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Dong-Ning Li, Ai-Jun Wang, Jie Wei, Qian-Li Zhang, Jiu-Ju Feng
Herein, we developed a facile one-pot co-reduction method to fabricate highly dentritic platinum-palladium/palladium core-shell nanocrystals on reduced graphene oxide (PtPd@Pd NCs/rGO), where poly-l-lysine (PLL) worked as the eco-friendly structure director and stabilizer. The nanocomposite was mainly characterized by microscopic analysis, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA), along with the discussion of the formation mechanism. The synthesized PtPd@Pd NCs/rGO have the enlarged electrochemically active surface area (ECSA) of 51...
December 2, 2017: Journal of Colloid and Interface Science
Doris E Braun, Katharina Raabe, Anna Schneeberger, Volker Kahlenberg, Ulrich J Griesser
The moisture- and temperature dependent stabilities and interrelation pathways of the practically relevant solid forms of o-phenanthroline HCl (1) and neocuproine HCl (2) were investigated using thermal analytical techniques (HSM, DSC and TGA) and gravimetric moisture sorption/desorption studies. The experimental stability data were correlated with the structural changes observed upon dehydration and the pairwise interaction and lattice energies calculated. For 1 the monohydrate was identified as the only stable form under conditions of RH typically found during production and storage, but at RH values >80% deliquescence occurs...
December 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Mhamad Aly Moussawi, Sébastien Floquet, Pavel A Abramov, Cristian Vicent, Mohamed Haouas, Emmanuel Cadot
Self-assembly reactions of Na2WO4, SeO2/SeO32-, and [Mo2O2(μ-S)2(H2O)6]2+ give, depending on the pH value, two new large polyoxometalate complexes: i.e., [(γ-Se2W14O52)3(Mo2O2(μ-S)2(H2O)2)6]24- (1) isolated at pH 3.5 and [(γ-Se2W14O52)4(WO3(H2O))8(W2O5)2(W4O12)2(Mo2O2(μ-S)2(H2O)2)4(Mo2O2(μ-S)2(SeO3))4]36- (2) isolated at pH 2. Both compounds were characterized in the solid state by single-crystal X-ray diffraction, EDX, elemental analysis, TGA, and FT-IR and in solution by ESI-MS and NMR.
December 15, 2017: Inorganic Chemistry
Sauvik Chatterjee, Piyali Bhanja, Luna Paul, Mahammad Ali, Asim Bhaumik
Heterogeneous catalysts play a key role in addressing the economic and environmental issues of the chemical industry due to their several advantages, like ease of product separation, work-up and high recycling efficiency. Herein, we report the synthesis of a robust manganese(iv)-containing aluminophosphate material (MnAPO-5), with an AFI framework topology. This material has been characterized thoroughly by powder XRD, XPS, UHR TEM, FE SEM, 31P CP MAS NMR, atomic absorption spectroscopy, UV-visible spectroscopy and TGA...
December 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Oday H Ahmed, Mohammednoor Altarawneh, Mohammad Al-Harahsheh, Zhong-Tao Jiang, Bogdan Z Dlugogorski
Hydrogen halides (HCl/HBr) represent major halogen fragments from the thermal decomposition of halogen laden materials, most notably PVC and brominated flame retardants (BFRs). Co-pyrolysis of halogen-containing solid waste with metal oxides is currently deployed as a mainstream strategy to treat halogen content as well as to recycle the valuable metallic fraction embedded in electric arc furnace dust (EAFD) and e-waste. However, designing an industrial-scale recycling facility necessitates accurate knowledge on mechanistic and thermo-kinetic parameters dictating the interaction between metal oxides and hydrogen halides...
December 15, 2017: Physical Chemistry Chemical Physics: PCCP
Cecilia C S Yeung, Scott McElhone, Xue Yan Chen, David Ng, Barry E Storer, H Joachim Deeg, Min Fang
Myelodysplastic syndromes (MDS) are a heterogeneous group of diseases with varying genetic aberrations. Half of MDS patients have normal karyotype, obscuring the underlying condition indicating a need for new markers for improved diagnostics and prognosis. We performed a retrospective review of sequential MDS patients who underwent chromosomal genetic array testing (CGAT) between November 2008 and March 2014. Total Genomic Aberration (TGA) scores, with and without copy-neutral loss of heterozygosity (cnLOH), were compared to pathology and clinical data...
December 15, 2017: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
Qingge Feng, Huidong Cai, Haiying Lin, Siying Qin, Zheng Liu, Dachao Ma, Yuyang Ye
TiO2 aerogel is a unique three-dimensional porous nano-particle material with the characteristics of high specific surface area and good light transmittance. In this paper, a novel method involving ultrasonic-assisted sol-gel, solvent exchange, and vacuum drying was successfully developed to synthesis the TiO2 aerogel. The morphology and properties of the prepared TiO2 aerogels were characterized by Brunauer-Emmett-Teller theory (BET), X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM), Energy dispersive spectroscopy (EDS), Thermogravimetric analysis-Differential thermal analysis (TGA-DTA), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy...
December 14, 2017: Nanotechnology
Hongli Jia, Qi Li, Aruuhan Bayaguud, Yichao Huang, Shan She, Kun Chen, Yongge Wei
In this work, we confirmed that the copper-catalysed azide-alkyne cycloaddition (CuAAC) reaction is an effective method for the organic-functionalization of polyoxometalates (POMs). Herein, for the first time, four novel 1,2,3-triazole functionalized polyoxovanadate (POV) organic-inorganic hybrids, (Bu4N)2[V6O13{(OCH2)3C5H6N3O}2]·1.5CH3CN 2, (Bu4N)2[V6O13{(OCH2)3C7H8N3O2}2]·2CH3CN 3, (Bu4N)2[V6O13{(OCH2)3C11H10N3}2] 4 and (Bu4N)2[V6O13{(OCH2)3C10H7N3Cl}2] 5 were prepared through the CuAAC reaction using the azide functionalized hexavanadate, (Bu4N)2[V6O13{(OCH2)3CCH2N3}2]·2...
December 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Violeta Purcar, Raluca Şomoghi, Sabina Georgiana Niţu, Cristian-Andi Nicolae, Elvira Alexandrescu, Ioana Cătălina Gîfu, Augusta Raluca Gabor, Hermine Stroescu, Raluca Ianchiş, Simona Căprărescu, Ludmila Otilia Cinteză
Hybrid nanomaterials based on zinc oxide were synthesized via the sol-gel method, using different silane coupling agents: (3-glycidyloxypropyl)trimethoxysilane (GPTMS), phenyltriethoxysilane (PhTES), octyltriethoxysilane (OTES), and octadecyltriethoxysilane (ODTES). Morphological properties and the silane precursor type effect on the particle size were investigated using dynamic light scattering (DLS), environmental scanning electron microscopy (ESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD)...
December 12, 2017: Nanomaterials
Rafael Estevez, Ivan Iglesias, Diego Luna, Felipa M Bautista
The etherification of glycerol with tert-butyl alcohol in the liquid phase, over different sulfonic acid functionalized zeolites, has been studied. The reaction was carried out using microwaves as a way of heating, measured at autogenous pressure and without any solvent. Dealuminated HY and HZSM-5 zeolites by acid treatment were functionalized with two different organosilica precursors: 3-mercaptopropyltrimethoxysilane (M), which incorporates thiol groups, and 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane (C), which incorporates the sulfonic acid groups directly...
December 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Shaan Bibi Jaffri, Khuram Shahzad Ahmad
The present study has demystified the first and single step prunosynthesis of the spherical silver nanoparticles (AgNPs) from aqueous fruit extract of angiospermic plant, Prunus cerasifera, which has remarkable fusion of reducing cum stabilizing bioactive components (phenols, anthocyanins, carotenoids, flavonoids, organic acids, tannins and vitamins). Highly stable prunosynthetic AgNPs with 2.04 nm average crystallite size were synthesized in dark and in sunlight at optimized condition of temperature, time and P...
December 11, 2017: Artificial Cells, Nanomedicine, and Biotechnology
Mukesh Dhanka, Chaitra Shetty, Rohit Srivastava
Recently, polysaccharides based microparticles have been found to offer an attractive potential as a carrier in drug delivery field. In this study, bare gellan gum microparticles (GG MPs) and methotrexate (MTX) loaded gellan gum microparticles (MTX-GG MPs) prepared by using simple water-in-oil (W/O) emulsion solvent diffusion method. The developed microparticles (MPs) were found discretely distributed in a spherical shape. MTX has been encapsulated in microparticles with 84.8±1.68% encapsulation efficiency (%EE) and 6...
December 6, 2017: International Journal of Biological Macromolecules
Lei Chen, Jun Meng, Junmiao Zhai, Pinsan Xu, Yushi Luan
Plants have evolved a variety of mechanisms to perceive and resist the assault of pathogens. The biotrophs, necrotrophs and hemibiotrophs are types of plant pathogens that activate diverse salicylic acid (SA) and jasmonic acid (JA) signaling pathways. In this study we showed that the expressions of miR396a-5p and -3p in Solanum lycopersicum (S. lycopersicum) were both down-regulated after infection by hemibiotroph Phytophthora infestans (P. infestans) and necrotroph Botrytis cinerea (B. cinerea) infection. Overexpression of miR396a-5p and -3p in transgenic tomato enhanced the susceptibility of S...
December 2017: Plant Science: An International Journal of Experimental Plant Biology
Ponnusamy Senthil Kumar, Sunita J Varjani, Subburaj Suganya
The present work explains the biosorption of malachite green dye from aquatic systems by nano zero valent iron stacked activated carbon (NZVI-AC), which was prepared by dual surface modification strategy. NZVI-AC was characterized by using FTIR, SEM-EDX, XRD and TGA. NZVI-AC exhibited efficient performance in dye biosorption properties. Experimental variables such as time, pH, dye concentration, temperature and biosorbent dosage influenced Langmuir adsorption capacity of 187.3 mg/g. The present biosorption system was best described by pseudo-first order kinetics...
December 6, 2017: Bioresource Technology
Adilson R Prado, Arnaldo G Leal-Junior, Carlos Marques, Samara Leite, Geovane L de Sena, Luiz C Machado, Anselmo Frizera, Moises R N Ribeiro, Maria José Pontes
This paper proposes the recycling of poly (methyl methacrylate) plates, formerly used in LCD monitors to produce polymer optical fibers without cladding for sensor systems and a discussion about the fabrication process of the fiber cladding is briefly presented. After disassembling LCD monitors the acrylic plate is cleaned and submitted to an extrusion process. Extrusion temperatures of 220°C, 230°C and 240°C were applied, and the produced polymer fibers were characterized by infrared and visible spectrometry, as well as evaluated for thermal analysis through differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA)...
November 27, 2017: Optics Express
S Senthilkumar, Minaxi S Maru, R S Somani, H C Bajaj, Subhadip Neogi
Amine-functionalised framework NH2-MIL-101(Al) was synthesized using a solvothermal and microwave method and characterized by PXRD, FT-IR, TGA, SEM-EDX, and BET surface area analysis. The desolvated framework, in the presence of co-catalyst tetrabutylammonium bromide (TBAB), acted as an excellent heterogeneous catalyst for the solvent-free cycloaddition of carbon dioxide (CO2) with epoxides, affording five-membered cyclic carbonates. Using styrene oxide, the NH2-MIL-101(Al)/TBAB system showed more than 99% conversion, affording 96% yield and 99% selectivity with a turn over frequency of 23...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Diana Gómora-Herrera, Juan Navarrete Bolaños, Irina V Lijanova, Octavio Olivares-Xometl, Natalya V Likhanova
No abstract text is available yet for this article.
January 1, 2017: Applied Spectroscopy
Edwin Makhado, Sadanand Pandey, Philiswa N Nomngongo, James Ramontja
In this work, xanthan gum-cl-poly acrylic acid (XG-cl-pAA) hydrogel and xanthan gum-cl-poly acrylic acid/oxidized MWCNTs (XG-cl-pAA/o-MWCNTs) hydrogel nanocomposite was successfully surface modify by microwave assisted copolymerization, in which N, N'-methylenebisacrylamide (MBA) was used as a cross-linking agent. A copolymerization of acrylic acid (AA) onto xanthan gum (XG) initiated by microwave radiation method. Different weight percentages of oxidized MWCNTs were incorporated into the hydrogel matrix during the grafting reaction...
November 21, 2017: Journal of Colloid and Interface Science
Wen-Juan Ji, Rui-Qing Hao, Wei-Wei Pei, Lin Feng, Quan-Guo Zhai
Two novel isoreticular cadmium metal-organic frameworks (MOFs) with the framework formula of [Cd2(BPTC)(solvent)3] (H4BPTC = 3,3',5,5'-biphenyltetracarboxylic acid) have been constructed under diverse reaction conditions and characterized by single crystal X-ray diffraction, PXRD, IR and TGA. The neutral 3D frameworks of 1 and 2 with one-dimensional (1D) rhombic channels exhibit both distinct uptake and good selectivity for cationic methylene blue (MB) dye molecules. The adsorption capacity and adsorption kinetic constant of 2 are greater than those of 1, showing the importance of porosity and pore size during the adsorption...
December 7, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Samad Hosseini Sadr, Soodabeh Davaran, Effat Alizadeh, Roya Salehi, Ali Ramazani
Great efforts have been made to develop drug carriers with the aim of providing predictable therapeutic response. Moreover, combination therapies have become promising strategies for clinical cancer treatment with synergistic effects. The present study purposed to develop a new stimuli-responsive paramagnetic nanocarrier for the intracellular co-delivery of doxorubicin (DOX) and methotrexate (MTX) to the MCF7 cell line. A novel thermo/pH-sensitive amphiphilic paramagnetic nanocomposite comprised of hydrophobic and biodegradable PCL segments and a hydrophilic biocompatible P(NIPAAm-co-HEMA-co-MAA-co-TMSPMA) block was designed and synthesized by combining the ring opening and free radical polymerization methods...
December 7, 2017: Journal of Biomaterials Science. Polymer Edition
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