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https://www.readbyqxmd.com/read/28340524/controlled-hydrothermal-synthesis-and-photoluminescence-of-nanocrystalline-znga2o4-cr-3-monospheres
#1
Tian Luan, Jinhan Liu, Xiaoxue Yuan, Ji-Guang Li
The hydrothermal synthesis of nanocrystalline ZnGa2O4:Cr(3+) (ZGC) red phosphor monospheres was accomplished in this work, and the effects of system pH, reactant content, reaction time, and citrate anions (Cit(3-)) on the phase and morphology evolution of the product were systematically studied. Under the optimized conditions of Cit(3-)/M = 1.0 molar ratio (M = total cations), pH = 5.0, and 0.2 mmol of Zn(2+), well-dispersed ZGC monospheres with an average diameter of ~454 ± 56 nm (average crystallite size ~15 nm) were successfully obtained via hydrothermal reaction at 180 °C for 18 h...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340369/degradation-of-diclofenac-by-uv-activated-persulfate-process-kinetic-studies-degradation-pathways-and-toxicity-assessments
#2
Xian Lu, Yisheng Shao, Naiyun Gao, Juxiang Chen, Yansen Zhang, Huiming Xiang, Youluo Guo
Diclofenac (DCF) is the frequently detected non-steroidal pharmaceuticals in the aquatic environment. In this study, the degradation of DCF was evaluated by UV-254nm activated persulfate (UV/PS). The degradation of DCF followed the pseudo first-order kinetics pattern. The degradation rate constant (kobs) was accelerated by UV/PS compared to UV alone and PS alone. Increasing the initial PS dosage or solution pH significantly enhanced the degradation efficiency. Presence of various natural water constituents had different effects on DCF degradation, with an enhancement or inhibition in the presence of inorganic anions (HCO3(-) or Cl(-)) and a significant inhibition in the presence of NOM...
March 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28339833/vdac1-is-a-molecular-target-in-glioblastoma-with-its-depletion-leading-to-reprogrammed-metabolism-and-reversed-oncogenic-properties
#3
Tasleem Arif, Yakov Kerlin, Itay Nakdimon, Daniel Benharroch, Avijit Paul, Daniela Dadon-Klein, Varda Shoshan-Barmatz
Background.: Glioblastoma (GBM), an aggressive brain tumor with frequent relapses and a high mortality, still awaits an effective treatment. Like many cancers, GBM cells acquire oncogenic properties, including metabolic reprogramming, vital for growth. As such, tumor metabolism is an emerging avenue for cancer therapy. One relevant target is the voltage-dependent anion channel 1 (VDAC1), a mitochondrial protein controlling cell energy and metabolic homeostasis. Methods...
February 28, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28339200/accurate-electron-affinities-and-orbital-energies-of-anions-from-a-non-empirically-tuned-range-separated-dft-approach
#4
Lindsey N Anderson, Maria Belen Oviedo, Bryan M Wong
The treatment of atomic anions with Kohn-Sham density functional theory (DFT) has long been controversial since the highest occupied molecular orbital (HOMO) energy, EHOMO, is often calculated to be positive with most approximate density functionals. We assess the accuracy of orbital energies and electron affinities for all three rows of elements in the periodic table (H-Ar) using a variety of theoretical approaches and customized basis sets. Among all of the theoretical methods studied here, we find that a non-empirically tuned range-separated approach (constructed to satisfy DFT-Koopmans' theorem for the anionic electron system) provides the best accuracy for a variety of basis sets - even for small basis sets where most functionals typically fail...
March 24, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28339179/synthesis-of-111-facet-exposed-mgo-with-surface-oxygen-vacancies-for-ros-generation-in-the-dark
#5
Ying-Juan Hao, Bing Liu, Li-Gang Tian, Fa-Tang Li, Jie Ren, Shao-Jia Liu, Ying Liu, Jun Zhao, Xiaojing Wang
Seeking a simple and moderate route to generate reactive oxygen species (ROS) for antibiosis is of great interest and challenge. This work demonstrates that molecule transition and electron rearrangement processes can directly occur only through chemisorption interaction between the adsorbed O2 and high-energy {111} facet-exposed MgO with abundant surface oxygen vacancies (SOVs), hence producing singlet oxygen and superoxide anion radicals without light irradiation. These ROS were confirmed by electron paramagnetic resonance, in-situ Raman and scavenger experiments, respectively...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28335506/a-colorimetric-sensor-for-the-highly-selective-detection-of-sulfide-and-1-4-dithiothreitol-based-on-the-in-situ-formation-of-silver-nanoparticles-using-dopamine
#6
Lingzhi Zhao, Liu Zhao, Yanqing Miao, Chunye Liu, Chenxiao Zhang
Hydrogen sulfide (H₂S) has attracted attention in biochemical research because it plays an important role in biosystems and has emerged as the third endogenous gaseous signaling compound along with nitric oxide (NO) and carbon monoxide (CO). Since H₂S is a kind of gaseous molecule, conventional approaches for H₂S detection are mostly based on the detection of sulfide (S(2-)) for indirectly reflecting H₂S levels. Hence, there is a need for an accurate and reliable assay capable of determining sulfide in physiological systems...
March 20, 2017: Sensors
https://www.readbyqxmd.com/read/28335503/synthesis-of-randomly-substituted-anionic-cyclodextrins-in-ball-milling
#7
László Jicsinszky, Marina Caporaso, Emanuela Calcio Gaudino, Cristina Giovannoli, Giancarlo Cravotto
A number of influencing factors mean that the random substitution of cyclodextrins (CD) in solution is difficult to reproduce. Reaction assembly in mechanochemistry reduces the number of these factors. However, lack of water can improve the reaction outcomes by minimizing the reagent's hydrolysis. High-energy ball milling is an efficient, green and simple method for one-step reactions and usually reduces degradation and byproduct formation. Anionic CD derivatives have successfully been synthesized in the solid state, using a planetary ball mill...
March 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28334681/fluorescent-proteins-such-as-egfp-lead-to-catalytic-oxidative-stress-in-cells
#8
Douglas Ganini, Fabian Leinisch, Ashutosh Kumar, JinJie Jiang, Erik J Tokar, Christine C Malone, Robert M Petrovich, Ronald P Mason
Fluorescent proteins are an important tool that has become omnipresent in life sciences research. They are frequently used for localization of proteins and monitoring of cells [1,2]. Green fluorescent protein (GFP) was the first and has been the most used fluorescent protein. Enhanced GFP (eGFP) was optimized from wild-type GFP for increased fluorescence yield and improved expression in mammalian systems [3]. Many GFP-like fluorescent proteins have been discovered, optimized or created, such as the red fluorescent protein TagRFP [4]...
March 10, 2017: Redox Biology
https://www.readbyqxmd.com/read/28333468/alkyl-chain-length-dependent-structural-and-orientational-transformations-of-water-at-alcohol-water-interfaces-and-its-relevance-to-atmospheric-aerosols
#9
Jahur A Mondal, Vinu Namboodiri, Mathi Pandiyathuray, Ajay K Singh
Although the hydrophobic size of an amphiphile plays a key role in various chemical, biological, and atmospheric processes, its effect at macroscopic aqueous interfaces (e.g. air-water, oil-water, cell membrane-water, etc.) which are ubiquitous in nature is not well understood. Here we report the hydrophobic alkyl chain length dependent structural and orientational transformations of water at alcohol (CnH2n+1OH, n = 1-12)-water interfaces using interface-selective heterodyne-detected vibrational sum frequency generation (HD-VSFG) and Raman multivariate curve resolution (Raman-MCR) spectroscopic techniques...
March 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28333466/covalent-modification-of-glassy-carbon-surfaces-by-electrochemical-grafting-of-aryl-iodides
#10
Line Koefoed, Steen U Pedersen, Kim Daasbjerg
The reduction of an aryl iodide is generally believed to involve a clean-cut two-electron reduction to produce an aryl anion and iodide. This is in contradiction to what is observed if a highly efficient grafting agent, such as an aryldiazonium salt, is employed. The difference in behavior is explained by the much more extreme potentials required for reducing an aryl iodide, which facilitates the further reduction of the aryl radical formed as an intermediate. However, in this study we disclose that electrografting of aryl iodides is indeed possible upon extended voltammetric cycling...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28333460/exceptional-structural-compliance-of-the-b12f12-2-superweak-anion
#11
Dmitry V Peryshkov, Steven H Strauss
The single-crystal X-ray structures, thermogravimetric analyses, and/or FTIR spectra of a series of salts of the B12F12(2-) anion and homoleptic Ag(L)n(+) cations are reported (L = CH2Cl2, n = 2; L = PhCH3, n = 3; L = CH3CN; n = 2-4; L = CO, n = 1, 2). The superweak-anion nature of B12F12(2-) (Y(2-)) was demonstrated by the rapid reaction of microcrystalline Ag2(Y) with 1 atm of CO to form a nonclassical silver(I) carbonyl compound with an FTIR ν(CO) band at 2198 cm(-1) (and with the proposed formula [Ag(CO)n]2[Y])...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28333055/enhanced-adsorption-removal-of-anionic-dyes-via-a-facile-preparation-of-amino-functionalized-magnetic-silica
#12
Xiao-Shui Li, Yu-Han Fan, Shou-Wen Zhang, Shi-Hua Qi
A novel amino-functionalized magnetic silica (Fe3O4@SiO2-NH2) was easily prepared via a one-step method integrating the immobilization of 3-aminopropyltriethoxysilane with a sol-gel process of tetraethyl orthosilicate into a single process. This showed significant improvement in the adsorption capacity of anionic dyes. The product (Fe3O4@SiO2-NH2) was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, zeta potential and vibrating sample magnetometry...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333050/oxidative-treatment-of-diclofenac-via-ferrate-vi-in-aqueous-media-effect-of-surfactant-additives
#13
Yingling Wang, Tianjun Ni, Jianmei Yuan, Chunfeng Wang, Guoguang Liu
The potential reaction of diclofenac (DCF) with ferrate(VI) and influences of coexisting surfactants have not been investigated in depth, and are the focus of this study. The results demonstrated that DCF reacted effectively and rapidly with Fe(VI) and approximately 75% of DCF (0.03 mM) was removed by excess Fe(VI) (0.45 mM) within 10 min. All of the reactions followed pseudo first-order kinetics with respect to DCF and Fe(VI), where the apparent second-order rate constant (kapp) was 5.07 M(-1) s(-1) at pH 9...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333047/mg-al-double-metal-hydroxide-regeneration-of-anion-exchange-resin-by-electric-field-intensification
#14
Ying Wang, Zhun Li, Yansheng Li, Zhigang Liu
Fouled anion exchange resins were regenerated by electric field intensification of Mg/Al double-metal hydroxides. Regenerative experiments were performed with varying voltages (10-30 V) and dosages of Mg/Al hydroxides (0.045-0.135 mol and 0.015-0.045 mol, respectively) for 1-5 h. Optimal results were obtained under the following regenerative conditions: 20 V, 4 h, and 0.09/0.03 mol of Mg/Al hydroxides. The maximum regenerative capacity of resins was increased to 41.07%. The regenerative mechanism was presented by Fourier-transform infrared spectrum of resins and Mg/Al hydroxides, and the regenerative degree was analyzed with respect to conductivity, pH value, and electric current...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332846/me3sicf2br-self-assisted-domino-reaction-catalytic-synthesis-of-%C3%AE-%C3%AE-difluorocyclopentanones-from-methylvinylketones
#15
Jian Chang, Cong Xu, Jie Gao, Fengyun Gao, Dongsheng Zhu, Mang Wang
A complete self-assistance strategy based on Me3SiCF2Br was used in the domino conversion of methylvinylketones into α,α-difluorinated cyclopentanones. Initiated by 5 mol % of nBu4NBr, the multistep reaction occurred in one pot under mild conditions via the in situ formation of silyl dienol ethers, difluorocyclopropanation, thermal vinylcyclopropane-cyclopentene rearrangement, and desilylation. The process takes advantage of the multitasking capability of Me3SiCF2Br as the difluorocarbene source, a silicon-based transfer agent, and a bromine anion releaser...
March 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28332813/competitive-adsorption-of-polyelectrolytes-onto-and-into-pellicle-coated-hydroxyapatite-investigated-by-qcm-d-and-force-spectroscopy
#16
Hyun-Su Lee, Carl Myers, Lynette Zaidel, Prathima Chandra Nalam, Matthew Alexander Caporizzo, Carlo Daep, David M Eckmann, James G Masters, Russell J Composto
A current effort in preventive dentistry is to inhibit surface attachment of bacteria using antibacterial polymer coatings on the tooth surface. For the antibacterial coatings, the physisorption of anionic and cationic polymers directly onto hydroxyapatite (HA) and saliva treated HA surfaces was studied using quartz crystal microbalance, force spectroscopy and atomic force microscopy. First, single species adsorption is shown to be stronger on HA surfaces than on silicon oxide surfaces for all polymers (i.e...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332693/an-electron-transfer-photochromic-crystalline-mof-accompanying-photoswitchable-luminescence-in-a-host-guest-system
#17
Yu-Shuang Liu, Yu-Hui Luo, Li Li, Hong Zhang
A new electron transfer type photoactive host-guest supramolecule was constructed by introducing (CH3)2NH2(+) cations to the MOF framework. The resulting compound 1 exhibits reversible photochromic property without using photochromic components, resulting from photoinduced electron-transfer between the electron-rich anionic framework and the electron-deficient guest ions. In addition, a photoluminescence "on/off switch" occurs during the coloration-decoloration process. The raw materials are non-poisonous and harmless, hence compound 1 may be more cost-effective, clean, and harmless to the heath than existing photochromic materials...
March 23, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28332676/application-of-the-dimensional-reduction-formalism-to-pb9-xbax-li2-p2o7-2-p4o13-2-x-0-2-6-7-a-series-of-phosphates-with-two-types-of-isolated-polyphosphate-groups
#18
Xiangyu Zhang, Hongping Wu, Qiong Liu, Xiaoyu Dong, Yunlei Chen, Zhihua Yang, Xiao-Dong Wen, Shilie Pan
A series of phosphates, Pb9-xBax[Li2(P2O7)2(P4O13)2] (x = 0, 2, 6, 7), have been synthesized by a high temperature solution method and the crystal structures were determined by single crystal X-ray diffraction. They are isostructural and crystallize in the triclinic space group P1[combining macron]. It is interesting that there are two kinds of isolated polyphosphate anionic groups coexisting in the crystal structure, which is rare among phosphates. Their structures exhibit zero-dimensional [Li2(P2O7)2(P4O13)2](18-) anionic clusters constructed by the LiO4, P2O7 and P4O13 groups, which are separated by the Pb(2+) or Ba(2+) cations...
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28332672/formation-of-paramagnetic-metallacyclobutadienes-by-reaction-of-diaminoacetylenes-with-molybdenum-alkylidyne-complexes
#19
Òscar Àrias, Kai Brandhorst, Dirk Baabe, Matthias Freytag, Peter G Jones, Matthias Tamm
The reactions of the molybdenum alkylidyne complex [MesC[triple bond, length as m-dash]Mo{OCMe(CF3)2}3] (1) with the diaminoacetylenes R2NC[triple bond, length as m-dash]CNR2 (2, NR2 = 4-methylpiperidinyl; 3, NR2 = NEt2; Mes = 2,4,6-trimethylphenyl) afforded the metallacyclobutadiene (MCBD) complexes 4 and 5. In contrast to all other MCBD complexes, 4 and 5 are paramagnetic and best described as Mo(iv) species containing an anionic diaminodicarbene of the type [(R2N)CC(Mes)C(NR2)](-).
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28332397/base-catalysis-enables-access-to-%C3%AE-%C3%AE-difluoroalkylthioethers
#20
Douglas L Orsi, Brandon J Easley, Ashley M Lick, Ryan A Altman
A nucleophilic addition reaction of aryl thiols to readily available β,β-difluorostyrenes provides α,α-difluoroalkylthioethers. The reaction proceeds through an unstable anionic intermediate, prone to eliminate fluoride and generate α-fluorovinylthioethers. However, the use of base catalysis overcomes the facile β-fluoride elimination, generating α,α-difluoroalkylthioethers in excellent yields and selectivities.
March 23, 2017: Organic Letters
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