The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Davoud Haghshenas Fatmehsari - One of the best experts on this subject based on the ideXlab platform.
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effect of AgNO3 addition rate on aspect ratio of cucl2 mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
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Effect of AgNO3 addition rate on aspect ratio of CuCl2–mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
Amirmostafa Amirjani - One of the best experts on this subject based on the ideXlab platform.
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effect of AgNO3 addition rate on aspect ratio of cucl2 mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
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Effect of AgNO3 addition rate on aspect ratio of CuCl2–mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
Pirooz Marashi - One of the best experts on this subject based on the ideXlab platform.
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effect of AgNO3 addition rate on aspect ratio of cucl2 mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
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Effect of AgNO3 addition rate on aspect ratio of CuCl2–mediated synthesized silver nanowires using response surface methodology
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2014Co-Authors: Amirmostafa Amirjani, Pirooz Marashi, Davoud Haghshenas FatmehsariAbstract:Abstract Nanomaterials have size-dependant properties which are important in their field of application. In this study response surface methodology (RSM) was successfully used to consider the effects of AgNO3 addition rate and Cl− concentration on the aspect ratio of silver nanowires synthesized via polyol method; the most commonly applied method for synthesizing metallic nanoparticles. Moreover, a suitable model for the relationship between the factors (AgNO3 addition rate and Cl− concentration) and the response (aspect ratio) was statistically developed. Based on the statistical analysis, it was shown that the first order of these two factors have the same significance on the aspect ratio of silver nanowires; while, the second order term of AgNO3 addition rate has a much higher effect on the response compared to Cl− concentration. Furthermore, the interaction between these two factors was statistically significant. It was found that when the concentration of Cl− is lower than 1.05 mM, the aspect ratio of formed silver nanowires is remarkably low regardless of AgNO3 addition rate in the studied range. Moreover, by the use of proposed second order polynomial model, the optimum values of the factors were estimated for obtaining nanowires with fairly high aspect ratio (∼100).
William P Unsworth - One of the best experts on this subject based on the ideXlab platform.
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silica supported silver nitrate as a highly active dearomatizing spirocyclization catalyst synergistic alkyne activation by silver nanoparticles and silica
Angewandte Chemie, 2016Co-Authors: Aimee K. Clarke, Michael J. James, Peter Obrien, Richard J K Taylor, William P UnsworthAbstract:Silica-supported AgNO3 (AgNO3–SiO2) catalyzes the dearomatizing spirocyclization of alkyne-tethered aromatics far more effectively than the analogous unsupported reagent; in many cases, reactions which fail using unsupported AgNO3 proceed effectively with AgNO3–SiO2. Mechanistic studies indicate that this is a consequence of silver nanoparticle formation on the silica surface combined with a synergistic effect caused by the silica support itself. The remarkable ease with which the reagent can be prepared and used is likely to be of much synthetic importance, in particular, by making nanoparticle catalysis more accessible to non-specialists.
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Silica‐Supported Silver Nitrate as a Highly Active Dearomatizing Spirocyclization Catalyst: Synergistic Alkyne Activation by Silver Nanoparticles and Silica
Angewandte Chemie, 2016Co-Authors: Aimee K. Clarke, Peter O'brien, Michael J. James, Richard J K Taylor, William P UnsworthAbstract:Silica-supported AgNO3 (AgNO3–SiO2) catalyzes the dearomatizing spirocyclization of alkyne-tethered aromatics far more effectively than the analogous unsupported reagent; in many cases, reactions which fail using unsupported AgNO3 proceed effectively with AgNO3–SiO2. Mechanistic studies indicate that this is a consequence of silver nanoparticle formation on the silica surface combined with a synergistic effect caused by the silica support itself. The remarkable ease with which the reagent can be prepared and used is likely to be of much synthetic importance, in particular, by making nanoparticle catalysis more accessible to non-specialists.
Jacques Rogez - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic modeling of the AgNO3–CsNO3–NaNO3 ternary system
Calphad, 2015Co-Authors: M.w. Manouan, Dalila Hellali, D. Boa, Hmida Zamali, Jacques RogezAbstract:By means of an optimization procedure, the AgNO3–CsNO3–NaNO3 ternary system has been assessed. The mixing enthalpies in the ternary system and the results derived from thermodynamic descriptions for the three limiting binary systems are used. For the AgNO3–NaNO3 and CsNO3–NaNO3 systems, optimized Gibbs energy expressions were taken from the literature. An assessment of the binary AgNO3–CsNO3 system based on the available experimental data is presented in this paper; the calculated phase diagram and thermodynamic functions agree well with experimental data. The parameters describing the Gibbs energies of all binary phases and the ternary liquid are used to predict the phase diagram of the AgNO3–CsNO3–NaNO3 system
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Experimental investigation and calculation of the binary (AgNO3 + KNO3) phase diagram
The Journal of Chemical Thermodynamics, 2015Co-Authors: D. Boa, Dalila Hellali, Hmida Zamali, D. Licbarski, M. Tizzotti, C. Favotto, P Benigni, Jacques RogezAbstract:The (AgNO3 + KNO3) phase diagram is reinvestigated using differential thermal analysis and X-ray diffraction. The system is characterized by a non-congruent equimolar compound AgK(NO3)2 with a polymorphic transition at T = 408.7 K. Three invariant reactions are distinguished: an eutectoid, an eutectic and a peritectic at T = (405.8, 407.8 and 415.9) K ±± 2 K respectively. The pure nitrates AgNO3 and KNO3 exhibit (solid + solid) phase transitions at T = (428.9 and 404.5 K respectively. There is a solid solution of KNO3 in ββ-AgNO3. In contrast, AgNO3 shows no significant solubility in solid KNO3. Combining our results with experimental data available in the literature, an optimization of the thermodynamic parameters in the binary system is performed. The calculated phase diagram and the thermodynamic functions agree well with the experimental data.
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Experimental study of phase equilibria in the (AgNO3+LiNO3+NaNO3) ternary system
Journal of Chemical Thermodynamics, 2013Co-Authors: Dalila Hellali, D. Boa, Hmida Zamali, Jacques RogezAbstract:Seven sections, in the ternary phase diagram (AgNO3 + LiNO3 + NaNO3) were studied at atmospheric pressure by means of differential thermal analysis (DTA) and differential scanning calorimetry (DSC): X(AgNO3) = 0.1 and 0.8, X(AgNO3)/X(LiNO3) = 3/2 and 2/3, X(LiNO3) = 0.2, and X(NaNO3) = 0.258 and 0.3. The results exhibit two invariant reactions: a eutectoid at T = 380 K and a eutectic at T = 440 K. (c) 2013 Elsevier Ltd. All rights reserved.
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Experimental study of phase equilibria in the (AgNO3 + LiNO3 + NaNO3) ternary system
The Journal of Chemical Thermodynamics, 2013Co-Authors: Dalila Hellali, D. Boa, Hmida Zamali, Jacques RogezAbstract:Abstract Seven sections, in the ternary phase diagram (AgNO3 + LiNO3 + NaNO3) were studied at atmospheric pressure by means of differential thermal analysis (DTA) and differential scanning calorimetry (DSC): X(AgNO3) = 0.1 and 0.8, X(AgNO3)/X(LiNO3) = 3/2 and 2/3, X(LiNO3) = 0.2, and X(NaNO3) = 0.258 and 0.3. The results exhibit two invariant reactions: a eutectoid at T = 380 K and a eutectic at T = 440 K.
