Microwave Absorption Study of Polyaniline Nanocomposites with Different Dimension of Multiwalled Carbon Nanotubes

2016 ◽  
Vol 846 ◽  
pp. 465-470
Author(s):  
Yen Nee Koh ◽  
Nurrafiqah Mokhtar ◽  
Sook Wai Phang
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Structure ◽  
Multiwall Carbon Nanotubes ◽  
Dielectric Permeability ◽  
Chemical Oxidation ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
Multiwalled Carbon ◽  
Magnetization Behavior ◽  
Multiwall Carbon

Polyaniline (PAni) Nanocomposites Containinganiline (Ani) Monomer and Hexanoic Acid (HA) Dopant were Successfullysynthesized by Using Chemical Oxidation Method. Titanium Dioxide (TiO2)and Different Dimension of Multiwall Carbon Nanotubes (MWNT) Have been Added Inorder to Improve the Dielectric Permeability and Magnetic Permittivityproperties of the Pani Nanocomposites. Fourier Transform Infrared (FTIR) Andultraviolet-Visible (UV-Vis) Spectra Confirmed the Chemical Structure of Paninanocomposites. Conductivity and Magnetization Behavior were Investigated Byresistivity Meter and Vibrating Sample Magnetometer (VSM). Microwave Absorptionstudies were Carried out by Microwave Vector Network Analyzer (MVNA) from 0.5to 18 Ghz. among all the Pani Nanocomposites, Pani Nanocomposites with MWNT (D = 10-2- Nm, l = 5-15 μm) Shows Agood Reflection Loss (RL = -58 Db) at 7 Ghz with a Sharp and Narrow Peak due Tohigher Values of Magnetization (0.074 Emu/g) Andmoderate Electrical Conductivity (1.11 x 10-2 S/cm)

scholarly journals Application of Response Surface Methodology for Optimization of Urea Grafted Multiwalled Carbon Nanotubes in Enhancing Nitrogen Use Efficiency and Nitrogen Uptake by Paddy Plants

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Norazlina Mohamad Yatim ◽  
Azizah Shaaban ◽  
Mohd Fairuz Dimin ◽  
Faridah Yusof ◽  
Jeefferie Abd Razak
Keyword(s):  
Carbon Nanotubes ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Nitrogen Uptake ◽  
Plant Nutrition ◽  
Multiwall Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Reflux Time ◽  
Use Efficiency ◽  
Multiwall Carbon

Efficient use of urea fertilizer (UF) as important nitrogen (N) source in the world’s rice production has been a concern. Carbon-based materials developed to improve UF performance still represent a great challenge to be formulated for plant nutrition. Advanced N nanocarrier is developed based on functionalized multiwall carbon nanotubes (f-MWCNTs) grafted with UF to produce urea-multiwall carbon nanotubes (UF-MWCNTs) for enhancing the nitrogen uptake (NU) and use efficiency (NUE). The grafted N can be absorbed and utilized by rice efficiently to overcome the N loss from soil-plant systems. The individual and interaction effect between the specified factors of f-MWCNTs amount (0.10–0.60 wt%) and functionalization reflux time (12–24 hrs) with the corresponding responses (NUE, NU) were structured via the Response Surface Methodology (RSM) based on five-level CCD. The UF-MWCNTs with optimized 0.5 wt% f-MWCNTs treated at 21 hrs reflux time achieve tremendous NUE up to 96% and NU at 1180 mg/pot. Significant model terms (pvalue < 0.05) for NUE and NU responses were confirmed by the ANOVA. Homogeneous dispersion of UF-MWCNTs was observed via FESEM and TEM. The chemical changes were monitored by FT-IR and Raman spectroscopy. Hence, this UF-MWCNTs’ approach provides a promising strategy in enhancing plant nutrition for rice.

Effect of Chemical Oxidation Routes on the Properties of Chitosan- MWCNT Nanocomposites

2019 ◽  
Vol 15 (6) ◽  
pp. 618-625 ◽  
Author(s):  
Alejandro Gomez Sánchez ◽  
Evgen Prokhorov ◽  
Gabriel Luna-Barcenas ◽  
Yuriy Kovalenko ◽  
Eric M. Rivera-Muñoz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Interfacial Layer ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Oxidation ◽  
Surface Groups ◽  
Mechanical Measurements ◽  
Carboxylic Groups ◽  
Functionalized Mwcnts ◽  
Multiwall Carbon

Background: Chitosan-multiwall carbon nanotubes (CS-MWCNTs) nanocomposites are an attractive material due to their biocompatibility and possibility to produce nanocomposites with high conductivities and high mechanical properties. Both electrical and mechanical properties depend upon the method of MWCNT chemical oxidation; this oxidation affects the interaction of CS side groups with MWCNT’s surface groups. However, in the literature, there are no reports on how different methods of MWCNT oxidation will affect the electrical and mechanical properties of related nanocomposites. Objective: The objective of this work is to probe CS-MWCNT nanocomposite’s electrical and mechanical properties by taking advantage of the presence of interfacial layer and its dependence on the methods of MWCNTs chemical oxidation routes. Methods: Nanocomposites are prepared with non-functionalized MWCNT and functionalized MWCNTs obtained by chemical oxidation treatments in HNO3 in H2SO4/NHO3 mixtures and commercially carboxyl-terminated MWCNTs, respectively. Properties of MWCNTs and nanocomposites were evaluated using SEM, FTIR, Raman, TGA, XRD, impedance and mechanical measurements. Results: It was shown that different chemical oxidation routes produce MWCNTs with a different number of carboxylic groups and defects which influence the interaction between MWCNTs with CS matrix and thickness of the interfacial layer between MWCNTs and CS matrix. Additionally, it was shown that the formation of the interfacial layer dominates on the dispersion of MWCNTs and affects on the electrical and mechanical percolation effects. Conclusion: It was shown that contrary to many studies previously reported, good dispersion of MWCNT does not guarantee obtained nanocomposites with the best electrical and mechanical properties.

scholarly journals CORE-TUBE MORPHOLOGY OF MULTIWALL CARBON NANOTUBES

2010 ◽  
Vol 24 (01n02) ◽  
pp. 288-294 ◽  
Author(s):  
MOTOHIRO SATO ◽  
HIROYUKI SHIMA ◽  
KOHTAROH IIBOSHI
Keyword(s):  
Carbon Nanotubes ◽  
Elastic Medium ◽  
Multiwall Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Core Tube ◽  
Cross Sectional ◽  
The Cross ◽  
Sectional Shape ◽  
Strain Model ◽  
Multiwall Carbon

The present paper investigates the cross-sectional morphology of Multiwalled Carbon Nanotubes (MWNTs) restrained radially and circumferentially by an infinite surrounding elastic medium, subjected to uniform external hydrostatic pressure. In this study, a two-dimensional plane strain model is developed, assuming no variation of load and deformation along the tube axis. We find some characteristic cross-sectional shapes from the elastic buckling analysis. The effect of the surrounded elastic medium on the cross-sectional shape which occurs due to pressure buckling is focused on by the comparison with the shape for no elastic medium case in our discussion. It is suggested that in no embedded elastic medium cases, the cross-sectional shapes of inner tubes maintain circle or oval; on the other hand, an embedded medium may cause inner tube corrugation modes especially when the number of shells for MWNTs is small.

Functionalization by Acidic Treatment in the Purification of Multiwalled Carbon Nanotubes (MWCNTs)

2013 ◽  
Vol 685 ◽  
pp. 155-158
Author(s):  
Mohamad Fauzi Ahmad ◽  
Adlan Akram Mohammad Mazuki ◽  
Nurhalawa Md Yusof ◽  
Rosiyah Yahya ◽  
Siti Murni M. Zawawi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwall Carbon Nanotubes ◽  
Deionized Water ◽  
Raw Material ◽  
Reflux Condenser ◽  
Multiwalled Carbon ◽  
Decomposition Products ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Multiwall Carbon

Comparative studies of two multi-walled carbon nanotubes (MWCNT) from different manufacturers were reported. The purification and functionalization of commercial multiwall carbon nanotubes were investigated. MWCNTs were treated with boiling concentrated HNO3 under a reflux condenser for 2 hours at 100 °C in order to purify and oxidize the raw material. The oxidized MWCNTs were rinsed with deionized water until stabilization of the filtrate pH. The measurement technique was by thermogravimetric analysis (TGA) for thermal analysis decomposition products. Meanwhile, the chemical shifted in MWCNTs can be determined by using Raman Spectroscopy.

Research of Electromagnetic Properties of Composite Materials on the Basis of MWNTs in Microwave Range

2014 ◽  
Vol 1040 ◽  
pp. 142-147
Author(s):  
Valentine I. Suslyaev ◽  
Vladimir L. Kuznetsov ◽  
S.I. Moseenkov ◽  
Evgeniy Yu. Korovin ◽  
D.V. Krasnikov
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials ◽  
Structural Parameters ◽  
Multiwall Carbon Nanotubes ◽  
Dielectric Permeability ◽  
Electromagnetic Properties ◽  
Microwave Range ◽  
Multilayer Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Parameters Calculation

In this paper electromagnetic properties of composite materials based on polymethylmethacrylate and multiwall carbon nanotubes (MWCNTs) are investigated. Carbon nanotubes are received with application of various types of catalysts and have various structural parameters. Calculation of dielectric permeability of the synthesised materials is carried out. Dependence of electromagnetic properties of composite materials on concentration and structure used multilayer carbon nanotubes is shown.

Incorporation of Multiwalled Carbon Nanotubes to Ordinary Portland Cement (OPC): Effects on Mechanical Properties

2013 ◽  
Vol 641-642 ◽  
pp. 436-439 ◽  
Author(s):  
Lei Cui
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
High Performance ◽  
Water Solution ◽  
Construction Materials ◽  
Multiwall Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Materials Research ◽  
Cost Of Construction ◽  
Multiwall Carbon

Due to the outstanding mechanical properties, carbon nanotubes (CNTs) are considered to offer the probability to enhance the properties of high-performance cementitious composites，and to reduce ecological cost of construction materials. Recent work in the area of concrete materials research has shown the potentiality of improving concrete properties by adjusting the mic-structure of cement hydrates, addition of nanotubes and controlling the delivery of admixtures. In this study, the multiwall carbon nanotubes (MWCNTs) were effectively dispersed in the water solution by applying ultrasonic energy. The results show that small amount of effectively dispersed MWCNTs can visible increase the strength of the cementitious matrix.

scholarly journals MULTIWALLED CARBON NANOTUBES ENHANCING NITROGEN UPTAKE AND USE EFFICIENCY OF UREA FERTLIZER BY PADDY

2017 ◽  
Vol 79 (5-2) ◽  
Author(s):  
Azizah Shaaban ◽  
Norazlina Mohamad Yatim ◽  
Mohd Fairuz Dimin ◽  
Faridah Yusof ◽  
Jeefferie Abd Razak
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Uptake ◽  
Cropping Systems ◽  
Multiwall Carbon Nanotubes ◽  
Economic Sustainability ◽  
Multiwalled Carbon ◽  
Promising Strategy ◽  
N Source ◽  
Use Efficiency ◽  
Multiwall Carbon

Efficient use of urea fertilizer (UF) as important nitrogen (N) source in the world's rice production has been a concern for the economic sustainability of cropping systems. The use of carbon-based materials to enhance UF efficiency still facing a great challenge. Hence, N Nano-carrier is developed based on functionalized multiwall carbon nanotubes (f-MWCNTs) grafted with UF to produce urea-multiwall carbon nanotubes (UF-MWCNTs) for enhancing the nitrogen uptake (NU) and use efficiency (NUE). The grafted N was found efficiently absorbed and utilized by rice, and overcome the N propensity for loss from soil‐plant systems when UF-MWCNTs are applied. The UF-MWCNTs shown tremendous NUE up to 96% and NU at 1180mg/pot. The chemical changes were monitored by Raman spectroscopy. Hence, UF-MWCNTs provides a promising strategy in enhancing plant nutrition for rice.

Simultaneous Detection of Hydroquinone and Catechol Using Platinum Nanoparticles Decorated Graphene/Poly-Cyclodextrin/Multiwalled Carbon Nanotubes (MWCNTs) Nanocomposite Based Biosensor

2018 ◽  
Vol 18 (12) ◽  
pp. 8118-8123 ◽  
Author(s):  
Xiaomei Huang ◽  
Xiang Deng ◽  
Wenjing Qi ◽  
Di Wu
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Biosensor ◽  
Simultaneous Detection ◽  
Multiwall Carbon Nanotubes ◽  
Electrochemical Determination ◽  
Multiwalled Carbon ◽  
Platinum Particles ◽  
Pulse Voltammetry ◽  
Multiwall Carbon

Graphene cyclodextrin prepolymer (pre-CD)-multiwall carbon nanotubes (Gr-CDP-MWCNTs) nanocomposites modified on glassy carbon electrode (Gr-CDP-MWCNTs/GCE) are prepared and then platinum particles (PtNPs) are electrodeposited on it. The simultaneous determination of hydroquinone (HQ) and catechol (CC) at PtNPs/Gr-CDP-MWCNTs/GCE is reported in the present work. Synergistic effect of nanomaterials, host-guest chemical reaction ability of CDP, the stacking interaction between detected molecules and Gr-MWCNTs surface are considered as the main reasons of successfully simultaneous detection of HQ and CC. Cyclic voltammetry (CV), scanning electron microscopy (SEM) and different pulse voltammetry (DPV) are employed to characterize the proposed PtNPs/Gr-CDP-MWCNTs electrochemical biosensor. The prepared PtNPs/Gr-CDP-MWCNTs sensor shows linear response ranges of 0.05–27.2 μM and 0.1–27.2 μM and have low detection limits (S/N = 3) of 0.015 μM and 0.03 μM for simultaneous electrochemical determination of HQ and CC, respectively. It is also applied for the measurement of HQ and CC in local river water samples with recoveries from 98.0 to 102.0% and from 99.3 to 101.5%.

scholarly journals Effect of Matrix Viscosity on Rheological and Microwave Properties of Polymer Nanocomposites with Multiwall Carbon Nanotubes

2014 ◽  
Vol 44 (2) ◽  
pp. 83-96 ◽  
Author(s):  
R. Kotsilkova ◽  
E. Ivanov ◽  
D. Bychanok ◽  
A. Paddubskaya ◽  
P. Kuzhir
Keyword(s):  
Carbon Nanotubes ◽  
Percolation Threshold ◽  
Multiwall Carbon Nanotubes ◽  
Electromagnetic Shielding ◽  
Microwave Properties ◽  
Multiwalled Carbon ◽  
Low Viscosity ◽  
The Matrix ◽  
Multiwall Carbon ◽  
Rheological Percolation

Abstract Nanocomposites of multiwalled carbon nanotubes (MWCNTs) in epoxy resin and polypropylene (PP) are studied. The effect of matrix viscosity on the degree of dispersion of nanotubes is determined by rheological methods. Rheology and microwave properties are correlated to estimate the optimal limits of nanofiller content required for improving the performance of nanocomposites. Rheological percolation threshold is determined for both types nanocomposites, ϕp=0.27% for the epoxy/MWCNT and; ϕp=1.5% for the PP/MWCNT, as found critical for achieving a network structure of interacting nanotubes in the matrix polymer. Good electromagnetic shielding efficiency was obtained for nanocomposites at nanotube contents above the rheological percolation. Low viscosity matrix facilitates contacts between MWCNTs, resulting in appearance of electromagnetic shielding at very low percolation threshold.

Sign in / Sign up

Export Citation Format

Share Document