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Synthesis of Organic Solvent Absorbent Crosslinked Polymers Based on Carbon Nanotubes and Hydrophobic Monomer
, Ph.D. Dissertation Sharif University of Technology ; Pourjavadi, Ali (Supervisor)
Abstract
In this thesis, organic solvent absorbent crosslinked polymers based on carbon nanotubes and hydrophobic monomers were synthesized by radical polymerization. Surfaces of carbon nanotubes were modified for the better dispersion in a polymeric matrix and participation in polymeric reactions. Different hydrophobic monomers such as diphenyl acrylamide and ionic liquids based on vinyl imidazolium cation with long alkyl chain and lipophilic counter anion such as tetrafluoro borate were synthesized and utilized with hydrophobic long alkyl chain acrylate monomers for the preparation of organogels. Swelling behavior of synthesized organogels in different organic solvents was investigated. The results...
Controlled Microwave-assisted Synthesis of ZnFe2O4 Nanoparticles and Investigation of their Catalytic Activity in Organic Reactions
, M.Sc. Thesis Sharif University of Technology ; Matloubi Moghaddam, Firouz (Supervisor)
Abstract
ZnFe2O4 nanoparticles have been successfully prepared through a controlled microwave–assisted co-precipitation as well as conventional co-precipitation. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) were used for the structural, morphological and magnetic investigation of the product. Average particle size was obtained as 12 nm from XRD. Catalytic activity of ZnFe2O4 nanopowder for O-acylation of alcohol and phenol has been investigated. A trace amount of ZnFe2O4 has been effectively used as a nanocatalyst for the acylation of alcohol and phenol in acetic anhydride.
Synthesis of new electromagnetic nanocomposite based on modified Fe3O4 nanoparticles with enhanced magnetic, conductive, and catalytic properties
, Article International Journal of Polymeric Materials and Polymeric Biomaterials ; Volume 65, Issue 8 , 2016 , Pages 384-390 ; 00914037 (ISSN) ; Doroudian, M ; Afshar Saveh, Z ; Doulabi, M ; Sharif University of Technology
Taylor and Francis Inc
2016
Abstract
A new method for the fabrication of an electromagnetic nanocomposite based on Fe3O4 and polyaniline (PANI) is offered. The authors focused on improvement of the physical and electromagnetic properties of the nanocomposite using a new synthetic method. Supermagnetic Fe3O4 nanoparticles were synthesized through coprecipitation method. As a chemical modification, the third generation of poly (amidoamine) dendrimer was grafted on the surface of the nanoparticles. PANI was grafted from -NH2 functional groups of dendrimer via in situ polymerization of aniline. Finally, Au nanoparticles were loaded on the nanocomposite and its catalytic activity for reduction reactions was studied
Dendritic multi-walled carbon nanotube with thermoresponsive shells: A good carrier for anticancer drugs
, Article Journal of Industrial and Engineering Chemistry ; Volume 35 , 2016 , Pages 332-340 ; 1226086X (ISSN) ; Mazaheri Tehrani, Z ; Shirvani, T ; Doulabi, M ; Bumajdad, A ; Sharif University of Technology
Korean Society of Industrial Engineering Chemistry
2016
Abstract
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 below and above the lower critical solution temperature of PNIPAM, (LCST 32 °C), 27 °C and 37 °C, respectively. At 37 °C (body temperature) the polymer shell dehydrated and the drug release increased. The profile of drug release was expressed by Higuchi's equation which indicated that the drug release mechanism was...
Evaporation mitigation assessment by self-assembled nano-thickness films in shallow fresh water lake using fixed and semi-floating pans
, Article Environmental Processes ; Volume 9, Issue 3 , 2022 ; 21987491 (ISSN) ; Mohammadi, M ; Doulabi, M ; Iraji zad, A ; Tajrishy, M ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
Controlling evaporation plays an essential role in arid and semi-arid water resources systems where it accounts for a considerable amount of reservoirs outflow. In this study, we have evaluated evaporation reduction efficiency of different kinds of self-assembled nano-thickness films. The films consist of six different combinations of stearyl and cetyl alcohols with additives such as jojoba oil, stearic acid, and calcium hydroxide. The study lasted from July to August and utilized two pairs of class A evaporation pans: one pair was semi-floating on Chitgar lake water surface while the other one was located on the shore. The experimental results showed that a monolayer containing 3:1 stearyl...
Multi-Layer functionalized poly(ionic liquid) coated magnetic nanoparticles: Highly recoverable and magnetically separable brønsted acid catalyst
, Article ACS Catalysis ; Volume 2, Issue 6 , 2012 , Pages 1259-1266 ; 21555435 (ISSN) ; Hosseini, S. H ; Doulabi, M ; Fakoorpoor, S. M ; Seidi, F ; Sharif University of Technology
2012
Abstract
A functionalized poly(ionic liquid) coated magnetic nanoparticle (Fe 3O 4@PIL) catalyst was successfully synthesized by polymerization of functionalized vinylimidazolium in the presence of surface modified magnetic nanoparticles. The resulting heterogeneous catalyst is shown to be an efficient acidic catalyst for synthesis of 1,1-diacetyl from aldehydes under solvent free conditions and room temperature in high yields. Also, the catalyst shows good activity for the deprotection reaction of acylals. After completion of reaction, the catalyst was simply recovered by an external conventional magnet and recycled without significant loss in the catalytic activity. Because of the polymer layers...
Facile entry to polycyclic indolylhydroquinoline skeletons via tandem C-alkylation and intramolecular S-alkylation
, Article Tetrahedron ; Volume 66, Issue 1 , 2010 , Pages 134-138 ; 00404020 (ISSN) ; Mirjafary, Z ; Saeidian, H ; Taheri, S ; Doulabi, M ; Kiamehr, M ; Sharif University of Technology
2010
Abstract
An efficient, single step synthesis of hitherto unknown indole-annulated pentacyclic indolylhydroquinolines via tandem C-alkylation and intramolecular S-alkylation of indolin-2-thiones with N-alkylquinolinium salts in excellent yields (83-95%) is reported. This facile approach provides a powerful entry into polycyclic structures containing nitrogen and sulfur related to alkaloids. The structure of the product was determined by Röntgen crystal structure analysis