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Papers by zahra kachoei

Research paper thumbnail of Synthesis and Application of Poly(diallyldimethylammonium tribromide) as a Novel Polymeric Brominating Agent

Chinese Journal of Chemistry, Nov 1, 2010

In this study, the synthesis and applications of a new supported tribromide reagent based on poly... more In this study, the synthesis and applications of a new supported tribromide reagent based on poly(diallyldimethylammonium chloride) is reported. This supported tribromide is used in α-bromoacetalization of ketones, bromination of alkenes and regioselective bromination of activated aromatic compounds. This method is mild and no Br 2 and HBr were used. Other advantages of this reagent are stability, high efficiency, simple filterability and reusability.

Research paper thumbnail of Design and development of novel reactive amine nanocontainers for a self-healing epoxy adhesive: self-repairing investigation using the lap shear test

RSC Advances, 2015

Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amin... more Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amine nanocontainer.

Research paper thumbnail of Well-designed sandwich-like structured graphene/emeraldine salts prepared by inverse microemulsion polymerization with particle-on-sheet and sheet-on-sheet morphologies

Iranian Polymer Journal, Feb 24, 2015

Research paper thumbnail of Influence of Physical Dimension and Morphological-Dependent Antibacterial Characteristics of ZnO Nanoparticles Coated on Orthodontic NiTi Wires

BioMed Research International, Oct 14, 2021

White spot lesions (WSLs) are one of the adverse effects of fixed orthodontic treatments. They ar... more White spot lesions (WSLs) are one of the adverse effects of fixed orthodontic treatments. They are the primary sign of caries, which means inhibiting this process by antibacterial agents will reverse the procedure. The current study tested the surface modification of nickel-titanium (NiTi) wires with ZnO nanoparticles (NPs), as antimicrobial agents. As the morphology of NPs is one of the most critical factors for their properties, the antibacterial properties of different morphologies of ZnO nanostructures coated on the NiTi wire were investigated. For the preparation of ZnO nanostructures, five coating methods, including chemical vapor deposition (CVD), chemical precipitation method, polymer composite coating, sol-gel synthesis, and electrospinning process, were used. The antibacterial activity of NPs was assessed against Streptococcus mutans by the colony counting method. The obtained results showed that all the samples had antibacterial effects. The antibacterial properties of ZnO NPs were significantly improved when the specific surface area of particles increased, by the ZnO nanocrystals prepared via the CVD coating method.

Research paper thumbnail of Zinc-oxide nanocoating for improvement of the antibacterial and frictional behavior of nickel-titanium alloy

Nanomedicine, 2016

Aim: To fabricate a friction-reducing and antibacterial coating with zinc oxide (ZnO) nanoparticl... more Aim: To fabricate a friction-reducing and antibacterial coating with zinc oxide (ZnO) nanoparticles on nickel-titanium (NiTi) wire. Materials & methods: NiTi orthodontic wires were coated with ZnO nanoparticles using the chemical deposition method. Characteristics of the coating as well as the physical, mechanical and antibacterial properties of the wires were investigated. Results: A stable and well-adhered ZnO coating on the NiTi wires was obtained. The hardness and elastic modulus of the ZnO nanocoating were 2.3 ± 0.2 and 61.0 ± 3.6 GPa, respectively. The coated wires presented up to 21% reduction in the frictional forces and antibacterial activity against Streptococcus mutans. ZnO nanocoating significantly improved the surface quality of NiTi wires. The modulus of elasticity, unloading forces and austenite finish temperature were not significantly different after coating. Conclusion: This unique coating could be implemented into practice for safer and faster treatment to the ben...

Research paper thumbnail of Electrically Conductive Adhesives: From Fundamental to Recent Developments

Research paper thumbnail of Self Healing Materials Based on Nano Materials

Research paper thumbnail of Fabrication of Core-Shell Structured Graphene-Polyaniline Nanocomposites

Research paper thumbnail of Well-designed sandwich-like structured graphene/emeraldine salts prepared by inverse microemulsion polymerization with particle-on-sheet and sheet-on-sheet morphologies

Iranian Polymer Journal, 2015

Research paper thumbnail of Design and development of novel reactive amine nanocontainers for a self-healing epoxy adhesive: self-repairing investigation using the lap shear test

RSC Advances, 2015

Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amin... more Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amine nanocontainer.

Research paper thumbnail of Synthesis and Application of Poly(diallyldimethylammonium tribromide) as a Novel Polymeric Brominating Agent

Chinese Journal of Chemistry, Nov 1, 2010

In this study, the synthesis and applications of a new supported tribromide reagent based on poly... more In this study, the synthesis and applications of a new supported tribromide reagent based on poly(diallyldimethylammonium chloride) is reported. This supported tribromide is used in α-bromoacetalization of ketones, bromination of alkenes and regioselective bromination of activated aromatic compounds. This method is mild and no Br 2 and HBr were used. Other advantages of this reagent are stability, high efficiency, simple filterability and reusability.

Research paper thumbnail of Design and development of novel reactive amine nanocontainers for a self-healing epoxy adhesive: self-repairing investigation using the lap shear test

RSC Advances, 2015

Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amin... more Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amine nanocontainer.

Research paper thumbnail of Well-designed sandwich-like structured graphene/emeraldine salts prepared by inverse microemulsion polymerization with particle-on-sheet and sheet-on-sheet morphologies

Iranian Polymer Journal, Feb 24, 2015

Research paper thumbnail of Influence of Physical Dimension and Morphological-Dependent Antibacterial Characteristics of ZnO Nanoparticles Coated on Orthodontic NiTi Wires

BioMed Research International, Oct 14, 2021

White spot lesions (WSLs) are one of the adverse effects of fixed orthodontic treatments. They ar... more White spot lesions (WSLs) are one of the adverse effects of fixed orthodontic treatments. They are the primary sign of caries, which means inhibiting this process by antibacterial agents will reverse the procedure. The current study tested the surface modification of nickel-titanium (NiTi) wires with ZnO nanoparticles (NPs), as antimicrobial agents. As the morphology of NPs is one of the most critical factors for their properties, the antibacterial properties of different morphologies of ZnO nanostructures coated on the NiTi wire were investigated. For the preparation of ZnO nanostructures, five coating methods, including chemical vapor deposition (CVD), chemical precipitation method, polymer composite coating, sol-gel synthesis, and electrospinning process, were used. The antibacterial activity of NPs was assessed against Streptococcus mutans by the colony counting method. The obtained results showed that all the samples had antibacterial effects. The antibacterial properties of ZnO NPs were significantly improved when the specific surface area of particles increased, by the ZnO nanocrystals prepared via the CVD coating method.

Research paper thumbnail of Zinc-oxide nanocoating for improvement of the antibacterial and frictional behavior of nickel-titanium alloy

Nanomedicine, 2016

Aim: To fabricate a friction-reducing and antibacterial coating with zinc oxide (ZnO) nanoparticl... more Aim: To fabricate a friction-reducing and antibacterial coating with zinc oxide (ZnO) nanoparticles on nickel-titanium (NiTi) wire. Materials & methods: NiTi orthodontic wires were coated with ZnO nanoparticles using the chemical deposition method. Characteristics of the coating as well as the physical, mechanical and antibacterial properties of the wires were investigated. Results: A stable and well-adhered ZnO coating on the NiTi wires was obtained. The hardness and elastic modulus of the ZnO nanocoating were 2.3 ± 0.2 and 61.0 ± 3.6 GPa, respectively. The coated wires presented up to 21% reduction in the frictional forces and antibacterial activity against Streptococcus mutans. ZnO nanocoating significantly improved the surface quality of NiTi wires. The modulus of elasticity, unloading forces and austenite finish temperature were not significantly different after coating. Conclusion: This unique coating could be implemented into practice for safer and faster treatment to the ben...

Research paper thumbnail of Electrically Conductive Adhesives: From Fundamental to Recent Developments

Research paper thumbnail of Self Healing Materials Based on Nano Materials

Research paper thumbnail of Fabrication of Core-Shell Structured Graphene-Polyaniline Nanocomposites

Research paper thumbnail of Well-designed sandwich-like structured graphene/emeraldine salts prepared by inverse microemulsion polymerization with particle-on-sheet and sheet-on-sheet morphologies

Iranian Polymer Journal, 2015

Research paper thumbnail of Design and development of novel reactive amine nanocontainers for a self-healing epoxy adhesive: self-repairing investigation using the lap shear test

RSC Advances, 2015

Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amin... more Recovery of fracture toughness of a self-healing epoxy adhesive is achieved by using a novel amine nanocontainer.

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