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Ali Pourjavadi,Rouhollah Soleyman,Ghasem Rezanejade Bardajee,Somayeh Ghavami 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
The synthesis of a novel superabsorbent hydrogel with natural hybrid backbone via graft copolymerization of acrylamide (AAm) onto kappa-carrageenan (kC, as a polysaccharide) and gelatin (as a protein) under classic thermal conditions is described. The Taguchi method as a strong experimental design tool was used for synthesis optimization. A series of hydrogels were synthesized by proposed conditions of Qualitek-4 Software. Considering the results of 9 trials according to analysis of variance (ANOVA), optimum conditions were proposed. The swelling behavior of optimum hydrogel was measured in various solutions with pH values ranging from 1 to 13. In addition, swelling kinetics, swelling in various organic solvents, various salt solutions and On–Off switching behavior were investigated. The hydrogel formation was confirmed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetrical analysis (TGA). Surface morphology of the synthesized hydrogels was assessed by scanning electron microscope (SEM).
Ali Pourjavadi,Zahra Mazaheri Tehrani,Safura Jokar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In the present work a novel multifunctional drug nanocarrier was prepared. Polyglycerol-gpolycaprolactonewas grafted on Mesoporous silica-coated magnetic graphene oxide. Doxorubicin, asanticancer drug, was loaded on this carrier. The in vitro drug release showed the controlled pHresponsive behavior. At the endosomal pH (pH 5.5) the amount of drug release enhanced. Thisnanocarrier would have potential application in the tumor therapy owing to its biodegradability,controlled release and pH responsive behavior
Ali Pourjavadi,Zahra Mazaheri Tehrani,Tayebe Shirvani,Malihe Doulabi,Ali Bumajdad 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
In this research, multi-walled carbon nanotubes (MWCNTs) were modified by dendritic macromonomer. Herein, polyamidoamine with acrylamide end groups was incorporated on MWCNTs. Afterwards,poly(N-isopropylacrylamide), (PNIPAM), was grafted on polyamidoamine in a facile synthesis. Then,doxorubicin as anticancer drug was loaded on this nanocarrier. The drug release was studied at belowand above the lower critical solution temperature of PNIPAM, (LCST 32 8C), 27 8C and 37 8C, respectively. At 37 8C (body temperature) the polymer shell dehydrated and the drug release increased. The profile ofdrug release was expressed by Higuchi’s equation which indicated that the drug release mechanism wasdiffusion controlled.
Ali Pourjavadi,Niloofar Safaie,Seyed Hassan Hosseini,Craig Bennett 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.38 No.-
A multi-layered catalyst based on poly(imidazole/imidazolium) and graphene oxide, with high loadingcapacity for immobilization of palladium nanoparticles was prepared. The catalyst was proven to behighly efficient for reduction of nitroarenes and also for Heck reaction with the use of only 0.1 mol% ofthe catalyst. The reduction of nitroarenes and Heck reaction were performed in water medium andexcellent yields of products were achieved. The synthesized catalyst was readily recovered and reusedfor up to 10 subsequent runs without significant loss of activity.
Pourjavadi, Ali,Soleyman, Rouhollah,Bardajee, Ghasem Rezanejade,Ghavami, Somayeh Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.11
The synthesis of a novel superabsorbent hydrogel with natural hybrid backbone via graft copolymerization of acrylamide (AAm) onto kappa-carrageenan (kC, as a polysaccharide) and gelatin (as a protein) under classic thermal conditions is described. The Taguchi method as a strong experimental design tool was used for synthesis optimization. A series of hydrogels were synthesized by proposed conditions of Qualitek-4 Software. Considering the results of 9 trials according to analysis of variance (ANOVA), optimum conditions were proposed. The swelling behavior of optimum hydrogel was measured in various solutions with pH values ranging from 1 to 13. In addition, swelling kinetics, swelling in various organic solvents, various salt solutions and On–Off switching behavior were investigated. The hydrogel formation was confirmed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetrical analysis (TGA). Surface morphology of the synthesized hydrogels was assessed by scanning electron microscope (SEM).
Synthesis and Properties of Partially Hydrolyzed Acrylonitrile-co-Acrylamide Superabsorbent Hydrogel
Pourjavadi, Ali,Hosseinzadeh, Hossein Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
In this work, a novel method to synthesis of an acrylic superabsorbent hydrogel was reported. In the two stage hydrogel synthesis, first copolymerization reaction of acrylonitrile (AN) and acrylamide (AM) monomers using ammonium persulfate (APS) as a free radical initiator was performed. In the second stage, the resulted copolymer was hydrolyzed to produce carboxamide and carboxylate groups followed by in situ crosslinking of the polyacrylonitrile chains. The results from FTIR spectroscopy and the dark red-yellow color change show that the copolymerization, alkaline hydrolysis and crosslinking reactions have been do take place. Scanning electron microscopy (SEM) verifies that the synthesized hydrogels have a porous structure. The results of Brunauer-Emmett-Teller (BET) analysis showed that the average pore diameter of the synthesized hydrogel was 13.9 nm. The synthetic parameters affecting on swelling capacity of the hydrogel, such as AM/AN weight ratio and hydrolysis time and temperature, were systematically optimized to achieve maximum swelling capacity (330 g/g). The swollen gel strength of the synthesized hydrogels was evaluated via viscoelastic measurements. The results indicated that superabsorbent polymers with high water absorbency were accompanied by low gel strength. The swelling of superabsorbent hydrogels was also measured in various solutions with pH values ranging from 1 to 13. Also, the pH reversibility and on-off switching behavior makes the hydrogel as a good candidate for controlled delivery of bioactive agents. Finally, the swelling of synthesized hydrogels with various particle sizes obey second order kinetics.
Ali Pourjavadi,Hossein Hosseinzadeh 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
In this work, a novel method to synthesis of an acrylic superabsorbent hydrogel was reported. In the two stage hydrogel synthesis, first copolymerization reaction of acrylonitrile (AN) and acrylamide (AM) monomers using ammonium persulfate (APS) as a free radical initiator was performed. In the second stage, the resulted copolymer was hydrolyzed to produce carboxamide and carboxylate groups followed by in situ crosslinking of the polyacrylonitrile chains. The results from FTIR spectroscopy and the dark red-yellow color change show that the copolymerization, alkaline hydrolysis and crosslinking reactions have been do take place. Scanning electron microscopy (SEM) verifies that the synthesized hydrogels have a porous structure. The results of Brunauer-Emmett-Teller (BET) analysis showed that the average pore diameter of the synthesized hydrogel was 13.9 nm. The synthetic parameters affecting on swelling capacity of the hydrogel,such as AM/AN weight ratio and hydrolysis time and temperature, were systematically optimized to achieve maximum swelling capacity (330 g/g). The swollen gel strength of the synthesized hydrogels was evaluated via viscoelastic measurements. The results indicated that superabsorbent polymers with high water absorbency were accompanied by low gel strength. The swelling of superabsorbent hydrogels was also measured in various solutions with pH values ranging from 1 to 13. Also, the pH reversibility and on-off switching behavior makes the hydrogel as a good candidate for controlled delivery of bioactive agents. Finally, the swelling of synthesized hydrogels with various particle sizes obey second order kinetics.
Protein-Directed Synthesis of γ-Fe2O3 Nanoparticles and Their Magnetic Properties Investigation
Rouhollah Soleyman,Ali Pourjavadi,Nazila Masoud,Akbar Varamesh,Abolfazl Sattari 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
In this study, maghemite (γ-Fe2O3) nanoparticles were produced using gelatin protein as an effective mediator. Size, shape, surface morphology and magnetic properties of the prepared γ-Fe2O3 nanoparticles were characterized using XRD, FT-IR, TEM, SEM and VSM data. The effects of furnace temperature and time of heating together with the amount of gelatin on the produced gelatin-Fe3O4 nanocomposite were examined to prove the fundamental effect of gelatin; both as a capping agent in the nanoscale synthesis and as the director of the spinel γ-Fe2O3 synthesis among possible Fe2O3 crystalline structures.
Soleyman, Rouhollah,Pourjavadi, Ali,Masoud, Nazila,Varamesh, Akbar,Sattari, Abolfazl Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
In this study, maghemite (${\gamma}-Fe_2O_3$) nanoparticles were produced using gelatin protein as an effective mediator. Size, shape, surface morphology and magnetic properties of the prepared ${\gamma}-Fe_2O_3$ nanoparticles were characterized using XRD, FT-IR, TEM, SEM and VSM data. The effects of furnace temperature and time of heating together with the amount of gelatin on the produced gelatin-$Fe_3O_4$ nanocomposite were examined to prove the fundamental effect of gelatin; both as a capping agent in the nanoscale synthesis and as the director of the spinel ${\gamma}-Fe_2O_3$ synthesis among possible $Fe_2O_3$ crystalline structures.
Nasrin Zohreh,Seyed Hassan Hosseini,Ali Pourjavadi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
A novel, magnetic nanocarrier was successfully synthesized through a facile and economical producer inwhich Fe3O4 magnetic nanoparticles were coated by starch-g-poly (methyl methacrylate-co-PEG-acrylamide). The surface of nanocarrier was then modified by hydrazine to preparation of a pHresponsivecarrier. The resulted nanocarrier was applied for delivery of doxorubicin (DOX) as an effectiveanti-cancer drug. DOX was reacted with hydrazine linkage on the surface of nanocarrier to formhydrazone bond. Due to the presence of numerous hydrazine groups on the surface of magneticnanocarrier large amounts of DOX was loaded onto the carrier (327 mg g 1).