Dynamic-Mechanical and Rheological Properties of the Photo-Degraded Low-Density Polyethylene/Manganese Stearate/Trisilver Phosphate/Cadmium Selenide Composites Abdolnaser Gharehdashli, Saeed Mortazavi, Hamed Rashidi Polymer Science Series A, 2022 Abstract Photodegradable films of low-density polyethylene (LDPE) were prepared by melt blending of the polymer with cadmium selenide (CdSe) and trisilver phosphate (Ag3PO4) as photo-catalysts and manganese stearate as pro-oxidant. The samples were irradiated with visible and ultra-violet light. Scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and viscometry measurements were used to investigate the microstructure of the films. The results showed that the combination of the photo-catalysts and the pro-oxidants has synergistic effect on the photo-degradation of the LDPE and accelerates a lot more its degradation process than when only the pro-oxidant was used.
Hydrothermal Performance Augmentation of a Rectangular Channel Via Novel Designs of Transverse Turbulators: An Insight into Performance Improvement of Solar Air Heaters M. Khosravi, M. Khoshvaght-Aliabadi, S. Mortazavi Experimental Techniques, 2022 The current experimental study focuses on designing novel shapes of transverse turbulators to improve the performance of solar air heaters. Fourteen designs are derived from the original case having length × width × thickness of 30 mm × 15 mm × 0.8 mm. These turbulators are tested in a rectangular channel, and the thermal and hydraulic transport performances of the fitted channel are compared with those obtained for the vacant channel. Although the novel geometries may provide a weaker thermal characteristic through the channel, the penalty in the hydraulic characteristic is decreased significantly compared to the original shape, leading to better overall hydrothermal performances. It is found that the novel designs of transverse turbulators own lower values of heat transfer coefficient, that is ranging from 12.1% to 45.2%, whereas the pressure drop decreases within the range of 48%–91% at the studied Reynolds numbers (Re = 1643, 3286, and 4929). The results show that the Nusselt number ratio (Nufitted/Nuclear) gets reducing trend with increasing Re, while the friction factor ratio (ffitted/fclear) gets increasing trend. An appropriate tradeoff between thermal and hydraulic characteristics is established by using a specific design which presents minimum values of pressure drop and maximum values of the performance index. The highest index of 1.69 is recorded for this turbulator design at Re = 1643.
Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer R. Mortazavi, S. Mortazavi, A. Troncoso Engineering with Computers, 2022 This paper introduces different types of regression trees for viscosity property forecasting in polymer solutions. Although regression trees have been extensively used in other fields, they do not have been explored to predict the viscosity. One key issue in the context of materials science is to determine a priori which characteristics must be included to describe the prediction model due to a large number of molecular descriptors is obtained. To deal with this, we propose a wrapper method to select the features based on regression trees. Thus, we use regression trees to evaluate different subsets of attributes and build a model from the subset of features that achieved the minimum error. In particular, the performance of eight regression tree algorithms, including both linear and non-linear models, is evaluated and compared to other forecasting approaches using a dataset composed of 64 polymers and 2962 molecular descriptors. The results show that regression trees with nearest neighbors based local models in leaves predict with high accuracy. Moreover, results have been compared to other forecasting approaches such as multivariate linear regression, neural networks and support vector machines showing remarkable improvements in terms of accuracy.
Vinyl ester/silica aerogel nanocomposite coatings with enhanced hydrophobicity and corrosion protection properties Kiyoumars Labani Motlagh, Javad Seyfi, Hossein Ali Khonakdar, Saeed Mortazavi Polymers for Advanced Technologies, 2021 Abstract Vinyl ester (VE) resins have been widely used in the coating industry. However, research on its potential in anti‐corrosion applications has been limited. In this work, silica aerogels were first synthesized and then incorporated into the VE resin at 5, 10, and 15 wt% with respect to the VE content. Based on the morphological results, higher inclusions of silica aerogels (10 and 15 wt%) were significantly aggregated at the surface layer of the coatings leading to a highly rough surface structure which was also proved by atomic force microscopy. In fact, the aerogel nanoparticles formed a very packed structure leading to the formation of an effective physical barrier against corrosive agents. Fourier‐transform infrared spectroscopy also revealed that the nanocomposite coatings exhibited a lower water absorption behavior which could be beneficial for the anti‐corrosion behavior. Wetting results demonstrated that the water contact angle has essentially increased from 61° for the pure VE coating to 92° for the aerogel‐loaded coating. Such enhancement in hydrophobicity and also the creation of a physical barrier at the surface layer of the coatings led to promising barrier results as found by Tafel polarization curves. The protection efficiency was dramatically improved to 97.9% for the highest inclusion of silica aerogel.
Photodegradation of low-density polyethylene with prooxidant and photocatalyst Abdolnaser Gharehdashli, Saeed Mortazavi, Hamed Rashidi Journal of Applied Polymer Science, 2020 Abstract Low‐density polyethylene (LDPE) composite films with trisilver phosphate (Ag 3 PO 4 ) and cadmium selenide (CdSe) particles as photocatalysts and manganese stearate as prooxidant were prepared. The film samples were irradiated under UV and visible light and their photodegradation were evaluated using Fourier‐transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry. The carbonyl index of the photocatalyst containing samples was very higher than the pure irradiated LDPE and even prooxidant containing film. The morphologies of the irradiated composite films were completely changed and had many cavities and cracks. The thermal stability of the composites was very lower than the pure polyethylene. However the crystallinity of the LDPE films with photocatalysts was enhanced contrarily the LDPE film with manganese stearate. Generally the results showed that the combination of the prooxidant with photocatalyst have synergistic effect on the photodegradation of the LDPE and can be used to accelerate the degradation of the polyethylene films.
Preparation and characterization of polyvinyl alcohol/chitosan blends plasticized and compatibilized by glycerol/polyethylene glycol Majid Shojaee Kang Sofla, Saeed Mortazavi, Javad Seyfi Carbohydrate Polymers, 2020 The synergistic plasticization/compatibilization effect of poly(ethylene glycol)/glycerol is reported for poly(vinyl alcohol) (PVA)/chitosan blends. The optimum concentration of PEG was first determined by preparation and characterization of PVA/PEG blends at different ratios (9:1, 6:1 and 3:1). The PVA/chitosan blends, plasticized with PEG, glycerol, and their combination, were also prepared and characterized. Fourier transform infrared results suggested that PEG enhances the compatibility of PVA/chitosan blends. This claim was further confirmed by the morphological results. However, PEG had a detrimental effect on the crystallinity of PVA/chitosan blends. The combination of glycerol and PEG caused a five-time enhancement in the elongation at break values as compared with the blend plasticized with glycerol. The antibacterial properties against E. coli were also evaluated. All in all, the high antibacterial properties of the blend films along with good mechanical and morphological properties could be beneficial in wound dressing and food packaging applications which need further investigation.
Combined effects of holes and winglets on chevron plate-fins to enhance the performance of a plate-fin heat exchanger working with nanofluid Khoshvaght-Aliabadi Morteza, Saeid Mortazavi Experimental Heat Transfer, 2019 The current work reports an experimental study on hydrothermal improvement in a chevron plate-fin heat exchanger combined with holes and winglets. The experiments are performed for water flow through a test square duct fitted with enhanced chevron plate-fins for the Reynolds number from 4000 to 10000. Characteristics of the enhanced chevron plate-fins include three waviness aspect ratios and four different arrangements of holes and winglets at a constant diameter of holes and width/height of winglets. An overall performance factor is applied to obtain the optimal geometry. Then, only the optimal geometries are applied to find out the effect of Al2O3/water nanofluid flow on the performance of a plate-fin heat exchanger. In comparison to simple chevron plate-fins, the enhanced ones would increase the Nusselt number by a factor between 1.05% and 1.6%. In addition, simultaneous application of the optimal enhanced chevron plate-fins and the nanofluid could increase the Nusselt number. The best working conditions of this system are detected for the nanofluid at a weight fraction of 0.3%.
Preparation and characterisation of hydroxyl-terminated polybutadiene-based polyurethane/graphene nanocomposites Seyyed Ali Hosseini, Saeed Mortazavi, Jafar Izadi Nia Plastics Rubber and Composites, 2018 Polyurethane nanocomposites based on hydroxyl-terminated polybutadiene and graphene with different formulations were cured using toluene diisocyanates. The rheological, physical, mechanical, thermal and morphological properties of the nanocomposites were investigated. The viscosity of the samples increased rapidly with graphene content. However, the kinetic rate of the curing process was lower for the nanocomposites in comparison to the neat matrix. The mechanical properties showed a successive increase in the tensile strength and reduction in elongation at break with an increase in graphene content. The highest value of the modulus, density and degradation temperature was obtained for the nanocomposite with 1 wt-% graphene. The hardness properties of the nanocomposites enhanced with curing time. The morphological properties of the nanocomposites are also investigated with the field emission scanning electron microscopy which confirmed the agglomeration occurrence at the high graphene contents.
Investigation the photo-degradation of low-density polyethylene containing pro-oxidant and photo-catalyst A Gharehdashli, S Mortazavi, H Rashidi Journal of Applied Research of Chemical-Polymer Engineering 6 (3), 3-18 , 2022 2022
Dynamic-Mechanical and Rheological Properties of the Photo-Degraded Low-Density Polyethylene/Manganese Stearate/Trisilver Phosphate/Cadmium Selenide Composites A Gharehdashli, S Mortazavi, H Rashidi Polymer Science, Series A 64 (6), 872-881 , 2022 2022
Hydrothermal performance augmentation of a rectangular channel via novel designs of transverse turbulators: an insight into performance improvement of solar air heaters M Khosravi, M Khoshvaght-Aliabadi, S Mortazavi Experimental Techniques 46 (5), 889-903 , 2022 2022 Citations: 3
Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer R Mortazavi, S Mortazavi, A Troncoso Engineering with Computers 38 (3), 2553-2565 , 2022 2022 Citations: 13
Investigating the effects of graphene content and application method on surface properties of vinyl ester/silica aerogel coatings K Labani Motlagh, J Seyfi, HA Khonakdar, S Mortazavi Macromolecular Research 30 (5), 334-341 , 2022 2022 Citations: 11
Vinyl ester/silica aerogel nanocomposite coatings with enhanced hydrophobicity and corrosion protection properties K Labani Motlagh, J Seyfi, HA Khonakdar, S Mortazavi Polymers for Advanced Technologies 32 (5), 2176-2184 , 2021 2021 Citations: 17
Comparative pathologic Study of Effect of Cold atmospheric Plasma and Ultraviolet Radiation on Staphylococcus aureus Infection in Diabetic Rats P Dehghanpishe, A Jahandideh, A Asghari, SP Mortazavi, ... Veterinary Research & Biological Products 34 (1), 76-86 , 2021 2021 Citations: 1
Photodegradation of low‐density polyethylene with prooxidant and photocatalyst A Gharehdashli, S Mortazavi, H Rashidi Journal of Applied Polymer Science 137 (34), 48979 , 2020 2020 Citations: 15
Preparation and characterization of polyvinyl alcohol/chitosan blends plasticized and compatibilized by glycerol/polyethylene glycol MSK Sofla, S Mortazavi, J Seyfi Carbohydrate Polymers 232, 115784 , 2020 2020 Citations: 135
Combined effects of holes and winglets on chevron plate-fins to enhance the performance of a plate-fin heat exchanger working with nanofluid KA Morteza, S Mortazavi Experimental Heat Transfer 32 (6), 584-599 , 2019 2019 Citations: 21
Preparation and characterisation of hydroxyl-terminated polybutadiene-based polyurethane/graphene nanocomposites SA Hosseini, S Mortazavi, JI Nia Plastics, Rubber and Composites 47 (6), 241-248 , 2018 2018 Citations: 4
Modeling the Organic Pollutants Removal from Refinery Wastewaters Using the Activated Carbon Adsorbent in the Neural Network through Experimental Data P Karimian, H Bahmanpour, S Mortazavi Journal of Biochemical Technology 9 (2-2018), 52-57 , 2018 2018
Computational analysis of the flow of pseudoplastic power-law fluids in a microchannel plate S Mortazavi Chinese Journal of Chemical Engineering 25 (10), 1360-1368 , 2017 2017 Citations: 8
Preparation and Characterization of Polyvinylpyrrolidone/Carboxyl Functionalized Multiwalled Carbon Nanotube Nanocomposite F Haghighat, M Mokhtary, S Mortazavi Nashrieh Shimi va Mohandesi Shimi Iran 36 (1), 159-167 , 2017 2017 Citations: 1
Study of Heat Transfer and Exergy Analysis in Double-tubed Heat Exchangers Equipped with Turbulenter Using Nanofluid TiO2 SM Hosseini, M Mohammadiun, S Mortazavi 2016
Nanofluid properties for forced convection heat transfer: a review M Darabi, R Naeimi, H Mohammadiun, S Mortazavi International Journal of Scientific World 3 (1), 145-151 , 2015 2015 Citations: 7
The comparison of performance of bidboland gas refinery unit based on the current designing and the new designing M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi International Journal of Scientific World 3 (1), 76-80 , 2015 2015 Citations: 1
Simulation and optimization integrated gasification combined cycle by used aspen hysys and aspen plus M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi, M Montazeri International Journal of Scientific World 3 (1), 178-186 , 2015 2015 Citations: 4
The simulation and design air conditioner in unit 103 of south pars with use advance exergy M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi, H Maddah International Journal of Scientific World 3 (1), 137-144 , 2015 2015 Citations: 1
Morphological and rheological properties of (low‐density polyethylene)/thermoplastic starch blend: investigation of the role of high elastic network S Mortazavi, I Ghasemi, A Oromiehie Journal of Vinyl and Additive Technology 20 (4), 250-259 , 2014 2014 Citations: 20
MOST CITED SCHOLAR PUBLICATIONS
Preparation and characterization of polyvinyl alcohol/chitosan blends plasticized and compatibilized by glycerol/polyethylene glycol MSK Sofla, S Mortazavi, J Seyfi Carbohydrate Polymers 232, 115784 , 2020 2020 Citations: 135
Effect of phase inversion on the physical and mechanical properties of low density polyethylene/thermoplastic starch S Mortazavi, I Ghasemi, A Oromiehie Polymer testing 32 (3), 482-491 , 2013 2013 Citations: 65
Combined effects of holes and winglets on chevron plate-fins to enhance the performance of a plate-fin heat exchanger working with nanofluid KA Morteza, S Mortazavi Experimental Heat Transfer 32 (6), 584-599 , 2019 2019 Citations: 21
Morphological and rheological properties of (low‐density polyethylene)/thermoplastic starch blend: investigation of the role of high elastic network S Mortazavi, I Ghasemi, A Oromiehie Journal of Vinyl and Additive Technology 20 (4), 250-259 , 2014 2014 Citations: 20
Prediction of tensile modulus of nanocomposites based on polymeric blends S Mortazavi, I Ghasemi, A Oromiehie Iranian Polymer Journal 22 (6), 437-445 , 2013 2013 Citations: 20
Vinyl ester/silica aerogel nanocomposite coatings with enhanced hydrophobicity and corrosion protection properties K Labani Motlagh, J Seyfi, HA Khonakdar, S Mortazavi Polymers for Advanced Technologies 32 (5), 2176-2184 , 2021 2021 Citations: 17
Photodegradation of low‐density polyethylene with prooxidant and photocatalyst A Gharehdashli, S Mortazavi, H Rashidi Journal of Applied Polymer Science 137 (34), 48979 , 2020 2020 Citations: 15
Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer R Mortazavi, S Mortazavi, A Troncoso Engineering with Computers 38 (3), 2553-2565 , 2022 2022 Citations: 13
Investigating the effects of graphene content and application method on surface properties of vinyl ester/silica aerogel coatings K Labani Motlagh, J Seyfi, HA Khonakdar, S Mortazavi Macromolecular Research 30 (5), 334-341 , 2022 2022 Citations: 11
Computational analysis of the flow of pseudoplastic power-law fluids in a microchannel plate S Mortazavi Chinese Journal of Chemical Engineering 25 (10), 1360-1368 , 2017 2017 Citations: 8
Nanofluid properties for forced convection heat transfer: a review M Darabi, R Naeimi, H Mohammadiun, S Mortazavi International Journal of Scientific World 3 (1), 145-151 , 2015 2015 Citations: 7
Preparation and characterisation of hydroxyl-terminated polybutadiene-based polyurethane/graphene nanocomposites SA Hosseini, S Mortazavi, JI Nia Plastics, Rubber and Composites 47 (6), 241-248 , 2018 2018 Citations: 4
Simulation and optimization integrated gasification combined cycle by used aspen hysys and aspen plus M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi, M Montazeri International Journal of Scientific World 3 (1), 178-186 , 2015 2015 Citations: 4
Hydrothermal performance augmentation of a rectangular channel via novel designs of transverse turbulators: an insight into performance improvement of solar air heaters M Khosravi, M Khoshvaght-Aliabadi, S Mortazavi Experimental Techniques 46 (5), 889-903 , 2022 2022 Citations: 3
Comparative pathologic Study of Effect of Cold atmospheric Plasma and Ultraviolet Radiation on Staphylococcus aureus Infection in Diabetic Rats P Dehghanpishe, A Jahandideh, A Asghari, SP Mortazavi, ... Veterinary Research & Biological Products 34 (1), 76-86 , 2021 2021 Citations: 1
Preparation and Characterization of Polyvinylpyrrolidone/Carboxyl Functionalized Multiwalled Carbon Nanotube Nanocomposite F Haghighat, M Mokhtary, S Mortazavi Nashrieh Shimi va Mohandesi Shimi Iran 36 (1), 159-167 , 2017 2017 Citations: 1
The comparison of performance of bidboland gas refinery unit based on the current designing and the new designing M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi International Journal of Scientific World 3 (1), 76-80 , 2015 2015 Citations: 1
The simulation and design air conditioner in unit 103 of south pars with use advance exergy M Darabi, M Mohammadiun, H Mohammadiun, S Mortazavi, H Maddah International Journal of Scientific World 3 (1), 137-144 , 2015 2015 Citations: 1
Investigation the photo-degradation of low-density polyethylene containing pro-oxidant and photo-catalyst A Gharehdashli, S Mortazavi, H Rashidi Journal of Applied Research of Chemical-Polymer Engineering 6 (3), 3-18 , 2022 2022
Dynamic-Mechanical and Rheological Properties of the Photo-Degraded Low-Density Polyethylene/Manganese Stearate/Trisilver Phosphate/Cadmium Selenide Composites A Gharehdashli, S Mortazavi, H Rashidi Polymer Science, Series A 64 (6), 872-881 , 2022 2022
Publications
Labani Motlagh, Kiyoumars; Seyfi, Javad; Khonakdar, Hossein Ali; Mortazavi, Saeed; Vinyl ester/silica aerogel nanocomposite coatings with enhanced hydrophobicity and corrosion protection properties Polymers for Advanced Technologies 32 5 2176-2184 2021 Wiley Online Library
Mortazavi, R; Mortazavi, S; Troncoso, A; Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer Engineering with Computers 44209 2021 Springer
Gharehdashli, Abdolnaser; Mortazavi, Saeed; Rashidi, Hamed; Photodegradation of lowâ€density polyethylene with prooxidant and photocatalyst Journal of Applied Polymer Science 137 34 48979 2020 Wiley Online Library
Sofla, Majid Shojaee Kang; Mortazavi, Saeed; Seyfi, Javad; Preparation and characterization of polyvinyl alcohol/chitosan blends plasticized and compatibilized by glycerol/polyethylene glycol Carbohydrate polymers 232 115784 2020 Elsevier
Morteza, Khoshvaght-Aliabadi; Mortazavi, Saeid; Combined effects of holes and winglets on chevron plate-fins to enhance the performance of a plate-fin heat exchanger working with nanofluid Experimental Heat Transfer 32 6 584-599 2019 Taylor & Francis
Hosseini, Seyyed Ali; Mortazavi, Saeed; Nia, Jafar Izadi; Preparation and characterisation of hydroxyl-terminated polybutadiene-based polyurethane/graphene nanocomposites Plastics, Rubber and Composites 47 6 241-248 2018 Taylor & Francis
Haghighat, Fatemeh; Mokhtary, Masoud; Mortazavi
