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Delgado D, Sanchís R, Cecilia J, Rodríguez-Castellón E, Caballero A, Solsona B, Nieto JL. Support effects on NiO-based catalysts for the oxidative dehydrogenation (ODH) of ethane. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.07.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Boguslavsky Y, Shemesh M, Friedlander A, Rutenberg R, Filossof AM, Buslovich A, Poverenov E. Eliminating the Need for Biocidal Agents in Anti-Biofouling Polymers by Applying Grafted Nanosilica Instead. ACS OMEGA 2018; 3:12437-12445. [PMID: 31457975 PMCID: PMC6645711 DOI: 10.1021/acsomega.8b01438] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/22/2018] [Indexed: 05/07/2023]
Abstract
A nondestructive one-step approach was applied for grafting biocide-free monodispersed silica nanoparticles (SNPs) with a diameter of 30 ± 10 nm on polystyrene, polyethylene, and polyvinyl chloride surfaces. The prepared surfaces were comprehensively characterized using spectroscopic (Fourier transform infrared attenuated total reflection, ultraviolet-visible, and X-ray photoelectron spectroscopy) and microscopic (high-resolution scanning electron microscopy and atomic force microscopy) methods. The modified polymers were found to maintain their original mechanical and physical properties, while their nanoroughness on the other hand had risen by 1.6-2.7 times because of SNP grafting. The SNP-grafted surfaces displayed anti-biofouling properties, resulting in a significant reduction in the attached Gram-positive Bacillus licheniformis or Gram-negative Pseudomonas aeruginosa bacteria compared to their nongrafted counterparts. Confocal laser scanning microscopy and scanning electron microscopy studies have confirmed that bacterial cells could not successfully adhere onto the SNP-grafted polymer films regardless of the polymer type, and their biofilm formation was therefore damaged. The presented facile and straightforward protocol allows eliminating the need for biocidal agents and resorts to grafted nanosilica instead. This strategy may serve as a feasible and safe platform for the development of sustainable anti-biofouling surfaces in biomedical devices; food, water, and air treatment systems; and industrial equipment.
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Affiliation(s)
- Yonit Boguslavsky
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Moshe Shemesh
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Alon Friedlander
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Biofilm
Research Laboratory, Hadassah School of Dental Medicine, The Hebrew University, POB 12272, Jerusalem 91120, Israel
| | - Roi Rutenberg
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Institute
of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty
of Agriculture, Food and Environment, The
Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Anat Molad Filossof
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
| | - Aviva Buslovich
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
- Department
of Chemistry, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Elena Poverenov
- Department
of Food Quality and Safety, Agricultural
Research Organization, The Volcani Center, Rishon LeZion 75288, Israel
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Külah E, Marot L, Steiner R, Romanyuk A, Jung TA, Wäckerlin A, Meyer E. Surface chemistry of rare-earth oxide surfaces at ambient conditions: reactions with water and hydrocarbons. Sci Rep 2017; 7:43369. [PMID: 28327642 PMCID: PMC5361147 DOI: 10.1038/srep43369] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 01/23/2017] [Indexed: 11/12/2022] Open
Abstract
Rare-earth (RE) oxide surfaces are of significant importance for catalysis and were recently reported to possess intrinsic hydrophobicity. The surface chemistry of these oxides in the low temperature regime, however, remains to a large extent unexplored. The reactions occurring at RE surfaces at room temperature (RT) in real air environment, in particular, in presence of polycyclic aromatic hydrocarbons (PAHs), were not addressed until now. Discovering these reactions would shed light onto intermediate steps occurring in automotive exhaust catalysts before reaching the final high operational temperature and full conversion of organics. Here we first address physical properties of the RE oxide, nitride and fluoride surfaces modified by exposure to ambient air and then we report a room temperature reaction between PAH and RE oxide surfaces, exemplified by tetracene (C18H12) on a Gd2O3. Our study evidences a novel effect – oxidation of higher hydrocarbons at significantly lower temperatures (~300 K) than previously reported (>500 K). The evolution of the surface chemical composition of RE compounds in ambient air is investigated and correlated with the surface wetting. Our surprising results reveal the complex behavior of RE surfaces and motivate follow-up studies of reactions between PAH and catalytic surfaces at the single molecule level.
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Affiliation(s)
- Elçin Külah
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Laurent Marot
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Roland Steiner
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Andriy Romanyuk
- Glas Trösch AG, Industriestrasse 29, 4922 Bützberg, Switzerland
| | - Thomas A Jung
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Aneliia Wäckerlin
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.,Laboratory for Thin Films and Photovoltaics, Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Ernst Meyer
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
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Rhenium electroless deposition on p-Si(100) from HF solutions under illumination: Hydrogen evolution reaction onto p-Si/Re systems. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Suzer S, Dâna A. X-ray Photoemission for Probing Charging/Discharging Dynamics. J Phys Chem B 2006; 110:19112-5. [PMID: 17004757 DOI: 10.1021/jp0644006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel technique is introduced for probing charging/discharging dynamics of dielectric materials in which X-ray photoemission data is recorded while the sample rod is subjected to +/-10.0 V square-wave pulses with varying frequencies in the range of 10(-3) to 10(3) Hz. For a clean silicon sample, the Si2p(Si(0)) peak appears at correspondingly -10.0 eV and +10.0 eV binding energy positions (20.0 eV difference) with no frequency dependence. However, the corresponding peak of the oxide (Si(4+)) appears with less than 20.0 eV difference and exhibits a strong frequency dependence due to charging of the oxide layer, which is faithfully reproduced by a theoretical model. In the simplest application of this technique, we show that the two O1s components can be assigned to SiO(x) and TiO(y) moeties by correlating their dynamical shifts to those of the Si2p and Ti2p peaks in a composite sample. Our pulsing technique turns the powerful X-ray photoemission into an even more powerful impedance spectrometer with an added advantage of chemical resolution and specificity.
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Karadas F, Ertas G, Ozkaraoglu E, Suzer S. X-ray-induced production of gold nanoparticles on a SiO(2)/Si system and in a poly(methyl methacrylate) matrix. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:437-442. [PMID: 15620336 DOI: 10.1021/la0478604] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Prolonged exposure to X-rays of HAuCl(4) deposited from an aqueous solution onto a SiO(2)/Si substrate or into a poly(methyl methacrylate) (PMMA) matrix induces reduction of the Au(3+) ions to Au(0) and subsequent nucleation to gold nanoclusters as recorded by X-ray photoelectron spectroscopy. The corresponding major oxidation product is determined as chlorine {HAuCl(4)(ads) + X-rays --> Au(ads) + (3/2)Cl(2)(ads) + HCl(ads)}, which is initially adsorbed onto the surface but eventually diffuses out of the system into the vacuum. The reduced gold atoms aggregate (three-dimensionally) into gold nanoclusters as evidenced by the variation in the binding energy during X-ray exposure, which starts as 1.3 eV but approaches a value that is 0.5 eV higher than that of the bulk gold. The disappearance of the oxidation product (Cl2p signal) and the growth of the nanoclusters (related to the measured binding energy difference between the Si2p of the oxide and Au4f of the reduced gold) exhibit first-order kinetics which is approximately 3 times slower than the reduction of Au(3+), indicating that both of the former processes are diffusion controlled. Similarly, gold ions incorporated into PMMA can also be reduced and aggregated to gold nanoclusters using 254 nm deep UV irradiation in air evidenced by UV-vis-NIR absorption spectrocopy.
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Affiliation(s)
- Ferdi Karadas
- Bilkent University, Department of Chemistry, 06800 Ankara, Turkey
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Martin F, Lopez MC, Carrera P, Ramos-Barrado JR, Leinen D. XPS depth profile study of porous zirconia films deposited on stainless steel by spray pyrolysis: the problem of substrate corrosion. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1637] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Turner NH, Schreifels JA. Surface Analysis: X-ray Photoelectron Spectroscopy and Auger Electron Spectroscopy. Anal Chem 1996. [DOI: 10.1021/a19600146] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Noel H. Turner
- Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375-5342
| | - John A. Schreifels
- Department of Chemistry, George Mason University, Fairfax, Virginia 22030
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