOM was prepared by using the spray drying method; Isoniazid contented in the microspheres was determined, the drug loading capacity and encapsulation efficiency were calculated. Release of isoniazid in the microspheres was determined respectively under the effect of no external magnetic field, applied mechanical magnetic field and oscillating magnetic field, to explore the release rules...
November 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28408167/purification-characterization-and-expression-of-transferrin-from-rainbow-trout-seminal-plasma
#15
Joanna Nynca, Mariola A Dietrich, Mikołaj Adamek, Dieter Steinhagen, Barbara Bilińska, Anna Hejmej, Andrzej Ciereszko
Transferrin (TF) is recognized as a multifunctional protein and has been implicated in antioxidative, antimicrobial protection, growth, differentiation and cytoprotection effects. An efficient, original three-step isolation procedure for TF consisting in hydrophobic interaction chromatography, gel filtration and preparative electrophoresis was developed. Rainbow trout TF was found to be N-glycosylated (not O-glycosylated) and phosphorylated at all serine, threonine, and tyrosine residues. The protein consists of several proteoforms with an average molecular weight of 76...
April 11, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28407591/reduction-of-cr-vi-in-simulated-groundwater-by-fes-coated-iron-magnetic-nanoparticles
#16
Yanyan Gong, Longshuang Gai, Jingchun Tang, Jie Fu, Qilin Wang, Eddy Y Zeng
FeS-coated iron (Fe/FeS) magnetic nanoparticles were easily prepared, characterized, and applied for Cr(VI) removal in simulated groundwater. TEM, XRD, and BET characterization tests showed that FeS coating on the surface of Fe(0) inhibited the aggregation of Fe(0) and that Fe/FeS at a S/Fe molar ratio of 0.207 possessed a large surface area of 62.1m(2)/g. Increasing the S/Fe molar ratio from 0 to 0.138 decreased Cr(VI) removal by 42.8%, and a further increase to 0.207 enhanced Cr(VI) removal by 63% within 72h...
April 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28406605/porous-nanobimetallic-fe-mn-cubes-with-high-valent-mn-and-highly-efficient-removal-of-arsenic-iii
#17
Gong Zhang, Xiufang Xu, Qinghua Ji, Ruiping Liu, Huijuan Liu, Jiuhui Qu, Jinghong Li
Iron (Fe) oxides are the most commonly used adsorbent materials for the aqueous removal of Arsenic (As), but they have deficiencies, including low uptake and poor removal of the relatively higher toxicity As(III). Introduction of transition metals into Fe-containing adsorbents, an inexpensive method of altering Fe chemical states, is likewise of interest for removing As(III) from water by means of adsorption. Porous cubic Fe-Mn structures with BET surface area of 450 m(2) g(-1) were herein prepared via chemical etching of Mn-substituted Prussian Blue analogues (PBAs)...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28406012/immunomodulatory-magnetic-microspheres-for-augmenting-tumor-specific-infiltration-of-natural-killer-nk-cells
#18
Wooram Park, Andrew C Gordon, Soojeong Cho, Xiaoke Huang, Kathleen R Harris, Andrew C Larson, Dong-Hyun Kim
The purpose of this research is to develop magnetic resonance imaging (MRI) visible immunomodulatory microspheres (IMM-MS) for efficient image guided cancer immunotherapy. IMM-MS composed of recombinant interferon gamma (IFN-γ), iron oxide nanocubes (IONC), and biodegradable poly(lactide-co-glycolide) (PLGA) were successfully prepared via a double-emulsion method. The prepared IMM-MS exhibited a sustained IFN-γ release and highly sensitive MR T2 contrast effects. Finally, in an orthotopic liver tumor VX2 rabbit model, successful hepatic intra-arterial (IA) transcatheter delivery of IMM-MS to liver tumors was confirmed with MR images...
April 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28402029/magnetic-solid-phase-extraction-based-on-carbon-nanotubes-for-the-determination-of-polyether-antibiotics-and-s-triazine-drug-residues-in-animal-food-with-lc-ms
#19
Xiaoxing Liu, Shuyu Xie, Tengteng Ni, Dongmei Chen, Xu Wang, Yuanhu Pan, Yulian Wang, Lingli Huang, Guyue Cheng, Wei Qu, Zhenli Liu, Yanfei Tao, Zonghui Yuan
Carbon nanotubes-magnetic nanoparticles, comprising ferroferric oxide nanoparticles and carbon nanotubes, were prepared through a simple one-step synthesis method and subsequently applied to magnetic solid-phase extraction for the determination of polyether antibiotic and s-triazine drug residues in animal food coupled with liquid chromatography with tandem mass spectrometry. The nanocomposites were characterized by transmission electron microscopy, X-ray diffraction, and vibrating sample magnetometry. The components within the nanocomposites endowed the material with high extraction performance and manipulative convenience...
April 12, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28401386/a-comprehensive-review-on-removal-of-arsenic-using-activated-carbon-prepared-from-easily-available-waste-materials
#20
Monoj Kumar Mondal, Ravi Garg
Arsenic contamination in water bodies is a serious problem and causes various health problems due to which US Environment Protection Agency (USEPA) set its maximum permissible limit of 10 ppb. The present review article starts with the removal of toxic arsenic using adsorbents prepared from easily available waste materials. Adsorbent either commercial or low-cost adsorbent can be used for arsenic removal but recent research was focused on the low-cost adsorbent. Preparation and activation of various adsorbents were discussed...
April 11, 2017: Environmental Science and Pollution Research International
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