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Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry

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https://www.readbyqxmd.com/read/28334489/ce-iv-gd-iii-mixed-oxides-as-hosts-for-er-iii-based-upconversion-phosphors
#1
Cecilia Sorbello, Petra Gross, Cristian A Strassert, Matías Jobbágy, Beatriz C Barja
A family of Er(III) and Er(III) -Yb(III) based nanophosphors, hosted in monophasic oxidic Ce(IV) -Gd(III) binary solid solutions, was prepared. The samples were formulated with a constant Er(III) content as the activator, with the eventual addition of Yb(III) as a sensitizer. The amorphous Ce0.94-x Gdx Er0.06 (OH)CO3 ⋅H2 O and Ce0.94-x Gdx Er0.05 Yb0.01 (OH)CO3 ⋅H2 O precursors were prepared by following the urea method to obtain monodispersed spheres of tunable size ranging from 30 to 450 nm. After being decomposed at 1273 K under an atmosphere of air, the precursors of 200 nm in diameter evolved into monophasic polycrystalline particles preserving the parent shape and size...
March 23, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28323365/the-challenges-and-opportunities-of-contemporary-polymer-mechanochemistry
#2
EDITORIAL
Roman Boulatov
No abstract text is available yet for this article.
March 21, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28322490/modifying-%C3%AE-al2o3-surface-with-y2sn2o7-pyrochlore-on-monolayer-dispersion-behaviour-of-composite-oxides
#3
Xianglan Xu, Fang Liu, Jinshu Tian, Honggen Peng, Wenming Liu, Xiuzhong Fang, Ning Zhang, Xiang Wang
To investigate the dispersion behaviours of composite oxides onto the supports, and to achieve better supports for Pd for CO oxidation, a series of Y2Sn2O7/Al2O3 composite oxides with different Y2Sn2O7 loadings were prepared via deposition-precipitation method. Using XRD and XPS extrapolation methods, it is revealed that similar to single component metal oxides, composite oxides can also disperse spantaneously onto the support surfaces to form a monlayer with a certain capacity. The monolayer dispersion capacity/threshhold for Y2Sn2O7 on γ-Al2O3 surface is 0...
March 21, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28319295/cytosine-radical-cation-a-gas-phase-study-combining-irmpd-spectroscopy-uv-pd-spectroscopy-ion-molecule-reactions-and-theoretical-calculations
#4
Michael Lesslie, John T Lawler, Andy Dang, Joseph A Korn, Daniel Bim, Vincent Steinmetz, Philippe Maitre, Frantisek Turecek, Victor Ryzhov
The radical cation of cytosine (Cyt*+) was generated via dissociative oxidation from a ternary Cu(II) complex in the gas phase. The radical cation was characterized by infrared multiple photon dissociation (IRMPD) spectroscopy in the fingerprint region, UV-VIS photodissociation (UV-PD), ion-molecule reactions, and theoretical calculations (density functional theory and ab initio). The IRMPD experimental spectrum has diagnostic bands for two enol/amino and two keto/amino tautomers of Cyt*+, that were calculated to be among the lowest-energy isomers in concert with a previous work (J...
March 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28319290/role-of-dissolved-and-molecular-oxygen-on-cu-and-ptcu-alloy-particle-structure-during-laser-ablation-synthesis-in-liquids
#5
Galina Marzun, Helmut Bönnemann, Christian Lehmann, Bernd Spliethoff, Claudia Weidenthaler, Stephan Barcikowski
The role of molecular oxygen dissolved in the solvent is often discussed as being an influential factor on particle oxidation during pulsed laser ablation in liquids. However, the formation of the particles during laser synthesis takes place under extreme conditions that enable the decomposition of the liquid medium. Reactive species of the solvent may then affect particle formation due to a chemical reaction in the reactive plasma. Experimental results show a difference between the role of dissolved molecular oxygen and the contribution from the oxygen in water molecules...
March 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28317241/organogels-from-double-chained-vitamin-c-amphiphilic-derivatives
#6
Pierandrea Lo Nostro, Elia Tempestini, Martina Bucci, Vincenzo Mastromartino, Marianna Gori, Damiano Tanini, Moira Ambrosi, Emiliano Fratini, Antonella Capperucci
We report on the synthesis and physico-chemical characterization of double chained amphiphilic compounds obtained from vitamin C: Di-alkanoyl-5,6-O-ascorbic acid esters, Di-ASCn, with n = 8, 10 and 12. The acetyl-5-dodecanoyl-6-ascorbic acid ester was synthesized and investigated for comparison. These products are quite insoluble in water and in polar solvents, while they form homogeneous dispersions in cyclohexane. By cooling, these dispersions turn into a gel-like phase. DSC, FTIR, and SAXS/WAXS experiments were carried out to investigate the properties of the pure solids and of their liquid dispersions...
March 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28303650/enzymatic-electrosynthesis-of-formic-acid-through-co2-reduction-in-bioelectrochemical-system-bes-effect-of-immobilization-and-carbonic-anhydrase-addition
#7
Sandipam Srikanth, Yolanda Alvarez Gallego, Karolien Vanbroekhoven, Deepak Pant
Enzymatic electrosynthesis of formic acid from carbon dioxide (CO2) reduction using formate dehydrogenase (FDH) as catalyst at cathode both in its free and immobilized forms was studied in detail in bioelectrochemical system (BES). The essential role of solubilizing CO2 for its conversion was also studied by adding carbonic anhydrase (CA) to the FDH enzyme both in free and immobilized forms. FDH alone in the free form showed large variation in reduction current (-6.2±3.9 A/m2), while the immobilized form showed less variation (-3...
March 17, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28301717/glucose-triggered-insulin-release-from-fe3-cross-linked-alginate-hydrogel-experimental-study-and-theoretical-modeling
#8
Evgeny Katz, Sabrina Scheja, Sergii Domanskyi, Maria Gamella, Kelly L Wormwood, Costel C Darie, Arshak Poghossian, Michael J Schöning, Artem Melman, Vladimir Privman
We study the mechanisms involved in the release, triggered by the application of glucose, of insulin entrapped in Fe3+-cross-linked alginate hydrogel particles further stabilized with a polyelectrolyte. Platelet-shaped alginate particles are synthesized containing enzyme glucose oxidase conjugated with silica nanoparticles, which are also entrapped in the hydrogel. Glucose diffuses in from solution, and production of hydrogen peroxide is catalyzed by the enzyme within the hydrogel. We argue that, specifically for the Fe3+-cross-linked systems, the produced hydrogen peroxide is further converted to free radicals via a Fenton-type reaction catalyzed by the iron cations...
March 16, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28297133/inhibitory-mechanism-of-egcg-on-fibrillation-and-aggregation-of-amidated-human-islet-amyloid-polypeptide
#9
Zhixue Xu, Gongli Ma, Qiang Zhang, Congheng Chen, Yanming He, Lihui Xu, Guangrong Zhou, Zhenhua Li, Hongjie Yang, Ping Zhou
The abnormal fibrillation of human islet amyloid polypeptide (hIAPP) is associated with development of T2DM. EGCG can bind amyloid proteins to inhibit the fibrillation of these proteins. Here, we sought to investigate the effect of EGCG on amidated hIAPP (hIAPP-NH2) fibrillation and aggregation by using spectroscopic and microscopic techniques, and also sought to view insight into the interaction of EGCG and hIAPP22-27 by using spectroscopic experiments and quantum chemical calculations. ThT fluorescence, real-time NMR and TEM studies demonstrated that EGCG could inhibit the formation of hIAPP-NH2 fibrils, while promote the formation of hIAPP-NH2 amorphous aggregates...
March 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295982/light-harvesting-and-photocurrent-generation-in-a-conjugated-polymer-nanoparticle-reduced-graphene-oxide-composite
#10
Amitava Patra, Arnab Ghosh, Bikash Jana, Sourav Maiti, Rajesh Bera, Hiren Ghosh
Polymer - graphene nanocomposites are promising candidates towards light harvesting systems such as photocatalysis, photovoltaics; where significant charge separation occurs due to photoinduced electron transfer. Much attention has been paid to use reduced graphene oxide (r-GO) as template for anchoring various nanomaterials due to its efficient electron accepting and transport property. Here, we have prepared Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) nanoparticles from MEH-PPV polymer and investigate the change in photophysical properties due to formation of polymer nanoparticles from molecular state by using steady state and time resolved spectroscopy...
March 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295927/phenoxazine-derivative-operates-as-an-efficient-surface-grafted-molecular-relay-to-enhance-cds-and-cdse-sensitized-tio2-solar-cells-performances-and-stability
#11
Chao Shen, Xingzhu Wang, Shasha Tang, Marc Courté, Denis Fichou
We report on a new phenoxazine derivative, 10-butyl-phenoxazine-3-carboxylic acid (BPCA), that we designed to operate as a molecular relay in semiconductor-sensitized solar cells (SSCs). After BPCA surface modification and in the presence of a cobalt-bipyridyl complex acting as a redox mediator, both TiO2/CdS/BPCA and TiO2/CdSe/BPCA SSCs exhibit enhanced photovoltaic performances and stability. In particular, the power conversion efficiencies of CdS and CdSe-based solar cells are improved by 90% and 57%, respectively...
March 14, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295910/an-analysis-of-nitroxide-based-distance-measurements-in-cell-extract-and-in-cell-by-pulsed-esr-spectroscopy
#12
Sunil Kumar Saxena, Matthew J Lawless, Amit Shimshi, Timothy F Cunningham, Monica N Kinde, Pei Tang
Distance measurements in-cell by pulsed ESR present tremendous opportunities to study proteins in a more native environment that is irreproducible in vitro. However, the in-cell environment is harsh towards the typical nitroxide radical used in DEER experiments. We perform a systematic examination of the loss of the DEER signal including contributions from nitroxide decay and nitroxide side chain cleavage. In addition, we examine whether the lifetime of the nitroxide radical can be extended by use of an oxidizing agent...
March 13, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295909/optical-and-magnetic-properties-of-fe-nanoparticles-fabricated-by-fs-laser-ablation-in-organic-and-inorganic-solvents
#13
Jesica María José Santillán, David Muñeton Arboleda, Diego Coral, Marcela Fernández van Raap, Diego Muraca, Daniel Carlos Schinca, Lucía Beatriz Scaffardi
Magnetic nanoparticles have attracted much interest due to their broad applications in biomedical and pollutant remediation areas. In this paper, we study the optical, magnetic and structural characteristics of colloids produced by ultrashort pulsed laser ablation of a solid Fe target immersed in four different media: HPLC water, trisodium citrate aqueous solution, acetone and ethanol. Optical extinction spectroscopy reveals an absorption band in the UV region for all solvents except acetone, differing from what is obtained with ns lasers...
March 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28294502/the-role-of-anion-adsorption-in-the-effect-of-electrode-potential-on-spr-response
#14
Veronika K Laurinavichyute, Shavkat Nizamov, Vladimir M Mirsky
Surface plasmon resonance, being widely used in bioanalytics and biotechnology, is influenced by electrical potential of the resonant gold layer. To evaluate the mechanism of this effect, we have studied it in the solution of various inorganic electrolytes. The magnitude of the effect was decreased according to the series: KBr > KCl > KF > NaClO4. The data were treated using different models of the interface. Quantitative description was obtained for the model which takes into account local dielectric function of gold affected by free electron charge, diffuse ionic layer near gold / water interface and specific adsorption of halides to the gold surface with partial charge transfer...
March 11, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295951/c-1s-peak-of-adventitious-carbon-aligns-to-the-vacuum-level-dire-consequences-for-material-s-bonding-assignment-by-photoelectron-spectroscopy
#15
Grzegorz Greczynski, Lars Hultman
C 1s signal from ubiquitous carbon contamination on samples forming during air exposure, so called adventitious carbon (AdC) layers, is the most common binding energy (BE) reference in x-ray photoelectron spectroscopy studies. We demonstrate here, by using a series of transition metal nitride films with different AdC coverage, that the BE of C 1s peak E_B^F varies by as much as 1.44 eV. This is a factor of ten more than the typical resolvable difference between two chemical states of the same element, which makes BE referencing against the C 1s peak highly unreliable...
March 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28295928/rapid-acquisition-of-x-ray-scattering-data-from-droplet-encapsulated-protein-systems
#16
Oliva Saldanha, Rita Graceffa, Clement Hemonnot, Christiane Ranke, Gerrit Brehm, Marianne Liebi, Benedetta Marmiroli, Britta Weinhausen, Manfred Burghammer, Sarah Koester
Encapsulating reacting biological or chemical samples in microfluidic droplets has the great advantage over phase flows of providing separate reaction compartments. These compartments can be filled in a combinatoric way and prevent the sample from adsorbing to the channel walls. In recent years, small angle x-ray scattering (SAXS) in combination with microfluidics has evolved as a nanoscale method of such systems. Here, we approach two major challenges associated with combining droplet microfluidics and SAXS...
March 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28276618/giant-radiolytic-dissolution-rates-of-aqueous-ceria-observed-in-situ-by-liquid-cell-tem
#17
Muhammad Sajid Ali Asghar, Beverley J Inkson, Guenter Moebus
Dynamics of cerium oxide nanoparticle aqueous corrosion are revealed in-situ. We use innovative liquid-cell transmission electron microscopy (TEM) combined with deliberate high-intensity electron-beam irradiation of nanoparticle suspensions. This enables life video-recording of materials reactions in liquid, with nm-resolution. We introduce image-quantification to measure detailed rates of dissolution as a function of time and particle size to be compared with literature data. Giant dissolution rates, exceeding any previous reports for chemical dissolution rates at room temperature by many orders of magnitude, are discovered...
March 9, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28276181/unveiling-one-dimensional-supramolecular-structures-formed-through-%C3%AF-%C3%AF-stacking-of-phenothiazines-by-differential-pulse-voltammetry
#18
Fernando R Carvalho, Eduardo H Zampieri, Wilker Caetano, Rafael Silva
Organic based nanomaterials can be self-assembled by strong and directional intermolecular forces as π-π interactions are. Experimental information about the stability, size and geometry of those formed structures are very limited for species which easily aggregates even at very low concentration. Differential pulse voltammetry can unveil the formation, growth and also the stability window of ordered one-dimensional, lamellar, self-aggregates formed by supramolecular π stacking of phenothiazines at micromolar (10-6 mol·L-1) concentration...
March 9, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28272797/the-relation-between-vaporization-enthalpies-and-viscosities-eyring-s-theory-applied-to-selected-ionic-liquids
#19
Ralf Ludwig, Anne-Marie Bonsa, Dietmar Paschek, Dzmitry H Zaitsau, Vladimir N Emel'yanenko, Sergey P Verevkin
Key properties for the use of ionic liquids as electrolytes in batteries are low viscosities, low vapor pressure and high vaporization enthalpies. Whereas the measurement of transport properties is well established, the determination of vaporization enthalpies of these extremely low volatile compounds is still a challenge. At a first glance both properties seem to describe different thermophysical phenomena. However, eighty years ago Eyring suggested a theory which related viscosities and vaporization enthalpies to each other...
March 8, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28271606/extracting-crystal-chemistry-from-amorphous-carbon-structures
#20
Volker L Deringer, Gábor Csányi, Davide M Proserpio
Carbon allotropes have been explored intensively by ab initio crystal structure prediction, but such methods are limited by the large computational cost of the underlying density functional theory (DFT). Here we show that a novel class of machine-learning-based interatomic potentials can be used for random structure searching and readily predicts several hitherto unknown carbon allotropes. Remarkably, our model draws structural information from liquid and amorphous carbon exclusively, and so does not have any prior knowledge of crystalline phases: it therefore demonstrates true transferability, which is a crucial prerequisite for applications in chemistry...
March 8, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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