The effect of sol-gel process on the microstructure and particle size of ZrC–SiC composite powders

Tong, Kun; Zhang, Mingyu; Huang, Qizhong; Su, Zhean; Yang, Cheng; Wang, Xiaodong; Wang, Yafeng; Song, Weijie

doi:10.1016/j.ceramint.2019.10.273

Cited by 28 publications

(9 citation statements)

References 39 publications

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“…In relation to S3 prepared by hydrothermal method, silica nanoparticles were obtained under specific conditions including reaction temperature, pH value, solution concentration, ageing time and pressure [ 34 , 35 , 36 – 34 , 35 , 36 ]. According to a previous work [ 37 ], the reaction temperature and time possess great effects on the size of the produced particles along with the agglomeration between the synthesised particles. Therefore, decreasing the reaction temperature may lead to a decrease in the particle size as well as the agglomeration between MSNs, which explains the presence of particles with lower size.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous silica nanoparticles prepared by different methods for biomedical applications: Comparative study

Ashour

Mabrouk

Soliman

et al. 2021

IET Nanobiotechnology

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In the current investigation, mesoporous silica nanoparticles were obtained by various techniques, namely sol-gel (S1), micro-emulsion (S2) and hydrothermal synthesis (S3). The effect of those methods on the final features of the obtained mesoporous silica nanoparticles was studied. The obtained nanoparticles were investigated by TEM, BET surface area, Zetasizer, XRD and FTIR. The preparation method effect was evaluated on the drug release behaviour using doxycycline hyclate as a model drug. In addition, the degree of their compatibility against Saos-2 cell line was also determined. The morphology and microstructure of silica nanoparticles were found to be dependent on the utilised method. Those techniques produced particles with particle sizes of 50, 30-20 and 15 nm and also surface areas of 111.04, 164 and 538.72 m 2 /g, respectively, for S1, S2 and S3. However, different preparation methods showed no remarkable changes for the physical and chemical integrities. The drug release test showed faster release from S2 compared with S1 and S3, which make them more applicable in cases require large doses for short periods. However, the release behaviour of S3 was satisfied for treatments which require long period with relatively highest release rate. The preparation method influenced the cell viability as S1 and S2 showed acceptable cell cytotoxicity compared with S3.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Resultsmentioning

confidence: 99%

Mesoporous silica nanoparticles prepared by different methods for biomedical applications: Comparative study

Ashour

Mabrouk

Soliman

et al. 2021

IET Nanobiotechnology

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“…Figure 2D shows that modified SiC slurry achieves the lowest viscosity at 90°C and 2 h. High temperature favored the ionization of PSS and the adsorption of negatively charged PSS chains on the SiC surface. When the temperature was above 90°C, the strengthening of Brownian motion brought about the intensification of collision and agglomeration among SiC particles, which kept PSS chains from being adsorbed on the SiC surface 39,40 . Moreover, modified SiC slurry had the lowest viscosity at 2 h, and thereafter viscosity barely changed with time prolonging, indicating that the adsorption of PSS on SiC surface reached the saturation within 2 h.…”

Section: Resultsmentioning

confidence: 99%

“…When the temperature was above 90 • C, the strengthening of Brownian motion brought about the intensification of collision and agglomeration among SiC particles, which kept PSS chains from being adsorbed on the SiC surface. 39,40 Moreover, modified SiC slurry had the lowest viscosity at 2 h, and thereafter viscosity barely changed with time prolonging, indicating that the adsorption of PSS on SiC surface reached the saturation within 2 h.…”

Section: Effects Of Modification Process On the Viscositymentioning

confidence: 96%

Adsorption of anionic polyelectrolyte on an SiC surface and effects on dispersion stability

Zhang

Niu

et al. 2022

J Am Ceram Soc.

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Aluminum nitrate (Al(NO3)3) and sodium polystyrene sulfonate (PSS) were used to improve the dispersion of fine silicon carbide (SiC) powders. Effects of modification parameters on the viscosity of modified SiC slurry were studied by orthogonal experiments. Modified SiC slurry with the solid loading of 50 vol% reached the lowest viscosity of 34 MPa s. The adsorption processes of PSS on the as‐received and Al(NO3)3 premodified SiC surface were investigated. The results indicated that the adsorption between PSS and premodified SiC surfaces was a high affinity type and was mainly controlled by active sites on an SiC surface. The Langmuir model and the pseudo‐second‐order model could better fit the adsorption isotherm and kinetics data, respectively. The contact angle decreased from 32.8 to 15.2° and the wettability was improved by modification. The isoelectric point of modified SiC powder shifted to the acidic region and the maximum zeta potential was obtained at pH 11. Sedimentation results also showed that a stable dispersed suspension of modified SiC was achieved at pH 11. Density–pressure curves demonstrated that the flowability and formability of SiC powder were improved by modification. The dispersion effect of PSS on SiC and Al2O3 composite powder was verified by viscosity and sedimentation results.

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“…Therefore, homogeneously mixed and non-agglomerated SiC and ZrC powder raw materials need to be synthesised to prepare SiC-ZrC composites with excellent properties. At present, the synthesis methods of SiC-ZrC composite powders mainly include the carbothermal reduction method [13][14][15][16], sol-gel method [17][18][19], and liquid precursor method [4,[20][21]. In the current industrial production, the carbothermal reduction method is used as the main method for synthesising various carbide powders due to its simple synthesis process, simple equipment needed, low preparation cost, and stable product quality [22][23].…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS AND MECHANISM OF SiC-ZrC COMPOSITE POWDERS BY CARBOTHERMAL REDUCTION METHOD

Cao¹

2022

Ceramics - Silikaty

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SiC-ZrC composite powders were synthesised by the carbothermal reduction method using starch as the carbon source, zirconium dioxide as the zirconium source, and silica sol as the silicon source. The effects of the reaction temperature on the phase composition and microstructure of the SiC-ZrC composite powders were investigated. The reaction process was thermodynamically analysed and calculated, and the synthesis mechanism of the SiC-ZrC composite powder was analysed. The synthesised powder samples were characterised and analysed by X-ray diffraction, scanning electron microscopy, and other testing methods. The results show that the optimum reaction condition for the synthesis of SiC-ZrC composite powders is at 1550 °C-1600 °C for 1.5 h. A high temperature and a low pressure are beneficial in conducting the synthesis reaction. The SiC-ZrC composite powders synthesised by calcining at 1550 °C and holding for 1.5 h are mainly composed of a certain amount of whiskers, spherical particles, floc particles, and other structures. Moreover, their grain size is small (100-200 nm). The powder samples synthesised at 1600 °C produced a larger number of whiskers. The length of the whiskers was mostly 10 μm, the arrangement was complex and irregular, and a diverse microstructure was formed.

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The effect of sol-gel process on the microstructure and particle size of ZrC–SiC composite powders

Cited by 28 publications

References 39 publications

Mesoporous silica nanoparticles prepared by different methods for biomedical applications: Comparative study

Mesoporous silica nanoparticles prepared by different methods for biomedical applications: Comparative study

Adsorption of anionic polyelectrolyte on an SiC surface and effects on dispersion stability

SYNTHESIS AND MECHANISM OF SiC-ZrC COMPOSITE POWDERS BY CARBOTHERMAL REDUCTION METHOD

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