Ehsan Pipelzadeh - Academia.edu (original) (raw)

Papers by Ehsan Pipelzadeh

Research paper thumbnail of Design and Manufacturing of Desalination System Powered by Solar Energy Using CDI Technique

Bulletin of the American Physical Society, Nov 20, 2017

Research paper thumbnail of A new desalination technique using capacitive deionization

Bulletin of the American Physical Society, Nov 22, 2016

Research paper thumbnail of Nanocomposites for carbon dioxide photoreduction

Research paper thumbnail of Photoreduction of CO2 on ZIF-8/TiO2 nanocomposites in a gaseous photoreactor under pressure swing

Applied Catalysis B-environmental, Dec 1, 2017

Research paper thumbnail of Improving Mechanical Properties of Glass Fiber Reinforced Polymers through Silica-Based Surface Nanoengineering

ACS applied polymer materials, Jun 5, 2020

Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and tran... more Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and transport applications owing to their excellent strength-to-weight ratio. In GFRPs, mechanical properties are mainly governed by the filler-to-matrix interphase region, which need to be rationally designed and carefully engineered to optimize the composite performance. However, the structural and chemical parameters that optimize mechanical performance are partially unknown. Here we report on different surface nanoengineering strategies and their effect on the mechanical properties of GFRPs. Commercial woven glass fibers (wGFs) are modified with several distinct silica-based nanostructured coatings that provide different pore size, surface area and adhesion energy. To study their mechanical properties, epoxy-wGF laminated composites are manufactured and characterized using sliding contact, tensile and three-point bending tests. Composites based on coated wGFs generally show improved mechanical performance over those based on bare wGFs. In particular, wGFs coated with mesoporous silica films display the highest specific surface areas, pore sizes and adhesion energies, and provide the highest Young's and flexural modulus, with up to 31% improvement with respect to composites based on bare wGFs. The improvement of the composite's mechanical properties with the wGFs coating is related to a better stress distribution and a homogenous loading transfer at the polymer-GF interphase. Overall, this study provides insights on how GFRP's mechanical properties can be boosted beyond the current state-of-the-art by the rational design of its interphase.

Research paper thumbnail of Phenol decomposition under sunlight using a sonochemically synthesized CdSe/TiO2 nanocatalyst

Reaction Kinetics, Mechanisms and Catalysis, Jun 24, 2011

Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts ... more Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts for the photocatalytic degradation of phenol under solar light irradiation. The photocatalytic performance test was carried out using TiO2 as well as synthesized CdSe/TiO2 nanocatalysts. ...

Research paper thumbnail of Developing a CDI Desalination System on a Laboratory Scale Using Active Carbon Electrodes

Journal of Renewable Energy and Environment, Apr 1, 2019

Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensiv... more Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensive desalination process that has recently attracted experts' attention. The process is to explain that ions (cations and anions) can be separated by a pure electrostatic force imposed by a small bias potential. Even at a rather low voltage of 1.2 V, desalinated water can be produced. The process can be well operational by a professional cell design. Although various processes have been manufactured before, in this study, membrane was removed and a new unit was designed and manufactured (Using CFD Simulation). In this case, the combination of activated carbon powder (with an effective surface area of 2600 m 2 per gram), carbon black, and polyvinyl alcohol with a ratio of 35/35/30 coated on carbon paper as electrode materials was considered for tests. The weight was 1.41 grams for each material, and the thickness was 0.44 mm. CDI system was tested, and the results of charge-discharge cycles, cyclic voltammetry, and impedance spectroscopy were evaluated. It can be implied that there is no need for a strong pump and, also, pressure drop can be reduced due to such a noticeable space between two electrodes. Preliminary experimental results showed high specific capacitance (2.1 Farad) and ultra-high salt adsorption capacity, compared with similar cases.

Research paper thumbnail of Formic Acid Decomposition Using Synthesized Ag/TiO2 Nanocomposite in Ethanol-Water Media Under Illumination of Near UV Light

arXiv (Cornell University), Nov 21, 2018

Research paper thumbnail of Modeling and predicting of water production by capacitive deionization method using artificial neural networks

Research paper thumbnail of Design and Manufacturing of Desalination System Powered by Solar Energy Using CDI Technique

Bulletin of the American Physical Society, 2017

Research paper thumbnail of Developing a CDI Desalination System on a Laboratory Scale Using Active Carbon Electrodes

Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensiv... more Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensive desalination process that has recently attracted experts’ attention. The process is to explain that ions (cations and anions) can be separated by a pure electrostatic force imposed by a small bias potential. Even at a rather low voltage of 1.2 V, desalinated water can be produced. The process can be well operational by a professional cell design. Although various processes have been manufactured before, in this study, membrane was removed and a new unit was designed and manufactured (Using CFD Simulation). In this case, the combination of activated carbon powder (with an effective surface area of 2600 m2 per gram), carbon black, and polyvinyl alcohol with a ratio of 35/35/30 coated on carbon paper as electrode materials was considered for tests. The weight was 1.41 grams for each material, and the thickness was 0.44 mm. CDI system was tested, and the results of charge-discharge cycles,...

Research paper thumbnail of A new desalination technique using capacitive deionization

Bulletin of the American Physical Society, 2016

Research paper thumbnail of A Finite Element Investigation into the Cohesive Properties of Glass-Fiber-Reinforced Polymers with Nanostructured Interphases

Nanomaterials, 2021

Glass-fiber-reinforced polymer (GFRP) composites represent one of the most exploited composites d... more Glass-fiber-reinforced polymer (GFRP) composites represent one of the most exploited composites due to their outstanding mechanical properties, light weight and ease of manufacture. However, one of the main limitations of GFRP composites is their weak inter-laminar properties. This leads to resin delamination and loss of mechanical properties. Here, a model based on finite element analysis (FEA) is introduced to predict the collective advantage that a GF surface modification has on the inter-laminar properties in GFRP composites. The developed model is validated with experimental pull-out tests performed on different samples. As such, modifications were introduced using different surface coatings. Interfacial shear stress (IFSS) for each sample as a function of the GF to polymer interphase was evaluated. Adhesion energy was found by assimilating the collected data into the model. The FE model reported here is a time-efficient and low-cost tool for the precise design of novel filler ...

Research paper thumbnail of Improving Mechanical Properties of Glass Fiber Reinforced Polymers through Silica-Based Surface Nanoengineering

Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and tran... more Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and transport applications owing to their excellent strength-to-weight ratio. In GFRPs, mechanical properties are mainly governed by the filler-to-matrix interphase region, which need to be rationally designed and carefully engineered to optimize the composite performance. However, the structural and chemical parameters that optimize mechanical performance are partially unknown. Here we report on different surface nanoengineering strategies and their effect on the mechanical properties of GFRPs. Commercial woven glass fibers (wGFs) are modified with several distinct silica-based nanostructured coatings that provide different pore size, surface area and adhesion energy. To study their mechanical properties, epoxy-wGF laminated composites are manufactured and characterized using sliding contact, tensile and three-point bending tests. Composites based on coated wGFs generally show improved mechanical performance over those based on bare wGFs. In particular, wGFs coated with mesoporous silica films display the highest specific surface areas, pore sizes and adhesion energies, and provide the highest Young's and flexural modulus, with up to 31% improvement with respect to composites based on bare wGFs. The improvement of the composite's mechanical properties with the wGFs coating is related to a better stress distribution and a homogenous loading transfer at the polymer-GF interphase. Overall, this study provides insights on how GFRP's mechanical properties can be boosted beyond the current state-of-the-art by the rational design of its interphase.

Research paper thumbnail of Photoreduction of CO2 on ZIF-8/TiO2 nanocomposites in a gaseous photoreactor under pressure swing

Applied Catalysis B: Environmental, 2017

Research paper thumbnail of Photocatalytic Decomposition of Formic Acid Using the Synthesized Ag/TiO2 Nanocomposite

Research paper thumbnail of Phenol decomposition under sunlight using a sonochemically synthesized CdSe/TiO2 nanocatalyst

Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts ... more Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts for the photocatalytic degradation of phenol under solar light irradiation. The photocatalytic performance test was carried out using TiO2 as well as synthesized CdSe/TiO2 nanocatalysts. ...

Research paper thumbnail of Studies on the synthesis of α-Al2O3 nanopowders by the polyacrylamide gel method

Powder Technology, 2009

The polyacrylamide sol-gel method is a simple, fast and cheap method used for the synthesis of a ... more The polyacrylamide sol-gel method is a simple, fast and cheap method used for the synthesis of a wide variety of nanopowders. However, the effects of various experimental conditions on the nanopowders' properties have not been reported. In this paper, the effects of atmospheric conditions, heating rate, type of precursor, monomer-to-salt ratio and solution concentration on the structural properties of synthesized α-Al 2 O 3 nanopowder were investigated. The results show that better stabilized networks were obtained using two-stage atmospheres. Finer nanoparticles were obtained at lower heating rates as a result of delay in phase transformations. The type of precursor had no significant effect on particle size of the final product, as illustrated by scanning electron microscopy images, but it directly affected nanoparticle crystallization and thermal degradation of the polymeric network. In addition, there was an inverse relationship between the particle size and the ratio of monomer to the precursor salt. The decrease in particle size was due to higher thermal stability of the polymeric network. The concentration of the starting solution had no effect on the structure of the final product.

Research paper thumbnail of Silver doping on TiO2 nanoparticles using a sacrificial acid and its photocatalytic performance under medium pressure mercury UV lamp

Chemical Engineering Journal, 2009

Titanium dioxide nanoparticles were modified using a sacrificial organic acid carrier at low pH v... more Titanium dioxide nanoparticles were modified using a sacrificial organic acid carrier at low pH values where the zeta potential of the TiO 2 nanoparticles was found to be highly effective forming 0.05, 0.1, 0.5 wt.% Ag/TiO 2 nanocomposites. The organic carrier was acting both as an Ag ion carrier and a hole scavenger enhancing the photodeposition of Ag atoms. The formed nanocomposites were calcined at 300 and 400 • C under controlled atmosphere and later examined for photocatalytic performance using a 125 medium pressure mercury lamp decomposing formic acid as an organic pollutant. Morphological, crystallographical and UV-vis spectroscopy analyses were used to characterize the synthesized nanocomposites. The studies have revealed that non-calcined 0.5 wt.% Ag/TiO 2 nanocomposite has the best photocatalytic activity compared with other synthesized nanocomposites and that of the non-modified TiO 2 (P25). Further calcination of the synthesized nanocomposites has shown to be effective in lower Ag concentrations where 0.1 wt.% Ag/TiO 2 nanocomposite has the best photocatalytic activity at the 400 • C.

Research paper thumbnail of Design and Manufacturing of Desalination System Powered by Solar Energy Using CDI Technique

Bulletin of the American Physical Society, Nov 20, 2017

Research paper thumbnail of A new desalination technique using capacitive deionization

Bulletin of the American Physical Society, Nov 22, 2016

Research paper thumbnail of Nanocomposites for carbon dioxide photoreduction

Research paper thumbnail of Photoreduction of CO2 on ZIF-8/TiO2 nanocomposites in a gaseous photoreactor under pressure swing

Applied Catalysis B-environmental, Dec 1, 2017

Research paper thumbnail of Improving Mechanical Properties of Glass Fiber Reinforced Polymers through Silica-Based Surface Nanoengineering

ACS applied polymer materials, Jun 5, 2020

Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and tran... more Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and transport applications owing to their excellent strength-to-weight ratio. In GFRPs, mechanical properties are mainly governed by the filler-to-matrix interphase region, which need to be rationally designed and carefully engineered to optimize the composite performance. However, the structural and chemical parameters that optimize mechanical performance are partially unknown. Here we report on different surface nanoengineering strategies and their effect on the mechanical properties of GFRPs. Commercial woven glass fibers (wGFs) are modified with several distinct silica-based nanostructured coatings that provide different pore size, surface area and adhesion energy. To study their mechanical properties, epoxy-wGF laminated composites are manufactured and characterized using sliding contact, tensile and three-point bending tests. Composites based on coated wGFs generally show improved mechanical performance over those based on bare wGFs. In particular, wGFs coated with mesoporous silica films display the highest specific surface areas, pore sizes and adhesion energies, and provide the highest Young's and flexural modulus, with up to 31% improvement with respect to composites based on bare wGFs. The improvement of the composite's mechanical properties with the wGFs coating is related to a better stress distribution and a homogenous loading transfer at the polymer-GF interphase. Overall, this study provides insights on how GFRP's mechanical properties can be boosted beyond the current state-of-the-art by the rational design of its interphase.

Research paper thumbnail of Phenol decomposition under sunlight using a sonochemically synthesized CdSe/TiO2 nanocatalyst

Reaction Kinetics, Mechanisms and Catalysis, Jun 24, 2011

Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts ... more Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts for the photocatalytic degradation of phenol under solar light irradiation. The photocatalytic performance test was carried out using TiO2 as well as synthesized CdSe/TiO2 nanocatalysts. ...

Research paper thumbnail of Developing a CDI Desalination System on a Laboratory Scale Using Active Carbon Electrodes

Journal of Renewable Energy and Environment, Apr 1, 2019

Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensiv... more Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensive desalination process that has recently attracted experts' attention. The process is to explain that ions (cations and anions) can be separated by a pure electrostatic force imposed by a small bias potential. Even at a rather low voltage of 1.2 V, desalinated water can be produced. The process can be well operational by a professional cell design. Although various processes have been manufactured before, in this study, membrane was removed and a new unit was designed and manufactured (Using CFD Simulation). In this case, the combination of activated carbon powder (with an effective surface area of 2600 m 2 per gram), carbon black, and polyvinyl alcohol with a ratio of 35/35/30 coated on carbon paper as electrode materials was considered for tests. The weight was 1.41 grams for each material, and the thickness was 0.44 mm. CDI system was tested, and the results of charge-discharge cycles, cyclic voltammetry, and impedance spectroscopy were evaluated. It can be implied that there is no need for a strong pump and, also, pressure drop can be reduced due to such a noticeable space between two electrodes. Preliminary experimental results showed high specific capacitance (2.1 Farad) and ultra-high salt adsorption capacity, compared with similar cases.

Research paper thumbnail of Formic Acid Decomposition Using Synthesized Ag/TiO2 Nanocomposite in Ethanol-Water Media Under Illumination of Near UV Light

arXiv (Cornell University), Nov 21, 2018

Research paper thumbnail of Modeling and predicting of water production by capacitive deionization method using artificial neural networks

Research paper thumbnail of Design and Manufacturing of Desalination System Powered by Solar Energy Using CDI Technique

Bulletin of the American Physical Society, 2017

Research paper thumbnail of Developing a CDI Desalination System on a Laboratory Scale Using Active Carbon Electrodes

Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensiv... more Capacitive deionization (CDI) is an emerging energy efficient, low-pressure and low-cost intensive desalination process that has recently attracted experts’ attention. The process is to explain that ions (cations and anions) can be separated by a pure electrostatic force imposed by a small bias potential. Even at a rather low voltage of 1.2 V, desalinated water can be produced. The process can be well operational by a professional cell design. Although various processes have been manufactured before, in this study, membrane was removed and a new unit was designed and manufactured (Using CFD Simulation). In this case, the combination of activated carbon powder (with an effective surface area of 2600 m2 per gram), carbon black, and polyvinyl alcohol with a ratio of 35/35/30 coated on carbon paper as electrode materials was considered for tests. The weight was 1.41 grams for each material, and the thickness was 0.44 mm. CDI system was tested, and the results of charge-discharge cycles,...

Research paper thumbnail of A new desalination technique using capacitive deionization

Bulletin of the American Physical Society, 2016

Research paper thumbnail of A Finite Element Investigation into the Cohesive Properties of Glass-Fiber-Reinforced Polymers with Nanostructured Interphases

Nanomaterials, 2021

Glass-fiber-reinforced polymer (GFRP) composites represent one of the most exploited composites d... more Glass-fiber-reinforced polymer (GFRP) composites represent one of the most exploited composites due to their outstanding mechanical properties, light weight and ease of manufacture. However, one of the main limitations of GFRP composites is their weak inter-laminar properties. This leads to resin delamination and loss of mechanical properties. Here, a model based on finite element analysis (FEA) is introduced to predict the collective advantage that a GF surface modification has on the inter-laminar properties in GFRP composites. The developed model is validated with experimental pull-out tests performed on different samples. As such, modifications were introduced using different surface coatings. Interfacial shear stress (IFSS) for each sample as a function of the GF to polymer interphase was evaluated. Adhesion energy was found by assimilating the collected data into the model. The FE model reported here is a time-efficient and low-cost tool for the precise design of novel filler ...

Research paper thumbnail of Improving Mechanical Properties of Glass Fiber Reinforced Polymers through Silica-Based Surface Nanoengineering

Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and tran... more Glass fiber reinforced polymer (GFRP) composites are widely used materials in structural and transport applications owing to their excellent strength-to-weight ratio. In GFRPs, mechanical properties are mainly governed by the filler-to-matrix interphase region, which need to be rationally designed and carefully engineered to optimize the composite performance. However, the structural and chemical parameters that optimize mechanical performance are partially unknown. Here we report on different surface nanoengineering strategies and their effect on the mechanical properties of GFRPs. Commercial woven glass fibers (wGFs) are modified with several distinct silica-based nanostructured coatings that provide different pore size, surface area and adhesion energy. To study their mechanical properties, epoxy-wGF laminated composites are manufactured and characterized using sliding contact, tensile and three-point bending tests. Composites based on coated wGFs generally show improved mechanical performance over those based on bare wGFs. In particular, wGFs coated with mesoporous silica films display the highest specific surface areas, pore sizes and adhesion energies, and provide the highest Young's and flexural modulus, with up to 31% improvement with respect to composites based on bare wGFs. The improvement of the composite's mechanical properties with the wGFs coating is related to a better stress distribution and a homogenous loading transfer at the polymer-GF interphase. Overall, this study provides insights on how GFRP's mechanical properties can be boosted beyond the current state-of-the-art by the rational design of its interphase.

Research paper thumbnail of Photoreduction of CO2 on ZIF-8/TiO2 nanocomposites in a gaseous photoreactor under pressure swing

Applied Catalysis B: Environmental, 2017

Research paper thumbnail of Photocatalytic Decomposition of Formic Acid Using the Synthesized Ag/TiO2 Nanocomposite

Research paper thumbnail of Phenol decomposition under sunlight using a sonochemically synthesized CdSe/TiO2 nanocatalyst

Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts ... more Abstract Ultrasound energy has been successfully employed to synthesize CdSe/ TiO2 nanocatalysts for the photocatalytic degradation of phenol under solar light irradiation. The photocatalytic performance test was carried out using TiO2 as well as synthesized CdSe/TiO2 nanocatalysts. ...

Research paper thumbnail of Studies on the synthesis of α-Al2O3 nanopowders by the polyacrylamide gel method

Powder Technology, 2009

The polyacrylamide sol-gel method is a simple, fast and cheap method used for the synthesis of a ... more The polyacrylamide sol-gel method is a simple, fast and cheap method used for the synthesis of a wide variety of nanopowders. However, the effects of various experimental conditions on the nanopowders' properties have not been reported. In this paper, the effects of atmospheric conditions, heating rate, type of precursor, monomer-to-salt ratio and solution concentration on the structural properties of synthesized α-Al 2 O 3 nanopowder were investigated. The results show that better stabilized networks were obtained using two-stage atmospheres. Finer nanoparticles were obtained at lower heating rates as a result of delay in phase transformations. The type of precursor had no significant effect on particle size of the final product, as illustrated by scanning electron microscopy images, but it directly affected nanoparticle crystallization and thermal degradation of the polymeric network. In addition, there was an inverse relationship between the particle size and the ratio of monomer to the precursor salt. The decrease in particle size was due to higher thermal stability of the polymeric network. The concentration of the starting solution had no effect on the structure of the final product.

Research paper thumbnail of Silver doping on TiO2 nanoparticles using a sacrificial acid and its photocatalytic performance under medium pressure mercury UV lamp

Chemical Engineering Journal, 2009

Titanium dioxide nanoparticles were modified using a sacrificial organic acid carrier at low pH v... more Titanium dioxide nanoparticles were modified using a sacrificial organic acid carrier at low pH values where the zeta potential of the TiO 2 nanoparticles was found to be highly effective forming 0.05, 0.1, 0.5 wt.% Ag/TiO 2 nanocomposites. The organic carrier was acting both as an Ag ion carrier and a hole scavenger enhancing the photodeposition of Ag atoms. The formed nanocomposites were calcined at 300 and 400 • C under controlled atmosphere and later examined for photocatalytic performance using a 125 medium pressure mercury lamp decomposing formic acid as an organic pollutant. Morphological, crystallographical and UV-vis spectroscopy analyses were used to characterize the synthesized nanocomposites. The studies have revealed that non-calcined 0.5 wt.% Ag/TiO 2 nanocomposite has the best photocatalytic activity compared with other synthesized nanocomposites and that of the non-modified TiO 2 (P25). Further calcination of the synthesized nanocomposites has shown to be effective in lower Ag concentrations where 0.1 wt.% Ag/TiO 2 nanocomposite has the best photocatalytic activity at the 400 • C.