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https://www.readbyqxmd.com/read/28549332/synthesis-and-characterization-of-fullerene-modified-znalti-ldo-in-photo-degradation-of-bisphenol-a-under-simulated-visible-light-irradiation
#1
Liting Ju, Pingxiao Wu, Xiaolin Lai, Shanshan Yang, Beini Gong, Meiqing Chen, Nengwu Zhu
In this study, ZnAlTi layered double hydroxide (ZnAlTi-LDH) combined with fullerene (C60) was fabricated by the urea method, and calcined under vacuum atmosphere to obtain nanocomposites of C60-modified ZnAlTi layered double oxide (ZnAlTi-LDO). The morphology, structure and composition of the nanocomposites were analyzed by Scanning Electron Microscopy, High-resolution transmission electron microscopy, X-ray diffraction patterns, Fourier transform infrared and specific surface area. The UV-vis diffuse reflectance spectra indicated that the incorporation of C60 expanded the absorption of ZnAlTi-LDO to visible-light region...
May 23, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28548683/secondary-rim-%C3%AE-cyclodextrin-functionalization-to-conjugate-with-c60-improved-efficacy-as-photosensitizer
#2
Xiaolei Zhu, Annamaria Quaranta, René Bensasson, Matthieu Sollogoub, Yongmin Zhang
DIBAL-H-mediated demethylation provides a novel entry to secondary rim functionalized γ-CD. 2A,3B-dihydroxyl-per-O-methylated-γ-cyclodextrin has been obtained, whose conjugation with C60 allows the access to the most water-soluble C60 conjugate described so far. The water-solubility 0.12 M (550 mg/mL) is 150 times higher than that of native γ-CD/ C60 complex. Its singlet oxygen (¹O₂) quantum yield is 0.39, an increase by one or two orders of magnitude compared to that of α(β)CD-C60 conjugates.
May 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28548168/tuning-the-seebeck-effect-in-c60-based-hybrid-thermoelectric-devices-through-temperature-dependent-surface-polarization-and-thermally-modulated-interface-dipoles
#3
Yuchun Liu, Ling Xu, Chen Zhao, Ming Shao, Bin Hu
Fullerene (C60) is an important n-type organic semiconductor with high electron mobility and low thermal conductivity. In this work, we report the experimental results on the tunable Seebeck effect of C60 hybrid thin-film devices by adopting different oxide layers. After inserting n-type high-dielectric constant titanium oxide (TiOx) and zinc oxide (ZnO) layers, we observed a significantly enhanced n-type Seebeck effect in oxide/C60 hybrid devices with Seebeck coefficients of -5.8 mV K(-1) for TiOx/C60 and -2...
May 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28546887/energy-level-alignment-at-interfaces-between-manganese-phthalocyanine-and-c60
#4
Daniel Waas, Florian Rückerl, Martin Knupfer, Bernd Büchner
We have used photoelectron spectroscopy to determine the energy-level alignment at organic heterojunctions made of manganese phthalocyanine (MnPc) and the fullerene C60. We show that this energy-level alignment depends upon the preparation sequence, which is explained by different molecular orientations. Moreover, our results demonstrate that MnPc/C60 interfaces are hardly suited for application in organic photovoltaic devices, since the energy difference of the two lowest unoccupied molecular orbitals (LUMOs) is rather small...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28539233/supplementation-action-with-ascorbic-acid-in-the-morphology-of-the-muscular-layer-and-reactive-acetylcholinesterase-neurons-of-ileum-of-mdx-mice
#5
Marcelo José Santiago Lisboa, Marília Fabiana De Oliveira Lima, Sandra Regina Stabille, Jacqueline Nelisis Zanoni, Karina Martinez Gagliardo, Melyna Soares Souto, Renivaldo Souza, Jodonai Barbosa Da Silva, Sônia Regina De Almeida Yokomizo, Edson Aparecido Liberti, Naianne Kelly Clebis
The Duchenne Muscular Dystrophy (DMD) is a genetic disorder characterized by the absence of dystrophin protein, causing severe myopathy from increases of oxidative stress. Injuries of intestinal muscle can compromise the myenteric plexus. This study aimed to evaluate the disorders occurred in the muscular layer and in the acetylcholinesterase myenteric neurons (ACHE-r) of ileum of mdx mice, and the effects of supplementation with ascorbic acid (AA) in both components. 30 male mice C57BL/10, and 30 male mice C57BL/10Mdx were separated according to the age and treatment (n=10/group): 30-days-old control group (C30); 30-days-old dystrophic group (D30); 60-days-old control group (C60); 60-days-old dystrophic group (D60); 60-days-old control group supplemented with AA (CS60); and 60-days-old dystrophic group supplemented with AA (DS60)...
May 17, 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28537281/comprehensive-theoretical-study-of-all-1812-c60-isomers
#6
Rebecca Sure, Andreas Hansen, Peter Schwerdtfeger, Stefan Grimme
We investigate all 1812 isomers of the fullerene C60 consistently with high-accuracy quantum chemistry methods. The isomers are optimized at the PBE-D3/def2-TZVP level of theory and their relative energies are obtained at the affordable and accurate hybrid-DFT level PW6B95-D3(ATM)/def2-QZVP. For the first time reliable values for the relative energy distribution among the 1812 isomers (maximum value of 549.1 kcal mol(-1), average value of 189.8 ± 46.8 kcal mol(-1), 1267 isomers in an energy window of 150-250 kcal mol(-1)) are given...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28534056/carbon-nanomaterials-enhance-survival-of-agapanthus-praecox-callus-after-cryopreservation-by-vitrification
#7
S M Chen, L Ren, D Zhang, Y F Zhang, X H Shen
BACKGROUND: Adding exogenous compounds is an effective way to improve cell survival after cryopreservation. Carbon nanomaterials (CNMs) are novel exogenous substances with small particle size and good biocompatibility. OBJECTIVE: In this work, four types of CNMs were used for the cryopreservation of Agapanthus praecox callus and their possible effects and mechanism of action were analyzed. MATERIALS AND METHODS: The thermal properties of the vitrification solutions tested were detected by differential scanning calorimetry...
March 2017: Cryo Letters
https://www.readbyqxmd.com/read/28530273/single-photon-transient-hot-electron-ionization-of-c60
#8
K Hansen
Recent experiments have demonstrated that C60 can ionize in a thermal process after absorption of a photon with energy far above the ionization energy. This indirect ionization mechanism is investigated here by calculating the total and singly charged ion yields, electron energy distributions, and effective electronic temperatures as a function of photon energy.
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28527736/the-effects-of-non-invasive-radiofrequency-electric-field-hyperthermia-on-biotransport-and-biodistribution-of-fluorescent-60-fullerene-derivative-in-a-murine-orthotopic-model-of-breast-adenocarcinoma
#9
Norman A Lapin, Martyna Krzykawska-Serda, Sean Dilliard, Yuri Mackeyev, Maciej Serda, Lon J Wilson, Steven A Curley, Stuart J Corr
The aim of this study is to understand the combined and differential biokinetic effects of radiofrequency (RF) electric-field hyperthermia as an adjunctive therapy to [60]fullerene nanoparticle-based drug delivery systems in targeting the micro-vasculature and micro-environments of breast cancer tumors. Intravital microscopy (IVM) is an ideal tool to provide the spatial and temporal resolution needed for quantification in this investigation. The water-soluble and fluorescent [60]fullerene derivative (C60-serPF) was designed to be an amphiphilic nanostructure, which is able to cross several biological membranes and accumulate in tumor tissues by passing through abnormally leaky tumor blood vessels...
May 17, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28525394/modified-denatured-lysozyme-effectively-solubilizes-fullerene-c60-nanoparticles-in-water
#10
Marialuisa Siepi, Jane Politi, Principia Dardano, Angela Amoresano, Luca De Stefano, Daria Maria Monti, Eugenio Notomista
Fullerenes, allotropic forms of carbon, have very interesting pharmacological effects and engineering applications. However, a very low solubility both in organic solvents and water hinders their use. Fullerene C60, the most studied among fullerenes, can be dissolved in water only in the form of nanoparticles of variable dimensions and limited stability. Here the effect on the production of C60 nanoparticles by native and denatured hen egg white lysozyme, a highly basic protein, has been systematically studied...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28515662/tempo-functionalized-c60-fullerene-deposited-on-gold-surface-for-catalytic-oxidation-of-selected-alcohols
#11
Piotr Piotrowski, Joanna Pawłowska, Jarosław Grzegorz Sadło, Renata Bilewicz, Andrzej Kaim
C60TEMPO10 catalytic system linked to a microspherical gold support through a covalent S-Au bond was developed. The C60TEMPO10@Au composite catalyst had a particle size of 0.5-0.8 μm and was covered with the fullerenes derivative of 2.3 nm diameter bearing ten nitroxyl groups; the organic film showed up to 50 nm thickness. The catalytic composite allowed for the oxidation under mild conditions of various primary and secondary alcohols to the corresponding aldehyde and ketone analogues with efficiencies as high as 79-98%, thus giving values typical for homogeneous catalysis, while retaining at the same time all the advantages of heterogeneous catalysis, e...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28514167/quantum-dot-peptide-fullerene-bioconjugates-for-visualization-of-in-vitro-and-in-vivo-cellular-membrane-potential
#12
Okhil Kumar Nag, Michael H Stewart, Jeffrey R Deschamps, Kimihiro Susumu, Eunkeu Oh, Vassiliy Tsytsarev, Qinggong Tang, Alexander L Efros, Roman Vaxenburg, Bryan J Black, Yungchia Chen, Thomas J O'Shaughnessy, Stella H North, Lauren D Field, Philip E Dawson, Joseph J Pancrazio, Igor L Medintz, Yu Chen, Reha S Erzurumlu, Alan L Huston, James B Delehanty
We report the development of a quantum dot (QD)-peptide-fullerene (C60) electron transfer (ET)-based nanobioconjugate for the visualization of membrane potential in living cells. The bioconjugate is comprised of (1) a central QD electron donor, (2) a membrane-inserting peptidyl linker, and (3) a C60 electron acceptor. The photoexcited QD donor engages in ET with the C60 acceptor resulting in quenching of QD photoluminescence (PL) that tracks positively with the number of C60 moieties arrayed around the QD. The nature of the QD-capping ligand also modulates the quenching efficiency; a neutral ligand coating facilitates greater QD quenching than a negatively charged carboxylated ligand...
May 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28513712/charge-transport-in-c60-based-single-molecule-junctions-with-graphene-electrodes
#13
Susanne Leitherer, Pedro B Coto, Konrad Ullmann, Heiko B Weber, Michael Thoss
We investigate charge transport in C60-based single-molecule junctions with graphene electrodes employing a combination of density functional theory (DFT) electronic structure calculations and Landauer transport theory. In particular, the dependence of the transport properties on the conformation of the molecular bridge and the type of termination of the graphene electrodes is investigated. Furthermore, electron pathways through the junctions are analyzed using the theory of local currents. The results reveal, in agreement with previous experiments, a pronounced dependence of the transport properties on the bias polarity, which is rationalized in terms of the electronic structure of the molecule...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28511875/visible-light-switched-cytosol-release-of-sirna-by-amphiphilic-fullerene-derivative-to-enhance-rnai-efficacy-in-vitro-and-in-vivo
#14
Jing Wang, Lifei Xie, Tao Wang, Fengxin Wu, Jie Meng, Jian Liu, Haiyan Xu
Cationic macromolecules are attractive for use as small interfering RNA (siRNA) carriers due to their performance in non-immunological reactions, customization during synthesis, and low costs compared to viral carriers. However, their low transfection efficiency substantially hinders their application in both clinical practices and academic research, which is mostly attributable to the low capacity of siRNA/cationic macromolecule complexes to escape lysosomes. To address this challenge, we designed an amphiphilic fullerene derivative (C60-Dex-NH2) for efficient and controllable siRNA delivery...
May 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28510432/diels-alder-cycloaddition-of-cyclopentadiene-and-c60-at-the-extreme-high-pressure
#15
Tao Yang, Ryoichi Fukuda, Roberto Cammi, Masahiro Ehara
High-pressure Diels-Alder cycloaddition reaction of fullerenes is an important synthetic method for the thermally stable cycloadducts. The effects of high pressure on the potential energy surfaces of Diels-Alder cycloaddition of cyclopentadiene and C60 were studied with a recently developed approach, the polarizable continuum model for extreme pressure (XP-PCM). It is revealed that the high pressure reduces the activation energies and increases reaction energies drastically, making the DA reaction more favorable...
May 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28507390/high-quality-pvd-graphene-growth-by-fullerene-decomposition-on-cu-foils
#16
J Azpeitia, G Otero-Irurueta, I Palacio, J I Martinez, N Ruiz Del Árbol, G Santoro, A Gutiérrez, L Aballe, M Foerster, M Kalbac, V Vales, F J Mompeán, M García-Hernández, J A Martín-Gago, C Munuera, M F López
We present a new protocol to grow large-area, high-quality single-layer graphene on Cu foils at relatively low temperatures. We use C60 molecules evaporated in ultra high vacuum conditions as carbon source. This clean environment results in a strong reduction of oxygen-containing groups as depicted by X-ray photoelectron spectroscopy (XPS). Unzipping of C60 is thermally promoted by annealing the substrate at 800ºC during evaporation. The graphene layer extends over areas larger than the Cu crystallite size, although it is changing its orientation with respect to the surface in the wrinkles and grain boundaries, producing a modulated ring in the low energy electron diffraction (LEED) pattern...
August 2017: Carbon
https://www.readbyqxmd.com/read/28507160/emergent-magnetism-at-transition-metal-nanocarbon-interfaces
#17
Fatma Al Ma'Mari, Matthew Rogers, Shoug Alghamdi, Timothy Moorsom, Stephen Lee, Thomas Prokscha, Hubertus Luetkens, Manuel Valvidares, Gilberto Teobaldi, Machiel Flokstra, Rhea Stewart, Pierluigi Gargiani, Mannan Ali, Gavin Burnell, B J Hickey, Oscar Cespedes
Charge transfer at metallo-molecular interfaces may be used to design multifunctional hybrids with an emergent magnetization that may offer an eco-friendly and tunable alternative to conventional magnets and devices. Here, we investigate the origin of the magnetism arising at these interfaces by using different techniques to probe 3d and 5d metal films such as Sc, Mn, Cu, and Pt in contact with fullerenes and rf-sputtered carbon layers. These systems exhibit small anisotropy and coercivity together with a high Curie point...
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28505565/dft-and-td-dft-theoretical-studies-on-photo-induced-electron-transfer-process-on-cefamandole-c60-nano-complex
#18
Avat Arman Taherpour, Morteza Jamshidi, Omid Rezaei
The C60 fullerene displays a considerable electronegativity. It has a unique photophysical and electrochemical behavior that can be used as a suitable drug carrier. In the present study, the interaction of C60 fullerene as an electron recipient with the Cefamandole antibiotic was investigated in both ground and excited states using DFT and TD-DFT methods. The study of the interaction of C60 and Cefamandole via electron localization function (ELF) and reduced density gradient (RDG) revealed that the complex formation is of van der Waals type...
April 27, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28504413/-60-fullerene-based-macrocycle-ligands
#19
Liangbing Gan, Yanbang Li
Macrocycle ligands have three or more donor sites. Selective replacement of skeleton carbon atoms by heteroatoms and vacancies in C60 could lead to various macrocycle ligands with a cage-shaped backbone. Theoretical calculations indicate that such C60-based macrocycle ligands are as stable as C60 thermodynamically according to their similar HOMO-LUMO gaps. The synthesis of these ligands is a challenging task. Nevertheless important progresses have been reported. This concept article focuses on the structures of possible C60-based macrocycle ligands and related synthetic results...
May 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28498660/a-self-assembled-ruthenium-ii-porphyrin-aluminium-iii-porphyrin-fullerene-triad-for-long-lived-photoinduced-charge-separation
#20
Agnese Amati, Paolo Cavigli, Axel Kahnt, Maria Teresa Indelli, Elisabetta Iengo
A very efficient metal-mediated strategy led, in a single step, to a quantitative construction of a new three-component multi-chromophoric system containing one fullerene monoadduct, one aluminium(III) monopyridylporphyrin, and one ruthenium(II) tetraphenylporphyrin. The Al(III) monopyridylporphyrin component plays the pivotal role in directing the correct self-assembly process, and behaves as the antenna unit for the photoinduced processes of interest. A detailed study of the photophysical behavior of the triad was carried out in different solvents (DCM, THF, Toluene) by stationary and time-resolved emission and absorption spectroscopy in the pico- and nanosecond time domains...
May 12, 2017: Journal of Physical Chemistry. A
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