Rheological properties of silicon oil-based magnetic fluid with magnetic nanoparticles (MNPs)-multiwalled carbon nanotube (MWNT)

Electrical and rheological properties of nanocomposites based on poly(methyl methacrylate) (PMMA) and multiwalled carbon nanotube (MWCNT) were studied from view points of double percolation by adding crosslinked methyl methacrylate-butadiene-styrene (MBS) copolymer particles to lower percolation threshold concentration of MWCNTs. It was found that the critical concentrations of MWCNTs for the percolation in the nanocomposites decrease and then increase with increasing the MBS contents of the nanocomposites. It is postulated that the addition of MBS at low concentrations results in double percolation of MWCNT and the significant decrease of critical concentration for the percolations. However, adding MBS particles in large amounts results in limited space for the distribution of MWCNTs and less efficient dispersion of the MWCNTs and the increase of the critical concentrations of MWCNTs for the percolations. Rheological properties and change of Tgs reflect large interfacial areas in the well dispersed nanocomposite and were also interpreted to support the speculations for the effects of MBS contents and MWCNT concentrations of PMMA/MWCNT nanocomposites.

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Rheological Properties and Phase Structure of Polypropylene/Polystyrene/Multiwalled Carbon Nanotube Composites

Korea-Australia Rheology Journal ◽

10.1007/s13367-020-0014-5 ◽

2020 ◽

Vol 32 (2) ◽

pp. 153-158

Author(s):

Jaegun Lee ◽

Hyungsu Kim

Keyword(s):

Carbon Nanotube ◽

Rheological Properties ◽

Phase Structure ◽

Multiwalled Carbon Nanotube ◽

Multiwalled Carbon ◽

Nanotube Composites ◽

Carbon Nanotube Composites

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Reduced Graphene Oxide/Multiwalled Carbon Nanotube Composite Decorated with Fe3O4 Magnetic Nanoparticles for Electrochemical Determination of Hydrazine in Environmental Water

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.17379 ◽

2020 ◽

Vol 20 (5) ◽

pp. 3148-3156 ◽

Cited By ~ 2

Author(s):

S. Nehru ◽

Subramanian Sakthinathan ◽

P. Tamizhdurai ◽

Te-Wei Chiu ◽

K. Shanthi

Keyword(s):

Graphene Oxide ◽

Carbon Nanotube ◽

Magnetic Nanoparticles ◽

Reduced Graphene Oxide ◽

Electrochemical Impedance ◽

Limit Of Detection ◽

High Sensitivity ◽

Multiwalled Carbon Nanotube ◽

Multiwalled Carbon ◽

Reduced Graphene

In the present work, a reduced graphene oxide and multiwalled carbon nanotube (RGO/MWCNTFe3O4) composite decorated with Fe3O4 magnetic nanoparticles was prepared as an electrochemical sensor. The surface morphology of the prepared composite was identified by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the GCE/RGO/MWCNT-Fe3O4 electrode were investigated by electrochemical impedance spectroscopy, cyclic voltammetry and amperometry. The GCE/RGO/MWCNT-Fe3O4 electrode exhibited higher electrocatalytic performance towards the oxidation of hydrazine. In the optimal conditions, the GCE/RGO/MWCNT-Fe3O4 electrode showed a wide linear range (0.15–220 μM), low limit of detection (LOD) (0.75 μM), and high sensitivity (2.868 μA μM−1 cm−2). The prepared GCE/RGO/MWCNT-Fe3O4 electrode also had excellent repeatability, selectivity, and reproducibility. The practical application of the electrode was confirmed with various spiked water samples and demonstrated acceptable recovery.

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