CuCl heterogenized on metformine-modified multi walled carbon nanotubes as a recyclable nanocatalyst for Ullmann-type C–O and C–N coupling reactions

2018 ◽  
Vol 42 (4) ◽  
pp. 2782-2789 ◽  
Author(s):  
Elham Akhavan ◽  
Saba Hemmati ◽  
Malak Hekmati ◽  
Hojat Veisi
Keyword(s):  
Carbon Nanotubes ◽  
Synthesis Method ◽  
Coupling Reactions ◽  
Covalent Grafting ◽  
Multi Walled Carbon Nanotubes ◽  
Type C ◽  
Walled Carbon Nanotubes

Herein, a novel MWCNTs-Met/CuCl nanocatalyst synthesis method by metformine covalent grafting on the surface of carbon nanotubes and subsequent coordination with a CuCl catalyst is described.

scholarly journals Correction: CuCl heterogenized on metformine-modified multi walled carbon nanotubes as a recyclable nanocatalyst for Ullmann-type C–O and C–N coupling reactions

2018 ◽  
Vol 42 (16) ◽  
pp. 14009-14009 ◽  
Author(s):  
Elham Akhavan Taheri ◽  
Saba Hemmati ◽  
Malak Hekmati ◽  
Hojat Veisi
Keyword(s):  
Carbon Nanotubes ◽  
Coupling Reactions ◽  
Multi Walled Carbon Nanotubes ◽  
Type C ◽  
Walled Carbon Nanotubes

Correction for ‘CuCl heterogenized on metformine-modified multi walled carbon nanotubes as a recyclable nanocatalyst for Ullmann-type C–O and C–N coupling reactions’ by Elham Akhavan Taheri et al., New J. Chem., 2018, 42, 2782–2789.

Two-step synthesis of polyurethane/multi-walled carbon nanotubes polymer composite to achieve high percentage particle reinforcement for mechanical applications

2021 ◽  
pp. 002199832199945
Author(s):  
Dinesh Kumar ◽  
Suneev Anil Bansal ◽  
Navin Kumar ◽  
Prashant Jindal
Keyword(s):  
Carbon Nanotubes ◽  
Synthesis Method ◽  
Step Method ◽  
Molding Method ◽  
Uniform Dispersion ◽  
Noticeable Improvement ◽  
Multi Walled Carbon Nanotubes ◽  
Mixing Method ◽  
Compressive Testing ◽  
Walled Carbon Nanotubes

The present work has been aimed to synthesize Polyurethane (PU)/Multi-Walled Carbon Nanotubes (MWCNTs) composite using a two-step method to enhance mechanical properties. In the first step, films (0.2 mm thickness) have been synthesized using a solution mixing method to disperse MWCNTs in the PU matrix. In the second step, thin films of uniformly dispersed MWCNTs in the PU matrix have been compression molded to synthesize PU/MWCNTs composite required for real mechanical applications. The two-step method has the advantages of solution mixing as well as compression molding method. The results of quasi-static nanoindentation tests indicated that in comparison to pure PU, elastic modulus and hardness have been enhanced by 124% and 53% respectively for 10 wt% PU/MWCNTs composite. Fracture resistance of PU/MWCNTs composites, with 7 wt% of MWCNTs, has been enhanced by 52% as compared to pure PU. To understand bulk behavior, nanoindentation results have been cross-verified with compression testing. Results of compressive testing shown that the modulus of composite material has been significantly improved under the influence of the increasing composition of MWCNTs. A noticeable improvement of 52% has been observed in compressive modulus of 10 wt% composite in equivalence to pure PU. The overall improvement in mechanical behavior has been attributed to the uniform dispersion of MWCNTs in the PU matrix by the two-step synthesis method.

A new one-step synthesis method for coating multi-walled carbon nanotubes with iron oxide nanorods

2012 ◽  
Vol 14 (1) ◽  
Author(s):  
HaoJie Song ◽  
Jing Qian ◽  
XiaoHua Jia ◽  
XiaoFei Yang ◽  
Hua Tang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Synthesis Method ◽  
Oxide Nanorods ◽  
Multi Walled Carbon Nanotubes ◽  
One Step ◽  
Walled Carbon Nanotubes

Palladium NPs supported on novel imino-pyridine-functionalized MWCNTs: efficient and highly reusable catalysts for the Suzuki–Miyaura and Sonogashira coupling reactions

2016 ◽  
Vol 40 (6) ◽  
pp. 4945-4951 ◽  
Author(s):  
Mehdi Adib ◽  
Rahman Karimi-Nami ◽  
Hojat Veisi
Keyword(s):  
Carbon Nanotubes ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Heterogeneous Nanocatalyst ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Functionalized Mwcnts

In this article a new heterogeneous nanocatalyst based on palladium supported on functionalized multi-walled carbon nanotubes (MWCNTs) has been introduced.

A New Approach to the Synthesis of Carbon Nanotube-Polyhedral Oligomeric Silsesquioxane (POSS) Nanohybrids

2015 ◽  
Author(s):  
Seyed Morteza Sabet ◽  
Hassan Mahfuz ◽  
Andrew C. Terentis ◽  
Javad Hashemi
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Amide Bonds ◽  
Covalent Grafting ◽  
Multi Walled Carbon Nanotubes ◽  
Functionalization Of Carbon Nanotubes ◽  
Oligomeric Silsesquioxane ◽  
Walled Carbon Nanotubes

To date, the functionalization of carbon nanotubes (CNTs) with Polyhedral Oligomeric Silsesquioxanes (POSS) has become one of the most intensively explored methods to produce CNT-based nanostructure composite materials. In this study, a simple and effective synthesizing method has been reported to prepare a nanohybrid material consisting of multi-walled carbon nanotubes (MWCNT) and aminopropylisobutyl-POSS. The approach is based on covalent bonding between CNTs and POSS molecules. Characterization of the as-received materials as well as the POSS-treated CNTs has been performed. Raman and Fourier transform infrared spectroscopic analyses verify the covalent grafting of POSS onto CNT walls through the formation of amide bonds. TEM studies reveal the attachment of relatively high amount of POSS to the CNT walls in POSS-treated product. TGA observations suggest that the presence of relatively high amount of POSS in MWCNT-POSS product is responsible for the thermal stability of CNTs at temperature range of RT–200 °C. The resulting nanohybrids with improved functionality and thermal stability would be good candidates as reinforcing materials for compatible polymer matrices.

scholarly journals Nickel-Fe3O4 Magnetic Nanoparticles Supported on Multiwalled Carbon Nanotubes: Effective Catalyst in Suzuki Cross Coupling Reactions

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 495
Author(s):  
Sojeong K. Folsom ◽  
Destiny J. Ivey ◽  
Frank S. McNair ◽  
Ali R. Siamaki
Keyword(s):  
Carbon Nanotubes ◽  
Fe3o4 Nanoparticles ◽  
Nickel Nanoparticles ◽  
Cross Coupling ◽  
Conventional Heating ◽  
Coupling Reactions ◽  
X Ray ◽  
Cross Coupling Reactions ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Nickel-Fe3O4 nanoparticles supported on multi-walled carbon nanotubes (Ni-Fe3O4/MWCNTs) were synthesized by mechanical grinding of a sample of nickel salt, Fe3O4 and MWCNTs using a ball-mill mixer. The preparation method allows for bulk production of Ni-Fe3O4 nanoparticles at room temperature without the necessity of any solvent or chemical reagent. The nanoparticles prepared by this method exhibit small particles size of 5–8 nm with uniform dispersion of nickel nanoparticles on the surface of multi-walled carbon nanotubes. The Ni-Fe3O4/MWCNTs demonstrated remarkable catalytic activity for Suzuki cross coupling reactions of functionalized aryl halides and phenylboronic acids with excellent turnover number and turnover frequency (e.g., 76,000 h−1) using Monowave 50 conventional heating reactor at 120 °C within a very short reaction time of 15 min. The catalyst is air-stable and exhibits easy removal from the reaction mixture due to its magnetic properties, recyclability with no loss of activity, and significantly better performance than the other well-known commercial nickel catalyst. The Ni-Fe3O4/MWCNTs nanoparticles were fully characterized by a variety of spectroscopic techniques including X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). Since nickel offers similar properties to other more expensive transition metals including the most widely used palladium counterpart in cross coupling catalysis, this work demonstrates a promising lower-cost, air-moisture stable and efficient alternative catalyst based on nickel nanoparticles for cross coupling reactions.

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