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Experimental and modelling study of the effect of temperature on shear thickening fluids
Tongfei Tian,Gang Rou Peng,Weihua Li,Jie Ding,Masami Nakano 한국유변학회 2015 Korea-Australia rheology journal Vol.27 No.1
This paper is a study of the effect that temperature has on a shear thickening fluid made from ethylene glycol and fumed silica, with 20%-26% weight fractions. Three typical temperatures, ranging from 20oC to 60oC, were selected to study the shear rate dependence of viscosity. The temperature tests showed that a high temperature increased the critical shear rate and lowered the shear thickening ratio. A viscosity function was proposed to represent the three characteristic regions in typical shear thickening fluid and to predict viscosity at different temperatures
Comparison of rheological behaviors with fumed silica-based shear thickening fluids
Alain D Moriana,Tongfei Tian,Vitor Sencadas,Weihua Li 한국유변학회 2016 Korea-Australia rheology journal Vol.28 No.3
Shear thickening fluids (STFs) of differing compositions were fabricated and characterised in order to observe the effect of varying chemical and material properties on the resultant rheological behavior. Steady shear tests showed that for a given carrier fluid and particle size exists an optimum weight fraction which exhibits optimal shear thickening performance. Testing also showed that increasing particle size resulted in increased shear thickening performance and its onset whilst altering the carrier fluid chemistry has a significant effect on the thickening performance. An explanation is provided connecting the effect of varying particle size, carrier fluid chemistry and weight fraction to the resultant rheological behavior of the STFs. Two STFs were chosen for further testing due to their improved but contrasting rheological behaviors. Both STFs displayed a relationship between steady and dynamic shear conditions via the Modified Cox-Merz rule at high strain amplitudes ( ). Understanding the effects of particle and liquid polymer chemistry on the shear thickening effect will assist in ‘tailoring’ STFs for certain potential or existing applications.
Gang Rou Peng,Weihua Li,Tongfei Tian,Jie Ding,Masami Nakano 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.2
Nowadays, both Magneto-rheological Fluid (MRF) and Shear Thickening Fluid (STF) have separatelyattracted considerable interest due to the fast reversible response to either external magnetic field or abruptshearing loading. In this paper, we fabricated a combined phase of Magneto-rheological Shear ThickeningFluid (MRSTF), where the 25 wt% STF is applied as medium phase with the addition of varied fractionsof iron particle. The investigation of the dynamic behavior of this novel material under oscillatory shear waslaunched in a parallel-plate rheometer. The relevance of the dynamic behavior to strain amplitude,frequency and external magnetic field were investigated and discussed. A four-parameter viscoelastic modelwas applied to reconstruct the mechanical behavior of the MRSTF under different working conditions, andthe parameters were identified within the Matlab optimization algorithm. The comparison between theexperimental data and the model prediction results indicated that the four-parameter model could predictviscoelastic material with desired accuracy. The MRSTF exhibits features of both components, while pronemore to MRF with the inception of external field excitations.
Weiyan Liu,Huiming Ji,Jian Wang,Xuerong Zheng,Junyun Lai,Junna Ji,Tongfei Li,Yuanliang Ma,Haiqin Li,Suqin Zhao,Zhengguo Jin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
"Uniform hexagonal covellite CuS thin films were deposited at room temperature by an in situ solution chemical reaction using copper precursor solid films as cationic source and ammonium sulfide ethanol solution as anionic reaction medium. We investigated the influence of both ethanolamine and butanol contents used in copper nitrate/ethylene glycol monomethylether (EGME) cationic solution for the preparation of copper precursor solid films, deposition cycle numbers and annealing treatment of the as-grown thin films by X-ray diffraction (XRD), FESEM, energy dispersive X-ray fluorescence EDX, transmission electron microscopy–Selected area electronic diffraction (TEM–SAED), atomic force microscopy (AFM) and ultraviolet-visible-near-infrared (UV-Vis–NIR) measurements. Photo-response of the CuS thin films was characterized by linear sweep voltammetry. The deposited CuS thin films were used to sensitize TiO2 anodes for solar cell application. The results showed that the CuS films had two-dimension oriented, half-sheet shaped growing morphology standing disorderly but vertically to substrates, and the calculated texture coefficient TC(102) verified that the half-sheet shaped crystallites had (102) plane orientation. This in situ multi-deposition process had an average deposited rate of 9 nm per cycle, and a selfperfect function to grow smooth, uniform and 2D oriented morphology with increase in the dip-cycle numbers. The photocurrent density was 14.5 Ma/cm2 at 1 V versus Ag/AgCl electrode for the annealed CuS thin films. CuS-sensitized TiO2 solar cells had a maximum conversion efficiency of 0.224%."