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Danchuk V, Shatalov M, Zinigrad M, Kossenko A, Brider T, Le L, Johnson D, Strzhemechny YM, Musin A. Nanocrystalline Cubic Phase Scandium-Stabilized Zirconia Thin Films. Nanomaterials (Basel) 2024; 14:708. [PMID: 38668202 DOI: 10.3390/nano14080708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/11/2024] [Accepted: 04/15/2024] [Indexed: 04/29/2024]
Abstract
The cubic zirconia (ZrO2) is attractive for a broad range of applications. However, at room temperature, the cubic phase needs to be stabilized. The most studied stabilization method is the addition of the oxides of trivalent metals, such as Sc2O3. Another method is the stabilization of the cubic phase in nanostructures-nanopowders or nanocrystallites of pure zirconia. We studied the relationship between the size factor and the dopant concentration range for the formation and stabilization of the cubic phase in scandium-stabilized zirconia (ScSZ) films. The thin films of (ZrO2)1-x(Sc2O3)x, with x from 0 to 0.2, were deposited on room-temperature substrates by reactive direct current magnetron co-sputtering. The crystal structure of films with an average crystallite size of 85 Å was cubic at Sc2O3 content from 6.5 to 17.5 mol%, which is much broader than the range of 8-12 mol.% of the conventional deposition methods. The sputtering of ScSZ films on hot substrates resulted in a doubling of crystallite size and a decrease in the cubic phase range to 7.4-11 mol% of Sc2O3 content. This confirmed that the size of crystallites is one of the determining factors for expanding the concentration range for forming and stabilizing the cubic phase of ScSZ films.
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Affiliation(s)
- Victor Danchuk
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 40700, Israel
- CEITEC BUT, Brno University of Technology, 61200 Brno, Czech Republic
| | - Mykola Shatalov
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 40700, Israel
- Raicol Crystals Ltd., Rosh Ha'Ayin 4809162, Israel
| | - Michael Zinigrad
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 40700, Israel
| | - Alexey Kossenko
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 40700, Israel
| | - Tamara Brider
- Technology and Engineering Unit, Electronic Microscopy Lab, Ariel University, Ariel 40700, Israel
| | - Luc Le
- Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX 76109, USA
| | - Dustin Johnson
- Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX 76109, USA
| | - Yuri M Strzhemechny
- Department of Physics and Astronomy, Texas Christian University, Fort Worth, TX 76109, USA
| | - Albina Musin
- Physics Department, Faculty of Natural Sciences, Ariel University, Ariel 40700, Israel
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Rubtsov S, Musin A, Danchuk V, Shatalov M, Prasad N, Zinigrad M, Yadgarov L. Plasmon-Enhanced Perovskite Solar Cells Based on Inkjet-Printed Au Nanoparticles Embedded into TiO 2 Microdot Arrays. Nanomaterials (Basel) 2023; 13:2675. [PMID: 37836316 PMCID: PMC10574114 DOI: 10.3390/nano13192675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/22/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023]
Abstract
The exceptional property of plasmonic materials to localize light into sub-wavelength regimes has significant importance in various applications, especially in photovoltaics. In this study, we report the localized surface plasmon-enhanced perovskite solar cell (PSC) performance of plasmonic gold nanoparticles (AuNPs) embedded into a titanium oxide (TiO2) microdot array (MDA), which was deposited using the inkjet printing technique. The X-ray (XRD) analysis of MAPI (methyl ammonium lead iodide) perovskite films deposited on glass substrates with and without MDA revealed no destructive effect of MDA on the perovskite structure. Moreover, a 12% increase in the crystallite size of perovskite with MDA was registered. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) techniques revealed the morphology of the TiO2_MDA and TiO2-AuNPs_MDA. The finite-difference time-domain (FDTD) simulation was employed to evaluate the absorption cross-sections and local field enhancement of AuNPs in the TiO2 and TiO2/MAPI surrounding media. Reflectance UV-Vis spectra of the samples comprising glass/TiO2 ETL/TiO2_MDA (ETL-an electron transport layer) with and without AuNPs in TiO2_MDA were studied, and the band gap (Eg) values of MAPI have been calculated using the Kubelka-Munk equation. The MDA introduction did not influence the band gap value, which remained at ~1.6 eV for all the samples. The photovoltaic performance of the fabricated PSC with and without MDA and the corresponding key parameters of the solar cells have also been studied and discussed in detail. The findings indicated a significant power conversion efficiency improvement of over 47% in the PSCs with the introduction of the TiO2-AuNPs_MDA on the ETL/MAPI interface compared to the reference device. Our study demonstrates the significant enhancement achieved in halide PSC by utilizing AuNPs within a TiO2_MDA. This approach holds great promise for advancing the efficiency and performance of photovoltaic devices.
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Affiliation(s)
- Sofia Rubtsov
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
| | - Albina Musin
- Physics Department, Faculty of Natural Sciences, Ariel University, Ariel 4076414, Israel;
| | - Viktor Danchuk
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
| | - Mykola Shatalov
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
| | - Neena Prasad
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
| | - Michael Zinigrad
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
| | - Lena Yadgarov
- Department of Chemical Engineering, Biotechnology and Materials, Faculty of Engineering, Ariel University, Ariel 4076414, Israel; (S.R.); (V.D.); (M.S.); (N.P.); (M.Z.)
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Immanuel PN, Huang SJ, Danchuk V, Sedova A, Prilusky J, Goldreich A, Shalom H, Musin A, Yadgarov L. Improving the Stability of Halide Perovskite Solar Cells Using Nanoparticles of Tungsten Disulfide. Nanomaterials (Basel) 2022; 12:4454. [PMID: 36558307 PMCID: PMC9784750 DOI: 10.3390/nano12244454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Halide perovskites-based solar cells are drawing significant attention due to their high efficiency, versatility, and affordable processing. Hence, halide perovskite solar cells have great potential to be commercialized. However, the halide perovskites (HPs) are not stable in an ambient environment. Thus, the instability of the perovskite is an essential issue that needs to be addressed to allow its rapid commercialization. In this work, WS2 nanoparticles (NPs) are successfully implemented on methylammonium lead iodide (MAPbI3) based halide perovskite solar cells. The main role of the WS2 NPs in the halide perovskite solar cells is as stabilizing agent. Here the WS2 NPs act as heat dissipater and charge transfer channels, thus allowing an effective charge separation. The electron extraction by the WS2 NPs from the adjacent MAPbI3 is efficient and results in a higher current density. In addition, the structural analysis of the MAPbI3 films indicates that the WS2 NPs act as nucleation sites, thus promoting the formation of larger grains of MAPbI3. Remarkably, the absorption and shelf life of the MAPbI3 layers have increased by 1.7 and 4.5-fold, respectively. Our results demonstrate a significant improvement in stability and solar cell characteristics. This paves the way for the long-term stabilization of HPs solar cells by the implementation of WS2 NPs.
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Affiliation(s)
- Philip Nathaniel Immanuel
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Song-Jeng Huang
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
| | - Viktor Danchuk
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Anastasiya Sedova
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Johnathan Prilusky
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Achiad Goldreich
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Hila Shalom
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
| | - Albina Musin
- Physics Department, Faculty of Natural Sciences, Ariel University, Ariel 4076414, Israel
| | - Lena Yadgarov
- Department of Chemical Engineering, Faculty of Engineering, Ariel University, Ariel 4076414, Israel
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Frenkel M, Multanen V, Grynyov R, Musin A, Bormashenko Y, Bormashenko E. Author Correction: Camphor-Engine-Driven Micro-Boat Guides Evolution of Chemical Gardens. Sci Rep 2019; 9:4673. [PMID: 30858402 PMCID: PMC6411971 DOI: 10.1038/s41598-019-39974-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Musin A, Grynyov R, Frenkel M, Bormashenko E. Self-propulsion of a metallic superoleophobic micro-boat. J Colloid Interface Sci 2016; 479:182-188. [DOI: 10.1016/j.jcis.2016.06.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 06/26/2016] [Accepted: 06/28/2016] [Indexed: 11/16/2022]
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Grynyov R, Bormashenko E, Whyman G, Bormashenko Y, Musin A, Pogreb R, Starostin A, Valtsifer V, Strelnikov V, Schechter A, Kolagatla S. Superoleophobic Surfaces Obtained via Hierarchical Metallic Meshes. Langmuir 2016; 32:4134-4140. [PMID: 27077637 DOI: 10.1021/acs.langmuir.6b00248] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Hierarchical metallic surfaces demonstrating pronounced water and oil repellence are reported. The surfaces were manufactured with stainless-steel microporous meshes, which were etched with perfluorononanoic acid. As a result, a hierarchical relief was created, characterized by roughness at micro- and sub-microscales. Pronounced superoleophobicity was registered with regard to canola, castor, sesame, flax, crude (petroleum), and engine oils. Relatively high sliding angles were recorded for 5 μL turpentine, olive, and silicone oil droplets. The stability of the Cassie-like air trapping wetting state, established with water/ethanol solutions, is reported. The omniphobicity of the surfaces is due to the interplay of their hierarchical relief and surface fluorination.
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Affiliation(s)
| | | | | | | | | | | | - Anton Starostin
- Institute of Technical Chemistry, Ural Division, Russian Academy of Science , ulitsa Academika Koroleva 3, Perm 614013, Russia
| | - Viktor Valtsifer
- Institute of Technical Chemistry, Ural Division, Russian Academy of Science , ulitsa Academika Koroleva 3, Perm 614013, Russia
| | - Vladimir Strelnikov
- Institute of Technical Chemistry, Ural Division, Russian Academy of Science , ulitsa Academika Koroleva 3, Perm 614013, Russia
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Kovaleva L, Musin A. NUMERICAL MODELING OF HEAVY HYDROCARBON LIQUID HEATING. Braz J Chem Eng 2016. [DOI: 10.1590/0104-6632.20160331s20140101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- L. Kovaleva
- Bashkir State University, Russia; Bashkir State University, Russia
| | - A. Musin
- Bashkir State University, Russia; Bashkir State University, Russia
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Bormashenko E, Musin A, Whyman G, Barkay Z, Zinigrad M. On universality of scaling law describing roughness of triple line. Eur Phys J E Soft Matter 2015; 38:2. [PMID: 25618613 DOI: 10.1140/epje/i2015-15002-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 07/22/2014] [Accepted: 01/12/2015] [Indexed: 06/04/2023]
Abstract
The fine structure of the three-phase (triple) line was studied for different liquids, various topographies of micro-rough substrates and various wetting regimes. Wetting of porous and pillar-based micro-scaled polymer surfaces was investigated. The triple line was visualized with the environmental scanning electron microscope and scanning electron microscope for the "frozen" triple lines. The value of the roughness exponent ζ for water (ice)/rough polymer systems was located within 0.55-0.63. For epoxy glue/rough polymer systems somewhat lower values of the exponent, 0.42 < ζ < 0.54, were established. The obtained values of ζ were close for the Cassie and Wenzel wetting regimes, different liquids, and different substrates' topographies. Thus, the above values of the exponent are to a great extent universal. The switch of the exponent, when the roughness size approaches to the correlation length of the defects, is also universal.
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Affiliation(s)
- Edward Bormashenko
- Department of Physics, Ariel University, P.O.B. 3, 40700, Ariel, Israel,
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Abstract
The paper is devoted to the analysis of the shape of the swash edge line. Formation of the swash boundary is treated as an interfacial phenomenon. The simplest quantitative characteristic of the roughness of interface is its width w, defined as the root-mean-square fluctuation around the average position. For rough interfaces, the scaling with size of the system L is observed in the form w(L)∝ L(ζ). The concept of scaling supplies a simple framework for classifying interfaces. It is suggested that the fine structure of the swash boundary results from the combined action of the pinning force applied by random defects of the beach and elasticity of distorted swash boundary. The roughness of the swash front was studied at the Mediterranean Sea coast for uprush and backwash flows. Value of exponent ζ for receding swash front line was 0.64 ± 0.02, when in the case of advancing swash the value 0.73 ± 0.03 was calculated. The scaling exponent established for the receding phase of the swash is very close to the values of the exponent established for the roughness of the triple line for water droplets deposited on rough surfaces, crack propagation front in Plexiglas, and for the motion of a magnetic domain walls.
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Affiliation(s)
- E. Bormashenko
- Department of Physics, Ariel University, P.O.B. 3, Ariel 40700, Israel
- Department of Chemical Engineering and Biotechnology, Ariel University, P.O.B. 3, Ariel 40700, Israel
| | - A. Musin
- Department of Physics, Ariel University, P.O.B. 3, Ariel 40700, Israel
- Department of Chemical Engineering and Biotechnology, Ariel University, P.O.B. 3, Ariel 40700, Israel
| | - R. Grynyov
- Department of Physics, Ariel University, P.O.B. 3, Ariel 40700, Israel
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Abstract
The fine structure of the triple line for water droplets deposited on porous polymer substrates was investigated. Substrates were obtained with the breath-figures self-assembly. Water droplets demonstrated the pronounced Cassie-Baxter wetting regime. The triple line was imaged with environmental scanning electron microscopy. The roughness of a triple line was characterized with its averaged root-mean-square (rms) width w(L), and its scaling experimental dependence upon the length L of the triple line w(L) is proportional to L(ζ) was analyzed. The values of exponents in the range of 0.60-063 were established. The deduced values of ζ evidence the local nature of the triple-line elasticity and support the idea that the elastic potential of the triple line includes only even powers of the displacement.
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Affiliation(s)
- E Bormashenko
- Department of Physics, and ‡Department of Chemical Engineering and Biotechnology, Ariel University , Post Office Box 3, Ariel 40700, Israel
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Abstract
Physical mechanisms of Cassie-Wenzel wetting transitions are discussed. The origin of the potential barrier separating the Cassie and Wenzel wetting states is clarified. It may contain contributions originating from the filling of hydrophobic pores and displacement of the triple line along the smooth portions of the relief. One- and two-dimensional scenarios of wetting transitions are considered. We demonstrate that the contribution to the potential barrier because of the displacement of the triple line is not negligible in both cases.
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Affiliation(s)
- E Bormashenko
- Department of Physics, Ariel University Center of Samaria, Post Office Box 3, Ariel 40700, Israel.
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Bormashenko E, Pogreb R, Musin A. Stable water and glycerol marbles immersed in organic liquids: From liquid marbles to Pickering-like emulsions. J Colloid Interface Sci 2012; 366:196-199. [DOI: 10.1016/j.jcis.2011.09.048] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2011] [Revised: 08/25/2011] [Accepted: 09/19/2011] [Indexed: 10/17/2022]
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Bormashenko E, Musin A, Pogreb R, Luz E, Zinigrad M. Thickness of gravity-flattened water layers (“puddles”) deposited on the polymer substrates and the hysteresis of the contact angle. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bormashenko E, Pogreb R, Whyman G, Musin A, Bormashenko Y, Barkay Z. Shape, vibrations, and effective surface tension of water marbles. Langmuir 2009; 25:1893-1896. [PMID: 19152257 DOI: 10.1021/la8028484] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The surface of water "marbles" obtained with hydrophobic lycopodium and polyvinylidene fluoride particles was investigated first with environmental scanning electron microscopy. The shape of water marbles was studied both experimentally and theoretically. The mathematical model describing the deformation of marbles by gravity is proposed. The model allowed the calculation of the effective surface tension of marbles and gives 0.09 J/m2 for marbles coated with PVDF and 0.06 J/m2 for marbles coated with lycopodium. The effective surface tensions of marbles calculated independently by the horizontal vibration of marbles were in semiquantitative agreement with the above values (0.07 J/m2 for marbles coated with PVDF and 0.055 J/m2 for marbles coated with lycopodium).
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Affiliation(s)
- Edward Bormashenko
- Ariel University Center of Samaria, The Research Institute, Ariel 40700, Israel.
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Bormashenko E, Pogreb R, Bormashenko Y, Musin A, Stein T. New investigations on ferrofluidics: ferrofluidic marbles and magnetic-field-driven drops on superhydrophobic surfaces. Langmuir 2008; 24:12119-12122. [PMID: 18837530 DOI: 10.1021/la802355y] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The motion of ferrofluidic marbles on flat polymer substrates is reported. Nanopowders of polyvinylidene fluoride and gammaFe2O3 were used for the preparation of ferrofluidic marbles. The marbles are activated easily with an external magnetic field. A microfluidic device based on ferrofluidic marbles (the ferrofluidic bearing) is described. Velocities of marbles as high as 25+/-3 cm/s were registered. The sliding of ferrofluidic drops on superhydrophobic surfaces was studied. It was demonstrated that the threshold magnetic force necessary for the drop displacement depends linearly on the drop radius, thus the motion of the drop is defined by the processes occurring in the vicinity of the triple line only.
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Affiliation(s)
- Edward Bormashenko
- Ariel University Center of Samaria, The Research Institute, Ariel, Israel.
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Bormashenko E, Malkin A, Musin A, Bormashenko Y, Whyman G, Litvak N, Barkay Z, Machavariani V. Mesoscopic Patterning in Evaporated Polymer Solutions: Poly(ethylene glycol) and Room-Temperature-Vulcanized Polyorganosilanes/-siloxanes Promote Formation of Honeycomb Structures. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bormashenko E, Bormashenko Y, Whyman G, Pogreb R, Musin A, Jager R, Barkay Z. Contact angle hysteresis on polymer substrates established with various experimental techniques, its interpretation, and quantitative characterization. Langmuir 2008; 24:4020-4025. [PMID: 18302442 DOI: 10.1021/la703875b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The effect of contact angle hysteresis (CAH) was studied on various polymer substrates with traditional and new experimental techniques. The new experimental technique presented in the article is based on the slow deformation of the droplet, thus CAH is studied under the constant volume of the drop in contrast to existing techniques when the volume of the drop is changed under the measurement. The energy of hysteresis was calculated in the framework of the improved Extrand approach. The advancing contact angle established with a new technique is in a good agreement with that measured with the needle-syringe method. The receding angles measured with three experimental techniques demonstrated a very significant discrepancy. The force pinning the triple line responsible for hysteresis was calculated.
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Affiliation(s)
- Edward Bormashenko
- Ariel University Center of Samaria, The Research Institute, Ariel, Israel.
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Bormashenko E, Malkin A, Musin A, Bormashenko Y, Whyman G, Litvak N, Barkay Z, Machavariani V. Macromol. Chem. Phys. 6/2008. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200890008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Bormashenko E, Malkin A, Musin A, Bormashenko Y, Whyman G, Litvak N, Barkay Z, Machavariani V. Mesoscopic Patterning in Evaporated Polymer Solutions: Poly(ethylene glycol) and Room-Temperature-Vulcanized Polyorganosilanes/-siloxanes Promote Formation of Honeycomb Structures. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200700552] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bormashenko E, Pogreb R, Stein T, Whyman G, Erlich M, Musin A, Machavariani V, Aurbach D. Characterization of rough surfaces with vibrated drops. Phys Chem Chem Phys 2008; 10:4056-61. [DOI: 10.1039/b800091c] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bormashenko E, Musin A, Pogreb R, Bormashenko Y, Gendelman O. Self-assembled patterns obtained with evaporated polymer solutions and pre-stretched polymer substrates. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.04.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Diaz G, Melis M, Musin A, Piludu M, Piras M, Falchi AM. Localization of MTT formazan in lipid droplets. An alternative hypothesis about the nature of formazan granules and aggregates. Eur J Histochem 2007; 51:213-218. [PMID: 17921117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023] Open
Abstract
MTT (3-(4, 5-dimethyl-2-thiazolyl)-2, 5-dihphenyltetrazolium bromide) assay is a widely used method to assess cell viability and proliferation. MTT is readily taken up by cells and enzymatically reduced to formazan, a dark compound which accumulates in cytoplasmic granules. Formazan is later eliminated by the cell by a mechanisms often indicated as exocytosis, that produces characteristic needle-like aggregates on the cell surface. The shape of formazan aggregates and the rate of exocytosis change in the presence of bioactive amyloid beta peptides (Abeta) and cholesterol. Though the cellular mechanisms involved in MTT reduction have been extensively investigated, the exact nature of formazan granules and the process of exocytosis are still obscure. Using Nile Red, which stains differentially neutral and polar lipids, and a fluorescent analog of cholesterol (NBD-cholesterol), we found that formazan localized in lipid droplets, consistent with the lipophilic nature of formazan. However, formazan granules and aggregates were also found to form after killing cells with paraformaldehyde fixation. Moreover, formazan aggregates were also obtained in cell-free media, using ascorbic acid to reduce MTT. The density and shape of formazan aggregates obtained in cell-free media was sensitive to cholesterol and Abeta. In cells, electron microscopy failed to detect the presence of secretory vesicles, but revealed unusual fibers of 50 nm of diameter extending throughout the cytoplasm. Taken together, these findings suggest that formazan efflux is driven by physico-chemical interactions at molecular level without involving higher cytological mechanisms.
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Affiliation(s)
- Giacomo Diaz
- Dipartimento di Citomorfologia, Università di Cagliari, Italy.
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Bormashenko E, Musin A, Bormashenko Y, Whyman G, Pogreb R, Gendelman O. Formation of Films on Water Droplets Floating on a Polymer Solution Surface. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200600485] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Bormashenko E, Pogreb R, Musin A, Stanevsky O, Bormashenko Y, Whyman G, Barkay Z. Patterning in rapidly evaporated polymer solutions: Formation of annular structures under evaporation of the poor solvent. J Colloid Interface Sci 2006; 300:293-7. [PMID: 16626728 DOI: 10.1016/j.jcis.2006.03.064] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2006] [Revised: 03/15/2006] [Accepted: 03/27/2006] [Indexed: 11/22/2022]
Abstract
Patterning in the intensively evaporated polymer solutions based on polystyrene and poor solvent (acetone) was investigated. SEM and AFM studies demonstrated that annular elements of the surface topography are formed in this case, in contrast to the honeycomb patterns obtained under the evaporation of the good solvent (chloroform). The authors suggest that the theory of viscous dewetting developed by de Gennes explains the phenomenon satisfactorily.
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Affiliation(s)
- Edward Bormashenko
- The Research Institute, The College of Judea and Samaria, 44837 Ariel, Israel.
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Pogreb R, Popov O, Lirtsman V, Pyshkin O, Kazachkov A, Musin A, Whyman G, Finkelshtein B, Shmukler Y, Davidov D, Gladkikh A, Bormashenko E. Luminescent properties of PP and LDPE films and rods doped with the Eu(III)-La(III) complex. POLYM ADVAN TECHNOL 2006. [DOI: 10.1002/pat.680] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bormashenko E, Pogreb R, Musin A, Stanevsky O, Bormashenko Y, Whyman G, Gendelman O, Barkay Z. Self-assembly in evaporated polymer solutions: influence of the solution concentration. J Colloid Interface Sci 2005; 297:534-40. [PMID: 16364355 DOI: 10.1016/j.jcis.2005.11.025] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2005] [Revised: 11/09/2005] [Accepted: 11/11/2005] [Indexed: 11/18/2022]
Abstract
Amorphous polymers were dissolved in chlorinated organic solvents and deposited on thin horizontal substrates. The solutions with various concentrations of polymers were deposited and evaporated under ambient conditions in a slow air current. Self-assembled oriented mesoscopically scaled patterns were observed. The patterns were studied with optical and atomic force microscopy. The concentration of the solution exerts a decisive influence on the mesoscopic cell characteristic dimension. Cell dimensions grow linearly with the polymer solution concentration for all kinds of tested polymers, chlorinated solvents and substrates. The dependence could be explained by a physical mechanism, based on the mass transport instability occurring under the intensive evaporation of the solvent. In situ FTIR study of the process was performed first. It was established with FTIR spectroscopy that film porosity is not due to water droplet condensation under evaporation.
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Affiliation(s)
- Edward Bormashenko
- The College of Judea and Samaria, The Research Institute, 44837 Ariel, Israel.
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Abstract
Chronic obstructive pulmonary disease (COPD) is a condition characterized by progressive airflow limitation, which causes considerable morbidity and mortality worldwide. Yet the burden of COPD is poorly recognized, and the disease remains an inadequately managed health problem. Few studies have attempted to quantify the impact of the disease on patient health, the healthcare system and society as a whole. This provided the rationale for Confronting COPD in North America and Europe, the first large-scale international survey of the burden of COPD. This paper describes how quantitative measures of healthcare resource utilization and workplace productivity loss were derived from patient responses to the Confronting COPD survey, to investigate the country-specific impact of COPD on the healthcare system and society. The aim of this analysis is to inform countries of the economic impact of the condition, and demonstrate the need for better COPD treatment to improve health and reduce the sizeable burden of this disease.
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González-Enríquez J, Salvador-Llivina T, López-Nicolás A, Antón De Las Heras E, Musin A, Fernández E, García M, Schiaffino A, Pérez-Escolano I. [The effects of implementing a smoking cessation intervention in Spain on morbidity, mortality and health care costs]. Gac Sanit 2002; 16:308-17. [PMID: 12106550 DOI: 10.1016/s0213-9111(02)71929-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
OBJECTIVE We estimated the effect that a smoking cessation intervention in the Spanish population of smokers would have on smoking-related morbidity, mortality and health care costs. METHODS We adopted the model Health and Economic Consequences of Smoking sponsored by the WHO Health Organization and developed by the The Lewin Group. The smoking cessation intervention proposed includes pharmacological treatment to 35% of smokers who are trying to quit smoking and obtains a quit rate of 7.2%. The diseases studied are: lung cancer, heart disease, stroke, chronic obstructive pulmonary disease, asthma exacerbation, and low birth weight. The smoking-related cases of disease and of averted death and the reduction in health care expenditure due to the intervention were estimated. RESULTS Without intervention, at year 1 of the model, 2,136,094 smokers would be affected by some smoking-related disease; health care expenditure would be 4,286 million e and deaths attributable to smoking would total 26,537. The proposed intervention would prevent 2,613, 9,192, 17,415 and 23,837 cases of smoking-related disease at years 2, 5, 10 and 20 of the model, respectively. The saving in accumulated health care costs would amount to 3.5 million e at year 2 and 386 million e over 20 years. The accumulated prevented deaths are 284 at year 2 and 9,205 over 20 years. The intervention would save a total of 78,173 life-years by the end of the period considered. CONCLUSIONS The availability of new effective smoking cessation interventions and the increase in accessibility to such interventions may contribute significantly to reducing morbidity, mortality and health care costs associated with smoking in Spain.
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Affiliation(s)
- J González-Enríquez
- Agencia de Evaluación de Tecnologías Sanitarias, Instituto de Salud Carlos III, Madrid, Spain.
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