taha rostamzadeh - Academia.edu (original) (raw)

Papers by taha rostamzadeh

ACS applied energy materials, Nov 28, 2022

Angewandte Chemie, Mar 18, 2014

Komposit-Nanoschoten … … sind leicht über das Wachstum von Goldnanopartikeln im Inneren aufgeroll... more Komposit-Nanoschoten … … sind leicht über das Wachstum von Goldnanopartikeln im Inneren aufgerollter Nanoblätter oder teilweise gefüllter Fe 3 O 4-Hexaniobat-Nanoschoten erhältlich. In ihrer Zuschrift auf S. 4702 ff. berichten J. B. Wiley et al. über die Synthese und Charakterisierung solcher Gold-Hexaniobat-und Gold-Fe 3 O 4-Hexaniobat-Nanoschoten. Die optischen und magnetischen Eigenschaften der Komposite variieren mit ihrer Zusammensetzung.

Angewandte Chemie, Mar 18, 2014

ABSTRACT

Chemistry of Materials, 2015

Ag-containing vanadate nanopeapods (NPPs) have been prepared by two distinct approaches. In the f... more Ag-containing vanadate nanopeapods (NPPs) have been prepared by two distinct approaches. In the first, solvothermal methods utilizing 12-nm Ag nanoparticles (NPs) and vanadate nanosheets (NSs) lead to the formation of Ag NPPs where NPs are captured during the scrolling of NSs. High NP loadings are obtained with ∼40% of the NPPs ≥80% full. In the second approach, NPs and preformed nanoscrolls (NScs) are combined in toluene, and on slow evaporation of the solvent, NPs are drawn into the scrolls. This insertion approach produces much lower loadings with larger NP−NP interparticle distances. Surface plasmon resonance measurements on the series show a red shift in the NPPs relative to free Ag NPs with the solvothermally prepared NPPs exhibiting the greatest effect. Also of significance is that some vanadate NScs and NPPs demonstrate unusual asymmetric scrolling behavior; eccentric convolution occurs such that small and large interlayer spacings are realized on opposite sides of a scroll.

Advanced Materials Research, 2009

Mechanical alloying is one of the most successful methods for the manufacturing of metal matrix n... more Mechanical alloying is one of the most successful methods for the manufacturing of metal matrix nanocomposite powders. In this study, Al/SiC metal matrix composite (MMCp) powders with volume fractions of 5, 10, and 15 percent SiC were successfully obtained after milling the powder for a period of 25 hours at a ball to powder ratio of 15:1 using high energy planetary milling. The Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were conducted to investigate the lattice strain of the matrix phase and the microstructure of the nanocomposite powders after 1, 10, and 25 hours of milling time. Also, the morphology of the Al-5%SiC nanocomposite powder was investigated using transmission electron microscopy (TEM). The results show that with the increase of both milling time and the reinforcement phase volume fraction, the lattice strain increases and the average size of aluminum phase crystallites decreases. Eventually, after 25 hours of milling, the nanocomposite pow...

Advanced Materials Research, 2009

The object of the present work is the characterization of the corrosion behavior of Al-5%SiC nano... more The object of the present work is the characterization of the corrosion behavior of Al-5%SiC nanocomposites prepared by mechanical alloying and the hot pressing method. Al/SiC metal matrix composite (MMCp) powder with volume fraction of 5% SiC was synthesized by high-energy milling of the blended micro component powder. The mechanically mixed nanocomposite powder was consolidated into bulk compacts using hot pressing at 1 GPa pressure for thirty seconds at three different temperatures of 440, 480 and 520°C. The microstructure was investigated by Secondary electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The corrosion behavior of the coating was evaluated using electrochemical techniques such as potansiodynamic polarization and EIS. It was found that the corrosion resistance of Al-5%SiC nanocomposite when hot pressed at 480°C, in 3.5% NaCl solution was higher than pure Al and Al-SiC nanocomposite that had been hot pressed at other temperatures.

Angewandte Chemie International Edition, 2014

A facile in situ method to grow Au nanoparticles (NPs) in hexaniobate nanoscrolls is applied to t... more A facile in situ method to grow Au nanoparticles (NPs) in hexaniobate nanoscrolls is applied to the formation of plasmonic Au@hexaniobate and bifunctional plasmonic-magnetic Au-Fe 3 O 4 @hexaniobate nanopeapods (NPPs). Utilizing a solvothermal treatment, rigid multiwalled hexaniobate nanoscrolls and partially filled Fe 3 O 4 @hexaniobate NPPs were first fabricated. These nanostructures were then used as templates for the controlled in situ growth of Au NPs. The resulting peapod structures exhibited high filling fractions and longrange uniformity. Optical measurements showed a progressive red shift in plasmonic behavior between Au NPs, Au NPPs, and Au-Fe 3 O 4 NPPs; magnetic studies found that the addition of gold in the Fe 3 O 4 @hexaniobate NPPs reduced interparticle coupling effects. The development of this approach allows for the routine bulk preparation of noble-metal-containing bifunctional nanopeapod materials.

Langmuir, 2015

Synthetic methods are demonstrated that allow for the fabrication of Ag−hexaniobate nanocomposite... more Synthetic methods are demonstrated that allow for the fabrication of Ag−hexaniobate nanocomposites with directed nanoparticle (NP) placement and nanosheet morphological control. The solvothermal treatment of exfoliated nanosheets (NSs) in the presence of Ag NPs leads to a high yield of Ag nanocomposites. This approach is quite flexible and, with control of time and temperature, can be used to produce nanocomposites with specific architectures; Ag NPs can be attached to nanosheets, attached to the surfaces of nanoscrolls, or at higher temperatures, captured within nanoscrolls to form nanopeapod (NPP) structures. The decorated nanosheets and nanoscrolls show surface plasmon resonance (SPR) maxima similar to that of free Ag NPs, while the Ag NPPs exhibit a red shift of about 10 nm.

Wiley, for his excellent guidance, constant encouragement, and his belief in me. He has always be... more Wiley, for his excellent guidance, constant encouragement, and his belief in me. He has always been patient, thoughtful and extremely supportive. Professor Wiley, I do appreciate your always support, positive energy, understanding and all of your considerations and am so thankful and honored that I was able to join and spend several years of my lifespan in your research group doing research, learning, and gaining experiences. Thank you very much for everything. I would also like to thank my committee members, Professor Leszek Malkinski, Professor Steven Rick, and Professor Wellie Zhou for their helpful suggestions and ideas. I am, moreover, thankful of each and every member of Advanced Materials Research Institute, especially Poncho De Leon and Jennifer Noel Nguyen, as well as Department of Chemistry for their help and support during my course of studies. I would also like to thank my present and past group members for all their help and memories:

In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-e... more In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-energy planetary milling of Al and SiC powders for a period of 25 h at a ball-to-powder ratio of 15:1. The changes of the lattice strain, the crystallite size of the matrix phase, and the nanocomposite powder microstructure with time have been investigated by X-ray diffraction (XRD), X-ray mapping, and scanning electron microscopy (SEM) analyses. The morphologies of the nanocomposite powders obtained after 25 h of milling have also been studied by transmission electron microscopy (TEM). The results showed that nanocomposite powders were composed of near-spherical particles and, moreover, the SiC particles were uniformly distributed in the aluminum matrix.

In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-e... more In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-energy planetary milling of Al and SiC powders for a period of 25 h at a ball-to-powder ratio of 15:1. The changes of the lattice strain, the crystallite size of the matrix phase, and the nanocomposite powder microstructure with time have been investigated by X-ray diffraction (XRD), X-ray mapping, and scanning electron microscopy (SEM) analyses. The morphologies of the nanocomposite powders obtained after 25 h of milling have also been studied by transmission electron microscopy (TEM). The results showed that nanocomposite powders were composed of near-spherical particles and, moreover, the SiC particles were uniformly distributed in the aluminum matrix.

Langmuir : the ACS journal of surfaces and colloids, Jan 14, 2017

A rapid (≤2 min) and high-yield low-temperature synthesis has been developed for the in situ grow... more A rapid (≤2 min) and high-yield low-temperature synthesis has been developed for the in situ growth of gold nanoparticles (NPs) with controlled sizes in the interior of halloysite nanotubes (HNTs). A combination of HAuCl4 in ethanol/toluene, oleic acid, and oleylamine surfactants and ascorbic acid reducing agent with mild heating (55 °C) readily lead to the growth of targeted nanostructures. The sizes of Au NPs are tuned mainly by adjusting nucleation and growth rates. Further modification of the process, through an increase in ascorbic acid, allows for the formation of nanorods (NRs)/nanowires within the HNTs. This approach is not limited to gold-a modified version of this synthetic strategy can also be applied to the formation of Ag NPs and NRs within the clay nanotubes. The ability to readily grow such core-shell nanosystems is important to their further development as nanoreactors and active catalysts. NPs within the tube interior can further be manipulated by the electron beam....

Nanoscale, 2015

The rational design of monodisperse ferroelectric nanocrystals with controlled size and shape and... more The rational design of monodisperse ferroelectric nanocrystals with controlled size and shape and their organization into hierarchical structures has been a critical step for understanding the polar ordering in nanoscale ferroelectrics, as well as the design of nanocrystal-based functional materials which harness the properties of individual nanoparticles and the collective interactions between them. We report here on the synthesis and self-assembly of aggregate-free, single-crystalline titanium-based perovskite nanoparticles with controlled morphology and surface composition by using a simple, easily scalable and highly versatile colloidal route. Single-crystalline, non-aggregated BaTiO3 colloidal nanocrystals, used as a model system, have been prepared under solvothermal conditions at temperatures as low as 180 °C. The shape of the nanocrystals was tuned from spheroidal to cubic upon changing the polarity of the solvent, whereas their size was varied from 16 to 30 nm for spheres and 5 to 78 nm for cubes by changing the concentration of the precursors and the reaction time, respectively. The hydrophobic, oleic acid-passivated nanoparticles exhibit very good solubility in non-polar solvents and can be rendered dispersible in polar solvents by a simple process involving the oxidative cleavage of the double bond upon treating the nanopowders with the Lemieux-von Rudloff reagent. Lattice dynamic analysis indicated that regardless of their size, BaTiO3 nanocrystals present local disorder within the perovskite unit cell, associated with the existence of polar ordering. We also demonstrate for the first time that, in addition to being used for fabricating large area, crack-free, highly uniform films, BaTiO3 nanocubes can serve as building blocks for the design of 2D and 3D mesoscale structures, such as superlattices and superparticles. Interestingly, the type of superlattice structure (simple cubic or face centered cubic) appears to be determined by the type of solvent in which the nanocrystals were dispersed. This approach provides an excellent platform for the synthesis of other titanium-based perovskite colloidal nanocrystals with controlled chemical composition, surface structure and morphology and for their assembly into complex architectures, therefore opening the door for the design of novel mesoscale functional materials/nanocomposites with potential applications in energy conversion, data storage and the biomedical field.

ACS applied energy materials, Nov 28, 2022

Angewandte Chemie, Mar 18, 2014

Komposit-Nanoschoten … … sind leicht über das Wachstum von Goldnanopartikeln im Inneren aufgeroll... more Komposit-Nanoschoten … … sind leicht über das Wachstum von Goldnanopartikeln im Inneren aufgerollter Nanoblätter oder teilweise gefüllter Fe 3 O 4-Hexaniobat-Nanoschoten erhältlich. In ihrer Zuschrift auf S. 4702 ff. berichten J. B. Wiley et al. über die Synthese und Charakterisierung solcher Gold-Hexaniobat-und Gold-Fe 3 O 4-Hexaniobat-Nanoschoten. Die optischen und magnetischen Eigenschaften der Komposite variieren mit ihrer Zusammensetzung.

Angewandte Chemie, Mar 18, 2014

ABSTRACT

Chemistry of Materials, 2015

Ag-containing vanadate nanopeapods (NPPs) have been prepared by two distinct approaches. In the f... more Ag-containing vanadate nanopeapods (NPPs) have been prepared by two distinct approaches. In the first, solvothermal methods utilizing 12-nm Ag nanoparticles (NPs) and vanadate nanosheets (NSs) lead to the formation of Ag NPPs where NPs are captured during the scrolling of NSs. High NP loadings are obtained with ∼40% of the NPPs ≥80% full. In the second approach, NPs and preformed nanoscrolls (NScs) are combined in toluene, and on slow evaporation of the solvent, NPs are drawn into the scrolls. This insertion approach produces much lower loadings with larger NP−NP interparticle distances. Surface plasmon resonance measurements on the series show a red shift in the NPPs relative to free Ag NPs with the solvothermally prepared NPPs exhibiting the greatest effect. Also of significance is that some vanadate NScs and NPPs demonstrate unusual asymmetric scrolling behavior; eccentric convolution occurs such that small and large interlayer spacings are realized on opposite sides of a scroll.

Advanced Materials Research, 2009

Mechanical alloying is one of the most successful methods for the manufacturing of metal matrix n... more Mechanical alloying is one of the most successful methods for the manufacturing of metal matrix nanocomposite powders. In this study, Al/SiC metal matrix composite (MMCp) powders with volume fractions of 5, 10, and 15 percent SiC were successfully obtained after milling the powder for a period of 25 hours at a ball to powder ratio of 15:1 using high energy planetary milling. The Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses were conducted to investigate the lattice strain of the matrix phase and the microstructure of the nanocomposite powders after 1, 10, and 25 hours of milling time. Also, the morphology of the Al-5%SiC nanocomposite powder was investigated using transmission electron microscopy (TEM). The results show that with the increase of both milling time and the reinforcement phase volume fraction, the lattice strain increases and the average size of aluminum phase crystallites decreases. Eventually, after 25 hours of milling, the nanocomposite pow...

Advanced Materials Research, 2009

The object of the present work is the characterization of the corrosion behavior of Al-5%SiC nano... more The object of the present work is the characterization of the corrosion behavior of Al-5%SiC nanocomposites prepared by mechanical alloying and the hot pressing method. Al/SiC metal matrix composite (MMCp) powder with volume fraction of 5% SiC was synthesized by high-energy milling of the blended micro component powder. The mechanically mixed nanocomposite powder was consolidated into bulk compacts using hot pressing at 1 GPa pressure for thirty seconds at three different temperatures of 440, 480 and 520°C. The microstructure was investigated by Secondary electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The corrosion behavior of the coating was evaluated using electrochemical techniques such as potansiodynamic polarization and EIS. It was found that the corrosion resistance of Al-5%SiC nanocomposite when hot pressed at 480°C, in 3.5% NaCl solution was higher than pure Al and Al-SiC nanocomposite that had been hot pressed at other temperatures.

Angewandte Chemie International Edition, 2014

A facile in situ method to grow Au nanoparticles (NPs) in hexaniobate nanoscrolls is applied to t... more A facile in situ method to grow Au nanoparticles (NPs) in hexaniobate nanoscrolls is applied to the formation of plasmonic Au@hexaniobate and bifunctional plasmonic-magnetic Au-Fe 3 O 4 @hexaniobate nanopeapods (NPPs). Utilizing a solvothermal treatment, rigid multiwalled hexaniobate nanoscrolls and partially filled Fe 3 O 4 @hexaniobate NPPs were first fabricated. These nanostructures were then used as templates for the controlled in situ growth of Au NPs. The resulting peapod structures exhibited high filling fractions and longrange uniformity. Optical measurements showed a progressive red shift in plasmonic behavior between Au NPs, Au NPPs, and Au-Fe 3 O 4 NPPs; magnetic studies found that the addition of gold in the Fe 3 O 4 @hexaniobate NPPs reduced interparticle coupling effects. The development of this approach allows for the routine bulk preparation of noble-metal-containing bifunctional nanopeapod materials.

Langmuir, 2015

Synthetic methods are demonstrated that allow for the fabrication of Ag−hexaniobate nanocomposite... more Synthetic methods are demonstrated that allow for the fabrication of Ag−hexaniobate nanocomposites with directed nanoparticle (NP) placement and nanosheet morphological control. The solvothermal treatment of exfoliated nanosheets (NSs) in the presence of Ag NPs leads to a high yield of Ag nanocomposites. This approach is quite flexible and, with control of time and temperature, can be used to produce nanocomposites with specific architectures; Ag NPs can be attached to nanosheets, attached to the surfaces of nanoscrolls, or at higher temperatures, captured within nanoscrolls to form nanopeapod (NPP) structures. The decorated nanosheets and nanoscrolls show surface plasmon resonance (SPR) maxima similar to that of free Ag NPs, while the Ag NPPs exhibit a red shift of about 10 nm.

Wiley, for his excellent guidance, constant encouragement, and his belief in me. He has always be... more Wiley, for his excellent guidance, constant encouragement, and his belief in me. He has always been patient, thoughtful and extremely supportive. Professor Wiley, I do appreciate your always support, positive energy, understanding and all of your considerations and am so thankful and honored that I was able to join and spend several years of my lifespan in your research group doing research, learning, and gaining experiences. Thank you very much for everything. I would also like to thank my committee members, Professor Leszek Malkinski, Professor Steven Rick, and Professor Wellie Zhou for their helpful suggestions and ideas. I am, moreover, thankful of each and every member of Advanced Materials Research Institute, especially Poncho De Leon and Jennifer Noel Nguyen, as well as Department of Chemistry for their help and support during my course of studies. I would also like to thank my present and past group members for all their help and memories:

In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-e... more In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-energy planetary milling of Al and SiC powders for a period of 25 h at a ball-to-powder ratio of 15:1. The changes of the lattice strain, the crystallite size of the matrix phase, and the nanocomposite powder microstructure with time have been investigated by X-ray diffraction (XRD), X-ray mapping, and scanning electron microscopy (SEM) analyses. The morphologies of the nanocomposite powders obtained after 25 h of milling have also been studied by transmission electron microscopy (TEM). The results showed that nanocomposite powders were composed of near-spherical particles and, moreover, the SiC particles were uniformly distributed in the aluminum matrix.

In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-e... more In this study Al-5 (Vol) % SiC p nanocomposite powder has been successfully synthesized by high-energy planetary milling of Al and SiC powders for a period of 25 h at a ball-to-powder ratio of 15:1. The changes of the lattice strain, the crystallite size of the matrix phase, and the nanocomposite powder microstructure with time have been investigated by X-ray diffraction (XRD), X-ray mapping, and scanning electron microscopy (SEM) analyses. The morphologies of the nanocomposite powders obtained after 25 h of milling have also been studied by transmission electron microscopy (TEM). The results showed that nanocomposite powders were composed of near-spherical particles and, moreover, the SiC particles were uniformly distributed in the aluminum matrix.

Langmuir : the ACS journal of surfaces and colloids, Jan 14, 2017

A rapid (≤2 min) and high-yield low-temperature synthesis has been developed for the in situ grow... more A rapid (≤2 min) and high-yield low-temperature synthesis has been developed for the in situ growth of gold nanoparticles (NPs) with controlled sizes in the interior of halloysite nanotubes (HNTs). A combination of HAuCl4 in ethanol/toluene, oleic acid, and oleylamine surfactants and ascorbic acid reducing agent with mild heating (55 °C) readily lead to the growth of targeted nanostructures. The sizes of Au NPs are tuned mainly by adjusting nucleation and growth rates. Further modification of the process, through an increase in ascorbic acid, allows for the formation of nanorods (NRs)/nanowires within the HNTs. This approach is not limited to gold-a modified version of this synthetic strategy can also be applied to the formation of Ag NPs and NRs within the clay nanotubes. The ability to readily grow such core-shell nanosystems is important to their further development as nanoreactors and active catalysts. NPs within the tube interior can further be manipulated by the electron beam....

Nanoscale, 2015

The rational design of monodisperse ferroelectric nanocrystals with controlled size and shape and... more The rational design of monodisperse ferroelectric nanocrystals with controlled size and shape and their organization into hierarchical structures has been a critical step for understanding the polar ordering in nanoscale ferroelectrics, as well as the design of nanocrystal-based functional materials which harness the properties of individual nanoparticles and the collective interactions between them. We report here on the synthesis and self-assembly of aggregate-free, single-crystalline titanium-based perovskite nanoparticles with controlled morphology and surface composition by using a simple, easily scalable and highly versatile colloidal route. Single-crystalline, non-aggregated BaTiO3 colloidal nanocrystals, used as a model system, have been prepared under solvothermal conditions at temperatures as low as 180 °C. The shape of the nanocrystals was tuned from spheroidal to cubic upon changing the polarity of the solvent, whereas their size was varied from 16 to 30 nm for spheres and 5 to 78 nm for cubes by changing the concentration of the precursors and the reaction time, respectively. The hydrophobic, oleic acid-passivated nanoparticles exhibit very good solubility in non-polar solvents and can be rendered dispersible in polar solvents by a simple process involving the oxidative cleavage of the double bond upon treating the nanopowders with the Lemieux-von Rudloff reagent. Lattice dynamic analysis indicated that regardless of their size, BaTiO3 nanocrystals present local disorder within the perovskite unit cell, associated with the existence of polar ordering. We also demonstrate for the first time that, in addition to being used for fabricating large area, crack-free, highly uniform films, BaTiO3 nanocubes can serve as building blocks for the design of 2D and 3D mesoscale structures, such as superlattices and superparticles. Interestingly, the type of superlattice structure (simple cubic or face centered cubic) appears to be determined by the type of solvent in which the nanocrystals were dispersed. This approach provides an excellent platform for the synthesis of other titanium-based perovskite colloidal nanocrystals with controlled chemical composition, surface structure and morphology and for their assembly into complex architectures, therefore opening the door for the design of novel mesoscale functional materials/nanocomposites with potential applications in energy conversion, data storage and the biomedical field.