The influence of particle size and multi-walled carbon nanotube on physical properties of mineral trioxide aggregate

Poly(vinylidene fluoride)(PVDF)/Multi-walled carbon nanotube (MWNT) composites were melt blended using internal mixer. The relationships between structures and physical properties of thin PVDF/MWNT composite films were studied. With increasing the content of MWNT, the size of spherulites in PVDF decreased. MWNT was used as a nucleating agent. The incorporation of MWNT produced a polar β-form crystal structure of PVDF. The permittivities of thin PVDF/MWNT composite films were increased with increasing the MWNT content. The percolation level in electrical conductivity occurred between 2 and 2.5 wt%. The critical conductivity saturation point for the electrical conductivity in PVDF was confirmed. Similar tendency was also observed in thermal conductivity.

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Effect of multi walled carbon nanotube (MWCNT) and mixing conditions on unsaturated polyester (UP) physical properties

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/432/1/012048 ◽

2018 ◽

Vol 432 ◽

pp. 012048 ◽

Cited By ~ 1

Author(s):

V Prawitasari ◽

O Ujianto ◽

A L Juwono

Keyword(s):

Carbon Nanotube ◽

Physical Properties ◽

Unsaturated Polyester ◽

Mixing Conditions ◽

Multi Walled Carbon Nanotube

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Influence of Melting of Transition Metal Oxides on the Morphology of Carbon Nanostructures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.585.159 ◽

2012 ◽

Vol 585 ◽

pp. 159-163 ◽

Cited By ~ 1

Author(s):

Malay Jana ◽

Anjan Sil ◽

Subrata Ray

Keyword(s):

Particle Size ◽

Carbon Nanotube ◽

Transition Metal ◽

Flow Rate ◽

Doping Level ◽

Oxide Catalysts ◽

Carbon Nanostructure ◽

Nanostructure Materials ◽

Multi Walled Carbon Nanotube

Different types of carbon nanostructure materials have been grown on nano-sized transition metal oxide based catalyst particles by catalytic chemical vapour deposition. The present investigation reveals an important role of melting or surface melting of oxide catalysts for the growth of carbon nanostructure materials. In the reducing environment prevailing during the growth of nanostructures, oxide catalysts are reduced to metals, which may act as a template for the growth of carbon nanostructure materials. Flow rate of acetylene gas is crucial in catalyzing the growth, as high flow rate of acetylene may cover the catalyst particles with a layer of decomposed carbon, rendering the particles incapable of playing the role of catalyst. The size of the catalyst and the extent of melting, determined primarily by the extent of doping, are important in deciding whether the conditions are favourable for the growth of multi walled carbon nanotube, nanofiber or other nanostructures. Smaller particle size and low doping level favour the growth of multi walled carbon nanotube while growth of nanofiber is commonly observed with larger particles and higher doping level. The size (i.e. diameter) of the nanostructures growing around the catalyst is proportional to the particle size of the catalyst.

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