Effect of surface modification and medium on the rheological properties of silica nanoparticle suspensions

Li, Shuangbing; Wang, Jixiao; Zhao, Song; Cai, Wei; Wang, Zhi; Wang, Shichang

doi:10.1016/j.ceramint.2016.01.199

Cited by 18 publications

(11 citation statements)

References 41 publications

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“…Figure 9c shows the Si 2p spectra of PVP-modified SiC particles. From Figure 9c above, we can see that the two peaks at 103.18 eV and 104.38 eV were related to Si-C and Si-O, respectively [49]. The existence of Si-OH confirmed the presence of an active site for the adsorption of PVP on the surface of silicon carbide, and hydrogen bonds could be formed between the surface of the SiC and PVP molecules.…”

Section: Ftir and Xps Characterizationmentioning

confidence: 77%

“…Figure 7 shows the interaction between SiC and PVP by FTIR spectroscopy. The infrared absorption band of SiC in Figure 7 had peak values of 3430, 1630, 943, and 835 cm −1 , which were caused by OH stretching, OH stretching from water vapor by physical adsorption, Si-O-Si, and Si-C stretching vibration, respectively [45,46,49]. IR absorptions of SiC with adsorbed PVP primarily occurred at 3430, 1660-1289, and 835 cm −1 .…”

Section: Ftir and Xps Characterizationmentioning

confidence: 99%

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Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants

Luo

Zhang

et al. 2020

Materials

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A colloidal stability study of a nonaqueous silicon carbide suspension is of great significance for preparing special silicon carbide ceramics by colloidal processing. In this paper, three different chemical dispersants, which are amphiphilic, acidophilic, and alkaliphilic, are selected to compare their ability to stabilize nonaqueous slurries of silicon carbide. The analysis of the flow index factor is first used to estimate the colloidal stability of the suspensions. The results show that the addition of only 5 wt.% polyvinylpyrrolidone (PVP) forms a silicon carbide slurry with a low viscosity value of 17 mPa⋅s at 25 s−1. In addition, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)measurements indicate that the PVP molecule is successfully adsorbed on the surface of silicon carbide. The different adsorption models are fitted, and the adsorption of PVP molecules on the surface of silicon carbide belongs to the Langmuir single-layer adsorption model. At the optimal PVP amount, the volume content of the suspension is as high as 22.27 vol.%, a Newtonian-like fluid still appears, and no agglomerate structure is formed in the system. After the volume content exceeds 22.27 vol.%, the flow index factor of the slurry begins to plummet, indicating that the slurry begins to transform from a Newtonian-like fluid to a shear-thinning fluid. The particles undergo inevitable agglomeration accompanied by the emergence of yield stress. Finally, a maximum solid loading of the system is predicted to be 46 vol.%, using the Krieger-Dougherty model.

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Section: Ftir and Xps Characterizationmentioning

confidence: 77%

Section: Ftir and Xps Characterizationmentioning

confidence: 99%

Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants

Luo

Zhang

et al. 2020

Materials

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“…Li et al reported that the surface modication of silica particles with 3-(trimethoxy silyl)propyl methacrylate (TPM) decreased the viscosity of the STF due to a decrease in the interactions of particles. 29 Mahfuz et al functionalized silica particles with amino propyl triethoxy silane and prepared STFs by dispersing silica particles into a mixture of PEG and ethanol through a sonic cavitation process and applied it on a Kevlar fabric. 13 The performance of the resulting armor composites improved signicantly as compared to that of the neat fabric.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of silica particles to tune the impact resistance of shear thickening fluid treated aramid fabrics

et al. 2017

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“…Silica nanoparticles (SiO 2 NPs) were synthesized using the Stöber method. A mixture of 11 mL of ammonia and 130 mL of extra pure ethanol was heated to 60 °C in a 300 mL three-neck round flask equipped with a reflux condenser and a magnetic stirrer . After 60 min equilibration time, a preheated solution of TEOS (5 mL) in ethanol (15 mL) was rapidly added.…”

Section: Methodsmentioning

confidence: 99%

Effect of Core Nanostructure on the Thermomechanical Properties of Soft Nanoparticles

et al. 2019

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The mechanical properties of nanoparticles, especially those designed for biomedical purposes, have a large impact on their performance and have been scarcely studied. Thermoresponsive polymer-based nanoparticles are increasingly being used in biomedical applications; therefore, it is crucial to determine their thermomechanical response in the regime beyond their volume phase transition temperature (VPTT). The morphological characterization and comparison of thermoresponsive nanogels (NGs), silica core nanogels (SiO2@NGs), and nanocapsules (NCs) in liquids, both below and above the VPTT, are explored in this study. We employed atomic force microscopy in Peak Force QNM mode as well as dynamic light scattering, nanoparticle tracking analysis, and cryogenic electron microscopy (cryo-TEM). Surprisingly, nanocapsules presented increased resistance to deformation, when compared to nanogels, above the VPTT. This was attributed to differences in the cross-link density radial distribution between nanogels and nanocapsules derived from the synthetic approach employed. In addition, the Young’s modulus was calculated from nanoindentations and by computer simulations, showing a significant change in NCs upon crossing the VPTT from MPa to GPa. Conversely, NGs displayed a Young’s modulus in the kPa range, both below and above the VPTT. The findings of this study show that structural design and thermoresponsivity strongly influence the thermomechanical properties of nanoparticles. This in turn needs to be taken into consideration in the design of future nanocarriers.

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Effect of surface modification and medium on the rheological properties of silica nanoparticle suspensions

Cited by 18 publications

References 41 publications

Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants

Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants

Functionalization of silica particles to tune the impact resistance of shear thickening fluid treated aramid fabrics

Effect of Core Nanostructure on the Thermomechanical Properties of Soft Nanoparticles

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