Silver Nanowires Contained Nanofluids with Enhanced Optical Absorption and Thermal Transportation Properties

Abstract

Two kinds of silver nanowires (100 nm in diameter, 20 μm and 100 μm in length) are prepared. The thermo‐physical characteristics, viscosity, and photothermal conversion performance of the silver nanowires (AgNWs) contained ethylene glycol nanofluids are investigated in detail. It is found that thermal conductivity of 100 μm AgNWs contained nanofluids is higher than that of 20 μm AgNWs with the same diameters of 100 nm. Viscosity test shows that the nanofluid is a Newtonian fluid, and the longer silver nanowires, the greater viscosity. In addition, photothermal conversion efficiency of silver nanowires contained nanofluid is studied. We can observe that the 100 μm AgNWs contained nanofluid has a higher photothermal conversion efficiency than that containing 20 μm AgNWs. Moreover, we find that there is a certain correlation between heat transfer and photothermal conversion of nanofluid. It demonstrates that the high heat transfer property of nanofluid will benefit for its photothermal conversion efficiency and the mechanism is proposed. This work provides a new idea to improve photothermal conversion efficiency. We can choose materials with high thermal conductivity and strong light absorption ability to enhance the photothermal conversion performance of nanofluids.

Photothermal therapy with regulated Nrf2/NF-κB signaling pathway for treating bacteria-induced periodontitis

“…Notably, the temperature of MPB-BA was higher than that of MPB after 5 min NIR light irradiation (1 W cm −2 ). It has been established that the stronger light absorption ability of photothermal agents was facilitated to enhance their photothermal conversion performance [ 52 ]. Therefore, the higher absorption spectra (300–1000 nm) of MPB-BA than that of MPB at 100 p.p.m.…”

Anticaries Agent Based on Silver Nanoparticles and Fluoride: Characterization and Biological and Remineralizing Effects—An In Vitro Study

“…In the cytotoxicity test, AgF and SDF presented similar cellular viability, causing little damage to the cells. Other experimental solutions with silver nanoparticles in low concentrations were previously tested [ 9 , 16 ] and had no cytotoxicity in human cells [ 25 ]. The silver nanoparticles' biocompatibility to mammals' cells was verified, and the use of it in dental materials was suggested to not cause a threat to human health [ 26 , 27 ].…”

“…Ethylene glycol was used as a solvent [ 29 ] with water as a vehicle. A polyvinylpyrrolidone (PVP) treatment was applied to silver nanoparticles as reducing agent because it influences the aspect ratio of the nanoparticles [ 25 ] and ensures good solution stability. Silver nanoparticles coated with PVP dispersed in colloidal solution keep the nanoparticles in suspension and distant from each other [ 30 ].…”

Ethylene glycol based silver nanoparticles synthesized by polyol process: Characterization and thermophysical profile

“…Nanoparticles with high aspect ratio were obtained with EG and PVP as reducing agent that contributed to a larger enhancement in nanofluid thermal conductivity. The influence of the aspect ratio of the nanoparticles was also considered by Zhu et al [17] who characterized EGS nanofluids where silver nanowires of different lengths were produced with PVP and FeCl 3 .6H 2 O. An enhancement in viscosity and thermal conductivity of the prepared nanofluids was revealed by these authors with a stronger effect of silver nanowires with larger length, 100 µm.…”