Startseite Technik Effect of various initial concentrations of CTAB on the noncovalent modified graphene oxide (MGNO) structure and thermal stability
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Effect of various initial concentrations of CTAB on the noncovalent modified graphene oxide (MGNO) structure and thermal stability

  • Ferda Mindivan
Veröffentlicht/Copyright: 28. August 2017
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Abstract

Graphene oxide (GO) was prepared by oxidation reaction of graphite (GF) using the Hummers’ method and modified by a cationic surfactant (cetyltrimethylammonium bromide – CTAB) followed by chemical reduction using hydrazine monohydrate (N2H4 × H2O) to obtain MGNO powders. The structural and thermal properties of GO and MGNO powders were studied using zeta potentiometer (ZP), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The results demonstrated that CTAB was successfully grafted onto the surface of the GO through non-covalent modification between CTA+ ions and GO for all MGNO powders. A reasonable improvement in thermal stability of the MGNO powders was also observed. FTIR results showed the successful intercalation of CTA+ ions for all MGNO powders. The optimum concentration of surfactant was found to be 120 mg × l−1 (MGNO-120) by using analysis results. The ease of synthesis of MGNO-120 with both excellent intercalation and thermal stability will greatly facilitate potential applications.

Kurzfassung

Für die in diesem Beitrag beschriebene Studie wurde Graphenoxid (GO) durch Oxidationsreaktion von Graphit (GF) hergestellt, in dem das Hummers-Verfahren angewendet wurde, anschließend wurde dieses mit einem kationischen oberflächenaktiven Stoff (Cetyltrimethylammoniumbromid – CTAB) modifiziert, gefolgt von chemischer Reduktion mittels Hydrazin-Monohydrat (N2H4 × H2O), um MGNO-Pulver zu erhalten. Die strukturellen und die thermischen Eigenschaften der GO- und MGNO-Pulver wurde mittels Zeta Potentiometer (ZP), Fourier-Transformations-Infrarot-Spektroskopie (FTIR), Röntgendiffratometrie (XRD), Rasterelektronenmikroskopie (REM) und Thermogravimetrischer Analyse (TGA) untersucht. Die Ergebnisse zeigen, dass CTAB erfolgreich auf die Oberfläche des GO aufgebracht werden konnte, und zwar durch die nicht-kovalente Modifikation zwischen den CTA+-Ionen und GO bei allen MGNO-Pulvern. Eine angemessene Verbesserung der thermischen Stabilität der MGNO-Pulver wurde ebenfalls beobachtet. Die FTIR-Ergebnisse zeigten die erfolgreiche Zwischeneinlagerung der CTA+-Ionen bei allen MGNO-Pulvern. Die optimale Konzentration des oberflächenaktiven Stoffes wurde basierend auf den Analyseergebnissen mit 120 mg × l−1 (MGNO-120) ermittelt. Die Einfachheit der Synthese von MGNO-120 mit einer exzellenten Zwischeneinlagerung und thermischen Stabilität wird potentielle Anwendungen erheblich erleichtern.


*Correspondence Address, Assistant Prof. Dr. Ferda Mindivan, Department of Technical Programs, Bozuyuk Vocational College, Bilecik S.E. University, Bilecik, 11210, Turkey. E-mail:

Assistant Prof. Dr. Ferda Mindivan, born in 1983, graduated from Ataturk University, Erzurum, Turkey, Department of Chemistry, in 2005. After receiving her PhD degree from the same university in the field of Physical Chemistry in 2013, she is continuing her professional career as Assistant Professor in the Department of Technical programs at Bozuyuk Vocational College, Bilecik S. E. University, Bilecik, Turkey. Her main research interests include polymer matrix composites and their structural, thermal and mechanical characterization.


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Published Online: 2017-08-28
Published in Print: 2017-09-01

© 2017, Carl Hanser Verlag, München

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  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Effect of contact pressure on multiaxial fretting fatigue behavior of Al-Zn-Mg alloy
  5. Effect of various initial concentrations of CTAB on the noncovalent modified graphene oxide (MGNO) structure and thermal stability
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