Multi-walled carbon nanotube/silver nanoparticles used for thermal transportation

Abstract

A green method was applied to prepare composites of multi-walled carbon nanotubes (MWNTs) decorated with silver nanoparticles (Ag-NPs). MWNTs were functionalized using ball milling technology in the presence of ammonium bicarbonate, and the traditional method of silver mirror was used to decorate MWNTs to obtain Ag/MWNT composite. The obtained Ag/MWNT composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transmission infrared spectroscopy, and Brunauer-Emmet-Teller (BET) surface area analysis. SEM characterization showed that Ag-NPs distributed uniformly on the walls of MWNTs. The content and size of Ag-NPs could be controlled by adjusting the redox time. XRD patterns demonstrated that the Ag-NPs are composed of pure Ag and crystallized well. BET analysis indicated that the specific surface areas of Ag/MWNT decrease with increasing the content of Ag-NPs, and this result is similar to that of the literature. The measurement results of the thermal property showed that the thermal conductivity of the nanofluid containing Ag/MWNT composites was higher than that of nanofluid containing pristine or functionalized MWNTs.

Application of Poly(Acrylic Acid)‐Multiwalled Carbon Nanotube Composite for Enrichment of Rrace Hg(II)

“…The peak at 1 718 cm −1 suggests the presence of stretching CO vibrations arising from carboxylic acids . The peaks at ≈1 660 cm −1 is usually attributed to the carbonyl groups and CC . Comparing to that of MWCNTs, the FT‐IR peaks of PAA‐MWCNTs at ≈1 660 cm −1 is significantly improved, which can be due to the COOH groups in PAA on the surface of PAA‐MWCNTs.…”

“…Smitha et al reported that PAA present typical FT‐IR peaks at ≈3 410, ≈1 720, and ≈1 450 cm −1 , which can be assigned to carbonyl groups, and, respectively. The broad peak at 1 612 cm −1 can be due to the vibrations of carbonyl groups or to skeletal CC aromatic vibrations of MWCNTs . The peak at 1 718 cm −1 suggests the presence of stretching CO vibrations arising from carboxylic acids .…”

Effect of Filler Shape on the Thermal Conductivity of Thermal Functional Composites

“…Chen et al studied the synergistic effects of Ag/MWNT composites on the thermal conductivity of the water-based nanofluids [86]. The measurement results showed that the thermal conductivity of the water-based nanofluids containing Ag/MWNT composites was higher than that of those containing pristine or functionalized MWNTs (Figure 12).…”

Preparation and characterization of multi‐walled carbon nanotubes decorated with silver nanoparticles through ultraviolet irradiation reduction

“…So in the work reported here, we hoped to prepare CNT‐Ag for further application in spinning. To date, a number of authors have reported various methods for the preparation of CNT‐Ag, such as chemical reduction, γ‐irradiation‐induced reduction, high‐temperature reduction, vapor‐phase deposition, etc. However, all of these routes show some disadvantages, such as reducing agent remaining as impurity, expensive equipment cost, high energy consumption and complicated production process.…”