Variation of optical properties, rheology, and microstructure in fullerene/poly(vinyl pyrrolidone) nanofluids with fullerene content in n-butanol

被引:8
作者
Behera, M. [1 ]
Ram, S. [2 ]
机构
[1] Silicon Inst Technol, Dept Chem, Bhubaneswar 751024, Odisha, India
[2] Indian Inst Technol, Ctr Mat Sci, Kharagpur 721302, W Bengal, India
关键词
nanofluids; charge transfer; donor-acceptor interaction; shear thinning; nano-assemblies; C-60; SOLUBILIZATION; NANOPARTICLES; ABSORPTION; COMPLEXES; BEHAVIOR;
D O I
10.1080/1536383X.2015.1130703
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, we report non-linear variation of optical and rheology properties in fullerene (C-60)/poly(vinyl pyrrolidone) (PVP) nanofluids (NFs) with C-60-content (C) in an alcoholic medium. From the absorption spectra, we found that the absorbance maximum ((max)) follows a non-linear path with C-value due to a donor-acceptor PVP C-60 charge transfer in a C-60/PVP complex. The (max) value reaches maximum at a specific C-60-content of 13.9 M due to percolation effect and then starts decreasing with a further increase in C-value over the subsequent region covered in this experiment. Models were proposed to show donor-acceptor interaction between C-60 and PVP. The molar extinction coefficient also drops through a peak maximum at 13.9-mu M C-60. Regardless of the C-values, shear-thinning behavior was found in all NFs. The shear viscosity () value, which decreases with shear rate value over 5 to 100 s(-1), is shown to be increasing non-linearly against the C-value. The -value varies non-linearly with C-60-content and shows a dip at a point near 13.9-mu M C-60. High-resolution transmission electron microscope images reveal that the size of C-60/PVP nano-assemblies increases with C-value as PVP is anchoring C-60 molecules in specific structures.
引用
收藏
页码:154 / 161
页数:8
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