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https://www.readbyqxmd.com/read/28430438/controllable-synthesis-of-lindqvist-alkoxopolyoxovanadate-clusters-as-heterogeneous-catalysts-for-sulfoxidation-of-sulfides
#1
Ji-Kun Li, Jing Dong, Chuan-Ping Wei, Song Yang, Ying-Nan Chi, Yan-Qing Xu, Chang-Wen Hu
Six alkoxohexavanadate-based Cu- or Co-POVs [Cu(dpa)(acac)(H2O)]2[V6O13(OMe)6] (1), [Cu(phen)(acac)(MeOH)]2[V6O13(OMe)6] (2), [Co(dpa)(acac)2]2[V6O13(OMe)6]·2MeOH (3), [Co(phen)(acac)2]2[V6O13(OMe)6] (4), [Cu(dpa)(acac)]2[V(IV)2V(V)4O12(OMe)7] (5), and [Cu(dpa)(acac)(MeOH)]2[V(IV)2V(V)4O11(OMe)8] (6) (POV = polyoxovanadate; dpa = 2,2'-dipyridine amine; phen = 1,10-phenanthroline; acac = acetylacetone anion) have been synthesized by controlling the reaction conditions and characterized by single-crystal X-ray diffraction and powder X-ray diffraction analyses, FT-IR spectroscopy, element analyses, and X-ray photoelectron spectroscopy...
April 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28430285/electrochemical-synthesis-of-phosphorus-doped-graphene-quantum-dots-for-free-radical-scavenging
#2
Yan Li, Sen Li, Yingmin Wang, Jun Wang, Hui Liu, Xinqian Liu, Lifeng Wang, Xiaoguang Liu, Wendong Xue, Ning Ma
In this work, phosphorus-doped graphene quantum dots (P-GQDs) with a high phosphorus doping content (>7 at%) are synthesized via an electrochemical approach. Sodium phytate (C6H6Na12O24P6), a green food antioxidant additive, is used as the electrolyte for providing both a phosphorus source and an electrolysis environment. The obtained P-GQDs exhibit excellent scavenging activity of free radicals, such as hydroxyl radicals (˙OH) and 2,2-diphenyl-1-picrylhydrazyl (DPPH). Combined with Raman, FT-IR, and XPS spectral analyses, the reason for high phosphorus content and the mechanism of free radical scavenging of P-GQDs are investigated in our work...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28430150/synthesis-and-self-assembly-of-shape-amphiphiles-based-on-poss-dendron-conjugates
#3
Yu Shao, Minyuan Ding, Yujie Xu, Fangjia Zhao, Hui Dai, Xia-Ran Miao, Shuguang Yang, Hui Li
Shape has been increasingly recognized as an important factor for self-assembly. In this paper, a series of shape amphiphiles have been built by linking polyhedral oligomeric silsesquioxane (POSS) and a dendron via linkers of different lengths. Three conjugates of octahedral silsesquioxanes (T₈-POSS) and dendron are designed and synthesized and are referred to as isobutyl T₈-POSS gallic acid derivatives (BPOSS-GAD-1, BPOSS-GAD-2, BPOSS-GAD-3). These samples have been fully characterized by ¹H-NMR, (13)C-NMR, Fourier transform infrared (FT-IR) spectroscopy and matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) mass spectrometry to establish their chemical identity and purity...
April 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28429740/micelle-template-synthesis-of-hollow-silica-spheres-for-improving-water-vapor-permeability-of-waterborne-polyurethane-membrane
#4
Yan Bao, Tong Wang, Qiaoling Kang, Chunhua Shi, Jianzhong Ma
Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28428084/metabolomics-of-fescue-toxicosis-in-grazing-beef-steers
#5
Ryan S Mote, Nicholas S Hill, Karan Uppal, ViLinh T Tran, Dean P Jones, Nikolay M Filipov
Fescue toxicosis (FT) results from consumption of tall fescue (Lolium arundinaceum) infected with an endophyte (Epichloë coenophiala) that produces ergot alkaloids (EA), which are considered key etiological agents of FT. Decreased weight gains, hormonal imbalance, circulating cholesterol disruption, and decreased volatile fatty acid absorption suggest toxic (E+) fescue-induced metabolic perturbations. Employing untargeted high-resolution metabolomics (HRM) to analyze E+ grazing-induced plasma and urine metabolome changes, fescue-naïve Angus steers were placed on E+ or non-toxic (Max-Q) fescue pastures and plasma and urine were sampled before, 1, 2, 14, and 28 days after pasture assignment...
April 18, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28427648/sonochemical-synthesis-characterization-and-effects-of-temperature-power-ultrasound-and-reaction-time-on-the-morphological-properties-of-two-new-nanostructured-mercury-ii-coordination-supramolecule-compounds
#6
Payam Hayati, Ali Reza Rezvani, Ali Morsali, Daniel Ruiz Molina, Samira Geravand, Salvio Suarez-Garcia, Miguel Angel Moreno Villaecija, S García-Granda, Rafael Mendoza-Meroño, Pascal Retailleau
Two new mercury(II) coordination supramolecular compounds (CSCs) (1D and 0D), [Hg(L)(I)2]n (1) and [Hg2(L')2(SCN)2]·2H2O (2) (L=2-amino-4-methylpyridine and L'=2,6-pyridinedicarboxlic acid), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by field emission scanning electron microscope (FESEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427646/investigate-the-ultrasound-energy-assisted-adsorption-mechanism-of-nickel-ii-ions-onto-modified-magnetic-cobalt-ferrite-nanoparticles-multivariate-optimization
#7
Fatemeh Mehrabi, Ebrahim Alipanahpour Dil
In present study, magnetic cobalt ferrite nanoparticles modified with (E)-N-(2-nitrobenzylidene)-2-(2-(2-nitrophenyl)imidazolidine-1-yl) ethaneamine (CoFe2O4-NPs-NBNPIEA) was synthesized and applied as novel adsorbent for ultrasound energy assisted adsorption of nickel(II) ions (Ni(2+)) from aqueous solution. The prepared adsorbent characterized by Fourier transforms infrared spectroscopy (FT-IR), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD). The dependency of adsorption percentage to variables such as pH, initial Ni(2+) ions concentration, adsorbent mass and ultrasound time were studied with response surface methodology (RSM) by considering the desirable functions...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427641/facile-sonochemical-synthesis-of-tellurium-and-tellurium-dioxide-nanoparticles-reducing-te-iv-to-te-via-ultrasonic-irradiation-in-methanol
#8
Fatemeh Arab, Mehdi Mousavi-Kamazani, Masoud Salavati-Niasari
In this study, tellurium (Te) nanostructures were synthesized via a facile sonochemical method by reducing TeCl4 to Te under ultrasonic irradiation in methanol. Moreover, by carrying out the reaction in an alkaline environment TeO2 nanoparticles were produced. According to our knowledge, it is the first time that without secondary reducing agent Te(4+) are reduced to Te. Also, the effects of ultrasonic power, irradiation time, solvent, and surfactant on the morphology and particle size of Te nanostructures were investigated...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427636/ultrasound-assisted-synthesis-of-nano-structured-zinc-ii-based-metal-organic-frameworks-as-precursors-for-the-synthesis-of-zno-nano-structures
#9
Fahime Bigdeli, Hosein Ghasempour, Alireza Azhdari Tehrani, Ali Morsali, Hassan Hosseini-Monfared
A 3D, porous Zn(II)-based metal-organic framework {[Zn2(oba)2(4-bpmn)]·(DMF)1.5}n (TMU-21), (4-bpmn=N,N'-Bis-pyridin-4-ylmethylene-naphtalene-1,5-diamine, H2oba=4,4'-oxybis(benzoic acid)) with nano-rods morphology under ultrasonic irradiation at ambient temperature and atmospheric pressure was prepared and characterized by scanning electron microscopy. Sonication time and concentration of initial reagents effects on the size and morphology of nano-structured MOFs were studied. Also {[Zn2(oba)2(4-bpmn)] (TMU-21) and {[Zn2(oba)2(4-bpmb)] (TMU-6), 4-bpmb=N,N'-(1,4-phenylene)bis(1-(pyridin-4-yl)methanimine) were easily prepared by mechanochemical synthesis...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427624/ultrasound-assisted-biodiesel-production-by-a-novel-composite-of-fe-iii-based-mof-and-phosphotangestic-acid-as-efficient-and-reusable-catalyst
#10
Ahmad Nikseresht, Asra Daniyali, Mahdi Ali-Mohammadi, Ahmad Afzalinia, Abbas Mirzaie
In this work, esterification of oleic acid by various alcohols is achieved with high yields under ultrasonic irradiation. This reaction performed with a novel heterogeneous catalyst that fabricated by heteropoly acid and Fe(III)-based MOF, namely MIL-53 (Fe). Syntheses of MIL-53 and encapsulation process carry out by ultrasound irradiation at ambient temperature and atmospheric pressure. The prepared composite was characterized by various techniques such as XRD, FT-IR, SEM, BET and ICP that demonstrate excellent catalytic activities, while being highly convenient to synthesize...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427615/utilization-of-ultrasonic-irradiation-as-a-green-and-effective-strategy-to-prepare-poly-n-vinyl-2-pyrrolidone-modified-nano-copper-ii-oxide-nanocomposites
#11
Shadpour Mallakpour, Atefeh Jarahiyan
The present paper describes the result of investigations into preparation of novel nanocomposites (NCs) based on poly(N-vinyl-2-pyrrolidone) (PVP) as a biocompatible polymer and modified copper (II) oxide nanoparticles (NPs) as a nano-filler. To achieve optimum NCs properties, different ratios of modified copper (II) oxide NPs (3, 5, and 7wt%) were used to fabricate PVP NCs and also the ultrasonic irradiation was utilized to perform these processes as a fast and effective method. Subsequently, the structure of the obtained nanohybrids was characterized by various techniques...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426935/manipulation-of-mg2-ca2-switch-on-the-development-of-bone-mimetic-hydroxyapatite
#12
Nancy C Andrés, Noelia L D'Elía, Juan M Ruso, Adrián Esteban Campelo, Virginia L Massheimer, Paula V Messina
Ionic substitution can affect essential physicochemical properties leading to a specific biological behavior upon implantation. Therefore it has been proposed as a tool to increase the biological efficiency of calcium phosphate based materials. In the following study we have evaluated the contribution of an important cation in nature, Mg2+, into the structure of previously studied biocompatible and biodegradable hydroxyapatite (HA) nano-rods and its subsequent effect on its chemical, morphology and bone mimetic articulation...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28426923/potassium-promoted-molybdenum-carbide-as-a-highly-active-and-selective-catalyst-for-co2-conversion-to-co
#13
Marc D Porosoff, Jeffrey W Baldwin, Xi Peng, Giannis Mpourmpakis, Heather D Willauer
The high concentration of CO2 bound in seawater represents a significant opportunity to extract and use this CO2 as a C1 feedstock for synthetic fuels. Through an existing process patented by the U.S. Navy, CO2 and H2 can be concurrently extracted from seawater, then catalytically reacted to produce synthetic fuel. Hydrogenating CO2 directly into liquid hydrocarbons is exceptionally difficult, but by first identifying a catalyst for selective CO production via reverse water-gas shift (RWGS), CO can then be hydrogenated to fuel through Fischer-Tropsch (FT) synthesis...
April 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28425858/nano-encapsulation-of-dietary-phytoconstituent-capsaicin-on-emulsome-evaluation-of-anticancer-activity-through-the-measurement-of-liver-oxidative-stress-in-rats
#14
Tapan Kumar Giri, Kaustav Pramanik, Tapan Kumar Barman, Subhasis Maity
Protective effects of capsaicin (CAP) loaded nano-emulsomes (EML) was evaluated against the oxidative stress of rat livers induced through sodium fluoride (NaF). EML was prepared by thin film hydration method that is development of thin lipid film followed by hydration and sonication. EML was characterized by Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) techniques. In vitro drug release study of optimized formulation showed that 50% of CAP was released within 50.21 min while 85% CAP was released in 227...
April 19, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28425546/variable-coordination-of-tris-2-pyridyl-phosphine-and-its-oxide-toward-m-hfac-2-a-metal-specifiable-switching-between-the-formation-of-mono-and-bis-scorpionate-complexes
#15
Alexander V Artem'ev, Alexey V Kashevskii, Artem S Bogomyakov, Alexander Yu Safronov, Anastasiya O Sutyrina, Anton A Telezhkin, Irina V Sterkhova
An unexpected substitution of the anionic chelating ligands at the M(II) centre by a neutral tripodal ligand has been observed in the reaction of Mn(II), Co(II), Ni(II) and Cu(II) hexafluoroacetylacetonates (hfac) with tris(2-pyridyl)phosphine (Py3P) or its oxide (Py3P = O). The nature of the metal ion in M(hfac)2 and the M/L ratio determine the degree of substitution of hfac-anions (partial vs. total) and therefore, the structure of the complex formed (scorpionate vs. bis-scorpionate ones, respectively). Hence, the reaction of the ligands with [Cu(hfac)2(H2O)2] in an equimolar ratio affords scorpionate [Cu(N,N',N''-Py3P = X)(O,O'-hfac)(O-hfac)], wherein one hfac-ligand chelates metal, while the other hfac acts as an O-monodentate one...
April 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28425323/enhanced-solubility-of-piperine-using-hydrophilic-carrier-based-potent-solid-dispersion-systems
#16
Thenmozhi Kathavarayan, Young Je Yoo
CONTEXT: Piperine alkaloid, an important constituent of black pepper exhibits numerous therapeutic properties whereas its usage as a drug is limited due to its poor solubility in aqueous medium, which leads to poor bioavailability. OBJECTIVE: Herein a new method has been developed to improve the solubility of this drug based on the development of solid dispersions with improved dissolution rate using hydrophilic carriers such as sorbitol (Sor), polyethylene glycol (PEG) and polyvinyl pyrrolidone K30 (PVP) by solvent method...
April 20, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/28424825/a-magnetized-nanoparticle-based-solid-phase-extraction-procedure-followed-by-inductively-coupled-plasma-atomic-emission-spectrometry-to-determine-arsenic-lead-and-cadmium-in-water-milk-indian-rice-and-red-tea
#17
Salameh Azimi, Zarrin Es'haghi
A sensitive and simple method using magnetic multi-walled carbon nanotube (MWCNTs-Fe3O4 MNP), as the adsorbent, has been successfully developed for extraction and pre-concentration of arsenic, lead and cadmium with detection by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The nanosorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction pattern (XRD), vibrating sample magnetometer (VSM) and transmission electron microscopy (TEM). The key factors affecting the signal intensity such as pH, adsorbent amount, etc...
April 19, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28424564/new-developments-in-the-management-of-narcolepsy
#18
REVIEW
Vivien C Abad, Christian Guilleminault
Narcolepsy is a life-long, underrecognized sleep disorder that affects 0.02%-0.18% of the US and Western European populations. Genetic predisposition is suspected because of narcolepsy's strong association with HLA DQB1*06-02, and genome-wide association studies have identified polymorphisms in T-cell receptor loci. Narcolepsy pathophysiology is linked to loss of signaling by hypocretin-producing neurons; an autoimmune etiology possibly triggered by some environmental agent may precipitate hypocretin neuronal loss...
2017: Nature and Science of Sleep
https://www.readbyqxmd.com/read/28422658/equivalent-magnetic-noise-in-magnetoelectric-laminates-comprising-bidomain-linbo-sub-3-sub-crystals
#19
Joao Vidal, Andrey V Turutin, Ilya V Kubasov, Mikhail D Malinkovich, Yurii N Parkhomenko, Svetlana P Kobeleva, Andrei L Kholkin, Nikolai A Sobolev
The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with opposite spontaneous polarization vectors. Impedance, ME effect and equivalent magnetic noise density measurements have been performed under quasi-static and resonant conditions...
April 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422382/quantum-dots-based-fluorescence-resonance-energy-transfer-biosensor-for-monitoring-cell-apoptosis
#20
Chunchuan Gu
The development of advanced methods for accurately monitoring cell apoptosis has extensive significance in the diagnostic and pharmaceutical fields. In this study, we developed a rapid, sensitive and selective approach for the detection of cell apoptosis by combining the site-specific recognition and cleavage of the DEVD-peptide with quantum dots (QDs)-based fluorescence resonance energy transfer (FRET). Firstly, biotin-peptide was conjugated on the surface of AuNPs to form AuNPs-pep through the formation of an Au-S bond...
April 19, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
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