Effects of dispersants on dispersibility of titanium carbide aqueous suspension

Foratirad, Hamze; Baharvandi, Hamid Reza; Maragheh, Mohammad Ghannadi

doi:10.1016/j.ijrmhm.2015.12.007

Cited by 18 publications

(10 citation statements)

References 30 publications

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“…At present, a large number of studies have focused on achieving good dispersion of silicon carbide powder into water, and the commonly used dispersants are mainly small molecules and polyelectrolytes, such as tetramethylammonium hydroxide (TMAH) and polyethyleneimine (PEI) [19][20][21][22][23][24][25][26][27][28][29][30]. For our own research, tape casting is used to obtain dense SiC ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…For our own research, tape casting is used to obtain dense SiC ceramics. In terms of solvent options, we chose ethanol as the solvent because, to date, it is difficult to find a suitable binder that can be efficiently dissolved into water; additionally, the colloidal process usually requires the addition of a variety of polymers, which are prone to produce complex effects in water, and we lack certain knowledge about what those interactions are [19][20][21][22][23][24][25][28][29][30][31][32]. Unfortunately, most of these studies were performed in deionized water.…”

Section: Introductionmentioning

confidence: 99%

“…PEI is an effective dispersant in a low pH suspension. The stability mechanism of PEI in suspension is a combination of steric hindrance and surface charge repulsion mechanisms that has been successfully applied to stabilize different ceramic suspensions [19][20][21][22][23][24]. The ability of PEI to acquire hydrogen ions was affected by the pH value; the protonation (~0.1%) of PEI almost occurred at pH 10, and it was completely protonated at pH 2.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In order to compare the various dispersants, Tetramethylammonium hydroxide (TMAH, C 4 H 13 NO, Merck Co.) and Polyethylene imine (PEI, (C 2 H 5 N) n , Merck Co.) were used as the dispersants. The quantity of dispersants applied with respect to the previous studies 14 , were selected at the 0.4 and 2wt% of the ceramic powder, respectively. The gelcasting flow chart presented in Figure 2 shows the process of producing the final products from the titanium carbide powder.…”

Section: Methodsmentioning

confidence: 99%

Chemo-Rheological Behavior of Aqueous Titanium Carbide Suspension and Evaluation of the Gelcasted Green Body Properties

2016

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Gel-casting is an advanced colloidal processing method for fabricating ceramic green parts. In this project acrylamide-based monomers were used as a gelcasting system. The effects of tetramethylammonium hydroxide and polyethylenimine dispersants on the premix solution containing titanium carbide powder have been studied via observation of the zeta potential and rheological behavior. The effect of various parameters on the gelation time and viscosity of solution and flexural strength and the shrinkage rate of titanium carbide green body were investigated. The results presented that the order of dispersion capacity of the tetramethylammonium hydroxide dispersant was better than the polyethylenimine dispersants. The results showed that the gelation time decreased and viscosity increased with increasing the monomer content, solid loading, initiator amount and temperature. The highest bending strength (39 MPa) was obtained for the samples containing 25 wt.% monomer content and 50% solid loading.

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“…The zeta potential is a measure for the expected stability of the suspension. 34 A high absolute value of zeta potential indicates improved stability in the suspension. 35 In this study, the effects of pH, reaction time, and SeMNPV concentration on the zeta potential of the suspension were studied to optimize the preparation technology of P-N microcapsules (Figs 1-3).…”

Section: Optimization Of P-n Microcapsulesmentioning

confidence: 99%

Surface modification of nucleopolyhedrovirus with polydopamine to improve its properties

Yan

Wang

et al. 2021

Pest Management Science

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BACKGROUND: Baculoviruses have been developed as promising biopesticides to control pests due to their high host specificity and virulence, and nontoxicity to humans and nontarget animals. However, their sensitivity to ultraviolet (UV) radiation and instability in the natural environment are major constraints to its large-scale application. In this study, polydopaminenucleopolyhedrovirus microcapsules were established to improve the instability of baculoviruses in sunlight. RESULTS:The optimal conditions for the preparation of polydopamine-nucleopolyhedrovirus microcapsules were as follows: Spodoptera exigua nucleopolyhedrovirus (SeMNPV)concentration of 2 × 10 8 polyhedral inclusion body(PIB) mL -1 , reaction time of 6 h, and pH of 9.0. The particle size of the obtained microcapsules was about 1 ∼m. The microencapsulated baculovirus improved its thermal stability and wettability, and enhanced its insecticidal activity against Spodoptera exigua. Moreover, under the same UV treatment, the insecticidal effect against S. exigua larvae of microencapsulated baculovirus was only reduced by 8.89%, whereas that of the nonmicroencapsulated baculovirus was reduced by 27.27%. CONCLUSION: Polydopamine-nucleopolyhedrovirus microcapsules provided better UV resistance and preparation stability compared with unmodified SeMNPV, and demonstrate an idea for the development of a baculovirus-based stabilized product.

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Effects of dispersants on dispersibility of titanium carbide aqueous suspension

Cited by 18 publications

References 30 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

Chemo-Rheological Behavior of Aqueous Titanium Carbide Suspension and Evaluation of the Gelcasted Green Body Properties

Surface modification of nucleopolyhedrovirus with polydopamine to improve its properties

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