Synthesis of Water-Soluble Multiwalled Carbon Nanotubes with Grafted Temperature-Responsive Shells by Surface RAFT Polymerization

2005 ◽  
Vol 17 (9) ◽  
pp. 2247-2254 ◽  
Author(s):  
Chun-Yan Hong ◽  
Ye-Zi You ◽  
Cai-Yuan Pan
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Raft Polymerization ◽  
Water Soluble ◽  
Multiwalled Carbon ◽  
Temperature Responsive

Molecularly Imprinted Sensor for Ascorbic Acid Based on Gold Nanoparticles and Multiwalled Carbon Nanotubes

2020 ◽  
Vol 16 (7) ◽  
pp. 905-913
Author(s):  
Youyuan Peng ◽  
Qingshan Miao
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Ascorbic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Ph Value ◽  
Biological Fluids ◽  
Water Soluble ◽  
Multiwalled Carbon ◽  
Experimental Conditions ◽  
Molecularly Imprinted

Background: L-Ascorbic acid (AA) is a kind of water soluble vitamin, which is mainly present in fruits, vegetables and biological fluids. As a low cost antioxidant and effective scavenger of free radicals, AA may help to prevent diseases such as cancer and Parkinson’s disease. Owing to its role in the biological metabolism, AA has also been utilized for the therapy of mental illness, common cold and for improving the immunity. Therefore, it is very necessary and urgent to develop a simple, rapid and selective strategy for the detection of AA in various samples. Methods: The molecularly imprinted poly(o-phenylenediamine) (PoPD) film was prepared for the analysis of L-ascorbic acid (AA) on gold nanoparticles (AuNPs) - multiwalled carbon nanotubes (MWCNTs) modified glass carbon electrode (GCE) by electropolymerization of o-phenylenediamine (oPD) and AA. Experimental parameters including pH value of running buffer and scan rates were optimized. Scanning electron microscope (SEM), fourier-transform infrared (FTIR) spectra, cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were utilized for the characterization of the imprinted polymer film. Results: Under the selected experimental conditions, the DPV peak currents of AA exhibit two distinct linear responses ranging from 0.01 to 2 μmol L-1 and 2 to 100 μmol L-1 towards the concentrations of AA, and the detection limit was 2 nmol L-1 (S/N=3). Conclusion: The proposed electrochemical sensor possesses excellent selectivity for AA, along with good reproducibility and stability. The results obtained from the analysis of AA in real samples demonstrated the applicability of the proposed sensor to practical analysis.

Synthesis and characterization of water-soluble multiwalled carbon nanotubes grafted by a thermoresponsive polymer

2006 ◽  
Vol 17 (10) ◽  
pp. 2458-2465 ◽  
Author(s):  
Guoyong Xu ◽  
Wei-Tai Wu ◽  
Yusong Wang ◽  
Wenmin Pang ◽  
Pinghua Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Thermoresponsive Polymer ◽  
Multiwalled Carbon

Surface Modification of Multiwalled Carbon Nanotubes with Engineered Self-Assembled RAFT Diblock Coatings

2014 ◽  
Vol 67 (1) ◽  
pp. 151 ◽  
Author(s):  
Yue Liu ◽  
Xiaojuan Hao ◽  
Lynne J. Waddington ◽  
Jieshan Qiu ◽  
Timothy C. Hughes
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrostatic Interactions ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Dispersion Stability ◽  
Multiwalled Carbon ◽  
Molecular Weights ◽  
Poly Ethylene ◽  
Positively Charged

A facile method to modify the surface of multiwalled carbon nanotubes (MWCNTs) via electrostatic interactions between polyelectrolytes and oxidized MWCNTs was developed. Diblock copolymers containing poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMETAC), a positively charged block, and poly(ethylene glycol) methacrylate (PEGMA), a neutral block, with tailored molecular weights and low polydispersities were synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. Acid treated-MWCNTs were coated with the RAFT diblock copolymers to improve their dispersibility in aqueous phosphate buffered saline (PBS) solution. The short positively charged PMETAC block was designed to attach the block copolymers to the surface of MWCNTs via electrostatic interactions, whereas the PEGMA block improved dispersibility of the MWCNTs in aqueous solutions. Extensive screening of the diblock copolymers with different degrees of polymerization (DP) showed that the dispersion stability of the polymer-coated MWCNTs in PBS was greatly improved with increasing chain length of the PEGMA block. In particular, the MWCNTs coated with a diblock copolymer containing PEGMA (DP = 118, the longest block investigated) showed superior dispersion stability in both water and PBS solution.

Matrix-grafted multiwalled carbon nanotubes/poly(methyl methacrylate) nanocomposites synthesized by in situ RAFT polymerization: A kinetic study

2012 ◽  
Vol 44 (8) ◽  
pp. 555-569 ◽  
Author(s):  
Saeid Rahimi-Razin ◽  
Vahid Haddadi-Asl ◽  
Mehdi Salami-Kalajahi ◽  
Farid Behboodi-Sadabad ◽  
Hossein Roghani-Mamaqani
Keyword(s):  
Carbon Nanotubes ◽  
Methyl Methacrylate ◽  
Kinetic Study ◽  
Multiwalled Carbon Nanotubes ◽  
Raft Polymerization ◽  
Multiwalled Carbon ◽  
Poly Methyl Methacrylate

Aggregation and stabilization of multiwalled carbon nanotubes in aqueous suspensions: influences of carboxymethyl cellulose, starch and humic acid

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 67260-67270 ◽  
Author(s):  
Wen Liu ◽  
Xiao Zhao ◽  
Zhengqing Cai ◽  
Bing Han ◽  
Dongye Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Organic Matter ◽  
Humic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Natural Organic Matter ◽  
Carboxymethyl Cellulose ◽  
Soluble Starch ◽  
Water Soluble ◽  
Multiwalled Carbon ◽  
Leonardite Humic Acid

Aggregation and stability of multiwalled carbon nanotubes in aqueous solutions were investigated with two polysaccharide stabilizers (carboxymethyl cellulose and a water soluble starch) and a natural organic matter (leonardite humic acid).

scholarly journals Preparation, Characterization, andIn VitroandVivoAntitumor Activity of Oridonin-Conjugated Multiwalled Carbon Nanotubes Functionalized with Carboxylic Group

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Chuanjin Wang ◽  
Wei Li
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Tumor Therapy ◽  
Water Soluble ◽  
Carboxylic Group ◽  
Multiwalled Carbon ◽  
Compound C ◽  
Poorly Water Soluble

Carbon nanotubes have shown great potential in tumor therapy. Oridonin (ORI) is a poorly water-soluble diterpenoid compound (C20H28O6) used in the treatment of esophageal and hepatic carcinoma for decades. For the purpose of enhancing the antitumor potency and reducing cytotoxicity of ORI, multiwalled carbon nanotubes functionalized with carboxylic group (MWCNTs-COOH) were used as ORI carrier. ORI was noncovalently encapsulated into (or onto) the functionalized carbon nanotubes (MWCNTs-ORI). The obtained MWCNTs-ORI has been characterized. The ORI loading efficiency in MWCNTs-COOH carrier was studied to be about 82.6% (w/w).In vitrocytotoxicity assay on MWCNTs-ORI gave IC50of7.29±0.5 μg/mL and ORI-F gave IC50of14.5±1.4 μg/mL. The antitumor effect studiesin vivoshowed that MWCNTs-ORI improved antitumor activity of ORI in comparison with ORI-F. The tumor inhibition ratio for MWCNTs-ORI (1.68×10-2 g·Kg−1·d−1) was 86.4%, higher than that of ORI-F (1.68×10-2 g·Kg−1·d−1) which was 39.2%. This can greatly improve the pharmaceutical efficiency and reduce potential side effects.

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