Advancements in the Rheological Behavior and Practical Applications of Solvent-free Nanofluids
Solvent-free nanofluids are nanomaterials with liquid-like behavior consisting of inorganic or organic nanoparticle cores and a coronal layer anchored on their surface.It is a macroscopically homogeneous system characterized by non-volatility,nanocore dispersion stability,rheological controllability and structural tunability.However,the relationship between the structure of solvent-free nanofluids and the rheology regulation principle is still unclear.In this paper,we reviewed the design principles and preparation strategies of solvent-free nanofluids,analyzed the mechanisms of the restricted dynamics of the coronal layer,strain localization behavior on the liquid-like-solid-like transition and liquid-like shear thinning and solid-like shear yielding behaviors of solvent-free nanofluids in terms of non-homogeneous dynamics and coronal layer molecules conformation and their transformations,and summarized the effects of factors such as the coronal layer molecules,nanonuclei,nucleus-coronal interactions,and the length of coronal layer chains on the rheological behavior of solvent-free nanofluids.The research progress of solvent-free nanofluids in thermal conductivity,lubrication,energy,gas separation,oil-water separation,and biomedicine was introduced.Finally,we discussed the challenges on the application performance and service stability of solvent-free nanofluids,and puts forward the key scientific issues that need to be solved.
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