Ionic Liquid as Dispersing Agent of LDH-Carbon Nanotubes into a Biodegradable Vinyl Alcohol Polymer

A Zn/Al layered double hydroxides (LDHs) hosting carbon nanotubes (80% of CNTs) was synthesized and dispersed into a commercial biodegradable highly amorphous vinyl alcohol polymer at different loading (i.e., 1; 3; 5; 10 wt %). In order to improve the degree of dispersion of the filler into the polymer matrix, an ionic liquid (IL) based on 1-hexadecyl-3-methylimidazolium dimethyl-5-sodiosulfoisophthalate was added to the composites’ mixtures. Structural characterization of filler and polymeric composites was carried out. The analysis of thermal, mechanical and electrical properties of the composites, resulted improved compared to the unfilled material, allowed to hypothesize a good dispersion of the LDH-CNTs lamellar filler into the polymer matrix-assisted by the ionic liquid. This was demonstrated comparing electrical conductivity of composite at 5% of LDH-CNTs in the presence and in the absence of IL. The experimental results showed that the electrical conductivity of the sample with IL is four orders of magnitude higher than the one without IL. Furthermore, the percolation threshold of the whole system resulted very low—0.26% of LDH-CNTs loading, which is 0.21% of CNTs.

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Electrically Conductive Nanocomposites Polymer of Poly(Vinyl Alcohol)/Glutaraldehyde/Multiwalled Carbon Nanotubes: Preparation and Characterization

Indonesian Journal of Chemistry ◽

10.22146/ijc.26620 ◽

2018 ◽

Vol 18 (3) ◽

pp. 383 ◽

Cited By ~ 1

Author(s):

Fitri Khoerunnisa ◽

Hendrawan Hendrawan ◽

Yaya Sonjaya ◽

Rizki Deli Hasanah

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Polymer Matrix ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

X Ray Diffraction ◽

Multiwalled Carbon ◽

Electrically Conductive ◽

X Ray ◽

Conductive Nanocomposites

Electrically conductive nanocomposites polymer of poly(vinyl alcohol)/PVA, glutaraldehyde (GA) and multiwalled carbon nanotubes (MWCNT) has been successfully synthesized. The polymer nanocomposites were prepared by mixing PVA, GA (crosslinker), and MWCNT dispersion with an aid of ultrasonic homogenizer at 50 °C. The content of MWCNT, in particular, was varied in order to determine the effect of MWCNT on electrical conductivity of polymer composites. The polymer mixture was casted into a disc to obtain thin film. The electrical conductivity, surface morphology, and mechanical properties of the composites film were investigated by means of four probes method, FTIR spectroscopy, X-ray diffraction, SEM, AFM, and tensile strength measurement, respectively. It was found that the optimum composition of PVA (10%): GA (1%): MWCNT (1%) was 20:20:3 in volume ratio. The addition of MWCNT induced the electrically conductive network on polymer matrix where the electrical conductivity of nanocomposites film significantly increased up to 8.28 x 10-2 S/sq due to reduction of the contact resistance between conductive filler. Additionally, the mechanical strength of nanocomposites polymer were significantly increased as a result of MWCNT addition. Modification of morphological structure of composite film as indicated by FTIR spectra, X-ray diffraction patterns, SEM, and AFM images verified the effective MWCNT filler network in the polymer matrix.

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Synthesis and Characterization of Poly(2,5-benzimidazole) (ABPBI) Grafted Carbon Nanotubes

MRS Proceedings ◽

10.1557/proc-1240-ww09-02 ◽

2009 ◽

Vol 1240 ◽

Cited By ~ 1

Author(s):

Ji-Ye Kang ◽

Su-Mi Eo ◽

Loon-Seng Tan ◽

Jong-Beom Baek

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Interfacial Adhesion ◽

Synthesis And Characterization ◽

Acylation Reaction ◽

Single Walled Carbon Nanotube ◽

Mechanical And Electrical Properties ◽

Multi Walled Carbon Nanotube

AbstractSingle-walled carbon nanotube (SWCNT) and multi-walled carbon nanotube (MWCNT) were functionalized with 3,4-diaminobenzoic acid via “direct” Friedel-Crafts acylation reaction in PPA/P2O5 to afford ortho-diamino-functionalized SWCNT (DIF-SWCNT) and MWCNT (DIF-MWCNT). The resultant DIF-SWCNT and DIF-MWCNT showed improved solubility and dispersibility. To improve interfacial adhesion between CNT and polymer matrix, the grafting of ABPBI onto the surface of DIF-SWCNT (10 wt%) or DIF-MWCNT (10 wt%) was conducted by simple in-situ polymerization of AB monomer, 3,4-diaminobenzoic acid dihydrochloride, in PPA. The resultant ABPBI-g-MWCNT and ABPBI-g-SWCNT showed improved the mechanical and electrical properties.

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Preparation and Characterization of Porous Si-Coated SiC Fiber Media

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.233 ◽

2004 ◽

Vol 449-452 ◽

pp. 233-236 ◽

Cited By ~ 1

Author(s):

Jun Suh Yu ◽

B.S. Lee ◽

Sung Churl Choi ◽

Ji Hun Oh ◽

Jae Chun Lee

Keyword(s):

Electrical Conductivity ◽

Silicon Content ◽

Porous Si ◽

Electrically Conductive ◽

Electrode Distance ◽

Sic Fiber ◽

Effective Electrical Conductivity ◽

The One ◽

Fiber Preforms

Electrically conductive porous Si/SiC fiber media were prepared by infiltration of liquid silicon into porous carbon fiber preforms. The series rule of mixture for the effective electrical conductivity was applied to the disc shaped samples to estimate their silicon content, effective electrical conductivity and porosity. The electrical conductivity was estimated by assuming the disc sample as a plate of equivalent geometry, i.e., same thickness, electrode distance and volume. As the volumetric content of silicon in a sample increases from 0.026% to 0.97%, the estimated electrical conductivity increases from 0.17 S/cm to 2.09 S/cm. The porosity of the samples measured by Archimedes principle was in the range of 75~83% and 1~4% less than the one estimated by the series rule of mixture for the effective electrical conductivity.

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Efficient pseudo five-component synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives promoted by a novel ionic liquid catalyst

Zeitschrift für Naturforschung B ◽

10.1515/znb-2017-0179 ◽

2018 ◽

Vol 73 (3-4) ◽

pp. 191-195 ◽

Cited By ~ 2

Author(s):

Zahra Abshirini ◽

Abdolkarim Zare

Keyword(s):

Ionic Liquid ◽

Disulfonic Acid ◽

Thermal Gravimetric ◽

One Pot ◽

Mild Conditions ◽

Acidic Ionic Liquid ◽

Brønsted Acidic Ionic Liquid ◽

The One ◽

C Nmr

AbstractIn this research, initial production and characterization of a novel Brønsted-acidic ionic liquid, namely,N,N,N′,N′-tetramethylethylenediaminium-N,N′-disulfonic acid hydrogen sulfate ([TMEDSA][HSO4]2), has been described (characterization was achieved using Fourier-transform infrared spectroscopy,1H nuclear magnetic resonance (NMR),13C NMR, and mass and thermal gravimetric spectra). Thereafter, utilization of [TMEDSA][HSO4]2as a highly effectual catalyst for the synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) derivatives through the one-pot pseudo five-component reaction of phenylhydrazine (2 eq.) with ethyl acetoacetate (2 eq.) and arylaldehydes (1 eq.) in relatively mild conditions, has been reported.

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Nanomeasurements of individual carbon nanotubes by in situ TEM

Pure and Applied Chemistry ◽

10.1351/pac200072010209 ◽

2000 ◽

Vol 72 (1-2) ◽

pp. 209-219 ◽

Cited By ~ 65

Author(s):

Z. L. Wang ◽

P. Poncharal ◽

W. A. de Heer

Keyword(s):

Carbon Nanotubes ◽

Complete Characterization ◽

Atomic Scale ◽

In Situ Tem ◽

Mechanical And Electrical Properties ◽

Novel Approach ◽

Transmission Electron ◽

Electron Field

Property characterization of nanomaterials is challenged by the small size of the structure because of the difficulties in manipulation. Here we demonstrate a novel approach that allows a direct measurement of the mechanical and electrical properties of individual nanotube-like structures by in situ transmission electron microscopy (TEM). The technique is powerful in a way that it can be directly correlated to the atomic-scale microstructure of the carbon nanotube with its physical properties, thus providing a complete characterization of the nanotube. Applications of the technique will be demonstrated in measurements of the mechanical properties, the electron field emission, and the ballistic quantum conductance of individual carbon nanotubes. A nanobalance technique is demonstrated that can be applied to measure the mass of a single tiny particle as light as 22 fg (1 f = 10-15 ).

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Terahertz electrical conductivity and optical characterization of composite nonaligned single- and multiwalled carbon nanotubes

Journal of Nanophotonics ◽

10.1117/1.jnp.8.083099 ◽

2014 ◽

Vol 8 (1) ◽

pp. 083099 ◽

Cited By ~ 17

Author(s):

Ehsan Dadrasnia ◽

Sujitha Puthukodan ◽

Horacio Lamela

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Multiwalled Carbon Nanotubes ◽

Optical Characterization ◽

Multiwalled Carbon

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Damage Mechanics of Carbon Nanotubes

Journal of Energy and Power Technology ◽

10.21926/jept.2102021 ◽

2020 ◽

Vol 03 (02) ◽

pp. 1-1

Author(s):

George Z. Voyiadjis ◽

◽

Peter I. Kattan ◽

Keyword(s):

Carbon Nanotubes ◽

Damage Mechanics ◽

Three Dimensional ◽

Damage Variable ◽

Dimensional Case ◽

Third Order ◽

Cross Sectional ◽

Energy Equivalence ◽

The One

A robust mathematical method for the characterization of damage in carbon nanotubes is presented the presentation here is limited to elasticity. In this regard, the second and third order elastic stiffnesses are employed. All this is based on damage mechanics. The hypotheses of elastic strain equivalence and elastic energy equivalence are utilized. A new damage variable is proposed that is defined in terms of the surface area. This is in contrast to the classical damage variable which is defined in terms of the cross-sectional area. In the presentation, both the one-dimensional case (scalars) and the three-dimensional case (tensors) are illustrated.

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