scholarly journals Construction of Multiple Switchable Sensors and Logic Gates Based on Carboxylated Multi-Walled Carbon Nanotubes/Poly(N,N-Diethylacrylamide)

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3358 ◽  
Author(s):  
Xuemei Wu ◽  
Xiaoqing Bai ◽  
Yang Ma ◽  
Jie Wei ◽  
Juan Peng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Logic Gate ◽  
Logic Gates ◽  
Present System ◽  
Ph Responsive ◽  
Cyclic Voltammetric ◽  
Computing Systems ◽  
Multi Walled Carbon Nanotubes ◽  
Gate System ◽  
Walled Carbon Nanotubes

In this work, binary hydrogel films based on carboxylated multi-walled carbon nanotubes/poly(N,N-diethylacrylamide) (c-MWCNTs/PDEA) were successfully polymerized and assembled on a glassy carbon (GC) electrode surface. The electroactive drug probes matrine and sophoridine in solution showed reversible thermal-, salt-, methanol- and pH-responsive switchable cyclic voltammetric (CV) behaviors at the film electrodes. The control experiments showed that the pH-responsive property of the system could be ascribed to the drug components of the solutions, whereas the thermal-, salt- and methanol-sensitive behaviors were attributed to the PDEA constituent of the films. The CV signals particularly, of matrine and sophoridine were significantly amplified by the electrocatalysis of c-MWCNTs in the films at 1.02 V and 0.91 V, respectively. Moreover, the addition of esterase, urease, ethyl butyrate, and urea to the solution also changed the pH of the system, and produced similar CV peaks as with dilution by HCl or NaOH. Based on these experiments, a 6-input/5-output logic gate system and 2-to-1 encoder were successfully constructed. The present system may lead to the development of novel types of molecular computing systems.

pH Responsive Release of Doxorubicin to the Cancer Cells by Functionalized Multi-Walled Carbon Nanotubes

2015 ◽  
Vol 15 (7) ◽  
pp. 4799-4805 ◽  
Author(s):  
B. Anbarasan ◽  
S. Vignesh Babu ◽  
K. Elango ◽  
B. Shriya ◽  
S. Ramaprabhu
Keyword(s):  
Carbon Nanotubes ◽  
Cancer Cells ◽  
Ph Responsive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

pH-Switchable electroactive composite films of carboxylated multi-walled carbon nanotubes and Prussian blue

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103184-103188
Author(s):  
Ying Tong ◽  
Yuanyuan Wang ◽  
Bowen Gao ◽  
Lei Su ◽  
Xueji Zhang
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Prussian Blue ◽  
Composite Films ◽  
Ph Responsive ◽  
Composite Thin Films ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Here the combination of carboxylated multi-walled carbon nanotubes (CMWCNTs) and Prussian blue (PB) for fabricating pH-responsive electroactive composite thin films is reported.

scholarly journals Combining Carbon Nanotubes and Chitosan for the Vectorization of Methotrexate to Lung Cancer Cells

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2889 ◽  
Author(s):  
Giuseppe Cirillo ◽  
Orazio Vittorio ◽  
David Kunhardt ◽  
Emanuele Valli ◽  
Florida Voli ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Ph Responsive ◽  
Carbon Nanostructure ◽  
X Ray ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Responsive Behavior ◽  
Walled Carbon Nanotubes

A hybrid system composed of multi-walled carbon nanotubes coated with chitosan was proposed as a pH-responsive carrier for the vectorization of methotrexate to lung cancer. The effective coating of the carbon nanostructure by chitosan, quantified (20% by weight) by thermogravimetric analysis, was assessed by combined scanning and transmission electron microscopy, and X-ray photoelectron spectroscopy (N1s signal), respectively. Furthermore, Raman spectroscopy was used to characterize the interaction between polysaccharide and carbon counterparts. Methotrexate was physically loaded onto the nanohybrid and the release profiles showed a pH-responsive behavior with higher and faster release in acidic (pH 5.0) vs. neutral (pH 7.4) environments. Empty nanoparticles were found to be highly biocompatible in either healthy (MRC-5) or cancerous (H1299) cells, with the nanocarrier being effective in reducing the drug toxicity on MRC-5 while enhancing the anticancer activity on H1299.

Enhanced Sensitivity of Electrochemical Biosensor on Microfluidic Paper Based Analytical Device Using Zno/MWCNTS Nanocomposite

2019 ◽  
Vol 9 (02) ◽  
Author(s):  
Roekmono . ◽  
Harsono Hadi1 ◽  
Luthviyah Choirotul Muhimmah1 ◽  
Ruri Agung Wahyuono ◽  
Hilya Nur Imtihani ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ascorbic Acid ◽  
Electrochemical Biosensor ◽  
Glucose Measurement ◽  
Present System ◽  
Current Response ◽  
Enhanced Sensitivity ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Analytical Device

This paper presents an integrated ZnO/multi-walled carbon nanotubes (MWCNTs) electrode in novel stacking paper-based microfluidic analytical device for electrochemical biosensor. The designed sensors were subjected to detect glucose and ascorbic acid in a simulated body fluid using electrochemical methods, including cyclic voltammetry and impedance spectroscopy. The composite of ZnO/multi-walled carbon nanotubes (MWCNTs) with variations in mass fractions of 0.1, 0.5, 1, 2, 4 and 8% MWCNTs for measuring ascorbic acid and glucose with concentrations spanning from 0.02 to 5.12mM. The best results are obtained by 2% of MWCNTs in composited electrode, in which linear characteristics (R2>0.8) of the current response value show a sensitivity (gradient) of 0.017 and 0.085 µA/mM.cm2 for ascorbic acid and glucose measurement, respectively. The electrochemical detection by means of impedance spectra shows a linearly decreasing trend of chemical capacitance with increasing concentration of glucose and ascorbic acid. However, in the present system it is not sufficient to specifically distinguish the frequency response associated to glucose and ascorbic acid.

scholarly journals Design of a pH-Responsive Conductive Nanocomposite Based on MWCNTs Stabilized in Water by Amphiphilic Block Copolymers

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1410 ◽  
Author(s):  
den Hoed ◽  
Pucci ◽  
Picchioni ◽  
Raffa
Keyword(s):  
Carbon Nanotubes ◽  
Block Copolymers ◽  
Acrylic Acid ◽  
Zeta Potential ◽  
Amphiphilic Block Copolymers ◽  
Ph Responsive ◽  
Potential Applications ◽  
Multi Walled Carbon Nanotubes ◽  
Responsive Behavior ◽  
Walled Carbon Nanotubes

Homogeneous water dispersions of multi-walled carbon nanotubes (MWCNTs) were prepared by ultrasonication in the presence of an amphiphilic polystyrene-block-poly(acrylic acid) (PS-b-PAA) copolymer. The ability of PS-b-PAA to disperse and stabilize MWCTNs was investigated by UV-vis, SEM and zeta potential. The results show that the addition of a styrene block to PAA enhances the dispersion efficiency of the graphitic filler compared to pure PAA, possibly due to the nanotube affinity with the polystyrene moiety. Notably, the dispersions show an evident pH-responsive behavior, being MWCNTs reaggregation promoted in basic environment. It is worth noting that the responsive character is maintained in solid composites obtained by drop casting, thus indicating potential applications in sensing.

Electrocatalytic Oxidation of Hydroxylamine at Electro-Polymerized Poly(cobalt(II) tetraaminophthalocyanine)/Multi Walled Carbon Nanotubes Modified Electrode

2011 ◽  
Vol 301-303 ◽  
pp. 1347-1350 ◽  
Author(s):  
Xiao Ping Hong ◽  
Yan Zhu ◽  
Jing Ying Ma
Keyword(s):  
Carbon Nanotubes ◽  
Modified Electrode ◽  
Electrocatalytic Oxidation ◽  
Catalytic Performance ◽  
Cyclic Voltammograms ◽  
Cyclic Voltammetric ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Linear Concentration Range ◽  
Linear Concentration

This work describes the electrochemical deposition of poly(cobalt(II)-tetraaminophthalocyanine) (poly(CoIITAPc)) film onto a multi walled carbon nanotubes (MWNT) modified glassy carbon (GC) electrode (designated as poly(CoIITAPc)-MWNT-GC electrode) by cyclic voltammetric method and the effectiveness poly(CoIITAPc)-MWNT-GC electrode towards electrocatalytic oxidation of hydroxylamine. Cyclic voltammograms recorded during electropolymerization of cobalt(II) tetraaminophthalocyanine (CoIITAPc) indicated that good adherent layer of poly(CoIITAPc) was incorporated on to the surface of MWNT/GC electrode. The electrochemical detection of hydroxylamine was studied by amperometry at the new poly(CoIITAPc)-MWNT-GC electrode. The modified electrode exhibited good catalytic performance for the electrochemical oxidation of hydroxylamine with an anodic potential of 0.2 V, linear concentration range from 1.7 mmol/L to 0.20 mmol/Land a detection limit of 0.33 mmol/L.

Preparation of poly(styrene-alt-maleic anhydride) grafted multi-walled carbon nanotubes for pH-responsive release of doxorubicin

2017 ◽  
Vol 654 (1) ◽  
pp. 181-189 ◽  
Author(s):  
Cuong M. Q. Le ◽  
Xuan Thang Cao ◽  
Dong Woo Kim ◽  
Uk Hyeon Ban ◽  
Sang Ho Lee ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Maleic Anhydride ◽  
Ph Responsive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled Carbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings

Acta Naturae ◽  
2011 ◽  
Vol 3 (1) ◽  
pp. 99-106 ◽  
Author(s):  
E A Smirnova ◽  
A A Gusev ◽  
O N Zaitseva ◽  
E M Lazareva ◽  
G E Onishchenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Plant Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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