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Preparation and characterization of carbon nanotubes/monotropic liquid crystal composites

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Abstract.
In this work, we fabricated the composites containing multi-walled carbon nanotubes (MWNTs) and 4-
methoxyphenyl-40-propylbenzoate (MPPB), a monotropic nematic liquid crystal (LC), via ultrasonication.
The nematic phase and thermal stability of the resultant MWNTs/MPPB nanocomposites were
investigated by polarized optical microscopy (POM) and thermogravimetric analyzer (TGA) respectively,
aiming at examining the effect of the dispersion of MWNTs on the MPPB director field and thermal
properties. Because of the weak ability to impose anisotropic order on carbon nanotubes (CNTs) in its
matrix, the nematic domains became disoriented withMWNT loads. From the TGA results, we found that
the MWNTs nearly had no effective barrier effect on the decomposition of the composites. The dispersion
of MWNTs and interfacial interactions between the LC molecules and the CNTs were investigated
through scanning electron microscopy (SEM) and Raman spectroscopy. The experimental results
showed that the electrical conductivity of the nanocomposite was enhanced with the increment of the
concentration of MWNTs. The surface resistance of the composite could fall from 1011 to 104 V (by 7
orders of magnitude), which was favorable for many practical uses, especially in one-way electronic
devices.

Keywords: MWNTs/MPPB nanocomposites, Monotropic nematic phase, Thermal properties, Electrical properties

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Informasi Detail

Judul Seri

Applied Surface Science

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Surface Science 255 (2009) 6589–6592

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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