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https://www.readbyqxmd.com/read/28630331/distinguishing-attosecond-electron-electron-scattering-and-screening-in-transition-metals
#1
Cong Chen, Zhensheng Tao, Adra Carr, Piotr Matyba, Tibor Szilvási, Sebastian Emmerich, Martin Piecuch, Mark Keller, Dmitriy Zusin, Steffen Eich, Markus Rollinger, Wenjing You, Stefan Mathias, Uwe Thumm, Manos Mavrikakis, Martin Aeschlimann, Peter M Oppeneer, Henry Kapteyn, Margaret Murnane
Electron-electron interactions are the fastest processes in materials, occurring on femtosecond to attosecond timescales, depending on the electronic band structure of the material and the excitation energy. Such interactions can play a dominant role in light-induced processes such as nano-enhanced plasmonics and catalysis, light harvesting, or phase transitions. However, to date it has not been possible to experimentally distinguish fundamental electron interactions such as scattering and screening. Here, we use sequences of attosecond pulses to directly measure electron-electron interactions in different bands of different materials with both simple and complex Fermi surfaces...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28624746/textual-properties-and-catalytic-performances-of-halloysite-hybrid-ceo2-zro2-nanoparticles
#2
Jing Ouyang, Zai Zhao, Yi Zhang, Huaming Yang
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28574712/tracking-single-dna-nanodevices-in-hierarchically-meso-macroporous-antimony-doped-tin-oxide-demonstrates-finite-confinement
#3
Daniel G Mieritz, Xiang Li, Alex M Volosin, Minghui Liu, Hao Yan, Nils G Walter, Dong-Kyun Seo
Housing bio-nano guest devices based on DNA nanostructures within porous, conducting, inorganic host materials promise valuable applications in solar energy conversion, chemical catalysis and analyte sensing. Herein, we report a single-template synthetic development of hierarchically porous, transparent conductive metal oxide coatings whose pores are freely accessible by large biomacromolecules. Their hierarchal pore structure is bimodal with a larger number of closely-packed open macropores (~200 nm) at the higher rank and with the remaining space being filled with a gel network of antimony-doped tin oxide (ATO) nanoparticles that is highly porous with a broad size range of textual pores mainly from 20 - 100 nm at the lower rank...
June 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28567259/photothermal-enhanced-catalysis-in-core-shell-plasmonic-hierarchical-cu7s4-microsphere-zeolitic-imidazole-framework-8
#4
Feifan Wang, Yanjie Huang, Zhigang Chai, Min Zeng, Qi Li, Yuan Wang, Dongsheng Xu
Conventional semiconductor photocatalysis based on band-edge absorption remains inefficient due to the limited harvesting of solar irradiation and the complicated surface/interface chemistry. Herein, novel photothermal-enhanced catalysis was achieved in a core-shell hierarchical Cu7S4 nano-heater@ZIF-8 heterostructures via near-infrared localized surface plasmon resonance. Our results demonstrated that both the high surface temperature of the photothermal Cu7S4 core and the close-adjacency of catalytic ZIF-8 shell contributed to the extremely enhanced catalytic activity...
December 1, 2016: Chemical Science
https://www.readbyqxmd.com/read/28537615/constructing-three-dimensional-porous-ni-ni3s2-nano-interfaces-for-hydrogen-evolution-electrocatalysis-under-alkaline-conditions
#5
Yiming An, Bolong Huang, Zilong Wang, Xia Long, Yongcai Qiu, Jue Hu, Dan Zhou, He Lin, Shihe Yang
It is still a challenging issue to design earth-abundant electrocatalysts with low cost, high activity and long-term stability for the hydrogen evolution reaction (HER) based on water splitting in alkaline solutions. Here, we report a facile synthetic route for a three-dimensional, porous Ni/Ni3S2 nano-network on carbon cloth for the efficient catalysis of HER. This unique structure exposes a high proportion of Ni/Ni3S2 hetero-interfaces to the electrolyte, creating a synergetic effect between Ni and Ni3S2 that enhances HER...
May 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28500946/pa-tb-cu-mof-as-luminescent-nanoenzyme-for-catalytic-assay-of-hydrogen-peroxide
#6
Zewan Qi, Li Wang, Qi You, Yang Chen
Metal organic frameworks (MOFs) with flexible structures and components have aroused great interest in designing functional materials. In this work, we designed and made a kind of PA-Tb-Cu MOF nanoenzyme capable of emitting fluorescence for the catalytic reaction of hydrogen peroxide (H2O2). Luminescent Tb(3+), catalytic Cu(2+) and bridging ligand were assembled and integrated into a single material nanoenzyme. This PA-Tb-Cu MOF nanoenzyme not only possessed excellent catalytic activity comparable to horseradish peroxidase but also can real-time fluorescently indicate the concentration of H2O2 as low as 0...
May 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28447779/performance-and-mechanism-of-piezo-catalytic-degradation-of-4-chlorophenol-finding-of-effective-piezo-dechlorination
#7
Shenyu Lan, Jinxi Feng, Ya Xiong, Shuanghong Tian, Shengwei Liu, Lingjun Kong
Piezo-catalysis was first used to degrade a nondye pollutant, 4-chlorophenol (4-CP). In this process, hydrothermally synthesized tetragonal BaTiO3 nano/micrometer-sized particles were used as the piezo-catalyst, and the ultrasonic irradiation with low frequency was selected as the vibration energy to cause the deformation of tetragonal BaTiO3. It was found that the piezoelectric potential from the deformation could not only successfully degrade 4-chlorophenol but also effectively dechlorinate it at the same time, and five kinds of dechlorinated intermediates, hydroquinone, benzoquinone, phenol, cyclohexanone, and cyclohexanol, were determined...
June 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28443627/multifunctionality-of-silver-closo-boranes
#8
Mark Paskevicius, Bjarne R S Hansen, Mathias Jørgensen, Bo Richter, Torben R Jensen
Silver compounds share a rich history in technical applications including photography, catalysis, photocatalysis, cloud seeding and as antimicrobial agents. Here we present a class of silver compounds (Ag2B10H10 and Ag2B12H12) that are semiconductors with a bandgap at 2.3 eV in the green visible light spectrum. The silver boranes have extremely high ion conductivity and dynamic-anion facilitated Ag(+) migration is suggested based on the structural model. The ion conductivity is enhanced more than two orders of magnitude at room temperature (up to 3...
April 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28426059/evolution-of-dealloying-induced-strain-in-nanoporous-gold-crystals
#9
Yu-Chen Karen Chen-Wiegart, Ross Harder, David C Dunand, Ian McNulty
We studied the evolution of dealloying-induced strain along the {111} in a Ag-Au nano-crystal in situ, during formation of nanoporous gold at the initial stage of dealloying using Bragg coherent X-ray diffractive imaging. The strain magnitude with maximum probability in the crystal doubled in 10 s of dealloying. Although formation of nano-pores just began at the surface, the greatest strain is located 60-80 nm deep within the crystal. Dealloying induced a compressive strain in this region, indicating volume shrinkage occurred during pore formation...
May 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28395134/facile-fabrication-of-bcn-nanosheet-encapsulated-nano-iron-as-highly-stable-fischer-tropsch-synthesis-catalyst
#10
Jianghong Wu, Liancheng Wang, Baoliang Lv, Jiangang Chen
The few layered boron carbon nitride nanosheets (BCNNSs) have attracted widespread attention in the field of heterogeneous catalysis. Herein, we report an innovative one-pot route to prepare the catalyst of BCNNSs-encapsulated sub-10 nm highly dispersed nanoiron particles. Then the novel catalyst was used in Fischer-Tropsch synthesis for the first time and it exhibited high activity and superior stability. At a high temperature of 320 °C, CO conversion could reach 88.9%, corresponding catalytic activity per gram of iron (iron time yield, FTY) of 0...
April 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28394413/fast-operando-electron-nanotomography
#11
L Roiban, S Li, M Aouine, A Tuel, D Farrusseng, T Epicier
Electron tomography in transmission electron microscopy provides valuable three-dimensional structural, morphological and chemical information of condensed matter at nanoscale. Current image acquisitions require at least tens of minutes, which prohibits the analysis of nano-objects evolving rapidly such as under dynamic environmental conditions. Reducing the acquisition duration to tens of seconds or less permits to follow in 3D the same object during its evolution under varying temperatures and pressures. We report Operando Electron nanotomography using image series acquired in less than 230 seconds instead of typically 15 min in the best cases so far...
April 10, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28321609/the-cytotoxic-action-of-cytochrome-c-cardiolipin-nanocomplex-cyt-cl-on-cancer-cells-in-culture
#12
Yury A Vladimirov, Can Sarisozen, Georgy K Vladimirov, Nina Filipczak, Anastasia M Polimova, Vladimir P Torchilin
PURPOSE: The effect of existing anti-cancer therapies is based mainly on the stimulation of apoptosis in cancer cells. Here, we have demonstrated the ability of a catalytically-reactive nanoparticle-based complex of cytochrome c with cardiolipin (Cyt-CL) to induce the apoptosis and killing of cancer cells in a monolayer cell culture. METHODS: Cyt-CL nanoparticles were prepared by complexing CytC with different molar excesses of CL. Following characterization, cytotoxicity and apoptosis inducing effects of nanoparticles were investigated...
June 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28317225/chromium-0-molybdenum-0-and-tungsten-0-isocyanide-complexes-as-luminophores-and-photosensitizers-with-long-lived-excited-states
#13
REVIEW
Laura A Büldt, Oliver S Wenger
Arylisocyanide complexes based on earth-abundant Group 6 d(6) metals are interesting alternatives to photoactive complexes made from precious metals such as Ru(II) , Re(I) , Os(II) , or Ir(III) . Some of these complexes have long-lived (3) MLCT excited states that exhibit luminescence with good quantum yields as well as nano- to microsecond lifetimes, and they are very strongly reducing. Recent studies have demonstrated that Cr(0) , Mo(0) , and W(0) arylisocyanide complexes have great potential for applications in luminescent devices, photoredox catalysis, and dye-sensitized solar cells...
March 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28275962/formation-of-surface-nanodroplets-of-viscous-liquids-by-solvent-exchange
#14
Brendan Dyett, Haitao Yu, Xuehua Zhang
Surface nanodroplets are essential units for many compartmentalised processes from catalysis, liquid-liquid reactions, crystallization, wetting and more. Current techniques for producing submicron droplets are mainly based on top-down approaches, which are increasingly limited as scale reduces. Herein, solvent exchange is demonstrated as a simple solution-based approach for the formation of surface nanodroplets with intermediate and extremely high viscosity (1 000 000 cSt). By solvent exchange, the viscous droplet liquid dissolves in a good solvent that is then displaced by a poor solvent to yield surface droplets for the oversaturaion pulse at the mixing front...
March 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28256843/janus-gold-nanoparticles-from-nanodroplets-of-alkyl-thiols-a-molecular-dynamics-study
#15
Debdip Bhandary, Vasumathi Valechi, Maria Natália D S Cordeiro, Jayant K Singh
Janus particles provide an asymmetry in structure, which can impart diverse functionalities leading to immense importance in various applications, ranging from targeted delivery to interfacial phenomena, including catalysis, electronics, and optics. In this work, we present results of a molecular dynamics study of the growth mechanism of coating on gold nanoparticles (AuNPs) from droplets of n-alkyl thiols with different chain lengths (C5 and C11) and terminal groups (CH3 and COOH). The effect of chain lengths and functional groups on the formation of a monolayer of alkyl thiols on AuNPs is investigated...
March 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28256565/passion-fruit-like-nano-architectures-a-general-synthesis-route
#16
D Cassano, J David, S Luin, V Voliani
Noble metal nanostructures have demonstrated a number of intriguing features for both medicine and catalysis. However, accumulation issues have prevented their clinical translation, while their use in catalysis has shown serious efficiency and stability hurdles. Here we introduce a simple and robust synthetic protocol for passion fruit-like nano-architectures composed by a silica shell embedding polymeric arrays of ultrasmall noble metal nanoparticles. These nano-architectures show interesting features for both oncology and catalysis...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe-3-o-4-peg400-so-3-h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#17
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
June 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28203654/the-effect-of-varying-solvents-for-mos2-treatment-on-its-catalytic-efficiencies-for-her-and-orr
#18
Xing Juan Chua, Martin Pumera
MoS2 has been investigated intensively in the field of catalysis for the hydrogen evolution reaction (HER) in particular. Much effort has been made by various research teams worldwide to look into the specific catalyst design such as nano-structuring, defect engineering or hybrid structures. But what evades us is the fundamental preparation method for the dispersion of powdered MoS2. Individual research teams with their best practices might be subjective and not validated by extensive experimental results. In this report, we find that the overpotential for the catalysis of HER varies from 0...
February 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28195390/self-assembly%C3%A2-of%C3%A2-renewable%C3%A2-nano-sized-triterpenoids
#19
REVIEW
Braja Gopal Bag, Rakhi Majumdar
Studies on plant metabolites have gained renewed interest in recent years because these can serve as renewable chemicals for the development of a sustainable society.Among various plant secondary metabolites, terpenoids constitute the major component and triterpenoids are the 30C subset of it.In recent years, triterpenoids have drawn the attention of scientific community due to many of its potential and realized applications in medicine, drug delivery, thermochromic materials, pollutant capture, catalysis, liquid crystals, etc...
February 14, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28156099/shape-controllable-gold-nanoparticle-mos2-hybrids-prepared-by-tuning-edge-active-sites-and-surface-structures-of-mos2-via-temporally-shaped-femtosecond-pulses
#20
Pei Zuo, Lan Jiang, Xin Li, Bo Li, Yongda Xu, Xuesong Shi, Peng Ran, Tianbao Ma, Dawei Li, Liangti Qu, Yongfeng Lu, Costas P Grigoropoulos
Edge-active site control of MoS2 is crucial for applications such as chemical catalysis, synthesis of functional composites, and biochemical sensing. This work presents a novel nonthermal method to simultaneously tune surface chemical (edge-active sites) and physical (surface periodic micro/nano structures) properties of MoS2 using temporally shaped femtosecond pulses, through which shape-controlled gold nanoparticles are in situ and self-assembly grown on MoS2 surfaces to form Au-MoS2 hybrids. The edge-active sites with unbound sulfurs of laser-treated MoS2 drive the reduction of gold nanoparticles, while the surface periodic structures of laser-treated MoS2 assist the shape-controllable growth of gold nanoparticles...
March 1, 2017: ACS Applied Materials & Interfaces
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