Outstanding dielectric constant and piezoelectric coefficient in electrospun nanofiber mats of PVDF containing silver decorated multiwall carbon nanotubes: assessing through piezoresponse force microscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6251-6258 ◽  
Author(s):  
Maya Sharma ◽  
Vijay Srinivas ◽  
Giridhar Madras ◽  
Suryasarathi Bose
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Piezoelectric Coefficient ◽  
Multiwall Carbon Nanotubes ◽  
Piezoresponse Force Microscopy ◽  
Electrospun Nanofiber ◽  
Force Microscopy ◽  
Nanofiber Mats ◽  
Multiwall Carbon

Alignment of dipoles in one direction leads to high piezoelectric coefficient in PVDF/Ag decorated CNTs.

Studies of Multiwall Carbon Nanotubes Using Raman Spectroscopy and Atomic Force Microscopy

2004 ◽  
Vol 99-100 ◽  
pp. 265-268 ◽  
Author(s):  
M. Zdrojek ◽  
W. Gebicki ◽  
C. Jastrzebski ◽  
T. Melin ◽  
A. Huczko
Keyword(s):  
Carbon Nanotubes ◽  
Low Frequency ◽  
Multiwall Carbon Nanotubes ◽  
Radial Breathing Mode ◽  
Force Microscopy ◽  
Disorder Effects ◽  
Atomic Force ◽  
New Feature ◽  
Single Wall Nanotubes ◽  
Multiwall Carbon

Preliminary results of Raman scattering measurements of multiwall carbon nanotubes (MWCNT) are presented. The nanotubes have been carefully dissolved, separated and then characterized by AFM. The micro-Raman spectra are taken with 514,5nm wavelength excitations in the range 4K - 400K. Basically the spectra are quite similar to the well known single wall carbon nanotube spectra, but the low frequency band is absent. The major Raman bands, observed in single wall nanotubes are found in the spectra. In particular the disorder effects are visible due to the pronounced D band at ~1350 cm-1. Metallic and semiconducting type of conductivity is distinguished through analysis of the G (LO) mode at ~1600 cm-1. A new feature in these spectra exists at ~843 cm-1. Low energy radial breathing mode absence has been explained.

scholarly journals Improvement of the electromechanical properties of thermoplastic polyurethane composite by ionic liquid modified multiwall carbon nanotubes

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 166-178
Author(s):  
Qianwei Xu ◽  
Weijia Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Ionic Liquid ◽  
Elastic Modulus ◽  
Thermoplastic Polyurethane ◽  
Multiwall Carbon Nanotubes ◽  
Electromechanical Properties ◽  
Polyurethane Composite ◽  
Blending Method ◽  
Multiwall Carbon

Abstract Carbon nanotubes (CNTs) were non-covalently modified by two categories of ionic liquids (ILs), including 1-vinyl-3-ethylimidazole bromide (VEIMBr) and 1-vinyl-3-hexylimidazole bromide (VHIMBr) in the ratio of 1:1 and 1:4, respectively. The surface interaction between CNTs and ILs was well-characterized by FTIR, Raman spectra, XPS, etc. Thermoplastic polyurethane (TPU) containing different amounts of CNTs/ILs was fabricated by melting blending method. TPU-CNTs/ILs composites exhibited simultaneously enhanced electromechanical properties with improved dielectric constant and lowered elastic modulus. The electromechanical sensitivity of sample TPU-3CNT/12VHIMBr increased by approximately 45 times in comparison with that of pure TPU at 200 Hz. Besides, improved dispersion of CNTs/ILs in the TPU matrix was also exhibited.

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

scholarly journals Comparative study of using Water-Based mud containing Multiwall Carbon Nanotubes versus Oil-Based mud in HPHT fields

2016 ◽  
Vol 25 (4) ◽  
pp. 459-464 ◽  
Author(s):  
M.I. Abduo ◽  
A.S. Dahab ◽  
Hesham Abuseda ◽  
Abdulaziz M. AbdulAziz ◽  
M.S. Elhossieny
Keyword(s):  
Carbon Nanotubes ◽  
Comparative Study ◽  
Multiwall Carbon Nanotubes ◽  
Water Based ◽  
Multiwall Carbon
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