scholarly journals Vapor Phase Modification for Selective Enrichment of Grafted Styrene/Acrylonitrile onto Carbon Nanotubes Via ATRP

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 459
Author(s):  
Maryam Azadbakht ◽  
Elnaz Esmizadeh ◽  
Ali Vahidifar ◽  
Tizazu H. Mekonnen ◽  
Mehdi Salami-Kalajahi
Keyword(s):  
Carbon Nanotubes ◽  
1H Nmr ◽  
Vapor Phase ◽  
Proton Nuclear Magnetic Resonance ◽  
Acid Vapor ◽  
Selective Enrichment ◽  
Pristine Mwcnts ◽  
Morphological Studies ◽  
Phase Oxidation ◽  
Multi Walled Carbon Nanotubes

Nitric acid vapor phase oxidation of multi-walled carbon nanotubes (MWCNTs) was proposed as a promising technique to fabricate poly styrene-co-acrylonitrile (SAN)-grafted-CNTs via atom transfer radical polymerization (ATRP). The in-situ ATRP grafting approach was successfully employed to graft polystyrene (PS), SAN and polyacrylonitrile (PAN), onto the convex surfaces of pristine MWCNTs (PCNT) and acid-functionalized MWCNTs (FCNT). Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR), and thermogravimetric analysis (TGA) confirmed the effectiveness of the modification via the ATRP grafting approach. The molar composition of acrylonitrile in the synthesized copolymer on the surface of CNTs for an FCNTs was calculated to be about 80% and 67.5% by 1H-NMR and TGA respectively, whereas the value is lower for PCNTs. Morphological studies showed that SAN-grafted FCNTs exhibit rougher surface morphology compared to the SAN-grafted PCNTs. Moreover, the higher diameter of the FCNTs indicated the higher polymer content, which was coated onto CNTs functionalized by vapor-phase oxidation. Therefore, the vapor phase oxidation strategy employed in this study could be utilized as a general method to prepare CNTs which can serve as an ATRP macroinitiator for the fabrication of various polymer grafted CNTs.

Synthesis of Dihydromyricetin Coated Multi-Walled Carbon Nanotubes (MWCNTs) and Antibacterial Activities

2020 ◽  
Vol 20 (10) ◽  
pp. 6148-6154
Author(s):  
Dan Liu ◽  
Jun Luo ◽  
Hao Wang ◽  
Lijun Ding ◽  
Xin-An Zeng
Keyword(s):  
Carbon Nanotubes ◽  
Pathogenic Bacteria ◽  
Antimicrobial Property ◽  
Antibacterial Activities ◽  
Gravimetric Analysis ◽  
Pristine Mwcnts ◽  
Antimicrobial Material ◽  
Ir Transmission ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The weak antimicrobial property of multi-walled carbon nanotubes (MWCNTs) hampers their use as an antimicrobial material. In the report, Dihydromyricetin (DMY) coated multi-walled carbon nanotubes (MWCNTs-DMY) were prepared with poly(ethylene glycol) (PEG1000) as a linker and evaluated for inactivating pathogenic bacteria. UV-visible spectra, FT-IR, transmission electron microscopy (TEM), and thermal gravimetric analysis (TGA) were used to characterize the MWCNTs-DMY. It has been shown that PEG and DMY are covalently attached to MWCNTs with excellent stability. Vibrio parahaemolyticus was employed as the target bacterium. Comparing with the raw and the functionalized MWCNTs (r-MWCNTs and f-MWCNTs), MWCNTs-DMY exhibited stronger antibacterial ability. The MWCNTs-DMY composite showed up to 10-fold higher antimicrobial property than pristine MWCNTs. The deposited DMY was suggested to play an important role in the bactericidal action of MWCNTs-DMY. The results of this study demonstrated that MWCNTs-DMY composite can serve as an effective and economical antimicrobial material.

Study on Effect of Acid and Heat Treatments of Multi-Walled Carbon Nanotubes on Benzene Detection

2015 ◽  
Vol 1103 ◽  
pp. 105-111 ◽  
Author(s):  
Thanattha Chobsilp ◽  
Winadda Wongwiriyapan ◽  
Chaisak Issro ◽  
Worawut Muangrat ◽  
Weerawut Chaiwat ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spin Coating ◽  
Room Temperature ◽  
Heat Treatments ◽  
Benzene Vapor ◽  
Pristine Mwcnts ◽  
Heat Treated ◽  
Multi Walled Carbon Nanotubes ◽  
The Difference ◽  
Walled Carbon Nanotubes

Effect of acid and heat treatments of multi-walled carbon nanotubes (MWCNTs) on benzene detection was investigated. For acid treatment, MWCNTs were treated by hydrochloric acid (HCl) for 1 h meanwhile other batches of MWCNTs were treated by heating under air ambient at 500°C for 1 h. Pristine, HCl-treated and heat-treated MWCNTs were separately coated with ethyl cellulose (EC) by spin-coating prior to fabrication of three different sensors named as EC/pristine MWCNTs, EC/HCl-MWCNTs and EC/heat-MWCNTs sensors, respectively. Each fabricated sensor was exposed to benzene vapor at room temperature for testing its sensing performance based on an increase in its electrical resistance which was sensitive to benzene vapor. Response of the sensors fabricated from EC/HCl-MWCNTs and EC/heat-MWCNTs were 3.66 and 1.92 times higher than that of EC/pristine MWCNTs, respectively. Sensitivity of all sensors would be attributed to swelling of EC, resulting in loosening of MWCNT network after benzene vapor exposure. In addition, the difference of sensing response of the EC/pristine MWCNTs when compared with those of EC/HCl-MWCNTs and EC/heat-MWCNTs would be ascribed to different crystallinity and functionalization of MWCNTs sidewalls, suggesting that acid and heat treatments of MWCNTs would be promising techniques for improvement of benzene detection.

Synthesis and Characterization of Functionalized Multi-Walled Carbon Nanotubes

2013 ◽  
Vol 307 ◽  
pp. 377-380 ◽  
Author(s):  
Shiuh Chuan Her ◽  
Chun Yu Lai
Keyword(s):  
Carbon Nanotubes ◽  
Nitric Acid ◽  
Volume Ratio ◽  
Synthesis And Characterization ◽  
Pristine Mwcnts ◽  
Multi Walled Carbon Nanotubes ◽  
Emission Microscopy ◽  
Walled Carbon Nanotubes ◽  
Functionalized Mwcnts

Multi-walled carbon nanotubes (MWCNT) were dispersed in a mixture of sulfuric and nitric acid with volume ratio of 3:1. Carboxylic acid-functionalized MWCNTS (MWCNT-COOH) were obtained by oxidation pristine MWCNTs via sonication in sulfuric-nitric acid. Epoxy-based nanocomposites reinforced with MWCNTs with and without functionalization were prepared. Chemical functionalization of MWCNTs by oxidation (MWCNT-COOH) was confirmed by FTIR. The properties of nanocomposites were characterized using scanning emission microscopy (SEM). Experimental results showed that functionalization of MWCNTs improved the dispersion of MWCNTs in epoxy matrix compared to those containing MWCNTs without functionalization.

Multi-Walled Carbon Nanotubes as a Catalyst for Gas-Phase Oxidation of Ethanol to Acetaldehyde

ChemSusChem ◽  
2016 ◽  
Vol 9 (14) ◽  
pp. 1820-1826 ◽  
Author(s):  
Jia Wang ◽  
Rui Huang ◽  
Zhenbao Feng ◽  
Hongyang Liu ◽  
Dangsheng Su
Keyword(s):  
Carbon Nanotubes ◽  
Gas Phase ◽  
Phase Oxidation ◽  
Multi Walled Carbon Nanotubes ◽  
Gas Phase Oxidation ◽  
Walled Carbon Nanotubes ◽  
Oxidation Of Ethanol

Remarkably improved electrochemical hydrogen storage by multi-walled carbon nanotubes decorated with nanoporous bimetallic Fe–Ag/TiO2 nanoparticles

2019 ◽  
Vol 48 (3) ◽  
pp. 898-907 ◽  
Author(s):  
Raziyeh Akbarzadeh ◽  
Mehrorang Ghaedi ◽  
Syamak Nasiri Kokhdan ◽  
Daryoosh Vashaee
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Storage ◽  
Tio2 Nanoparticles ◽  
Storage Capacity ◽  
Hydrogen Storage Capacity ◽  
Pristine Mwcnts ◽  
Electrochemical Hydrogen Storage ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The hydrogen storage capacity of a (0.04)Fe–Ag/TiO2/CNT electrode is 10.94 wt%, which is nearly 5 times higher than pristine MWCNTs.

Improvement in Elastic Modulus of MWCNT/Epoxy Nanocomposites

2013 ◽  
Vol 300-301 ◽  
pp. 1250-1253
Author(s):  
Shiuh Chuan Her ◽  
Chun Yu Lai
Keyword(s):  
Carbon Nanotubes ◽  
Elastic Modulus ◽  
Nitric Acid ◽  
Vibration Test ◽  
Epoxy Nanocomposites ◽  
Pristine Mwcnts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Functionalized Mwcnts ◽  
Free Vibration Test

The effect of multi-walled carbon nanotubes (MWCNT) on the elastic modulus of MWCNT/epoxy nanocomposites was investigated. Carboxylic acid-functionalized MWCNTS (MWCNT-COOH) were obtained by oxidation pristine MWCNTs via sonication in sulfuric-nitric acid. Epoxy-based nanocomposites reinforced with MWCNTs with and without functionalization were prepared. In this work, the elastic modulus of MWCNT reinforced nanocomposite was determined by free vibration test. Experimental results showed that functionalized MWCNTs improved the dispersion of MWCNTs in epoxy matrix leading to the enhancement of elastic modulus compared to those containing MWCNTs without functionalization. Nanocomposites prepared with 1 wt % of MWCNT-COOH exhibited 44 % increase in Young’s modulus.

Synthesis and application of a highly selective molecularly imprinted adsorbent based on multi-walled carbon nanotubes for selective removal of perfluorooctanoic acid

2018 ◽  
Vol 4 (5) ◽  
pp. 689-700 ◽  
Author(s):  
Fengmei Cao ◽  
Lei Wang ◽  
Yiming Yao ◽  
Fengchang Wu ◽  
Hongwen Sun ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Perfluorooctanoic Acid ◽  
Selective Removal ◽  
Aqueous Environment ◽  
Rapid Separation ◽  
Molecularly Imprinted ◽  
Selective Enrichment ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Prepared MWCNTs@MIPs allowed for rapid separation and selective enrichment of PFOA from an aqueous environment.

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